ri_triggers.c File Reference

#include "postgres.h"
#include "access/amapi.h"
#include "access/genam.h"
#include "access/htup_details.h"
#include "access/skey.h"
#include "access/sysattr.h"
#include "access/table.h"
#include "access/tableam.h"
#include "access/xact.h"
#include "catalog/index.h"
#include "catalog/pg_collation.h"
#include "catalog/pg_constraint.h"
#include "catalog/pg_namespace.h"
#include "commands/trigger.h"
#include "executor/executor.h"
#include "executor/spi.h"
#include "lib/ilist.h"
#include "miscadmin.h"
#include "parser/parse_coerce.h"
#include "parser/parse_relation.h"
#include "utils/acl.h"
#include "utils/builtins.h"
#include "utils/datum.h"
#include "utils/fmgroids.h"
#include "utils/guc.h"
#include "utils/hsearch.h"
#include "utils/inval.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "utils/rel.h"
#include "utils/rls.h"
#include "utils/ruleutils.h"
#include "utils/snapmgr.h"
#include "utils/syscache.h"

Include dependency graph for ri_triggers.c:

Go to the source code of this file.

Data Structures
struct	RI_ConstraintInfo
struct	FastPathMeta
struct	RI_QueryKey
struct	RI_QueryHashEntry
struct	RI_CompareKey
struct	RI_CompareHashEntry
struct	RI_FastPathEntry

Macros
#define	RI_MAX_NUMKEYS   INDEX_MAX_KEYS
#define	RI_INIT_CONSTRAINTHASHSIZE   64
#define	RI_INIT_QUERYHASHSIZE   (RI_INIT_CONSTRAINTHASHSIZE * 4)
#define	RI_KEYS_ALL_NULL   0
#define	RI_KEYS_SOME_NULL   1
#define	RI_KEYS_NONE_NULL   2
#define	RI_PLAN_CHECK_LOOKUPPK   1
#define	RI_PLAN_CHECK_LOOKUPPK_FROM_PK   2
#define	RI_PLAN_LAST_ON_PK   RI_PLAN_CHECK_LOOKUPPK_FROM_PK
#define	RI_PLAN_CASCADE_ONDELETE   3
#define	RI_PLAN_CASCADE_ONUPDATE   4
#define	RI_PLAN_NO_ACTION   5
#define	RI_PLAN_RESTRICT   6
#define	RI_PLAN_SETNULL_ONDELETE   7
#define	RI_PLAN_SETNULL_ONUPDATE   8
#define	RI_PLAN_SETDEFAULT_ONDELETE   9
#define	RI_PLAN_SETDEFAULT_ONUPDATE   10
#define	MAX_QUOTED_NAME_LEN   (NAMEDATALEN*2+3)
#define	MAX_QUOTED_REL_NAME_LEN   (MAX_QUOTED_NAME_LEN*2)
#define	RIAttName(rel, attnum)   NameStr(*attnumAttName(rel, attnum))
#define	RIAttType(rel, attnum)   attnumTypeId(rel, attnum)
#define	RIAttCollation(rel, attnum)   attnumCollationId(rel, attnum)
#define	RI_TRIGTYPE_INSERT   1
#define	RI_TRIGTYPE_UPDATE   2
#define	RI_TRIGTYPE_DELETE   3
#define	RI_FASTPATH_BATCH_SIZE   64

Typedefs
typedef struct FastPathMeta	FastPathMeta
typedef struct RI_ConstraintInfo	RI_ConstraintInfo
typedef struct RI_CompareHashEntry	RI_CompareHashEntry
typedef struct RI_QueryKey	RI_QueryKey
typedef struct RI_QueryHashEntry	RI_QueryHashEntry
typedef struct RI_CompareKey	RI_CompareKey
typedef struct RI_FastPathEntry	RI_FastPathEntry

Functions
static bool	ri_Check_Pk_Match (Relation pk_rel, Relation fk_rel, TupleTableSlot *oldslot, const RI_ConstraintInfo *riinfo)
static Datum	ri_restrict (TriggerData *trigdata, bool is_no_action)
static Datum	ri_set (TriggerData *trigdata, bool is_set_null, int tgkind)
static void	quoteOneName (char *buffer, const char *name)
static void	quoteRelationName (char *buffer, Relation rel)
static void	ri_GenerateQual (StringInfo buf, const char *sep, const char *leftop, Oid leftoptype, Oid opoid, const char *rightop, Oid rightoptype)
static void	ri_GenerateQualCollation (StringInfo buf, Oid collation)
static int	ri_NullCheck (TupleDesc tupDesc, TupleTableSlot *slot, const RI_ConstraintInfo *riinfo, bool rel_is_pk)
static void	ri_BuildQueryKey (RI_QueryKey *key, const RI_ConstraintInfo *riinfo, int32 constr_queryno)
static bool	ri_KeysEqual (Relation rel, TupleTableSlot *oldslot, TupleTableSlot *newslot, const RI_ConstraintInfo *riinfo, bool rel_is_pk)
static bool	ri_CompareWithCast (Oid eq_opr, Oid typeid, Oid collid, Datum lhs, Datum rhs)
static void	ri_InitHashTables (void)
static void	InvalidateConstraintCacheCallBack (Datum arg, SysCacheIdentifier cacheid, uint32 hashvalue)
static SPIPlanPtr	ri_FetchPreparedPlan (RI_QueryKey *key)
static void	ri_HashPreparedPlan (RI_QueryKey *key, SPIPlanPtr plan)
static RI_CompareHashEntry *	ri_HashCompareOp (Oid eq_opr, Oid typeid)
static void	ri_CheckTrigger (FunctionCallInfo fcinfo, const char *funcname, int tgkind)
static const RI_ConstraintInfo *	ri_FetchConstraintInfo (Trigger *trigger, Relation trig_rel, bool rel_is_pk)
static const RI_ConstraintInfo *	ri_LoadConstraintInfo (Oid constraintOid)
static Oid	get_ri_constraint_root (Oid constrOid)
static SPIPlanPtr	ri_PlanCheck (const char *querystr, int nargs, Oid *argtypes, RI_QueryKey *qkey, Relation fk_rel, Relation pk_rel)
static bool	ri_PerformCheck (const RI_ConstraintInfo *riinfo, RI_QueryKey *qkey, SPIPlanPtr qplan, Relation fk_rel, Relation pk_rel, TupleTableSlot *oldslot, TupleTableSlot *newslot, bool is_restrict, bool detectNewRows, int expect_OK)
static void	ri_FastPathCheck (const RI_ConstraintInfo *riinfo, Relation fk_rel, TupleTableSlot *newslot)
static void	ri_FastPathBatchAdd (const RI_ConstraintInfo *riinfo, Relation fk_rel, TupleTableSlot *newslot)
static void	ri_FastPathBatchFlush (RI_FastPathEntry *fpentry, Relation fk_rel, const RI_ConstraintInfo *riinfo)
static int	ri_FastPathFlushArray (RI_FastPathEntry *fpentry, TupleTableSlot *fk_slot, const RI_ConstraintInfo *riinfo, Relation fk_rel, Snapshot snapshot, IndexScanDesc scandesc)
static int	ri_FastPathFlushLoop (RI_FastPathEntry *fpentry, TupleTableSlot *fk_slot, const RI_ConstraintInfo *riinfo, Relation fk_rel, Snapshot snapshot, IndexScanDesc scandesc)
static bool	ri_FastPathProbeOne (Relation pk_rel, Relation idx_rel, IndexScanDesc scandesc, TupleTableSlot *slot, Snapshot snapshot, const RI_ConstraintInfo *riinfo, ScanKeyData *skey, int nkeys)
static bool	ri_LockPKTuple (Relation pk_rel, TupleTableSlot *slot, Snapshot snap, bool *concurrently_updated)
static bool	ri_fastpath_is_applicable (const RI_ConstraintInfo *riinfo)
static void	ri_CheckPermissions (Relation query_rel)
static bool	recheck_matched_pk_tuple (Relation idxrel, ScanKeyData *skeys, int nkeys, TupleTableSlot *new_slot)
static void	build_index_scankeys (const RI_ConstraintInfo *riinfo, Relation idx_rel, Datum *pk_vals, char *pk_nulls, ScanKey skeys)
static void	ri_populate_fastpath_metadata (RI_ConstraintInfo *riinfo, Relation fk_rel, Relation idx_rel)
static void	ri_ExtractValues (Relation rel, TupleTableSlot *slot, const RI_ConstraintInfo *riinfo, bool rel_is_pk, Datum *vals, char *nulls)
static pg_noreturn void	ri_ReportViolation (const RI_ConstraintInfo *riinfo, Relation pk_rel, Relation fk_rel, TupleTableSlot *violatorslot, TupleDesc tupdesc, int queryno, bool is_restrict, bool partgone)
static RI_FastPathEntry *	ri_FastPathGetEntry (const RI_ConstraintInfo *riinfo, Relation fk_rel)
static void	ri_FastPathEndBatch (void *arg)
static void	ri_FastPathTeardown (void)
static Datum	RI_FKey_check (TriggerData *trigdata)
Datum	RI_FKey_check_ins (PG_FUNCTION_ARGS)
Datum	RI_FKey_check_upd (PG_FUNCTION_ARGS)
Datum	RI_FKey_noaction_del (PG_FUNCTION_ARGS)
Datum	RI_FKey_restrict_del (PG_FUNCTION_ARGS)
Datum	RI_FKey_noaction_upd (PG_FUNCTION_ARGS)
Datum	RI_FKey_restrict_upd (PG_FUNCTION_ARGS)
Datum	RI_FKey_cascade_del (PG_FUNCTION_ARGS)
Datum	RI_FKey_cascade_upd (PG_FUNCTION_ARGS)
Datum	RI_FKey_setnull_del (PG_FUNCTION_ARGS)
Datum	RI_FKey_setnull_upd (PG_FUNCTION_ARGS)
Datum	RI_FKey_setdefault_del (PG_FUNCTION_ARGS)
Datum	RI_FKey_setdefault_upd (PG_FUNCTION_ARGS)
bool	RI_FKey_pk_upd_check_required (Trigger *trigger, Relation pk_rel, TupleTableSlot *oldslot, TupleTableSlot *newslot)
bool	RI_FKey_fk_upd_check_required (Trigger *trigger, Relation fk_rel, TupleTableSlot *oldslot, TupleTableSlot *newslot)
bool	RI_Initial_Check (Trigger *trigger, Relation fk_rel, Relation pk_rel)
void	RI_PartitionRemove_Check (Trigger *trigger, Relation fk_rel, Relation pk_rel)
int	RI_FKey_trigger_type (Oid tgfoid)
static void	ri_FastPathXactCallback (XactEvent event, void *arg)
static void	ri_FastPathSubXactCallback (SubXactEvent event, SubTransactionId mySubid, SubTransactionId parentSubid, void *arg)

Variables
static HTAB *	ri_constraint_cache = NULL
static HTAB *	ri_query_cache = NULL
static HTAB *	ri_compare_cache = NULL
static dclist_head	ri_constraint_cache_valid_list
static HTAB *	ri_fastpath_cache = NULL
static bool	ri_fastpath_callback_registered = false
static bool	ri_fastpath_xact_callback_registered = false

Macro Definition Documentation

MAX_QUOTED_NAME_LEN

#define MAX_QUOTED_NAME_LEN   (NAMEDATALEN*2+3)

Definition at line 89 of file ri_triggers.c.

MAX_QUOTED_REL_NAME_LEN

#define MAX_QUOTED_REL_NAME_LEN   (MAX_QUOTED_NAME_LEN*2)

Definition at line 90 of file ri_triggers.c.

RI_FASTPATH_BATCH_SIZE

#define RI_FASTPATH_BATCH_SIZE   64

Definition at line 213 of file ri_triggers.c.

RI_INIT_CONSTRAINTHASHSIZE

#define RI_INIT_CONSTRAINTHASHSIZE   64

Definition at line 66 of file ri_triggers.c.

RI_INIT_QUERYHASHSIZE

#define RI_INIT_QUERYHASHSIZE   (RI_INIT_CONSTRAINTHASHSIZE * 4)

Definition at line 67 of file ri_triggers.c.

RI_KEYS_ALL_NULL

#define RI_KEYS_ALL_NULL   0

Definition at line 69 of file ri_triggers.c.

RI_KEYS_NONE_NULL

#define RI_KEYS_NONE_NULL   2

Definition at line 71 of file ri_triggers.c.

RI_KEYS_SOME_NULL

#define RI_KEYS_SOME_NULL   1

Definition at line 70 of file ri_triggers.c.

RI_MAX_NUMKEYS

#define RI_MAX_NUMKEYS   INDEX_MAX_KEYS

Definition at line 64 of file ri_triggers.c.

RI_PLAN_CASCADE_ONDELETE

#define RI_PLAN_CASCADE_ONDELETE   3

Definition at line 79 of file ri_triggers.c.

RI_PLAN_CASCADE_ONUPDATE

#define RI_PLAN_CASCADE_ONUPDATE   4

Definition at line 80 of file ri_triggers.c.

RI_PLAN_CHECK_LOOKUPPK

#define RI_PLAN_CHECK_LOOKUPPK   1

Definition at line 75 of file ri_triggers.c.

RI_PLAN_CHECK_LOOKUPPK_FROM_PK

#define RI_PLAN_CHECK_LOOKUPPK_FROM_PK   2

Definition at line 76 of file ri_triggers.c.

RI_PLAN_LAST_ON_PK

#define RI_PLAN_LAST_ON_PK   RI_PLAN_CHECK_LOOKUPPK_FROM_PK

Definition at line 77 of file ri_triggers.c.

RI_PLAN_NO_ACTION

#define RI_PLAN_NO_ACTION   5

Definition at line 81 of file ri_triggers.c.

RI_PLAN_RESTRICT

#define RI_PLAN_RESTRICT   6

Definition at line 83 of file ri_triggers.c.

RI_PLAN_SETDEFAULT_ONDELETE

#define RI_PLAN_SETDEFAULT_ONDELETE   9

Definition at line 86 of file ri_triggers.c.

RI_PLAN_SETDEFAULT_ONUPDATE

#define RI_PLAN_SETDEFAULT_ONUPDATE   10

Definition at line 87 of file ri_triggers.c.

RI_PLAN_SETNULL_ONDELETE

#define RI_PLAN_SETNULL_ONDELETE   7

Definition at line 84 of file ri_triggers.c.

RI_PLAN_SETNULL_ONUPDATE

#define RI_PLAN_SETNULL_ONUPDATE   8

Definition at line 85 of file ri_triggers.c.

RI_TRIGTYPE_DELETE

#define RI_TRIGTYPE_DELETE   3

Definition at line 98 of file ri_triggers.c.

RI_TRIGTYPE_INSERT

#define RI_TRIGTYPE_INSERT   1

Definition at line 96 of file ri_triggers.c.

RI_TRIGTYPE_UPDATE

#define RI_TRIGTYPE_UPDATE   2

Definition at line 97 of file ri_triggers.c.

RIAttCollation

#define RIAttCollation	(		rel,
			attnum
	)		attnumCollationId(rel, attnum)

Definition at line 94 of file ri_triggers.c.

RIAttName

#define RIAttName	(		rel,
			attnum
	)		NameStr(*attnumAttName(rel, attnum))

Definition at line 92 of file ri_triggers.c.

RIAttType

#define RIAttType	(		rel,
			attnum
	)		attnumTypeId(rel, attnum)

Definition at line 93 of file ri_triggers.c.

Typedef Documentation

FastPathMeta

typedef struct FastPathMeta FastPathMeta

Definition at line 100 of file ri_triggers.c.

RI_CompareHashEntry

typedef struct RI_CompareHashEntry RI_CompareHashEntry

Definition at line 149 of file ri_triggers.c.

RI_CompareKey

typedef struct RI_CompareKey RI_CompareKey

RI_ConstraintInfo

typedef struct RI_ConstraintInfo RI_ConstraintInfo

RI_FastPathEntry

typedef struct RI_FastPathEntry RI_FastPathEntry

RI_QueryHashEntry

typedef struct RI_QueryHashEntry RI_QueryHashEntry

RI_QueryKey

typedef struct RI_QueryKey RI_QueryKey

Function Documentation

build_index_scankeys()

static void build_index_scankeys ( const RI_ConstraintInfo *  riinfo, Relation  idx_rel, Datum *  pk_vals, char *  pk_nulls, ScanKey  skeys  )

static

Definition at line 3393 of file ri_triggers.c.

{
    FastPathMeta *fpmeta = riinfo->fpmeta;
 
    Assert(fpmeta);
 
    /*
     * May need to cast each of the individual values of the foreign key to
     * the corresponding PK column's type if the equality operator demands it.
     */
    for (int i = 0; i < riinfo->nkeys; i++)
    {
        if (pk_nulls[i] != 'n' &&
            OidIsValid(fpmeta->cast_func_finfo[i].fn_oid))
            pk_vals[i] = FunctionCall3(&fpmeta->cast_func_finfo[i],
                                       pk_vals[i],
                                       Int32GetDatum(-1),   /* typmod */
                                       BoolGetDatum(false));    /* implicit coercion */
    }
 
    /*
     * Set up ScanKeys for the index scan. This is essentially how
     * ExecIndexBuildScanKeys() sets them up.
     */
    for (int i = 0; i < riinfo->nkeys; i++)
    {
        int         pkattrno = i + 1;
 
        ScanKeyEntryInitialize(&skeys[i], 0, pkattrno,
                               fpmeta->strats[i], fpmeta->subtypes[i],
                               idx_rel->rd_indcollation[i], fpmeta->regops[i],
                               pk_vals[i]);
    }
}

References Assert, BoolGetDatum(), FastPathMeta::cast_func_finfo, fb(), FmgrInfo::fn_oid, FunctionCall3, i, Int32GetDatum(), OidIsValid, RelationData::rd_indcollation, FastPathMeta::regops, ScanKeyEntryInitialize(), FastPathMeta::strats, and FastPathMeta::subtypes.

Referenced by ri_FastPathCheck(), and ri_FastPathFlushLoop().

get_ri_constraint_root()

static Oid get_ri_constraint_root ( Oid  constrOid )

static

Definition at line 2503 of file ri_triggers.c.

{
    for (;;)
    {
        HeapTuple   tuple;
        Oid         constrParentOid;
 
        tuple = SearchSysCache1(CONSTROID, ObjectIdGetDatum(constrOid));
        if (!HeapTupleIsValid(tuple))
            elog(ERROR, "cache lookup failed for constraint %u", constrOid);
        constrParentOid = ((Form_pg_constraint) GETSTRUCT(tuple))->conparentid;
        ReleaseSysCache(tuple);
        if (!OidIsValid(constrParentOid))
            break;              /* we reached the root constraint */
        constrOid = constrParentOid;
    }
    return constrOid;
}

References elog, ERROR, fb(), Form_pg_constraint, GETSTRUCT(), HeapTupleIsValid, ObjectIdGetDatum(), OidIsValid, ReleaseSysCache(), and SearchSysCache1().

Referenced by ri_LoadConstraintInfo().

InvalidateConstraintCacheCallBack()

static void InvalidateConstraintCacheCallBack ( Datum  arg, SysCacheIdentifier  cacheid, uint32  hashvalue  )

static

Definition at line 2537 of file ri_triggers.c.

{
    dlist_mutable_iter iter;
 
    Assert(ri_constraint_cache != NULL);
 
    /*
     * If the list of currently valid entries gets excessively large, we mark
     * them all invalid so we can empty the list.  This arrangement avoids
     * O(N^2) behavior in situations where a session touches many foreign keys
     * and also does many ALTER TABLEs, such as a restore from pg_dump.
     */
    if (dclist_count(&ri_constraint_cache_valid_list) > 1000)
        hashvalue = 0;          /* pretend it's a cache reset */
 
    dclist_foreach_modify(iter, &ri_constraint_cache_valid_list)
    {
        RI_ConstraintInfo *riinfo = dclist_container(RI_ConstraintInfo,
                                                     valid_link, iter.cur);
 
        /*
         * We must invalidate not only entries directly matching the given
         * hash value, but also child entries, in case the invalidation
         * affects a root constraint.
         */
        if (hashvalue == 0 ||
            riinfo->oidHashValue == hashvalue ||
            riinfo->rootHashValue == hashvalue)
        {
            riinfo->valid = false;
            if (riinfo->fpmeta)
            {
                pfree(riinfo->fpmeta);
                riinfo->fpmeta = NULL;
            }
            /* Remove invalidated entries from the list, too */
            dclist_delete_from(&ri_constraint_cache_valid_list, iter.cur);
        }
    }
}

References Assert, dlist_mutable_iter::cur, dclist_container, dclist_count(), dclist_delete_from(), dclist_foreach_modify, fb(), pfree(), ri_constraint_cache, and ri_constraint_cache_valid_list.

Referenced by ri_InitHashTables().

quoteOneName()

static void quoteOneName ( char *  buffer, const char *  name  )

static

Definition at line 2161 of file ri_triggers.c.

{
    /* Rather than trying to be smart, just always quote it. */
    *buffer++ = '"';
    while (*name)
    {
        if (*name == '"')
            *buffer++ = '"';
        *buffer++ = *name++;
    }
    *buffer++ = '"';
    *buffer = '\0';
}

References name.

Referenced by quoteRelationName(), ri_Check_Pk_Match(), RI_FKey_cascade_del(), RI_FKey_cascade_upd(), RI_FKey_check(), ri_GenerateQualCollation(), RI_Initial_Check(), RI_PartitionRemove_Check(), ri_restrict(), and ri_set().

quoteRelationName()

static void quoteRelationName ( char *  buffer, Relation  rel  )

static

Definition at line 2181 of file ri_triggers.c.

{
    quoteOneName(buffer, get_namespace_name(RelationGetNamespace(rel)));
    buffer += strlen(buffer);
    *buffer++ = '.';
    quoteOneName(buffer, RelationGetRelationName(rel));
}

References fb(), get_namespace_name(), quoteOneName(), RelationGetNamespace, and RelationGetRelationName.

Referenced by ri_Check_Pk_Match(), RI_FKey_cascade_del(), RI_FKey_cascade_upd(), RI_FKey_check(), RI_Initial_Check(), RI_PartitionRemove_Check(), ri_restrict(), and ri_set().

recheck_matched_pk_tuple()

static bool recheck_matched_pk_tuple ( Relation  idxrel, ScanKeyData *  skeys, int  nkeys, TupleTableSlot *  new_slot  )

static

Definition at line 3343 of file ri_triggers.c.

{
    /*
     * TODO: BuildIndexInfo does a syscache lookup + palloc on every call.
     * This only fires on the concurrent-update path (tmfd.traversed), which
     * should be rare, so the cost is acceptable for now.  If profiling shows
     * otherwise, cache the IndexInfo in FastPathMeta.
     */
    IndexInfo  *indexInfo = BuildIndexInfo(idxrel);
    Datum       values[INDEX_MAX_KEYS];
    bool        isnull[INDEX_MAX_KEYS];
    bool        matched = true;
 
    /* PK indexes never have these. */
    Assert(indexInfo->ii_Expressions == NIL &&
           indexInfo->ii_ExclusionOps == NULL);
 
    /* Form the index values and isnull flags given the table tuple. */
    Assert(nkeys == indexInfo->ii_NumIndexKeyAttrs);
    FormIndexDatum(indexInfo, new_slot, NULL, values, isnull);
    for (int i = 0; i < nkeys; i++)
    {
        ScanKeyData *skey = &skeys[i];
 
        /* A PK column can never be set to NULL. */
        Assert(!isnull[i]);
        if (!DatumGetBool(FunctionCall2Coll(&skey->sk_func,
                                            skey->sk_collation,
                                            values[i],
                                            skey->sk_argument)))
        {
            matched = false;
            break;
        }
    }
 
    return matched;
}

References Assert, BuildIndexInfo(), DatumGetBool(), fb(), FormIndexDatum(), FunctionCall2Coll(), i, IndexInfo::ii_ExclusionOps, IndexInfo::ii_Expressions, IndexInfo::ii_NumIndexKeyAttrs, INDEX_MAX_KEYS, NIL, and values.

Referenced by ri_FastPathFlushArray(), and ri_FastPathProbeOne().

ri_BuildQueryKey()

static void ri_BuildQueryKey ( RI_QueryKey *  key, const RI_ConstraintInfo *  riinfo, int32  constr_queryno  )

static

Definition at line 2266 of file ri_triggers.c.

{
    /*
     * Inherited constraints with a common ancestor can share ri_query_cache
     * entries for all query types except RI_PLAN_CHECK_LOOKUPPK_FROM_PK.
     * Except in that case, the query processes the other table involved in
     * the FK constraint (i.e., not the table on which the trigger has been
     * fired), and so it will be the same for all members of the inheritance
     * tree.  So we may use the root constraint's OID in the hash key, rather
     * than the constraint's own OID.  This avoids creating duplicate SPI
     * plans, saving lots of work and memory when there are many partitions
     * with similar FK constraints.
     *
     * (Note that we must still have a separate RI_ConstraintInfo for each
     * constraint, because partitions can have different column orders,
     * resulting in different pk_attnums[] or fk_attnums[] array contents.)
     *
     * We assume struct RI_QueryKey contains no padding bytes, else we'd need
     * to use memset to clear them.
     */
    if (constr_queryno != RI_PLAN_CHECK_LOOKUPPK_FROM_PK)
        key->constr_id = riinfo->constraint_root_id;
    else
        key->constr_id = riinfo->constraint_id;
    key->constr_queryno = constr_queryno;
}

References fb(), and RI_PLAN_CHECK_LOOKUPPK_FROM_PK.

Referenced by ri_Check_Pk_Match(), RI_FKey_cascade_del(), RI_FKey_cascade_upd(), RI_FKey_check(), ri_restrict(), and ri_set().

ri_Check_Pk_Match()

static bool ri_Check_Pk_Match ( Relation  pk_rel, Relation  fk_rel, TupleTableSlot *  oldslot, const RI_ConstraintInfo *  riinfo  )

static

Definition at line 641 of file ri_triggers.c.

{
    SPIPlanPtr  qplan;
    RI_QueryKey qkey;
    bool        result;
 
    /* Only called for non-null rows */
    Assert(ri_NullCheck(RelationGetDescr(pk_rel), oldslot, riinfo, true) == RI_KEYS_NONE_NULL);
 
    SPI_connect();
 
    /*
     * Fetch or prepare a saved plan for checking PK table with values coming
     * from a PK row
     */
    ri_BuildQueryKey(&qkey, riinfo, RI_PLAN_CHECK_LOOKUPPK_FROM_PK);
 
    if ((qplan = ri_FetchPreparedPlan(&qkey)) == NULL)
    {
        StringInfoData querybuf;
        char        pkrelname[MAX_QUOTED_REL_NAME_LEN];
        char        attname[MAX_QUOTED_NAME_LEN];
        char        paramname[16];
        const char *querysep;
        const char *pk_only;
        Oid         queryoids[RI_MAX_NUMKEYS];
 
        /* ----------
         * The query string built is
         *  SELECT 1 FROM [ONLY] <pktable> x WHERE pkatt1 = $1 [AND ...]
         *         FOR KEY SHARE OF x
         * The type id's for the $ parameters are those of the
         * PK attributes themselves.
         *
         * But for temporal FKs we need to make sure
         * the old PK's range is completely covered.
         * So we use this query instead:
         *  SELECT 1
         *  FROM    (
         *    SELECT pkperiodatt AS r
         *    FROM   [ONLY] pktable x
         *    WHERE  pkatt1 = $1 [AND ...]
         *    AND    pkperiodatt && $n
         *    FOR KEY SHARE OF x
         *  ) x1
         *  HAVING $n <@ range_agg(x1.r)
         * Note if FOR KEY SHARE ever allows GROUP BY and HAVING
         * we can make this a bit simpler.
         * ----------
         */
        initStringInfo(&querybuf);
        pk_only = pk_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ?
            "" : "ONLY ";
        quoteRelationName(pkrelname, pk_rel);
        if (riinfo->hasperiod)
        {
            quoteOneName(attname, RIAttName(pk_rel, riinfo->pk_attnums[riinfo->nkeys - 1]));
 
            appendStringInfo(&querybuf,
                             "SELECT 1 FROM (SELECT %s AS r FROM %s%s x",
                             attname, pk_only, pkrelname);
        }
        else
        {
            appendStringInfo(&querybuf, "SELECT 1 FROM %s%s x",
                             pk_only, pkrelname);
        }
        querysep = "WHERE";
        for (int i = 0; i < riinfo->nkeys; i++)
        {
            Oid         pk_type = RIAttType(pk_rel, riinfo->pk_attnums[i]);
 
            quoteOneName(attname,
                         RIAttName(pk_rel, riinfo->pk_attnums[i]));
            sprintf(paramname, "$%d", i + 1);
            ri_GenerateQual(&querybuf, querysep,
                            attname, pk_type,
                            riinfo->pp_eq_oprs[i],
                            paramname, pk_type);
            querysep = "AND";
            queryoids[i] = pk_type;
        }
        appendStringInfoString(&querybuf, " FOR KEY SHARE OF x");
        if (riinfo->hasperiod)
        {
            Oid         fk_type = RIAttType(fk_rel, riinfo->fk_attnums[riinfo->nkeys - 1]);
 
            appendStringInfoString(&querybuf, ") x1 HAVING ");
            sprintf(paramname, "$%d", riinfo->nkeys);
            ri_GenerateQual(&querybuf, "",
                            paramname, fk_type,
                            riinfo->agged_period_contained_by_oper,
                            "pg_catalog.range_agg", ANYMULTIRANGEOID);
            appendStringInfoString(&querybuf, "(x1.r)");
        }
 
        /* Prepare and save the plan */
        qplan = ri_PlanCheck(querybuf.data, riinfo->nkeys, queryoids,
                             &qkey, fk_rel, pk_rel);
    }
 
    /*
     * We have a plan now. Run it.
     */
    result = ri_PerformCheck(riinfo, &qkey, qplan,
                             fk_rel, pk_rel,
                             oldslot, NULL,
                             false,
                             true,  /* treat like update */
                             SPI_OK_SELECT);
 
    if (SPI_finish() != SPI_OK_FINISH)
        elog(ERROR, "SPI_finish failed");
 
    return result;
}

References appendStringInfo(), appendStringInfoString(), Assert, attname, elog, ERROR, fb(), i, initStringInfo(), MAX_QUOTED_NAME_LEN, MAX_QUOTED_REL_NAME_LEN, quoteOneName(), quoteRelationName(), RelationData::rd_rel, RelationGetDescr, result, ri_BuildQueryKey(), ri_FetchPreparedPlan(), ri_GenerateQual(), RI_KEYS_NONE_NULL, RI_MAX_NUMKEYS, ri_NullCheck(), ri_PerformCheck(), RI_PLAN_CHECK_LOOKUPPK_FROM_PK, ri_PlanCheck(), RIAttName, RIAttType, SPI_connect(), SPI_finish(), SPI_OK_FINISH, SPI_OK_SELECT, and sprintf.

Referenced by ri_restrict().

ri_CheckPermissions()

static void ri_CheckPermissions ( Relation  query_rel )

static

Definition at line 3312 of file ri_triggers.c.

{
    AclResult   aclresult;
 
    /* USAGE on schema. */
    aclresult = object_aclcheck(NamespaceRelationId,
                                RelationGetNamespace(query_rel),
                                GetUserId(), ACL_USAGE);
    if (aclresult != ACLCHECK_OK)
        aclcheck_error(aclresult, OBJECT_SCHEMA,
                       get_namespace_name(RelationGetNamespace(query_rel)));
 
    /* SELECT on relation. */
    aclresult = pg_class_aclcheck(RelationGetRelid(query_rel), GetUserId(),
                                  ACL_SELECT);
    if (aclresult != ACLCHECK_OK)
        aclcheck_error(aclresult, OBJECT_TABLE,
                       RelationGetRelationName(query_rel));
}

References ACL_SELECT, ACL_USAGE, aclcheck_error(), ACLCHECK_OK, fb(), get_namespace_name(), GetUserId(), object_aclcheck(), OBJECT_SCHEMA, OBJECT_TABLE, pg_class_aclcheck(), RelationGetNamespace, RelationGetRelationName, and RelationGetRelid.

Referenced by ri_FastPathBatchFlush(), and ri_FastPathCheck().

ri_CheckTrigger()

static void ri_CheckTrigger ( FunctionCallInfo  fcinfo, const char *  funcname, int  tgkind  )

static

Definition at line 2298 of file ri_triggers.c.

{
    TriggerData *trigdata = (TriggerData *) fcinfo->context;
 
    if (!CALLED_AS_TRIGGER(fcinfo))
        ereport(ERROR,
                (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
                 errmsg("function \"%s\" was not called by trigger manager", funcname)));
 
    /*
     * Check proper event
     */
    if (!TRIGGER_FIRED_AFTER(trigdata->tg_event) ||
        !TRIGGER_FIRED_FOR_ROW(trigdata->tg_event))
        ereport(ERROR,
                (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
                 errmsg("function \"%s\" must be fired AFTER ROW", funcname)));
 
    switch (tgkind)
    {
        case RI_TRIGTYPE_INSERT:
            if (!TRIGGER_FIRED_BY_INSERT(trigdata->tg_event))
                ereport(ERROR,
                        (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
                         errmsg("function \"%s\" must be fired for INSERT", funcname)));
            break;
        case RI_TRIGTYPE_UPDATE:
            if (!TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
                ereport(ERROR,
                        (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
                         errmsg("function \"%s\" must be fired for UPDATE", funcname)));
            break;
        case RI_TRIGTYPE_DELETE:
            if (!TRIGGER_FIRED_BY_DELETE(trigdata->tg_event))
                ereport(ERROR,
                        (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
                         errmsg("function \"%s\" must be fired for DELETE", funcname)));
            break;
    }
}

References CALLED_AS_TRIGGER, FunctionCallInfoBaseData::context, ereport, errcode(), errmsg, ERROR, fb(), funcname, RI_TRIGTYPE_DELETE, RI_TRIGTYPE_INSERT, RI_TRIGTYPE_UPDATE, TriggerData::tg_event, TRIGGER_FIRED_AFTER, TRIGGER_FIRED_BY_DELETE, TRIGGER_FIRED_BY_INSERT, TRIGGER_FIRED_BY_UPDATE, and TRIGGER_FIRED_FOR_ROW.

Referenced by RI_FKey_cascade_del(), RI_FKey_cascade_upd(), RI_FKey_check_ins(), RI_FKey_check_upd(), RI_FKey_noaction_del(), RI_FKey_noaction_upd(), RI_FKey_restrict_del(), RI_FKey_restrict_upd(), RI_FKey_setdefault_del(), RI_FKey_setdefault_upd(), RI_FKey_setnull_del(), and RI_FKey_setnull_upd().

ri_CompareWithCast()

static bool ri_CompareWithCast ( Oid  eq_opr, Oid  typeid, Oid  collid, Datum  lhs, Datum  rhs  )

static

Definition at line 3926 of file ri_triggers.c.

{
    RI_CompareHashEntry *entry = ri_HashCompareOp(eq_opr, typeid);
 
    /* Do we need to cast the values? */
    if (OidIsValid(entry->cast_func_finfo.fn_oid))
    {
        lhs = FunctionCall3(&entry->cast_func_finfo,
                            lhs,
                            Int32GetDatum(-1),  /* typmod */
                            BoolGetDatum(false));   /* implicit coercion */
        rhs = FunctionCall3(&entry->cast_func_finfo,
                            rhs,
                            Int32GetDatum(-1),  /* typmod */
                            BoolGetDatum(false));   /* implicit coercion */
    }
 
    /*
     * Apply the comparison operator.
     *
     * Note: This function is part of a call stack that determines whether an
     * update to a row is significant enough that it needs checking or action
     * on the other side of a foreign-key constraint.  Therefore, the
     * comparison here would need to be done with the collation of the *other*
     * table.  For simplicity (e.g., we might not even have the other table
     * open), we'll use our own collation.  This is fine because we require
     * that both collations have the same notion of equality (either they are
     * both deterministic or else they are both the same).
     *
     * With range/multirangetypes, the collation of the base type is stored as
     * part of the rangetype (pg_range.rngcollation), and always used, so
     * there is no danger of inconsistency even using a non-equals operator.
     * But if we support arbitrary types with PERIOD, we should perhaps just
     * always force a re-check.
     */
    return DatumGetBool(FunctionCall2Coll(&entry->eq_opr_finfo, collid, lhs, rhs));
}

References BoolGetDatum(), RI_CompareHashEntry::cast_func_finfo, collid, DatumGetBool(), RI_CompareHashEntry::eq_opr_finfo, fb(), FmgrInfo::fn_oid, FunctionCall2Coll(), FunctionCall3, Int32GetDatum(), OidIsValid, and ri_HashCompareOp().

Referenced by ri_KeysEqual().

ri_ExtractValues()

static void ri_ExtractValues ( Relation  rel, TupleTableSlot *  slot, const RI_ConstraintInfo *  riinfo, bool  rel_is_pk, Datum *  vals, char *  nulls  )

static

Definition at line 3477 of file ri_triggers.c.

{
    const int16 *attnums;
    bool        isnull;
 
    if (rel_is_pk)
        attnums = riinfo->pk_attnums;
    else
        attnums = riinfo->fk_attnums;
 
    for (int i = 0; i < riinfo->nkeys; i++)
    {
        vals[i] = slot_getattr(slot, attnums[i], &isnull);
        nulls[i] = isnull ? 'n' : ' ';
    }
}

References fb(), i, and slot_getattr().

Referenced by ri_FastPathCheck(), ri_FastPathFlushArray(), ri_FastPathFlushLoop(), and ri_PerformCheck().

ri_fastpath_is_applicable()

static bool ri_fastpath_is_applicable ( const RI_ConstraintInfo *  riinfo )

static

Definition at line 3285 of file ri_triggers.c.

{
    /*
     * Partitioned referenced tables are skipped for simplicity, since they
     * require routing the probe through the correct partition using
     * PartitionDirectory.
     */
    if (riinfo->pk_is_partitioned)
        return false;
 
    /*
     * Temporal foreign keys use range overlap and containment semantics (&&,
     * <@, range_agg()) that inherently involve aggregation and multiple-row
     * reasoning, so they stay on the SPI path.
     */
    if (riinfo->hasperiod)
        return false;
 
    return true;
}

References fb().

Referenced by RI_FKey_check().

ri_FastPathBatchAdd()

static void ri_FastPathBatchAdd ( const RI_ConstraintInfo *  riinfo, Relation  fk_rel, TupleTableSlot *  newslot  )

static

Definition at line 2859 of file ri_triggers.c.

{
    RI_FastPathEntry *fpentry = ri_FastPathGetEntry(riinfo, fk_rel);
    MemoryContext oldcxt;
 
    oldcxt = MemoryContextSwitchTo(fpentry->flush_cxt);
    fpentry->batch[fpentry->batch_count] =
        ExecCopySlotHeapTuple(newslot);
    fpentry->batch_count++;
    MemoryContextSwitchTo(oldcxt);
 
    if (fpentry->batch_count >= RI_FASTPATH_BATCH_SIZE)
        ri_FastPathBatchFlush(fpentry, fk_rel, riinfo);
}

References ExecCopySlotHeapTuple(), fb(), MemoryContextSwitchTo(), RI_FASTPATH_BATCH_SIZE, ri_FastPathBatchFlush(), and ri_FastPathGetEntry().

Referenced by RI_FKey_check().

ri_FastPathBatchFlush()

static void ri_FastPathBatchFlush ( RI_FastPathEntry *  fpentry, Relation  fk_rel, const RI_ConstraintInfo *  riinfo  )

static

Definition at line 2885 of file ri_triggers.c.

{
    Relation    pk_rel = fpentry->pk_rel;
    Relation    idx_rel = fpentry->idx_rel;
    TupleTableSlot *fk_slot = fpentry->fk_slot;
    Snapshot    snapshot;
    IndexScanDesc scandesc;
    Oid         saved_userid;
    int         saved_sec_context;
    MemoryContext oldcxt;
    int         violation_index;
 
    if (fpentry->batch_count == 0)
        return;
 
    /*
     * CCI and security context switch are done once for the entire batch.
     * Per-row CCI is unnecessary because by the time a flush runs, all AFTER
     * triggers for the buffered rows have already fired (trigger invocations
     * strictly alternate per row), so a single CCI advances past all their
     * effects.  Per-row security context switch is unnecessary because each
     * row's probe runs entirely as the PK table owner, same as the SPI path
     * -- the only difference is that the SPI path sets and restores the
     * context per row whereas we do it once around the whole batch.
     */
    CommandCounterIncrement();
    snapshot = RegisterSnapshot(GetTransactionSnapshot());
 
    /*
     * build_index_scankeys() may palloc cast results for cross-type FKs. Use
     * the entry's short-lived flush context so these don't accumulate across
     * batches.
     */
    oldcxt = MemoryContextSwitchTo(fpentry->flush_cxt);
 
    scandesc = index_beginscan(pk_rel, idx_rel, snapshot, NULL,
                               riinfo->nkeys, 0, SO_NONE);
 
    GetUserIdAndSecContext(&saved_userid, &saved_sec_context);
    SetUserIdAndSecContext(RelationGetForm(pk_rel)->relowner,
                           saved_sec_context |
                           SECURITY_LOCAL_USERID_CHANGE |
                           SECURITY_NOFORCE_RLS);
 
    /*
     * Check that the current user has permission to access pk_rel. Done here
     * rather than at entry creation so that permission changes between
     * flushes are respected, matching the per-row behavior of the SPI path,
     * albeit checked once per flush rather than once per row, like in
     * ri_FastPathCheck().
     */
    ri_CheckPermissions(pk_rel);
 
    if (riinfo->fpmeta == NULL)
    {
        /* Reload to ensure it's valid. */
        riinfo = ri_LoadConstraintInfo(riinfo->constraint_id);
        ri_populate_fastpath_metadata((RI_ConstraintInfo *) riinfo,
                                      fk_rel, idx_rel);
    }
    Assert(riinfo->fpmeta);
 
    /* Skip array overhead for single-row batches. */
    if (riinfo->nkeys == 1 && fpentry->batch_count > 1)
        violation_index = ri_FastPathFlushArray(fpentry, fk_slot, riinfo,
                                                fk_rel, snapshot, scandesc);
    else
        violation_index = ri_FastPathFlushLoop(fpentry, fk_slot, riinfo,
                                               fk_rel, snapshot, scandesc);
 
    SetUserIdAndSecContext(saved_userid, saved_sec_context);
    UnregisterSnapshot(snapshot);
    index_endscan(scandesc);
 
    if (violation_index >= 0)
    {
        ExecStoreHeapTuple(fpentry->batch[violation_index], fk_slot, false);
        ri_ReportViolation(riinfo, pk_rel, fk_rel,
                           fk_slot, NULL,
                           RI_PLAN_CHECK_LOOKUPPK, false, false);
    }
 
    MemoryContextReset(fpentry->flush_cxt);
    MemoryContextSwitchTo(oldcxt);
 
    /* Reset. */
    fpentry->batch_count = 0;
}

References Assert, CommandCounterIncrement(), ExecStoreHeapTuple(), fb(), GetTransactionSnapshot(), GetUserIdAndSecContext(), index_beginscan(), index_endscan(), MemoryContextReset(), MemoryContextSwitchTo(), RegisterSnapshot(), RelationGetForm, ri_CheckPermissions(), ri_FastPathFlushArray(), ri_FastPathFlushLoop(), ri_LoadConstraintInfo(), RI_PLAN_CHECK_LOOKUPPK, ri_populate_fastpath_metadata(), ri_ReportViolation(), SECURITY_LOCAL_USERID_CHANGE, SECURITY_NOFORCE_RLS, SetUserIdAndSecContext(), SO_NONE, and UnregisterSnapshot().

Referenced by ri_FastPathBatchAdd(), and ri_FastPathEndBatch().

ri_FastPathCheck()

static void ri_FastPathCheck ( const RI_ConstraintInfo *  riinfo, Relation  fk_rel, TupleTableSlot *  newslot  )

static

Definition at line 2779 of file ri_triggers.c.

{
    Relation    pk_rel;
    Relation    idx_rel;
    IndexScanDesc scandesc;
    TupleTableSlot *slot;
    Datum       pk_vals[INDEX_MAX_KEYS];
    char        pk_nulls[INDEX_MAX_KEYS];
    ScanKeyData skey[INDEX_MAX_KEYS];
    bool        found = false;
    Oid         saved_userid;
    int         saved_sec_context;
    Snapshot    snapshot;
 
    /*
     * Advance the command counter so the snapshot sees the effects of prior
     * triggers in this statement.  Mirrors what the SPI path does in
     * ri_PerformCheck().
     */
    CommandCounterIncrement();
    snapshot = RegisterSnapshot(GetTransactionSnapshot());
 
    pk_rel = table_open(riinfo->pk_relid, RowShareLock);
    idx_rel = index_open(riinfo->conindid, AccessShareLock);
 
    slot = table_slot_create(pk_rel, NULL);
    scandesc = index_beginscan(pk_rel, idx_rel,
                               snapshot, NULL,
                               riinfo->nkeys, 0,
                               SO_NONE);
 
    GetUserIdAndSecContext(&saved_userid, &saved_sec_context);
    SetUserIdAndSecContext(RelationGetForm(pk_rel)->relowner,
                           saved_sec_context |
                           SECURITY_LOCAL_USERID_CHANGE |
                           SECURITY_NOFORCE_RLS);
    ri_CheckPermissions(pk_rel);
 
    if (riinfo->fpmeta == NULL)
    {
        /* Reload to ensure it's valid. */
        riinfo = ri_LoadConstraintInfo(riinfo->constraint_id);
        ri_populate_fastpath_metadata((RI_ConstraintInfo *) riinfo,
                                      fk_rel, idx_rel);
    }
    Assert(riinfo->fpmeta);
    ri_ExtractValues(fk_rel, newslot, riinfo, false, pk_vals, pk_nulls);
    build_index_scankeys(riinfo, idx_rel, pk_vals, pk_nulls, skey);
    found = ri_FastPathProbeOne(pk_rel, idx_rel, scandesc, slot,
                                snapshot, riinfo, skey, riinfo->nkeys);
    SetUserIdAndSecContext(saved_userid, saved_sec_context);
    index_endscan(scandesc);
    ExecDropSingleTupleTableSlot(slot);
    UnregisterSnapshot(snapshot);
 
    if (!found)
        ri_ReportViolation(riinfo, pk_rel, fk_rel,
                           newslot, NULL,
                           RI_PLAN_CHECK_LOOKUPPK, false, false);
 
    index_close(idx_rel, NoLock);
    table_close(pk_rel, NoLock);
}

References AccessShareLock, Assert, build_index_scankeys(), CommandCounterIncrement(), ExecDropSingleTupleTableSlot(), fb(), GetTransactionSnapshot(), GetUserIdAndSecContext(), index_beginscan(), index_close(), index_endscan(), INDEX_MAX_KEYS, index_open(), NoLock, RegisterSnapshot(), RelationGetForm, ri_CheckPermissions(), ri_ExtractValues(), ri_FastPathProbeOne(), ri_LoadConstraintInfo(), RI_PLAN_CHECK_LOOKUPPK, ri_populate_fastpath_metadata(), ri_ReportViolation(), RowShareLock, SECURITY_LOCAL_USERID_CHANGE, SECURITY_NOFORCE_RLS, SetUserIdAndSecContext(), SO_NONE, table_close(), table_open(), table_slot_create(), and UnregisterSnapshot().

Referenced by RI_FKey_check().

ri_FastPathEndBatch()

static void ri_FastPathEndBatch ( void *  arg )

static

Definition at line 4109 of file ri_triggers.c.

{
    HASH_SEQ_STATUS status;
    RI_FastPathEntry *entry;
 
    if (ri_fastpath_cache == NULL)
        return;
 
    /* Flush any partial batches -- can throw ERROR */
    hash_seq_init(&status, ri_fastpath_cache);
    while ((entry = hash_seq_search(&status)) != NULL)
    {
        if (entry->batch_count > 0)
        {
            Relation    fk_rel = table_open(entry->fk_relid, AccessShareLock);
            const RI_ConstraintInfo *riinfo = ri_LoadConstraintInfo(entry->conoid);
 
            ri_FastPathBatchFlush(entry, fk_rel, riinfo);
            table_close(fk_rel, NoLock);
        }
    }
 
    ri_FastPathTeardown();
}

References AccessShareLock, RI_FastPathEntry::batch_count, RI_FastPathEntry::conoid, fb(), RI_FastPathEntry::fk_relid, hash_seq_init(), hash_seq_search(), NoLock, ri_fastpath_cache, ri_FastPathBatchFlush(), ri_FastPathTeardown(), ri_LoadConstraintInfo(), table_close(), and table_open().

Referenced by ri_FastPathGetEntry().

ri_FastPathFlushArray()

static int ri_FastPathFlushArray ( RI_FastPathEntry *  fpentry, TupleTableSlot *  fk_slot, const RI_ConstraintInfo *  riinfo, Relation  fk_rel, Snapshot  snapshot, IndexScanDesc  scandesc  )

static

Definition at line 3031 of file ri_triggers.c.

{
    FastPathMeta *fpmeta = riinfo->fpmeta;
    Relation    pk_rel = fpentry->pk_rel;
    Relation    idx_rel = fpentry->idx_rel;
    TupleTableSlot *pk_slot = fpentry->pk_slot;
    Datum       search_vals[RI_FASTPATH_BATCH_SIZE];
    bool        matched[RI_FASTPATH_BATCH_SIZE];
    int         nvals = fpentry->batch_count;
    Datum       pk_vals[INDEX_MAX_KEYS];
    char        pk_nulls[INDEX_MAX_KEYS];
    ScanKeyData skey[1];
    FmgrInfo   *cast_func_finfo;
    FmgrInfo   *eq_opr_finfo;
    Oid         elem_type;
    int16       elem_len;
    bool        elem_byval;
    char        elem_align;
    ArrayType  *arr;
 
    Assert(fpmeta);
 
    memset(matched, 0, nvals * sizeof(bool));
 
    /*
     * Extract FK values, casting to the operator's expected input type if
     * needed (e.g. int8 FK -> int4 for int48eq).
     */
    cast_func_finfo = &fpmeta->cast_func_finfo[0];
    eq_opr_finfo = &fpmeta->eq_opr_finfo[0];
    for (int i = 0; i < nvals; i++)
    {
        ExecStoreHeapTuple(fpentry->batch[i], fk_slot, false);
        ri_ExtractValues(fk_rel, fk_slot, riinfo, false, pk_vals, pk_nulls);
 
        /* Cast if needed (e.g. int8 FK -> numeric PK) */
        if (OidIsValid(cast_func_finfo->fn_oid))
            search_vals[i] = FunctionCall3(cast_func_finfo,
                                           pk_vals[0],
                                           Int32GetDatum(-1),
                                           BoolGetDatum(false));
        else
            search_vals[i] = pk_vals[0];
    }
 
    /*
     * Array element type must match the operator's right-hand input type,
     * which is what the index comparison expects on the search side.
     * ri_populate_fastpath_metadata() stores exactly this via
     * get_op_opfamily_properties(), which returns the operator's right-hand
     * type as the subtype for cross-type operators (e.g. int8 for int48eq)
     * and the common type for same-type operators.
     */
    elem_type = fpmeta->subtypes[0];
    Assert(OidIsValid(elem_type));
    get_typlenbyvalalign(elem_type, &elem_len, &elem_byval, &elem_align);
 
    arr = construct_array(search_vals, nvals,
                          elem_type, elem_len, elem_byval, elem_align);
 
    /*
     * Build scan key with SK_SEARCHARRAY.  The index AM code will internally
     * sort and deduplicate, then walk leaf pages in order.
     *
     * PK indexes are always btree, which supports SK_SEARCHARRAY.
     */
    Assert(idx_rel->rd_indam->amsearcharray);
    ScanKeyEntryInitialize(&skey[0],
                           SK_SEARCHARRAY,
                           1,   /* attno */
                           fpmeta->strats[0],
                           fpmeta->subtypes[0],
                           idx_rel->rd_indcollation[0],
                           fpmeta->regops[0],
                           PointerGetDatum(arr));
 
    index_rescan(scandesc, skey, 1, NULL, 0);
 
    /*
     * Walk all matches.  The index AM returns them in index order.  For each
     * match, find which batch item(s) it satisfies.
     */
    while (index_getnext_slot(scandesc, ForwardScanDirection, pk_slot))
    {
        Datum       found_val;
        bool        found_null;
        bool        concurrently_updated;
        ScanKeyData recheck_skey[1];
 
        if (!ri_LockPKTuple(pk_rel, pk_slot, snapshot, &concurrently_updated))
            continue;
 
        /* Extract the PK value from the matched and locked tuple */
        found_val = slot_getattr(pk_slot, riinfo->pk_attnums[0], &found_null);
        Assert(!found_null);
 
        if (concurrently_updated)
        {
            /*
             * Build a single-key scankey for recheck.  We need the actual PK
             * value that was found, not the FK search value.
             */
            ScanKeyEntryInitialize(&recheck_skey[0], 0, 1,
                                   fpmeta->strats[0],
                                   fpmeta->subtypes[0],
                                   idx_rel->rd_indcollation[0],
                                   fpmeta->regops[0],
                                   found_val);
            if (!recheck_matched_pk_tuple(idx_rel, recheck_skey, 1, pk_slot))
                continue;
        }
 
        /*
         * Linear scan to mark all batch items matching this PK value.
         * O(batch_size) per match, O(batch_size^2) worst case -- fine for the
         * current batch size of 64.
         */
        for (int i = 0; i < nvals; i++)
        {
            if (!matched[i] &&
                DatumGetBool(FunctionCall2Coll(eq_opr_finfo,
                                               idx_rel->rd_indcollation[0],
                                               found_val,
                                               search_vals[i])))
                matched[i] = true;
        }
    }
 
    /* Report first unmatched row */
    for (int i = 0; i < nvals; i++)
        if (!matched[i])
            return i;
 
    /* All pass. */
    return -1;
}

References IndexAmRoutine::amsearcharray, Assert, BoolGetDatum(), FastPathMeta::cast_func_finfo, construct_array(), DatumGetBool(), FastPathMeta::eq_opr_finfo, ExecStoreHeapTuple(), fb(), FmgrInfo::fn_oid, ForwardScanDirection, FunctionCall2Coll(), FunctionCall3, get_typlenbyvalalign(), i, index_getnext_slot(), INDEX_MAX_KEYS, index_rescan(), Int32GetDatum(), OidIsValid, PointerGetDatum(), RelationData::rd_indam, RelationData::rd_indcollation, recheck_matched_pk_tuple(), FastPathMeta::regops, ri_ExtractValues(), RI_FASTPATH_BATCH_SIZE, ri_LockPKTuple(), ScanKeyEntryInitialize(), SK_SEARCHARRAY, slot_getattr(), FastPathMeta::strats, and FastPathMeta::subtypes.

Referenced by ri_FastPathBatchFlush().

ri_FastPathFlushLoop()

static int ri_FastPathFlushLoop ( RI_FastPathEntry *  fpentry, TupleTableSlot *  fk_slot, const RI_ConstraintInfo *  riinfo, Relation  fk_rel, Snapshot  snapshot, IndexScanDesc  scandesc  )

static

Definition at line 2987 of file ri_triggers.c.

{
    Relation    pk_rel = fpentry->pk_rel;
    Relation    idx_rel = fpentry->idx_rel;
    TupleTableSlot *pk_slot = fpentry->pk_slot;
    Datum       pk_vals[INDEX_MAX_KEYS];
    char        pk_nulls[INDEX_MAX_KEYS];
    ScanKeyData skey[INDEX_MAX_KEYS];
    bool        found = true;
 
    for (int i = 0; i < fpentry->batch_count; i++)
    {
        ExecStoreHeapTuple(fpentry->batch[i], fk_slot, false);
        ri_ExtractValues(fk_rel, fk_slot, riinfo, false, pk_vals, pk_nulls);
        build_index_scankeys(riinfo, idx_rel, pk_vals, pk_nulls, skey);
 
        found = ri_FastPathProbeOne(pk_rel, idx_rel, scandesc, pk_slot,
                                    snapshot, riinfo, skey, riinfo->nkeys);
 
        /* Report first unmatched row */
        if (!found)
            return i;
    }
 
    /* All pass. */
    return -1;
}

References build_index_scankeys(), ExecStoreHeapTuple(), fb(), i, INDEX_MAX_KEYS, ri_ExtractValues(), and ri_FastPathProbeOne().

Referenced by ri_FastPathBatchFlush().

ri_FastPathGetEntry()

static RI_FastPathEntry * ri_FastPathGetEntry ( const RI_ConstraintInfo *  riinfo, Relation  fk_rel  )

static

Definition at line 4210 of file ri_triggers.c.

{
    RI_FastPathEntry *entry;
    bool        found;
 
    /* Create hash table on first use in this batch */
    if (ri_fastpath_cache == NULL)
    {
        HASHCTL     ctl;
 
        if (!ri_fastpath_xact_callback_registered)
        {
            RegisterXactCallback(ri_FastPathXactCallback, NULL);
            RegisterSubXactCallback(ri_FastPathSubXactCallback, NULL);
            ri_fastpath_xact_callback_registered = true;
        }
 
        ctl.keysize = sizeof(Oid);
        ctl.entrysize = sizeof(RI_FastPathEntry);
        ctl.hcxt = TopTransactionContext;
        ri_fastpath_cache = hash_create("RI fast-path cache",
                                        16,
                                        &ctl,
                                        HASH_ELEM | HASH_BLOBS | HASH_CONTEXT);
    }
 
    entry = hash_search(ri_fastpath_cache, &riinfo->constraint_id,
                        HASH_ENTER, &found);
 
    if (!found)
    {
        MemoryContext oldcxt;
 
        /*
         * Zero out non-key fields so ri_FastPathTeardown is safe if we error
         * out during partial initialization below.
         */
        memset(((char *) entry) + offsetof(RI_FastPathEntry, pk_rel), 0,
               sizeof(RI_FastPathEntry) - offsetof(RI_FastPathEntry, pk_rel));
 
        oldcxt = MemoryContextSwitchTo(TopTransactionContext);
 
        entry->fk_relid = RelationGetRelid(fk_rel);
 
        /*
         * Open PK table and its unique index.
         *
         * RowShareLock on pk_rel matches what the SPI path's SELECT ... FOR
         * KEY SHARE would acquire as a relation-level lock. AccessShareLock
         * on the index is standard for index scans.
         *
         * We don't release these locks until end of transaction, matching SPI
         * behavior.
         */
        entry->pk_rel = table_open(riinfo->pk_relid, RowShareLock);
        entry->idx_rel = index_open(riinfo->conindid, AccessShareLock);
        entry->pk_slot = table_slot_create(entry->pk_rel, NULL);
 
        /*
         * Must be TTSOpsHeapTuple because ExecStoreHeapTuple() is used to
         * load entries from batch[] into this slot for value extraction.
         */
        entry->fk_slot = MakeSingleTupleTableSlot(RelationGetDescr(fk_rel),
                                                  &TTSOpsHeapTuple);
 
        entry->flush_cxt = AllocSetContextCreate(TopTransactionContext,
                                                 "RI fast path flush temporary context",
                                                 ALLOCSET_SMALL_SIZES);
        MemoryContextSwitchTo(oldcxt);
 
        /* Ensure cleanup at end of this trigger-firing batch */
        if (!ri_fastpath_callback_registered)
        {
            RegisterAfterTriggerBatchCallback(ri_FastPathEndBatch, NULL);
            ri_fastpath_callback_registered = true;
        }
    }
 
    return entry;
}

References AccessShareLock, ALLOCSET_SMALL_SIZES, AllocSetContextCreate, ctl, fb(), HASH_BLOBS, HASH_CONTEXT, hash_create(), HASH_ELEM, HASH_ENTER, hash_search(), index_open(), MakeSingleTupleTableSlot(), MemoryContextSwitchTo(), RegisterAfterTriggerBatchCallback(), RegisterSubXactCallback(), RegisterXactCallback(), RelationGetDescr, RelationGetRelid, ri_fastpath_cache, ri_fastpath_callback_registered, ri_fastpath_xact_callback_registered, ri_FastPathEndBatch(), ri_FastPathSubXactCallback(), ri_FastPathXactCallback(), RowShareLock, table_open(), table_slot_create(), TopTransactionContext, and TTSOpsHeapTuple.

Referenced by ri_FastPathBatchAdd().

ri_FastPathProbeOne()

static bool ri_FastPathProbeOne ( Relation  pk_rel, Relation  idx_rel, IndexScanDesc  scandesc, TupleTableSlot *  slot, Snapshot  snapshot, const RI_ConstraintInfo *  riinfo, ScanKeyData *  skey, int  nkeys  )

static

Definition at line 3179 of file ri_triggers.c.

{
    bool        found = false;
 
    index_rescan(scandesc, skey, nkeys, NULL, 0);
 
    if (index_getnext_slot(scandesc, ForwardScanDirection, slot))
    {
        bool        concurrently_updated;
 
        if (ri_LockPKTuple(pk_rel, slot, snapshot,
                           &concurrently_updated))
        {
            if (concurrently_updated)
                found = recheck_matched_pk_tuple(idx_rel, skey, nkeys, slot);
            else
                found = true;
        }
    }
 
    return found;
}

References fb(), ForwardScanDirection, index_getnext_slot(), index_rescan(), recheck_matched_pk_tuple(), and ri_LockPKTuple().

Referenced by ri_FastPathCheck(), and ri_FastPathFlushLoop().

ri_FastPathSubXactCallback()

static void ri_FastPathSubXactCallback ( SubXactEvent  event, SubTransactionId  mySubid, SubTransactionId  parentSubid, void *  arg  )

static

Definition at line 4184 of file ri_triggers.c.

{
    if (event == SUBXACT_EVENT_ABORT_SUB)
    {
        /*
         * ResourceOwner already released relations.  NULL the static pointers
         * so the still-registered batch callback becomes a no-op for the rest
         * of this transaction.
         */
        ri_fastpath_cache = NULL;
        ri_fastpath_callback_registered = false;
    }
}

References fb(), ri_fastpath_cache, ri_fastpath_callback_registered, and SUBXACT_EVENT_ABORT_SUB.

Referenced by ri_FastPathGetEntry().

ri_FastPathTeardown()

static void ri_FastPathTeardown ( void  )

static

Definition at line 4141 of file ri_triggers.c.

{
    HASH_SEQ_STATUS status;
    RI_FastPathEntry *entry;
 
    if (ri_fastpath_cache == NULL)
        return;
 
    hash_seq_init(&status, ri_fastpath_cache);
    while ((entry = hash_seq_search(&status)) != NULL)
    {
        if (entry->idx_rel)
            index_close(entry->idx_rel, NoLock);
        if (entry->pk_rel)
            table_close(entry->pk_rel, NoLock);
        if (entry->pk_slot)
            ExecDropSingleTupleTableSlot(entry->pk_slot);
        if (entry->fk_slot)
            ExecDropSingleTupleTableSlot(entry->fk_slot);
        if (entry->flush_cxt)
            MemoryContextDelete(entry->flush_cxt);
    }
 
    hash_destroy(ri_fastpath_cache);
    ri_fastpath_cache = NULL;
    ri_fastpath_callback_registered = false;
}

References ExecDropSingleTupleTableSlot(), fb(), RI_FastPathEntry::fk_slot, RI_FastPathEntry::flush_cxt, hash_destroy(), hash_seq_init(), hash_seq_search(), RI_FastPathEntry::idx_rel, index_close(), MemoryContextDelete(), NoLock, RI_FastPathEntry::pk_rel, RI_FastPathEntry::pk_slot, ri_fastpath_cache, ri_fastpath_callback_registered, and table_close().

Referenced by ri_FastPathEndBatch().

ri_FastPathXactCallback()

static void ri_FastPathXactCallback ( XactEvent  event, void *  arg  )

static

Definition at line 4172 of file ri_triggers.c.

{
    /*
     * On abort, ResourceOwner already released relations; on commit,
     * ri_FastPathTeardown already ran.  Either way, just NULL the static
     * pointers so they don't dangle into the next transaction.
     */
    ri_fastpath_cache = NULL;
    ri_fastpath_callback_registered = false;
}

References fb(), ri_fastpath_cache, and ri_fastpath_callback_registered.

Referenced by ri_FastPathGetEntry().

ri_FetchConstraintInfo()

static const RI_ConstraintInfo * ri_FetchConstraintInfo ( Trigger *  trigger, Relation  trig_rel, bool  rel_is_pk  )

static

Definition at line 2344 of file ri_triggers.c.

{
    Oid         constraintOid = trigger->tgconstraint;
    const RI_ConstraintInfo *riinfo;
 
    /*
     * Check that the FK constraint's OID is available; it might not be if
     * we've been invoked via an ordinary trigger or an old-style "constraint
     * trigger".
     */
    if (!OidIsValid(constraintOid))
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
                 errmsg("no pg_constraint entry for trigger \"%s\" on table \"%s\"",
                        trigger->tgname, RelationGetRelationName(trig_rel)),
                 errhint("Remove this referential integrity trigger and its mates, then do ALTER TABLE ADD CONSTRAINT.")));
 
    /* Find or create a hashtable entry for the constraint */
    riinfo = ri_LoadConstraintInfo(constraintOid);
 
    /* Do some easy cross-checks against the trigger call data */
    if (rel_is_pk)
    {
        if (riinfo->fk_relid != trigger->tgconstrrelid ||
            riinfo->pk_relid != RelationGetRelid(trig_rel))
            elog(ERROR, "wrong pg_constraint entry for trigger \"%s\" on table \"%s\"",
                 trigger->tgname, RelationGetRelationName(trig_rel));
    }
    else
    {
        if (riinfo->fk_relid != RelationGetRelid(trig_rel) ||
            riinfo->pk_relid != trigger->tgconstrrelid)
            elog(ERROR, "wrong pg_constraint entry for trigger \"%s\" on table \"%s\"",
                 trigger->tgname, RelationGetRelationName(trig_rel));
    }
 
    if (riinfo->confmatchtype != FKCONSTR_MATCH_FULL &&
        riinfo->confmatchtype != FKCONSTR_MATCH_PARTIAL &&
        riinfo->confmatchtype != FKCONSTR_MATCH_SIMPLE)
        elog(ERROR, "unrecognized confmatchtype: %d",
             riinfo->confmatchtype);
 
    if (riinfo->confmatchtype == FKCONSTR_MATCH_PARTIAL)
        ereport(ERROR,
                (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                 errmsg("MATCH PARTIAL not yet implemented")));
 
    return riinfo;
}

References elog, ereport, errcode(), errhint(), errmsg, ERROR, fb(), FKCONSTR_MATCH_FULL, FKCONSTR_MATCH_PARTIAL, FKCONSTR_MATCH_SIMPLE, OidIsValid, RelationGetRelationName, RelationGetRelid, and ri_LoadConstraintInfo().

Referenced by RI_FKey_cascade_del(), RI_FKey_cascade_upd(), RI_FKey_check(), RI_FKey_fk_upd_check_required(), RI_FKey_pk_upd_check_required(), RI_Initial_Check(), RI_PartitionRemove_Check(), ri_restrict(), and ri_set().

ri_FetchPreparedPlan()

static SPIPlanPtr ri_FetchPreparedPlan ( RI_QueryKey *  key )

static

Definition at line 3751 of file ri_triggers.c.

{
    RI_QueryHashEntry *entry;
    SPIPlanPtr  plan;
 
    /*
     * On the first call initialize the hashtable
     */
    if (!ri_query_cache)
        ri_InitHashTables();
 
    /*
     * Lookup for the key
     */
    entry = (RI_QueryHashEntry *) hash_search(ri_query_cache,
                                              key,
                                              HASH_FIND, NULL);
    if (entry == NULL)
        return NULL;
 
    /*
     * Check whether the plan is still valid.  If it isn't, we don't want to
     * simply rely on plancache.c to regenerate it; rather we should start
     * from scratch and rebuild the query text too.  This is to cover cases
     * such as table/column renames.  We depend on the plancache machinery to
     * detect possible invalidations, though.
     *
     * CAUTION: this check is only trustworthy if the caller has already
     * locked both FK and PK rels.
     */
    plan = entry->plan;
    if (plan && SPI_plan_is_valid(plan))
        return plan;
 
    /*
     * Otherwise we might as well flush the cached plan now, to free a little
     * memory space before we make a new one.
     */
    entry->plan = NULL;
    if (plan)
        SPI_freeplan(plan);
 
    return NULL;
}

References fb(), HASH_FIND, hash_search(), RI_QueryHashEntry::plan, plan, ri_InitHashTables(), ri_query_cache, SPI_freeplan(), and SPI_plan_is_valid().

Referenced by ri_Check_Pk_Match(), RI_FKey_cascade_del(), RI_FKey_cascade_upd(), RI_FKey_check(), ri_restrict(), and ri_set().

RI_FKey_cascade_del()

Datum RI_FKey_cascade_del

(

PG_FUNCTION_ARGS

)

Definition at line 1045 of file ri_triggers.c.

{
    TriggerData *trigdata = (TriggerData *) fcinfo->context;
    const RI_ConstraintInfo *riinfo;
    Relation    fk_rel;
    Relation    pk_rel;
    TupleTableSlot *oldslot;
    RI_QueryKey qkey;
    SPIPlanPtr  qplan;
 
    /* Check that this is a valid trigger call on the right time and event. */
    ri_CheckTrigger(fcinfo, "RI_FKey_cascade_del", RI_TRIGTYPE_DELETE);
 
    riinfo = ri_FetchConstraintInfo(trigdata->tg_trigger,
                                    trigdata->tg_relation, true);
 
    /*
     * Get the relation descriptors of the FK and PK tables and the old tuple.
     *
     * fk_rel is opened in RowExclusiveLock mode since that's what our
     * eventual DELETE will get on it.
     */
    fk_rel = table_open(riinfo->fk_relid, RowExclusiveLock);
    pk_rel = trigdata->tg_relation;
    oldslot = trigdata->tg_trigslot;
 
    SPI_connect();
 
    /* Fetch or prepare a saved plan for the cascaded delete */
    ri_BuildQueryKey(&qkey, riinfo, RI_PLAN_CASCADE_ONDELETE);
 
    if ((qplan = ri_FetchPreparedPlan(&qkey)) == NULL)
    {
        StringInfoData querybuf;
        char        fkrelname[MAX_QUOTED_REL_NAME_LEN];
        char        attname[MAX_QUOTED_NAME_LEN];
        char        paramname[16];
        const char *querysep;
        Oid         queryoids[RI_MAX_NUMKEYS];
        const char *fk_only;
 
        /* ----------
         * The query string built is
         *  DELETE FROM [ONLY] <fktable> WHERE $1 = fkatt1 [AND ...]
         * The type id's for the $ parameters are those of the
         * corresponding PK attributes.
         * ----------
         */
        initStringInfo(&querybuf);
        fk_only = fk_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ?
            "" : "ONLY ";
        quoteRelationName(fkrelname, fk_rel);
        appendStringInfo(&querybuf, "DELETE FROM %s%s",
                         fk_only, fkrelname);
        querysep = "WHERE";
        for (int i = 0; i < riinfo->nkeys; i++)
        {
            Oid         pk_type = RIAttType(pk_rel, riinfo->pk_attnums[i]);
            Oid         fk_type = RIAttType(fk_rel, riinfo->fk_attnums[i]);
 
            quoteOneName(attname,
                         RIAttName(fk_rel, riinfo->fk_attnums[i]));
            sprintf(paramname, "$%d", i + 1);
            ri_GenerateQual(&querybuf, querysep,
                            paramname, pk_type,
                            riinfo->pf_eq_oprs[i],
                            attname, fk_type);
            querysep = "AND";
            queryoids[i] = pk_type;
        }
 
        /* Prepare and save the plan */
        qplan = ri_PlanCheck(querybuf.data, riinfo->nkeys, queryoids,
                             &qkey, fk_rel, pk_rel);
    }
 
    /*
     * We have a plan now. Build up the arguments from the key values in the
     * deleted PK tuple and delete the referencing rows
     */
    ri_PerformCheck(riinfo, &qkey, qplan,
                    fk_rel, pk_rel,
                    oldslot, NULL,
                    false,
                    true,       /* must detect new rows */
                    SPI_OK_DELETE);
 
    if (SPI_finish() != SPI_OK_FINISH)
        elog(ERROR, "SPI_finish failed");
 
    table_close(fk_rel, RowExclusiveLock);
 
    return PointerGetDatum(NULL);
}

References appendStringInfo(), attname, elog, ERROR, fb(), i, initStringInfo(), MAX_QUOTED_NAME_LEN, MAX_QUOTED_REL_NAME_LEN, PointerGetDatum(), quoteOneName(), quoteRelationName(), ri_BuildQueryKey(), ri_CheckTrigger(), ri_FetchConstraintInfo(), ri_FetchPreparedPlan(), ri_GenerateQual(), RI_MAX_NUMKEYS, ri_PerformCheck(), RI_PLAN_CASCADE_ONDELETE, ri_PlanCheck(), RI_TRIGTYPE_DELETE, RIAttName, RIAttType, RowExclusiveLock, SPI_connect(), SPI_finish(), SPI_OK_DELETE, SPI_OK_FINISH, sprintf, table_close(), table_open(), TriggerData::tg_relation, TriggerData::tg_trigger, and TriggerData::tg_trigslot.

RI_FKey_cascade_upd()

Datum RI_FKey_cascade_upd

(

PG_FUNCTION_ARGS

)

Definition at line 1147 of file ri_triggers.c.

{
    TriggerData *trigdata = (TriggerData *) fcinfo->context;
    const RI_ConstraintInfo *riinfo;
    Relation    fk_rel;
    Relation    pk_rel;
    TupleTableSlot *newslot;
    TupleTableSlot *oldslot;
    RI_QueryKey qkey;
    SPIPlanPtr  qplan;
 
    /* Check that this is a valid trigger call on the right time and event. */
    ri_CheckTrigger(fcinfo, "RI_FKey_cascade_upd", RI_TRIGTYPE_UPDATE);
 
    riinfo = ri_FetchConstraintInfo(trigdata->tg_trigger,
                                    trigdata->tg_relation, true);
 
    /*
     * Get the relation descriptors of the FK and PK tables and the new and
     * old tuple.
     *
     * fk_rel is opened in RowExclusiveLock mode since that's what our
     * eventual UPDATE will get on it.
     */
    fk_rel = table_open(riinfo->fk_relid, RowExclusiveLock);
    pk_rel = trigdata->tg_relation;
    newslot = trigdata->tg_newslot;
    oldslot = trigdata->tg_trigslot;
 
    SPI_connect();
 
    /* Fetch or prepare a saved plan for the cascaded update */
    ri_BuildQueryKey(&qkey, riinfo, RI_PLAN_CASCADE_ONUPDATE);
 
    if ((qplan = ri_FetchPreparedPlan(&qkey)) == NULL)
    {
        StringInfoData querybuf;
        StringInfoData qualbuf;
        char        fkrelname[MAX_QUOTED_REL_NAME_LEN];
        char        attname[MAX_QUOTED_NAME_LEN];
        char        paramname[16];
        const char *querysep;
        const char *qualsep;
        Oid         queryoids[RI_MAX_NUMKEYS * 2];
        const char *fk_only;
 
        /* ----------
         * The query string built is
         *  UPDATE [ONLY] <fktable> SET fkatt1 = $1 [, ...]
         *          WHERE $n = fkatt1 [AND ...]
         * The type id's for the $ parameters are those of the
         * corresponding PK attributes.  Note that we are assuming
         * there is an assignment cast from the PK to the FK type;
         * else the parser will fail.
         * ----------
         */
        initStringInfo(&querybuf);
        initStringInfo(&qualbuf);
        fk_only = fk_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ?
            "" : "ONLY ";
        quoteRelationName(fkrelname, fk_rel);
        appendStringInfo(&querybuf, "UPDATE %s%s SET",
                         fk_only, fkrelname);
        querysep = "";
        qualsep = "WHERE";
        for (int i = 0, j = riinfo->nkeys; i < riinfo->nkeys; i++, j++)
        {
            Oid         pk_type = RIAttType(pk_rel, riinfo->pk_attnums[i]);
            Oid         fk_type = RIAttType(fk_rel, riinfo->fk_attnums[i]);
 
            quoteOneName(attname,
                         RIAttName(fk_rel, riinfo->fk_attnums[i]));
            appendStringInfo(&querybuf,
                             "%s %s = $%d",
                             querysep, attname, i + 1);
            sprintf(paramname, "$%d", j + 1);
            ri_GenerateQual(&qualbuf, qualsep,
                            paramname, pk_type,
                            riinfo->pf_eq_oprs[i],
                            attname, fk_type);
            querysep = ",";
            qualsep = "AND";
            queryoids[i] = pk_type;
            queryoids[j] = pk_type;
        }
        appendBinaryStringInfo(&querybuf, qualbuf.data, qualbuf.len);
 
        /* Prepare and save the plan */
        qplan = ri_PlanCheck(querybuf.data, riinfo->nkeys * 2, queryoids,
                             &qkey, fk_rel, pk_rel);
    }
 
    /*
     * We have a plan now. Run it to update the existing references.
     */
    ri_PerformCheck(riinfo, &qkey, qplan,
                    fk_rel, pk_rel,
                    oldslot, newslot,
                    false,
                    true,       /* must detect new rows */
                    SPI_OK_UPDATE);
 
    if (SPI_finish() != SPI_OK_FINISH)
        elog(ERROR, "SPI_finish failed");
 
    table_close(fk_rel, RowExclusiveLock);
 
    return PointerGetDatum(NULL);
}

References appendBinaryStringInfo(), appendStringInfo(), attname, elog, ERROR, fb(), i, initStringInfo(), j, MAX_QUOTED_NAME_LEN, MAX_QUOTED_REL_NAME_LEN, PointerGetDatum(), quoteOneName(), quoteRelationName(), ri_BuildQueryKey(), ri_CheckTrigger(), ri_FetchConstraintInfo(), ri_FetchPreparedPlan(), ri_GenerateQual(), RI_MAX_NUMKEYS, ri_PerformCheck(), RI_PLAN_CASCADE_ONUPDATE, ri_PlanCheck(), RI_TRIGTYPE_UPDATE, RIAttName, RIAttType, RowExclusiveLock, SPI_connect(), SPI_finish(), SPI_OK_FINISH, SPI_OK_UPDATE, sprintf, table_close(), table_open(), TriggerData::tg_newslot, TriggerData::tg_relation, TriggerData::tg_trigger, and TriggerData::tg_trigslot.

RI_FKey_check()

static Datum RI_FKey_check ( TriggerData *  trigdata )

static

Definition at line 357 of file ri_triggers.c.

{
    const RI_ConstraintInfo *riinfo;
    Relation    fk_rel;
    Relation    pk_rel;
    TupleTableSlot *newslot;
    RI_QueryKey qkey;
    SPIPlanPtr  qplan;
 
    riinfo = ri_FetchConstraintInfo(trigdata->tg_trigger,
                                    trigdata->tg_relation, false);
 
    if (TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
        newslot = trigdata->tg_newslot;
    else
        newslot = trigdata->tg_trigslot;
 
    /*
     * We should not even consider checking the row if it is no longer valid,
     * since it was either deleted (so the deferred check should be skipped)
     * or updated (in which case only the latest version of the row should be
     * checked).  Test its liveness according to SnapshotSelf.  We need pin
     * and lock on the buffer to call HeapTupleSatisfiesVisibility.  Caller
     * should be holding pin, but not lock.
     */
    if (!table_tuple_satisfies_snapshot(trigdata->tg_relation, newslot, SnapshotSelf))
        return PointerGetDatum(NULL);
 
    fk_rel = trigdata->tg_relation;
 
    switch (ri_NullCheck(RelationGetDescr(fk_rel), newslot, riinfo, false))
    {
        case RI_KEYS_ALL_NULL:
 
            /*
             * No further check needed - an all-NULL key passes every type of
             * foreign key constraint.
             */
            return PointerGetDatum(NULL);
 
        case RI_KEYS_SOME_NULL:
 
            /*
             * This is the only case that differs between the three kinds of
             * MATCH.
             */
            switch (riinfo->confmatchtype)
            {
                case FKCONSTR_MATCH_FULL:
 
                    /*
                     * Not allowed - MATCH FULL says either all or none of the
                     * attributes can be NULLs
                     */
                    ereport(ERROR,
                            (errcode(ERRCODE_FOREIGN_KEY_VIOLATION),
                             errmsg("insert or update on table \"%s\" violates foreign key constraint \"%s\"",
                                    RelationGetRelationName(fk_rel),
                                    NameStr(riinfo->conname)),
                             errdetail("MATCH FULL does not allow mixing of null and nonnull key values."),
                             errtableconstraint(fk_rel,
                                                NameStr(riinfo->conname))));
                    return PointerGetDatum(NULL);
 
                case FKCONSTR_MATCH_SIMPLE:
 
                    /*
                     * MATCH SIMPLE - if ANY column is null, the key passes
                     * the constraint.
                     */
                    return PointerGetDatum(NULL);
 
#ifdef NOT_USED
                case FKCONSTR_MATCH_PARTIAL:
 
                    /*
                     * MATCH PARTIAL - all non-null columns must match. (not
                     * implemented, can be done by modifying the query below
                     * to only include non-null columns, or by writing a
                     * special version here)
                     */
                    break;
#endif
            }
 
        case RI_KEYS_NONE_NULL:
 
            /*
             * Have a full qualified key - continue below for all three kinds
             * of MATCH.
             */
            break;
    }
 
    /*
     * Fast path: probe the PK unique index directly, bypassing SPI.
     *
     * For non-partitioned, non-temporal FKs, we can skip the SPI machinery
     * (plan cache, executor setup, etc.) and do a direct index scan + tuple
     * lock.  This is semantically equivalent to the SPI path below but avoids
     * the per-row executor overhead.
     *
     * ri_FastPathBatchAdd() and ri_FastPathCheck() report the violation
     * themselves if no matching PK row is found, so they only return on
     * success.
     */
    if (ri_fastpath_is_applicable(riinfo))
    {
        if (AfterTriggerIsActive())
        {
            /* Batched path: buffer and probe in groups */
            ri_FastPathBatchAdd(riinfo, fk_rel, newslot);
        }
        else
        {
            /* ALTER TABLE validation: per-row, no cache */
            ri_FastPathCheck(riinfo, fk_rel, newslot);
        }
        return PointerGetDatum(NULL);
    }
 
    SPI_connect();
 
    /*
     * pk_rel is opened in RowShareLock mode since that's what our eventual
     * SELECT FOR KEY SHARE will get on it.
     */
    pk_rel = table_open(riinfo->pk_relid, RowShareLock);
 
    /* Fetch or prepare a saved plan for the real check */
    ri_BuildQueryKey(&qkey, riinfo, RI_PLAN_CHECK_LOOKUPPK);
 
    if ((qplan = ri_FetchPreparedPlan(&qkey)) == NULL)
    {
        StringInfoData querybuf;
        char        pkrelname[MAX_QUOTED_REL_NAME_LEN];
        char        attname[MAX_QUOTED_NAME_LEN];
        char        paramname[16];
        const char *querysep;
        Oid         queryoids[RI_MAX_NUMKEYS];
        const char *pk_only;
 
        /* ----------
         * The query string built is
         *  SELECT 1 FROM [ONLY] <pktable> x WHERE pkatt1 = $1 [AND ...]
         *         FOR KEY SHARE OF x
         * The type id's for the $ parameters are those of the
         * corresponding FK attributes.
         *
         * But for temporal FKs we need to make sure
         * the FK's range is completely covered.
         * So we use this query instead:
         *  SELECT 1
         *  FROM    (
         *      SELECT pkperiodatt AS r
         *      FROM   [ONLY] pktable x
         *      WHERE  pkatt1 = $1 [AND ...]
         *      AND    pkperiodatt && $n
         *      FOR KEY SHARE OF x
         *  ) x1
         *  HAVING $n <@ range_agg(x1.r)
         * Note if FOR KEY SHARE ever allows GROUP BY and HAVING
         * we can make this a bit simpler.
         * ----------
         */
        initStringInfo(&querybuf);
        pk_only = pk_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ?
            "" : "ONLY ";
        quoteRelationName(pkrelname, pk_rel);
        if (riinfo->hasperiod)
        {
            quoteOneName(attname,
                         RIAttName(pk_rel, riinfo->pk_attnums[riinfo->nkeys - 1]));
 
            appendStringInfo(&querybuf,
                             "SELECT 1 FROM (SELECT %s AS r FROM %s%s x",
                             attname, pk_only, pkrelname);
        }
        else
        {
            appendStringInfo(&querybuf, "SELECT 1 FROM %s%s x",
                             pk_only, pkrelname);
        }
        querysep = "WHERE";
        for (int i = 0; i < riinfo->nkeys; i++)
        {
            Oid         pk_type = RIAttType(pk_rel, riinfo->pk_attnums[i]);
            Oid         fk_type = RIAttType(fk_rel, riinfo->fk_attnums[i]);
 
            quoteOneName(attname,
                         RIAttName(pk_rel, riinfo->pk_attnums[i]));
            sprintf(paramname, "$%d", i + 1);
            ri_GenerateQual(&querybuf, querysep,
                            attname, pk_type,
                            riinfo->pf_eq_oprs[i],
                            paramname, fk_type);
            querysep = "AND";
            queryoids[i] = fk_type;
        }
        appendStringInfoString(&querybuf, " FOR KEY SHARE OF x");
        if (riinfo->hasperiod)
        {
            Oid         fk_type = RIAttType(fk_rel, riinfo->fk_attnums[riinfo->nkeys - 1]);
 
            appendStringInfoString(&querybuf, ") x1 HAVING ");
            sprintf(paramname, "$%d", riinfo->nkeys);
            ri_GenerateQual(&querybuf, "",
                            paramname, fk_type,
                            riinfo->agged_period_contained_by_oper,
                            "pg_catalog.range_agg", ANYMULTIRANGEOID);
            appendStringInfoString(&querybuf, "(x1.r)");
        }
 
        /* Prepare and save the plan */
        qplan = ri_PlanCheck(querybuf.data, riinfo->nkeys, queryoids,
                             &qkey, fk_rel, pk_rel);
    }
 
    /*
     * Now check that foreign key exists in PK table
     *
     * XXX detectNewRows must be true when a partitioned table is on the
     * referenced side.  The reason is that our snapshot must be fresh in
     * order for the hack in find_inheritance_children() to work.
     */
    ri_PerformCheck(riinfo, &qkey, qplan,
                    fk_rel, pk_rel,
                    NULL, newslot,
                    false,
                    pk_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE,
                    SPI_OK_SELECT);
 
    if (SPI_finish() != SPI_OK_FINISH)
        elog(ERROR, "SPI_finish failed");
 
    table_close(pk_rel, RowShareLock);
 
    return PointerGetDatum(NULL);
}

References AfterTriggerIsActive(), appendStringInfo(), appendStringInfoString(), attname, elog, ereport, errcode(), errdetail(), errmsg, ERROR, errtableconstraint(), fb(), FKCONSTR_MATCH_FULL, FKCONSTR_MATCH_PARTIAL, FKCONSTR_MATCH_SIMPLE, i, initStringInfo(), MAX_QUOTED_NAME_LEN, MAX_QUOTED_REL_NAME_LEN, NameStr, PointerGetDatum(), quoteOneName(), quoteRelationName(), RelationData::rd_rel, RelationGetDescr, RelationGetRelationName, ri_BuildQueryKey(), ri_fastpath_is_applicable(), ri_FastPathBatchAdd(), ri_FastPathCheck(), ri_FetchConstraintInfo(), ri_FetchPreparedPlan(), ri_GenerateQual(), RI_KEYS_ALL_NULL, RI_KEYS_NONE_NULL, RI_KEYS_SOME_NULL, RI_MAX_NUMKEYS, ri_NullCheck(), ri_PerformCheck(), RI_PLAN_CHECK_LOOKUPPK, ri_PlanCheck(), RIAttName, RIAttType, RowShareLock, SnapshotSelf, SPI_connect(), SPI_finish(), SPI_OK_FINISH, SPI_OK_SELECT, sprintf, table_close(), table_open(), table_tuple_satisfies_snapshot(), TriggerData::tg_event, TriggerData::tg_newslot, TriggerData::tg_relation, TriggerData::tg_trigger, TriggerData::tg_trigslot, and TRIGGER_FIRED_BY_UPDATE.

Referenced by RI_FKey_check_ins(), and RI_FKey_check_upd().

RI_FKey_check_ins()

Datum RI_FKey_check_ins

(

PG_FUNCTION_ARGS

)

Definition at line 604 of file ri_triggers.c.

{
    /* Check that this is a valid trigger call on the right time and event. */
    ri_CheckTrigger(fcinfo, "RI_FKey_check_ins", RI_TRIGTYPE_INSERT);
 
    /* Share code with UPDATE case. */
    return RI_FKey_check((TriggerData *) fcinfo->context);
}

References ri_CheckTrigger(), RI_FKey_check(), and RI_TRIGTYPE_INSERT.

Referenced by validateForeignKeyConstraint().

RI_FKey_check_upd()

Datum RI_FKey_check_upd

(

PG_FUNCTION_ARGS

)

Definition at line 620 of file ri_triggers.c.

{
    /* Check that this is a valid trigger call on the right time and event. */
    ri_CheckTrigger(fcinfo, "RI_FKey_check_upd", RI_TRIGTYPE_UPDATE);
 
    /* Share code with INSERT case. */
    return RI_FKey_check((TriggerData *) fcinfo->context);
}

References ri_CheckTrigger(), RI_FKey_check(), and RI_TRIGTYPE_UPDATE.

RI_FKey_fk_upd_check_required()

bool RI_FKey_fk_upd_check_required	(	Trigger *	trigger,
		Relation	fk_rel,
		TupleTableSlot *	oldslot,
		TupleTableSlot *	newslot
	)

Definition at line 1548 of file ri_triggers.c.

{
    const RI_ConstraintInfo *riinfo;
    int         ri_nullcheck;
 
    /*
     * AfterTriggerSaveEvent() handles things such that this function is never
     * called for partitioned tables.
     */
    Assert(fk_rel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE);
 
    riinfo = ri_FetchConstraintInfo(trigger, fk_rel, false);
 
    ri_nullcheck = ri_NullCheck(RelationGetDescr(fk_rel), newslot, riinfo, false);
 
    /*
     * If all new key values are NULL, the row satisfies the constraint, so no
     * check is needed.
     */
    if (ri_nullcheck == RI_KEYS_ALL_NULL)
        return false;
 
    /*
     * If some new key values are NULL, the behavior depends on the match
     * type.
     */
    else if (ri_nullcheck == RI_KEYS_SOME_NULL)
    {
        switch (riinfo->confmatchtype)
        {
            case FKCONSTR_MATCH_SIMPLE:
 
                /*
                 * If any new key value is NULL, the row must satisfy the
                 * constraint, so no check is needed.
                 */
                return false;
 
            case FKCONSTR_MATCH_PARTIAL:
 
                /*
                 * Don't know, must run full check.
                 */
                break;
 
            case FKCONSTR_MATCH_FULL:
 
                /*
                 * If some new key values are NULL, the row fails the
                 * constraint.  We must not throw error here, because the row
                 * might get invalidated before the constraint is to be
                 * checked, but we should queue the event to apply the check
                 * later.
                 */
                return true;
        }
    }
 
    /*
     * Continues here for no new key values are NULL, or we couldn't decide
     * yet.
     */
 
    /*
     * If the original row was inserted by our own transaction, we must fire
     * the trigger whether or not the keys are equal.  This is because our
     * UPDATE will invalidate the INSERT so that the INSERT RI trigger will
     * not do anything; so we had better do the UPDATE check.  (We could skip
     * this if we knew the INSERT trigger already fired, but there is no easy
     * way to know that.)
     */
    if (slot_is_current_xact_tuple(oldslot))
        return true;
 
    /* If all old and new key values are equal, no check is needed */
    if (ri_KeysEqual(fk_rel, oldslot, newslot, riinfo, false))
        return false;
 
    /* Else we need to fire the trigger. */
    return true;
}

References Assert, fb(), FKCONSTR_MATCH_FULL, FKCONSTR_MATCH_PARTIAL, FKCONSTR_MATCH_SIMPLE, RelationGetDescr, ri_FetchConstraintInfo(), RI_KEYS_ALL_NULL, RI_KEYS_SOME_NULL, ri_KeysEqual(), ri_NullCheck(), and slot_is_current_xact_tuple().

Referenced by AfterTriggerSaveEvent().

RI_FKey_noaction_del()

Datum RI_FKey_noaction_del

(

PG_FUNCTION_ARGS

)

Definition at line 769 of file ri_triggers.c.

{
    /* Check that this is a valid trigger call on the right time and event. */
    ri_CheckTrigger(fcinfo, "RI_FKey_noaction_del", RI_TRIGTYPE_DELETE);
 
    /* Share code with RESTRICT/UPDATE cases. */
    return ri_restrict((TriggerData *) fcinfo->context, true);
}

References ri_CheckTrigger(), ri_restrict(), and RI_TRIGTYPE_DELETE.

RI_FKey_noaction_upd()

Datum RI_FKey_noaction_upd

(

PG_FUNCTION_ARGS

)

Definition at line 806 of file ri_triggers.c.

{
    /* Check that this is a valid trigger call on the right time and event. */
    ri_CheckTrigger(fcinfo, "RI_FKey_noaction_upd", RI_TRIGTYPE_UPDATE);
 
    /* Share code with RESTRICT/DELETE cases. */
    return ri_restrict((TriggerData *) fcinfo->context, true);
}

References ri_CheckTrigger(), ri_restrict(), and RI_TRIGTYPE_UPDATE.

RI_FKey_pk_upd_check_required()

bool RI_FKey_pk_upd_check_required	(	Trigger *	trigger,
		Relation	pk_rel,
		TupleTableSlot *	oldslot,
		TupleTableSlot *	newslot
	)

Definition at line 1516 of file ri_triggers.c.

{
    const RI_ConstraintInfo *riinfo;
 
    riinfo = ri_FetchConstraintInfo(trigger, pk_rel, true);
 
    /*
     * If any old key value is NULL, the row could not have been referenced by
     * an FK row, so no check is needed.
     */
    if (ri_NullCheck(RelationGetDescr(pk_rel), oldslot, riinfo, true) != RI_KEYS_NONE_NULL)
        return false;
 
    /* If all old and new key values are equal, no check is needed */
    if (newslot && ri_KeysEqual(pk_rel, oldslot, newslot, riinfo, true))
        return false;
 
    /* Else we need to fire the trigger. */
    return true;
}

References fb(), RelationGetDescr, ri_FetchConstraintInfo(), RI_KEYS_NONE_NULL, ri_KeysEqual(), and ri_NullCheck().

Referenced by AfterTriggerSaveEvent().

RI_FKey_restrict_del()

Datum RI_FKey_restrict_del

(

PG_FUNCTION_ARGS

)

Definition at line 789 of file ri_triggers.c.

{
    /* Check that this is a valid trigger call on the right time and event. */
    ri_CheckTrigger(fcinfo, "RI_FKey_restrict_del", RI_TRIGTYPE_DELETE);
 
    /* Share code with NO ACTION/UPDATE cases. */
    return ri_restrict((TriggerData *) fcinfo->context, false);
}

References ri_CheckTrigger(), ri_restrict(), and RI_TRIGTYPE_DELETE.

RI_FKey_restrict_upd()

Datum RI_FKey_restrict_upd

(

PG_FUNCTION_ARGS

)

Definition at line 826 of file ri_triggers.c.

{
    /* Check that this is a valid trigger call on the right time and event. */
    ri_CheckTrigger(fcinfo, "RI_FKey_restrict_upd", RI_TRIGTYPE_UPDATE);
 
    /* Share code with NO ACTION/DELETE cases. */
    return ri_restrict((TriggerData *) fcinfo->context, false);
}

References ri_CheckTrigger(), ri_restrict(), and RI_TRIGTYPE_UPDATE.

RI_FKey_setdefault_del()

Datum RI_FKey_setdefault_del

(

PG_FUNCTION_ARGS

)

Definition at line 1294 of file ri_triggers.c.

{
    /* Check that this is a valid trigger call on the right time and event. */
    ri_CheckTrigger(fcinfo, "RI_FKey_setdefault_del", RI_TRIGTYPE_DELETE);
 
    /* Share code with UPDATE case */
    return ri_set((TriggerData *) fcinfo->context, false, RI_TRIGTYPE_DELETE);
}

References ri_CheckTrigger(), ri_set(), and RI_TRIGTYPE_DELETE.

RI_FKey_setdefault_upd()

Datum RI_FKey_setdefault_upd

(

PG_FUNCTION_ARGS

)

Definition at line 1309 of file ri_triggers.c.

{
    /* Check that this is a valid trigger call on the right time and event. */
    ri_CheckTrigger(fcinfo, "RI_FKey_setdefault_upd", RI_TRIGTYPE_UPDATE);
 
    /* Share code with DELETE case */
    return ri_set((TriggerData *) fcinfo->context, false, RI_TRIGTYPE_UPDATE);
}

References ri_CheckTrigger(), ri_set(), and RI_TRIGTYPE_UPDATE.

RI_FKey_setnull_del()

Datum RI_FKey_setnull_del

(

PG_FUNCTION_ARGS

)

Definition at line 1264 of file ri_triggers.c.

{
    /* Check that this is a valid trigger call on the right time and event. */
    ri_CheckTrigger(fcinfo, "RI_FKey_setnull_del", RI_TRIGTYPE_DELETE);
 
    /* Share code with UPDATE case */
    return ri_set((TriggerData *) fcinfo->context, true, RI_TRIGTYPE_DELETE);
}

References ri_CheckTrigger(), ri_set(), and RI_TRIGTYPE_DELETE.

RI_FKey_setnull_upd()

Datum RI_FKey_setnull_upd

(

PG_FUNCTION_ARGS

)

Definition at line 1279 of file ri_triggers.c.

{
    /* Check that this is a valid trigger call on the right time and event. */
    ri_CheckTrigger(fcinfo, "RI_FKey_setnull_upd", RI_TRIGTYPE_UPDATE);
 
    /* Share code with DELETE case */
    return ri_set((TriggerData *) fcinfo->context, true, RI_TRIGTYPE_UPDATE);
}

References ri_CheckTrigger(), ri_set(), and RI_TRIGTYPE_UPDATE.

RI_FKey_trigger_type()

int RI_FKey_trigger_type

(

Oid

tgfoid

)

Definition at line 4074 of file ri_triggers.c.

{
    switch (tgfoid)
    {
        case F_RI_FKEY_CASCADE_DEL:
        case F_RI_FKEY_CASCADE_UPD:
        case F_RI_FKEY_RESTRICT_DEL:
        case F_RI_FKEY_RESTRICT_UPD:
        case F_RI_FKEY_SETNULL_DEL:
        case F_RI_FKEY_SETNULL_UPD:
        case F_RI_FKEY_SETDEFAULT_DEL:
        case F_RI_FKEY_SETDEFAULT_UPD:
        case F_RI_FKEY_NOACTION_DEL:
        case F_RI_FKEY_NOACTION_UPD:
            return RI_TRIGGER_PK;
 
        case F_RI_FKEY_CHECK_INS:
        case F_RI_FKEY_CHECK_UPD:
            return RI_TRIGGER_FK;
    }
 
    return RI_TRIGGER_NONE;
}

References fb(), RI_TRIGGER_FK, RI_TRIGGER_NONE, and RI_TRIGGER_PK.

Referenced by AfterTriggerSaveEvent(), ExecCrossPartitionUpdateForeignKey(), GetForeignKeyActionTriggers(), and GetForeignKeyCheckTriggers().

ri_GenerateQual()

static void ri_GenerateQual ( StringInfo  buf, const char *  sep, const char *  leftop, Oid  leftoptype, Oid  opoid, const char *  rightop, Oid  rightoptype  )

static

Definition at line 2198 of file ri_triggers.c.

{
    appendStringInfo(buf, " %s ", sep);
    generate_operator_clause(buf, leftop, leftoptype, opoid,
                             rightop, rightoptype);
}

References appendStringInfo(), buf, fb(), and generate_operator_clause().

Referenced by ri_Check_Pk_Match(), RI_FKey_cascade_del(), RI_FKey_cascade_upd(), RI_FKey_check(), RI_Initial_Check(), RI_PartitionRemove_Check(), ri_restrict(), and ri_set().

ri_GenerateQualCollation()

static void ri_GenerateQualCollation ( StringInfo  buf, Oid  collation  )

static

Definition at line 2225 of file ri_triggers.c.

{
    HeapTuple   tp;
    Form_pg_collation colltup;
    char       *collname;
    char        onename[MAX_QUOTED_NAME_LEN];
 
    /* Nothing to do if it's a noncollatable data type */
    if (!OidIsValid(collation))
        return;
 
    tp = SearchSysCache1(COLLOID, ObjectIdGetDatum(collation));
    if (!HeapTupleIsValid(tp))
        elog(ERROR, "cache lookup failed for collation %u", collation);
    colltup = (Form_pg_collation) GETSTRUCT(tp);
    collname = NameStr(colltup->collname);
 
    /*
     * We qualify the name always, for simplicity and to ensure the query is
     * not search-path-dependent.
     */
    quoteOneName(onename, get_namespace_name(colltup->collnamespace));
    appendStringInfo(buf, " COLLATE %s", onename);
    quoteOneName(onename, collname);
    appendStringInfo(buf, ".%s", onename);
 
    ReleaseSysCache(tp);
}

References appendStringInfo(), buf, elog, ERROR, fb(), Form_pg_collation, get_namespace_name(), GETSTRUCT(), HeapTupleIsValid, MAX_QUOTED_NAME_LEN, NameStr, ObjectIdGetDatum(), OidIsValid, quoteOneName(), ReleaseSysCache(), and SearchSysCache1().

Referenced by RI_Initial_Check(), and RI_PartitionRemove_Check().

ri_HashCompareOp()

static RI_CompareHashEntry * ri_HashCompareOp ( Oid  eq_opr, Oid  typeid  )

static

Definition at line 3975 of file ri_triggers.c.

{
    RI_CompareKey key;
    RI_CompareHashEntry *entry;
    bool        found;
 
    /*
     * On the first call initialize the hashtable
     */
    if (!ri_compare_cache)
        ri_InitHashTables();
 
    /*
     * Find or create a hash entry.  Note we're assuming RI_CompareKey
     * contains no struct padding.
     */
    key.eq_opr = eq_opr;
    key.typeid = typeid;
    entry = (RI_CompareHashEntry *) hash_search(ri_compare_cache,
                                                &key,
                                                HASH_ENTER, &found);
    if (!found)
        entry->valid = false;
 
    /*
     * If not already initialized, do so.  Since we'll keep this hash entry
     * for the life of the backend, put any subsidiary info for the function
     * cache structs into TopMemoryContext.
     */
    if (!entry->valid)
    {
        Oid         lefttype,
                    righttype,
                    castfunc;
        CoercionPathType pathtype;
 
        /* We always need to know how to call the equality operator */
        fmgr_info_cxt(get_opcode(eq_opr), &entry->eq_opr_finfo,
                      TopMemoryContext);
 
        /*
         * If we chose to use a cast from FK to PK type, we may have to apply
         * the cast function to get to the operator's input type.
         *
         * XXX eventually it would be good to support array-coercion cases
         * here and in ri_CompareWithCast().  At the moment there is no point
         * because cases involving nonidentical array types will be rejected
         * at constraint creation time.
         *
         * XXX perhaps also consider supporting CoerceViaIO?  No need at the
         * moment since that will never be generated for implicit coercions.
         */
        op_input_types(eq_opr, &lefttype, &righttype);
 
        /*
         * pf_eq_oprs (used by the fast path) can be cross-type when the FK
         * and PK columns differ in type, e.g. int48eq for int4 PK / int8 FK.
         * If the FK column's type already matches what the operator expects
         * as its right-hand input, no cast is needed.
         */
        if (typeid == righttype)
            castfunc = InvalidOid;  /* simplest case */
        else
        {
            pathtype = find_coercion_pathway(lefttype, typeid,
                                             COERCION_IMPLICIT,
                                             &castfunc);
            if (pathtype != COERCION_PATH_FUNC &&
                pathtype != COERCION_PATH_RELABELTYPE)
            {
                /*
                 * The declared input type of the eq_opr might be a
                 * polymorphic type such as ANYARRAY or ANYENUM, or other
                 * special cases such as RECORD; find_coercion_pathway
                 * currently doesn't subsume these special cases.
                 */
                if (!IsBinaryCoercible(typeid, lefttype))
                    elog(ERROR, "no conversion function from %s to %s",
                         format_type_be(typeid),
                         format_type_be(lefttype));
            }
        }
        if (OidIsValid(castfunc))
            fmgr_info_cxt(castfunc, &entry->cast_func_finfo,
                          TopMemoryContext);
        else
            entry->cast_func_finfo.fn_oid = InvalidOid;
        entry->valid = true;
    }
 
    return entry;
}

References RI_CompareHashEntry::cast_func_finfo, COERCION_IMPLICIT, COERCION_PATH_FUNC, COERCION_PATH_RELABELTYPE, elog, RI_CompareHashEntry::eq_opr_finfo, ERROR, find_coercion_pathway(), fmgr_info_cxt(), FmgrInfo::fn_oid, format_type_be(), get_opcode(), HASH_ENTER, hash_search(), InvalidOid, IsBinaryCoercible(), OidIsValid, op_input_types(), ri_compare_cache, ri_InitHashTables(), TopMemoryContext, and RI_CompareHashEntry::valid.

Referenced by ri_CompareWithCast(), and ri_populate_fastpath_metadata().

ri_HashPreparedPlan()

static void ri_HashPreparedPlan ( RI_QueryKey *  key, SPIPlanPtr  plan  )

static

Definition at line 3803 of file ri_triggers.c.

{
    RI_QueryHashEntry *entry;
    bool        found;
 
    /*
     * On the first call initialize the hashtable
     */
    if (!ri_query_cache)
        ri_InitHashTables();
 
    /*
     * Add the new plan.  We might be overwriting an entry previously found
     * invalid by ri_FetchPreparedPlan.
     */
    entry = (RI_QueryHashEntry *) hash_search(ri_query_cache,
                                              key,
                                              HASH_ENTER, &found);
    Assert(!found || entry->plan == NULL);
    entry->plan = plan;
}

References Assert, fb(), HASH_ENTER, hash_search(), RI_QueryHashEntry::plan, plan, ri_InitHashTables(), and ri_query_cache.

Referenced by ri_PlanCheck().

ri_InitHashTables()

static void ri_InitHashTables ( void  )

static

Definition at line 3715 of file ri_triggers.c.

{
    HASHCTL     ctl;
 
    ctl.keysize = sizeof(Oid);
    ctl.entrysize = sizeof(RI_ConstraintInfo);
    ri_constraint_cache = hash_create("RI constraint cache",
                                      RI_INIT_CONSTRAINTHASHSIZE,
                                      &ctl, HASH_ELEM | HASH_BLOBS);
 
    /* Arrange to flush cache on pg_constraint changes */
    CacheRegisterSyscacheCallback(CONSTROID,
                                  InvalidateConstraintCacheCallBack,
                                  (Datum) 0);
 
    ctl.keysize = sizeof(RI_QueryKey);
    ctl.entrysize = sizeof(RI_QueryHashEntry);
    ri_query_cache = hash_create("RI query cache",
                                 RI_INIT_QUERYHASHSIZE,
                                 &ctl, HASH_ELEM | HASH_BLOBS);
 
    ctl.keysize = sizeof(RI_CompareKey);
    ctl.entrysize = sizeof(RI_CompareHashEntry);
    ri_compare_cache = hash_create("RI compare cache",
                                   RI_INIT_QUERYHASHSIZE,
                                   &ctl, HASH_ELEM | HASH_BLOBS);
}

References CacheRegisterSyscacheCallback(), ctl, fb(), HASH_BLOBS, hash_create(), HASH_ELEM, InvalidateConstraintCacheCallBack(), HASHCTL::keysize, ri_compare_cache, ri_constraint_cache, RI_INIT_CONSTRAINTHASHSIZE, RI_INIT_QUERYHASHSIZE, and ri_query_cache.

Referenced by ri_FetchPreparedPlan(), ri_HashCompareOp(), ri_HashPreparedPlan(), and ri_LoadConstraintInfo().

RI_Initial_Check()

bool RI_Initial_Check	(	Trigger *	trigger,
		Relation	fk_rel,
		Relation	pk_rel
	)

Definition at line 1649 of file ri_triggers.c.

{
    const RI_ConstraintInfo *riinfo;
    StringInfoData querybuf;
    char        pkrelname[MAX_QUOTED_REL_NAME_LEN];
    char        fkrelname[MAX_QUOTED_REL_NAME_LEN];
    char        pkattname[MAX_QUOTED_NAME_LEN + 3];
    char        fkattname[MAX_QUOTED_NAME_LEN + 3];
    RangeTblEntry *rte;
    RTEPermissionInfo *pk_perminfo;
    RTEPermissionInfo *fk_perminfo;
    List       *rtes = NIL;
    List       *perminfos = NIL;
    const char *sep;
    const char *fk_only;
    const char *pk_only;
    int         save_nestlevel;
    char        workmembuf[32];
    int         spi_result;
    SPIPlanPtr  qplan;
 
    riinfo = ri_FetchConstraintInfo(trigger, fk_rel, false);
 
    /*
     * Check to make sure current user has enough permissions to do the test
     * query.  (If not, caller can fall back to the trigger method, which
     * works because it changes user IDs on the fly.)
     *
     * XXX are there any other show-stopper conditions to check?
     */
    pk_perminfo = makeNode(RTEPermissionInfo);
    pk_perminfo->relid = RelationGetRelid(pk_rel);
    pk_perminfo->requiredPerms = ACL_SELECT;
    perminfos = lappend(perminfos, pk_perminfo);
    rte = makeNode(RangeTblEntry);
    rte->rtekind = RTE_RELATION;
    rte->relid = RelationGetRelid(pk_rel);
    rte->relkind = pk_rel->rd_rel->relkind;
    rte->rellockmode = AccessShareLock;
    rte->perminfoindex = list_length(perminfos);
    rtes = lappend(rtes, rte);
 
    fk_perminfo = makeNode(RTEPermissionInfo);
    fk_perminfo->relid = RelationGetRelid(fk_rel);
    fk_perminfo->requiredPerms = ACL_SELECT;
    perminfos = lappend(perminfos, fk_perminfo);
    rte = makeNode(RangeTblEntry);
    rte->rtekind = RTE_RELATION;
    rte->relid = RelationGetRelid(fk_rel);
    rte->relkind = fk_rel->rd_rel->relkind;
    rte->rellockmode = AccessShareLock;
    rte->perminfoindex = list_length(perminfos);
    rtes = lappend(rtes, rte);
 
    for (int i = 0; i < riinfo->nkeys; i++)
    {
        int         attno;
 
        attno = riinfo->pk_attnums[i] - FirstLowInvalidHeapAttributeNumber;
        pk_perminfo->selectedCols = bms_add_member(pk_perminfo->selectedCols, attno);
 
        attno = riinfo->fk_attnums[i] - FirstLowInvalidHeapAttributeNumber;
        fk_perminfo->selectedCols = bms_add_member(fk_perminfo->selectedCols, attno);
    }
 
    if (!ExecCheckPermissions(rtes, perminfos, false))
        return false;
 
    /*
     * Also punt if RLS is enabled on either table unless this role has the
     * bypassrls right or is the table owner of the table(s) involved which
     * have RLS enabled.
     */
    if (!has_bypassrls_privilege(GetUserId()) &&
        ((pk_rel->rd_rel->relrowsecurity &&
          !object_ownercheck(RelationRelationId, RelationGetRelid(pk_rel),
                             GetUserId())) ||
         (fk_rel->rd_rel->relrowsecurity &&
          !object_ownercheck(RelationRelationId, RelationGetRelid(fk_rel),
                             GetUserId()))))
        return false;
 
    /*----------
     * The query string built is:
     *  SELECT fk.keycols FROM [ONLY] relname fk
     *   LEFT OUTER JOIN [ONLY] pkrelname pk
     *   ON (pk.pkkeycol1=fk.keycol1 [AND ...])
     *   WHERE pk.pkkeycol1 IS NULL AND
     * For MATCH SIMPLE:
     *   (fk.keycol1 IS NOT NULL [AND ...])
     * For MATCH FULL:
     *   (fk.keycol1 IS NOT NULL [OR ...])
     *
     * We attach COLLATE clauses to the operators when comparing columns
     * that have different collations.
     *----------
     */
    initStringInfo(&querybuf);
    appendStringInfoString(&querybuf, "SELECT ");
    sep = "";
    for (int i = 0; i < riinfo->nkeys; i++)
    {
        quoteOneName(fkattname,
                     RIAttName(fk_rel, riinfo->fk_attnums[i]));
        appendStringInfo(&querybuf, "%sfk.%s", sep, fkattname);
        sep = ", ";
    }
 
    quoteRelationName(pkrelname, pk_rel);
    quoteRelationName(fkrelname, fk_rel);
    fk_only = fk_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ?
        "" : "ONLY ";
    pk_only = pk_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ?
        "" : "ONLY ";
    appendStringInfo(&querybuf,
                     " FROM %s%s fk LEFT OUTER JOIN %s%s pk ON",
                     fk_only, fkrelname, pk_only, pkrelname);
 
    strcpy(pkattname, "pk.");
    strcpy(fkattname, "fk.");
    sep = "(";
    for (int i = 0; i < riinfo->nkeys; i++)
    {
        Oid         pk_type = RIAttType(pk_rel, riinfo->pk_attnums[i]);
        Oid         fk_type = RIAttType(fk_rel, riinfo->fk_attnums[i]);
        Oid         pk_coll = RIAttCollation(pk_rel, riinfo->pk_attnums[i]);
        Oid         fk_coll = RIAttCollation(fk_rel, riinfo->fk_attnums[i]);
 
        quoteOneName(pkattname + 3,
                     RIAttName(pk_rel, riinfo->pk_attnums[i]));
        quoteOneName(fkattname + 3,
                     RIAttName(fk_rel, riinfo->fk_attnums[i]));
        ri_GenerateQual(&querybuf, sep,
                        pkattname, pk_type,
                        riinfo->pf_eq_oprs[i],
                        fkattname, fk_type);
        if (pk_coll != fk_coll)
            ri_GenerateQualCollation(&querybuf, pk_coll);
        sep = "AND";
    }
 
    /*
     * It's sufficient to test any one pk attribute for null to detect a join
     * failure.
     */
    quoteOneName(pkattname, RIAttName(pk_rel, riinfo->pk_attnums[0]));
    appendStringInfo(&querybuf, ") WHERE pk.%s IS NULL AND (", pkattname);
 
    sep = "";
    for (int i = 0; i < riinfo->nkeys; i++)
    {
        quoteOneName(fkattname, RIAttName(fk_rel, riinfo->fk_attnums[i]));
        appendStringInfo(&querybuf,
                         "%sfk.%s IS NOT NULL",
                         sep, fkattname);
        switch (riinfo->confmatchtype)
        {
            case FKCONSTR_MATCH_SIMPLE:
                sep = " AND ";
                break;
            case FKCONSTR_MATCH_FULL:
                sep = " OR ";
                break;
        }
    }
    appendStringInfoChar(&querybuf, ')');
 
    /*
     * Temporarily increase work_mem so that the check query can be executed
     * more efficiently.  It seems okay to do this because the query is simple
     * enough to not use a multiple of work_mem, and one typically would not
     * have many large foreign-key validations happening concurrently.  So
     * this seems to meet the criteria for being considered a "maintenance"
     * operation, and accordingly we use maintenance_work_mem.  However, we
     * must also set hash_mem_multiplier to 1, since it is surely not okay to
     * let that get applied to the maintenance_work_mem value.
     *
     * We use the equivalent of a function SET option to allow the setting to
     * persist for exactly the duration of the check query.  guc.c also takes
     * care of undoing the setting on error.
     */
    save_nestlevel = NewGUCNestLevel();
 
    snprintf(workmembuf, sizeof(workmembuf), "%d", maintenance_work_mem);
    (void) set_config_option("work_mem", workmembuf,
                             PGC_USERSET, PGC_S_SESSION,
                             GUC_ACTION_SAVE, true, 0, false);
    (void) set_config_option("hash_mem_multiplier", "1",
                             PGC_USERSET, PGC_S_SESSION,
                             GUC_ACTION_SAVE, true, 0, false);
 
    SPI_connect();
 
    /*
     * Generate the plan.  We don't need to cache it, and there are no
     * arguments to the plan.
     */
    qplan = SPI_prepare(querybuf.data, 0, NULL);
 
    if (qplan == NULL)
        elog(ERROR, "SPI_prepare returned %s for %s",
             SPI_result_code_string(SPI_result), querybuf.data);
 
    /*
     * Run the plan.  For safety we force a current snapshot to be used. (In
     * transaction-snapshot mode, this arguably violates transaction isolation
     * rules, but we really haven't got much choice.) We don't need to
     * register the snapshot, because SPI_execute_snapshot will see to it. We
     * need at most one tuple returned, so pass limit = 1.
     */
    spi_result = SPI_execute_snapshot(qplan,
                                      NULL, NULL,
                                      GetLatestSnapshot(),
                                      InvalidSnapshot,
                                      true, false, 1);
 
    /* Check result */
    if (spi_result != SPI_OK_SELECT)
        elog(ERROR, "SPI_execute_snapshot returned %s", SPI_result_code_string(spi_result));
 
    /* Did we find a tuple violating the constraint? */
    if (SPI_processed > 0)
    {
        TupleTableSlot *slot;
        HeapTuple   tuple = SPI_tuptable->vals[0];
        TupleDesc   tupdesc = SPI_tuptable->tupdesc;
        RI_ConstraintInfo fake_riinfo;
 
        slot = MakeSingleTupleTableSlot(tupdesc, &TTSOpsVirtual);
 
        heap_deform_tuple(tuple, tupdesc,
                          slot->tts_values, slot->tts_isnull);
        ExecStoreVirtualTuple(slot);
 
        /*
         * The columns to look at in the result tuple are 1..N, not whatever
         * they are in the fk_rel.  Hack up riinfo so that the subroutines
         * called here will behave properly.
         *
         * In addition to this, we have to pass the correct tupdesc to
         * ri_ReportViolation, overriding its normal habit of using the pk_rel
         * or fk_rel's tupdesc.
         */
        memcpy(&fake_riinfo, riinfo, sizeof(RI_ConstraintInfo));
        for (int i = 0; i < fake_riinfo.nkeys; i++)
            fake_riinfo.fk_attnums[i] = i + 1;
 
        /*
         * If it's MATCH FULL, and there are any nulls in the FK keys,
         * complain about that rather than the lack of a match.  MATCH FULL
         * disallows partially-null FK rows.
         */
        if (fake_riinfo.confmatchtype == FKCONSTR_MATCH_FULL &&
            ri_NullCheck(tupdesc, slot, &fake_riinfo, false) != RI_KEYS_NONE_NULL)
            ereport(ERROR,
                    (errcode(ERRCODE_FOREIGN_KEY_VIOLATION),
                     errmsg("insert or update on table \"%s\" violates foreign key constraint \"%s\"",
                            RelationGetRelationName(fk_rel),
                            NameStr(fake_riinfo.conname)),
                     errdetail("MATCH FULL does not allow mixing of null and nonnull key values."),
                     errtableconstraint(fk_rel,
                                        NameStr(fake_riinfo.conname))));
 
        /*
         * We tell ri_ReportViolation we were doing the RI_PLAN_CHECK_LOOKUPPK
         * query, which isn't true, but will cause it to use
         * fake_riinfo.fk_attnums as we need.
         */
        ri_ReportViolation(&fake_riinfo,
                           pk_rel, fk_rel,
                           slot, tupdesc,
                           RI_PLAN_CHECK_LOOKUPPK, false, false);
 
        ExecDropSingleTupleTableSlot(slot);
    }
 
    if (SPI_finish() != SPI_OK_FINISH)
        elog(ERROR, "SPI_finish failed");
 
    /*
     * Restore work_mem and hash_mem_multiplier.
     */
    AtEOXact_GUC(true, save_nestlevel);
 
    return true;
}

References AccessShareLock, ACL_SELECT, appendStringInfo(), appendStringInfoChar(), appendStringInfoString(), AtEOXact_GUC(), bms_add_member(), elog, ereport, errcode(), errdetail(), errmsg, ERROR, errtableconstraint(), ExecCheckPermissions(), ExecDropSingleTupleTableSlot(), ExecStoreVirtualTuple(), fb(), FirstLowInvalidHeapAttributeNumber, FKCONSTR_MATCH_FULL, FKCONSTR_MATCH_SIMPLE, GetLatestSnapshot(), GetUserId(), GUC_ACTION_SAVE, has_bypassrls_privilege(), heap_deform_tuple(), i, initStringInfo(), InvalidSnapshot, lappend(), list_length(), maintenance_work_mem, makeNode, MakeSingleTupleTableSlot(), MAX_QUOTED_NAME_LEN, MAX_QUOTED_REL_NAME_LEN, memcpy(), NameStr, NewGUCNestLevel(), NIL, object_ownercheck(), PGC_S_SESSION, PGC_USERSET, quoteOneName(), quoteRelationName(), RelationData::rd_rel, RelationGetRelationName, RelationGetRelid, ri_FetchConstraintInfo(), ri_GenerateQual(), ri_GenerateQualCollation(), RI_KEYS_NONE_NULL, ri_NullCheck(), RI_PLAN_CHECK_LOOKUPPK, ri_ReportViolation(), RIAttCollation, RIAttName, RIAttType, RTE_RELATION, set_config_option(), snprintf, SPI_connect(), SPI_execute_snapshot(), SPI_finish(), SPI_OK_FINISH, SPI_OK_SELECT, SPI_prepare(), SPI_processed, SPI_result, SPI_result_code_string(), SPI_tuptable, TupleTableSlot::tts_isnull, TupleTableSlot::tts_values, TTSOpsVirtual, SPITupleTable::tupdesc, and SPITupleTable::vals.

Referenced by validateForeignKeyConstraint().

ri_KeysEqual()

static bool ri_KeysEqual ( Relation  rel, TupleTableSlot *  oldslot, TupleTableSlot *  newslot, const RI_ConstraintInfo *  riinfo, bool  rel_is_pk  )

static

Definition at line 3840 of file ri_triggers.c.

{
    const int16 *attnums;
 
    if (rel_is_pk)
        attnums = riinfo->pk_attnums;
    else
        attnums = riinfo->fk_attnums;
 
    /* XXX: could be worthwhile to fetch all necessary attrs at once */
    for (int i = 0; i < riinfo->nkeys; i++)
    {
        Datum       oldvalue;
        Datum       newvalue;
        bool        isnull;
 
        /*
         * Get one attribute's oldvalue. If it is NULL - they're not equal.
         */
        oldvalue = slot_getattr(oldslot, attnums[i], &isnull);
        if (isnull)
            return false;
 
        /*
         * Get one attribute's newvalue. If it is NULL - they're not equal.
         */
        newvalue = slot_getattr(newslot, attnums[i], &isnull);
        if (isnull)
            return false;
 
        if (rel_is_pk)
        {
            /*
             * If we are looking at the PK table, then do a bytewise
             * comparison.  We must propagate PK changes if the value is
             * changed to one that "looks" different but would compare as
             * equal using the equality operator.  This only makes a
             * difference for ON UPDATE CASCADE, but for consistency we treat
             * all changes to the PK the same.
             */
            CompactAttribute *att = TupleDescCompactAttr(oldslot->tts_tupleDescriptor, attnums[i] - 1);
 
            if (!datum_image_eq(oldvalue, newvalue, att->attbyval, att->attlen))
                return false;
        }
        else
        {
            Oid         eq_opr;
 
            /*
             * When comparing the PERIOD columns we can skip the check
             * whenever the referencing column stayed equal or shrank, so test
             * with the contained-by operator instead.
             */
            if (riinfo->hasperiod && i == riinfo->nkeys - 1)
                eq_opr = riinfo->period_contained_by_oper;
            else
                eq_opr = riinfo->ff_eq_oprs[i];
 
            /*
             * For the FK table, compare with the appropriate equality
             * operator.  Changes that compare equal will still satisfy the
             * constraint after the update.
             */
            if (!ri_CompareWithCast(eq_opr, RIAttType(rel, attnums[i]), RIAttCollation(rel, attnums[i]),
                                    newvalue, oldvalue))
                return false;
        }
    }
 
    return true;
}

References CompactAttribute::attbyval, CompactAttribute::attlen, datum_image_eq(), fb(), i, ri_CompareWithCast(), RIAttCollation, RIAttType, slot_getattr(), and TupleDescCompactAttr().

Referenced by RI_FKey_fk_upd_check_required(), and RI_FKey_pk_upd_check_required().

ri_LoadConstraintInfo()

static const RI_ConstraintInfo * ri_LoadConstraintInfo ( Oid  constraintOid )

static

Definition at line 2398 of file ri_triggers.c.

{
    RI_ConstraintInfo *riinfo;
    bool        found;
    HeapTuple   tup;
    Form_pg_constraint conForm;
 
    /*
     * On the first call initialize the hashtable
     */
    if (!ri_constraint_cache)
        ri_InitHashTables();
 
    /*
     * Find or create a hash entry.  If we find a valid one, just return it.
     */
    riinfo = (RI_ConstraintInfo *) hash_search(ri_constraint_cache,
                                               &constraintOid,
                                               HASH_ENTER, &found);
    if (!found)
        riinfo->valid = false;
    else if (riinfo->valid)
        return riinfo;
 
    /*
     * Fetch the pg_constraint row so we can fill in the entry.
     */
    tup = SearchSysCache1(CONSTROID, ObjectIdGetDatum(constraintOid));
    if (!HeapTupleIsValid(tup)) /* should not happen */
        elog(ERROR, "cache lookup failed for constraint %u", constraintOid);
    conForm = (Form_pg_constraint) GETSTRUCT(tup);
 
    if (conForm->contype != CONSTRAINT_FOREIGN) /* should not happen */
        elog(ERROR, "constraint %u is not a foreign key constraint",
             constraintOid);
 
    /* And extract data */
    Assert(riinfo->constraint_id == constraintOid);
    if (OidIsValid(conForm->conparentid))
        riinfo->constraint_root_id =
            get_ri_constraint_root(conForm->conparentid);
    else
        riinfo->constraint_root_id = constraintOid;
    riinfo->oidHashValue = GetSysCacheHashValue1(CONSTROID,
                                                 ObjectIdGetDatum(constraintOid));
    riinfo->rootHashValue = GetSysCacheHashValue1(CONSTROID,
                                                  ObjectIdGetDatum(riinfo->constraint_root_id));
    memcpy(&riinfo->conname, &conForm->conname, sizeof(NameData));
    riinfo->pk_relid = conForm->confrelid;
    riinfo->fk_relid = conForm->conrelid;
    riinfo->confupdtype = conForm->confupdtype;
    riinfo->confdeltype = conForm->confdeltype;
    riinfo->confmatchtype = conForm->confmatchtype;
    riinfo->hasperiod = conForm->conperiod;
 
    DeconstructFkConstraintRow(tup,
                               &riinfo->nkeys,
                               riinfo->fk_attnums,
                               riinfo->pk_attnums,
                               riinfo->pf_eq_oprs,
                               riinfo->pp_eq_oprs,
                               riinfo->ff_eq_oprs,
                               &riinfo->ndelsetcols,
                               riinfo->confdelsetcols);
 
    /*
     * For temporal FKs, get the operators and functions we need. We ask the
     * opclass of the PK element for these. This all gets cached (as does the
     * generated plan), so there's no performance issue.
     */
    if (riinfo->hasperiod)
    {
        Oid         opclass = get_index_column_opclass(conForm->conindid, riinfo->nkeys);
 
        FindFKPeriodOpers(opclass,
                          &riinfo->period_contained_by_oper,
                          &riinfo->agged_period_contained_by_oper,
                          &riinfo->period_intersect_oper);
    }
 
    /* Metadata used by fast path. */
    riinfo->conindid = conForm->conindid;
    riinfo->pk_is_partitioned =
        (get_rel_relkind(riinfo->pk_relid) == RELKIND_PARTITIONED_TABLE);
 
    ReleaseSysCache(tup);
 
    /*
     * For efficient processing of invalidation messages below, we keep a
     * doubly-linked count list of all currently valid entries.
     */
    dclist_push_tail(&ri_constraint_cache_valid_list, &riinfo->valid_link);
 
    riinfo->valid = true;
 
    riinfo->fpmeta = NULL;
 
    return riinfo;
}

References Assert, dclist_push_tail(), DeconstructFkConstraintRow(), elog, ERROR, fb(), FindFKPeriodOpers(), Form_pg_constraint, get_index_column_opclass(), get_rel_relkind(), get_ri_constraint_root(), GETSTRUCT(), GetSysCacheHashValue1, HASH_ENTER, hash_search(), HeapTupleIsValid, memcpy(), ObjectIdGetDatum(), OidIsValid, ReleaseSysCache(), ri_constraint_cache, ri_constraint_cache_valid_list, ri_InitHashTables(), and SearchSysCache1().

Referenced by ri_FastPathBatchFlush(), ri_FastPathCheck(), ri_FastPathEndBatch(), and ri_FetchConstraintInfo().

ri_LockPKTuple()

static bool ri_LockPKTuple ( Relation  pk_rel, TupleTableSlot *  slot, Snapshot  snap, bool *  concurrently_updated  )

static

Definition at line 3217 of file ri_triggers.c.

{
    TM_FailureData tmfd;
    TM_Result   result;
    int         lockflags = TUPLE_LOCK_FLAG_LOCK_UPDATE_IN_PROGRESS;
 
    *concurrently_updated = false;
 
    if (!IsolationUsesXactSnapshot())
        lockflags |= TUPLE_LOCK_FLAG_FIND_LAST_VERSION;
 
    result = table_tuple_lock(pk_rel, &slot->tts_tid, snap,
                              slot, GetCurrentCommandId(false),
                              LockTupleKeyShare, LockWaitBlock,
                              lockflags, &tmfd);
 
    switch (result)
    {
        case TM_Ok:
            if (tmfd.traversed)
                *concurrently_updated = true;
            return true;
 
        case TM_Deleted:
            if (IsolationUsesXactSnapshot())
                ereport(ERROR,
                        (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
                         errmsg("could not serialize access due to concurrent update")));
            return false;
 
        case TM_Updated:
            if (IsolationUsesXactSnapshot())
                ereport(ERROR,
                        (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
                         errmsg("could not serialize access due to concurrent update")));
 
            /*
             * In READ COMMITTED, FIND_LAST_VERSION should have chased the
             * chain and returned TM_Ok.  Getting here means something
             * unexpected -- fall through to error.
             */
            elog(ERROR, "unexpected table_tuple_lock status: %u", result);
            break;
 
        case TM_SelfModified:
 
            /*
             * The current command or a later command in this transaction
             * modified the PK row.  This shouldn't normally happen during an
             * FK check (we're not modifying pk_rel), but handle it safely by
             * treating the tuple as not found.
             */
            return false;
 
        case TM_Invisible:
            elog(ERROR, "attempted to lock invisible tuple");
            break;
 
        default:
            elog(ERROR, "unrecognized table_tuple_lock status: %u", result);
            break;
    }
 
    return false;               /* keep compiler quiet */
}

References elog, ereport, errcode(), ERRCODE_T_R_SERIALIZATION_FAILURE, errmsg, ERROR, fb(), GetCurrentCommandId(), IsolationUsesXactSnapshot, LockTupleKeyShare, LockWaitBlock, result, table_tuple_lock(), TM_Deleted, TM_Invisible, TM_Ok, TM_SelfModified, TM_Updated, TM_FailureData::traversed, TupleTableSlot::tts_tid, TUPLE_LOCK_FLAG_FIND_LAST_VERSION, and TUPLE_LOCK_FLAG_LOCK_UPDATE_IN_PROGRESS.

Referenced by ri_FastPathFlushArray(), and ri_FastPathProbeOne().

ri_NullCheck()

static int ri_NullCheck ( TupleDesc  tupDesc, TupleTableSlot *  slot, const RI_ConstraintInfo *  riinfo, bool  rel_is_pk  )

static

Definition at line 3678 of file ri_triggers.c.

{
    const int16 *attnums;
    bool        allnull = true;
    bool        nonenull = true;
 
    if (rel_is_pk)
        attnums = riinfo->pk_attnums;
    else
        attnums = riinfo->fk_attnums;
 
    for (int i = 0; i < riinfo->nkeys; i++)
    {
        if (slot_attisnull(slot, attnums[i]))
            nonenull = false;
        else
            allnull = false;
    }
 
    if (allnull)
        return RI_KEYS_ALL_NULL;
 
    if (nonenull)
        return RI_KEYS_NONE_NULL;
 
    return RI_KEYS_SOME_NULL;
}

References fb(), i, RI_KEYS_ALL_NULL, RI_KEYS_NONE_NULL, RI_KEYS_SOME_NULL, and slot_attisnull().

Referenced by ri_Check_Pk_Match(), RI_FKey_check(), RI_FKey_fk_upd_check_required(), RI_FKey_pk_upd_check_required(), and RI_Initial_Check().

RI_PartitionRemove_Check()

void RI_PartitionRemove_Check	(	Trigger *	trigger,
		Relation	fk_rel,
		Relation	pk_rel
	)

Definition at line 1943 of file ri_triggers.c.

{
    const RI_ConstraintInfo *riinfo;
    StringInfoData querybuf;
    char       *constraintDef;
    char        pkrelname[MAX_QUOTED_REL_NAME_LEN];
    char        fkrelname[MAX_QUOTED_REL_NAME_LEN];
    char        pkattname[MAX_QUOTED_NAME_LEN + 3];
    char        fkattname[MAX_QUOTED_NAME_LEN + 3];
    const char *sep;
    const char *fk_only;
    int         save_nestlevel;
    char        workmembuf[32];
    int         spi_result;
    SPIPlanPtr  qplan;
    int         i;
 
    riinfo = ri_FetchConstraintInfo(trigger, fk_rel, false);
 
    /*
     * We don't check permissions before displaying the error message, on the
     * assumption that the user detaching the partition must have enough
     * privileges to examine the table contents anyhow.
     */
 
    /*----------
     * The query string built is:
     *  SELECT fk.keycols FROM [ONLY] relname fk
     *    JOIN pkrelname pk
     *    ON (pk.pkkeycol1=fk.keycol1 [AND ...])
     *    WHERE (<partition constraint>) AND
     * For MATCH SIMPLE:
     *   (fk.keycol1 IS NOT NULL [AND ...])
     * For MATCH FULL:
     *   (fk.keycol1 IS NOT NULL [OR ...])
     *
     * We attach COLLATE clauses to the operators when comparing columns
     * that have different collations.
     *----------
     */
    initStringInfo(&querybuf);
    appendStringInfoString(&querybuf, "SELECT ");
    sep = "";
    for (i = 0; i < riinfo->nkeys; i++)
    {
        quoteOneName(fkattname,
                     RIAttName(fk_rel, riinfo->fk_attnums[i]));
        appendStringInfo(&querybuf, "%sfk.%s", sep, fkattname);
        sep = ", ";
    }
 
    quoteRelationName(pkrelname, pk_rel);
    quoteRelationName(fkrelname, fk_rel);
    fk_only = fk_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ?
        "" : "ONLY ";
    appendStringInfo(&querybuf,
                     " FROM %s%s fk JOIN %s pk ON",
                     fk_only, fkrelname, pkrelname);
    strcpy(pkattname, "pk.");
    strcpy(fkattname, "fk.");
    sep = "(";
    for (i = 0; i < riinfo->nkeys; i++)
    {
        Oid         pk_type = RIAttType(pk_rel, riinfo->pk_attnums[i]);
        Oid         fk_type = RIAttType(fk_rel, riinfo->fk_attnums[i]);
        Oid         pk_coll = RIAttCollation(pk_rel, riinfo->pk_attnums[i]);
        Oid         fk_coll = RIAttCollation(fk_rel, riinfo->fk_attnums[i]);
 
        quoteOneName(pkattname + 3,
                     RIAttName(pk_rel, riinfo->pk_attnums[i]));
        quoteOneName(fkattname + 3,
                     RIAttName(fk_rel, riinfo->fk_attnums[i]));
        ri_GenerateQual(&querybuf, sep,
                        pkattname, pk_type,
                        riinfo->pf_eq_oprs[i],
                        fkattname, fk_type);
        if (pk_coll != fk_coll)
            ri_GenerateQualCollation(&querybuf, pk_coll);
        sep = "AND";
    }
 
    /*
     * Start the WHERE clause with the partition constraint (except if this is
     * the default partition and there's no other partition, because the
     * partition constraint is the empty string in that case.)
     */
    constraintDef = pg_get_partconstrdef_string(RelationGetRelid(pk_rel), "pk");
    if (constraintDef && constraintDef[0] != '\0')
        appendStringInfo(&querybuf, ") WHERE %s AND (",
                         constraintDef);
    else
        appendStringInfoString(&querybuf, ") WHERE (");
 
    sep = "";
    for (i = 0; i < riinfo->nkeys; i++)
    {
        quoteOneName(fkattname, RIAttName(fk_rel, riinfo->fk_attnums[i]));
        appendStringInfo(&querybuf,
                         "%sfk.%s IS NOT NULL",
                         sep, fkattname);
        switch (riinfo->confmatchtype)
        {
            case FKCONSTR_MATCH_SIMPLE:
                sep = " AND ";
                break;
            case FKCONSTR_MATCH_FULL:
                sep = " OR ";
                break;
        }
    }
    appendStringInfoChar(&querybuf, ')');
 
    /*
     * Temporarily increase work_mem so that the check query can be executed
     * more efficiently.  It seems okay to do this because the query is simple
     * enough to not use a multiple of work_mem, and one typically would not
     * have many large foreign-key validations happening concurrently.  So
     * this seems to meet the criteria for being considered a "maintenance"
     * operation, and accordingly we use maintenance_work_mem.  However, we
     * must also set hash_mem_multiplier to 1, since it is surely not okay to
     * let that get applied to the maintenance_work_mem value.
     *
     * We use the equivalent of a function SET option to allow the setting to
     * persist for exactly the duration of the check query.  guc.c also takes
     * care of undoing the setting on error.
     */
    save_nestlevel = NewGUCNestLevel();
 
    snprintf(workmembuf, sizeof(workmembuf), "%d", maintenance_work_mem);
    (void) set_config_option("work_mem", workmembuf,
                             PGC_USERSET, PGC_S_SESSION,
                             GUC_ACTION_SAVE, true, 0, false);
    (void) set_config_option("hash_mem_multiplier", "1",
                             PGC_USERSET, PGC_S_SESSION,
                             GUC_ACTION_SAVE, true, 0, false);
 
    SPI_connect();
 
    /*
     * Generate the plan.  We don't need to cache it, and there are no
     * arguments to the plan.
     */
    qplan = SPI_prepare(querybuf.data, 0, NULL);
 
    if (qplan == NULL)
        elog(ERROR, "SPI_prepare returned %s for %s",
             SPI_result_code_string(SPI_result), querybuf.data);
 
    /*
     * Run the plan.  For safety we force a current snapshot to be used. (In
     * transaction-snapshot mode, this arguably violates transaction isolation
     * rules, but we really haven't got much choice.) We don't need to
     * register the snapshot, because SPI_execute_snapshot will see to it. We
     * need at most one tuple returned, so pass limit = 1.
     */
    spi_result = SPI_execute_snapshot(qplan,
                                      NULL, NULL,
                                      GetLatestSnapshot(),
                                      InvalidSnapshot,
                                      true, false, 1);
 
    /* Check result */
    if (spi_result != SPI_OK_SELECT)
        elog(ERROR, "SPI_execute_snapshot returned %s", SPI_result_code_string(spi_result));
 
    /* Did we find a tuple that would violate the constraint? */
    if (SPI_processed > 0)
    {
        TupleTableSlot *slot;
        HeapTuple   tuple = SPI_tuptable->vals[0];
        TupleDesc   tupdesc = SPI_tuptable->tupdesc;
        RI_ConstraintInfo fake_riinfo;
 
        slot = MakeSingleTupleTableSlot(tupdesc, &TTSOpsVirtual);
 
        heap_deform_tuple(tuple, tupdesc,
                          slot->tts_values, slot->tts_isnull);
        ExecStoreVirtualTuple(slot);
 
        /*
         * The columns to look at in the result tuple are 1..N, not whatever
         * they are in the fk_rel.  Hack up riinfo so that ri_ReportViolation
         * will behave properly.
         *
         * In addition to this, we have to pass the correct tupdesc to
         * ri_ReportViolation, overriding its normal habit of using the pk_rel
         * or fk_rel's tupdesc.
         */
        memcpy(&fake_riinfo, riinfo, sizeof(RI_ConstraintInfo));
        for (i = 0; i < fake_riinfo.nkeys; i++)
            fake_riinfo.pk_attnums[i] = i + 1;
 
        ri_ReportViolation(&fake_riinfo, pk_rel, fk_rel,
                           slot, tupdesc, 0, false, true);
    }
 
    if (SPI_finish() != SPI_OK_FINISH)
        elog(ERROR, "SPI_finish failed");
 
    /*
     * Restore work_mem and hash_mem_multiplier.
     */
    AtEOXact_GUC(true, save_nestlevel);
}

References appendStringInfo(), appendStringInfoChar(), appendStringInfoString(), AtEOXact_GUC(), elog, ERROR, ExecStoreVirtualTuple(), fb(), FKCONSTR_MATCH_FULL, FKCONSTR_MATCH_SIMPLE, GetLatestSnapshot(), GUC_ACTION_SAVE, heap_deform_tuple(), i, initStringInfo(), InvalidSnapshot, maintenance_work_mem, MakeSingleTupleTableSlot(), MAX_QUOTED_NAME_LEN, MAX_QUOTED_REL_NAME_LEN, memcpy(), NewGUCNestLevel(), pg_get_partconstrdef_string(), PGC_S_SESSION, PGC_USERSET, quoteOneName(), quoteRelationName(), RelationGetRelid, ri_FetchConstraintInfo(), ri_GenerateQual(), ri_GenerateQualCollation(), ri_ReportViolation(), RIAttCollation, RIAttName, RIAttType, set_config_option(), snprintf, SPI_connect(), SPI_execute_snapshot(), SPI_finish(), SPI_OK_FINISH, SPI_OK_SELECT, SPI_prepare(), SPI_processed, SPI_result, SPI_result_code_string(), SPI_tuptable, TupleTableSlot::tts_isnull, TupleTableSlot::tts_values, TTSOpsVirtual, SPITupleTable::tupdesc, and SPITupleTable::vals.

Referenced by ATDetachCheckNoForeignKeyRefs().

ri_PerformCheck()

static bool ri_PerformCheck ( const RI_ConstraintInfo *  riinfo, RI_QueryKey *  qkey, SPIPlanPtr  qplan, Relation  fk_rel, Relation  pk_rel, TupleTableSlot *  oldslot, TupleTableSlot *  newslot, bool  is_restrict, bool  detectNewRows, int  expect_OK  )

static

Definition at line 2627 of file ri_triggers.c.

{
    Relation    query_rel,
                source_rel;
    bool        source_is_pk;
    Snapshot    test_snapshot;
    Snapshot    crosscheck_snapshot;
    int         limit;
    int         spi_result;
    Oid         save_userid;
    int         save_sec_context;
    Datum       vals[RI_MAX_NUMKEYS * 2];
    char        nulls[RI_MAX_NUMKEYS * 2];
 
    /*
     * Use the query type code to determine whether the query is run against
     * the PK or FK table; we'll do the check as that table's owner
     */
    if (qkey->constr_queryno <= RI_PLAN_LAST_ON_PK)
        query_rel = pk_rel;
    else
        query_rel = fk_rel;
 
    /*
     * The values for the query are taken from the table on which the trigger
     * is called - it is normally the other one with respect to query_rel. An
     * exception is ri_Check_Pk_Match(), which uses the PK table for both (and
     * sets queryno to RI_PLAN_CHECK_LOOKUPPK_FROM_PK).  We might eventually
     * need some less klugy way to determine this.
     */
    if (qkey->constr_queryno == RI_PLAN_CHECK_LOOKUPPK)
    {
        source_rel = fk_rel;
        source_is_pk = false;
    }
    else
    {
        source_rel = pk_rel;
        source_is_pk = true;
    }
 
    /* Extract the parameters to be passed into the query */
    if (newslot)
    {
        ri_ExtractValues(source_rel, newslot, riinfo, source_is_pk,
                         vals, nulls);
        if (oldslot)
            ri_ExtractValues(source_rel, oldslot, riinfo, source_is_pk,
                             vals + riinfo->nkeys, nulls + riinfo->nkeys);
    }
    else
    {
        ri_ExtractValues(source_rel, oldslot, riinfo, source_is_pk,
                         vals, nulls);
    }
 
    /*
     * In READ COMMITTED mode, we just need to use an up-to-date regular
     * snapshot, and we will see all rows that could be interesting. But in
     * transaction-snapshot mode, we can't change the transaction snapshot. If
     * the caller passes detectNewRows == false then it's okay to do the query
     * with the transaction snapshot; otherwise we use a current snapshot, and
     * tell the executor to error out if it finds any rows under the current
     * snapshot that wouldn't be visible per the transaction snapshot.  Note
     * that SPI_execute_snapshot will register the snapshots, so we don't need
     * to bother here.
     */
    if (IsolationUsesXactSnapshot() && detectNewRows)
    {
        CommandCounterIncrement();  /* be sure all my own work is visible */
        test_snapshot = GetLatestSnapshot();
        crosscheck_snapshot = GetTransactionSnapshot();
    }
    else
    {
        /* the default SPI behavior is okay */
        test_snapshot = InvalidSnapshot;
        crosscheck_snapshot = InvalidSnapshot;
    }
 
    /*
     * If this is a select query (e.g., for a 'no action' or 'restrict'
     * trigger), we only need to see if there is a single row in the table,
     * matching the key.  Otherwise, limit = 0 - because we want the query to
     * affect ALL the matching rows.
     */
    limit = (expect_OK == SPI_OK_SELECT) ? 1 : 0;
 
    /* Switch to proper UID to perform check as */
    GetUserIdAndSecContext(&save_userid, &save_sec_context);
    SetUserIdAndSecContext(RelationGetForm(query_rel)->relowner,
                           save_sec_context | SECURITY_LOCAL_USERID_CHANGE |
                           SECURITY_NOFORCE_RLS);
 
    /*
     * Finally we can run the query.
     *
     * Set fire_triggers to false to ensure that AFTER triggers are queued in
     * the outer query's after-trigger context and fire after all RI updates
     * on the same row are complete, rather than immediately.
     */
    spi_result = SPI_execute_snapshot(qplan,
                                      vals, nulls,
                                      test_snapshot, crosscheck_snapshot,
                                      false, false, limit);
 
    /* Restore UID and security context */
    SetUserIdAndSecContext(save_userid, save_sec_context);
 
    /* Check result */
    if (spi_result < 0)
        elog(ERROR, "SPI_execute_snapshot returned %s", SPI_result_code_string(spi_result));
 
    if (expect_OK >= 0 && spi_result != expect_OK)
        ereport(ERROR,
                (errcode(ERRCODE_INTERNAL_ERROR),
                 errmsg("referential integrity query on \"%s\" from constraint \"%s\" on \"%s\" gave unexpected result",
                        RelationGetRelationName(pk_rel),
                        NameStr(riinfo->conname),
                        RelationGetRelationName(fk_rel)),
                 errhint("This is most likely due to a rule having rewritten the query.")));
 
    /* XXX wouldn't it be clearer to do this part at the caller? */
    if (qkey->constr_queryno != RI_PLAN_CHECK_LOOKUPPK_FROM_PK &&
        expect_OK == SPI_OK_SELECT &&
        (SPI_processed == 0) == (qkey->constr_queryno == RI_PLAN_CHECK_LOOKUPPK))
        ri_ReportViolation(riinfo,
                           pk_rel, fk_rel,
                           newslot ? newslot : oldslot,
                           NULL,
                           qkey->constr_queryno, is_restrict, false);
 
    return SPI_processed != 0;
}

References CommandCounterIncrement(), elog, ereport, errcode(), errhint(), errmsg, ERROR, fb(), GetLatestSnapshot(), GetTransactionSnapshot(), GetUserIdAndSecContext(), InvalidSnapshot, IsolationUsesXactSnapshot, NameStr, RelationGetForm, RelationGetRelationName, ri_ExtractValues(), RI_MAX_NUMKEYS, RI_PLAN_CHECK_LOOKUPPK, RI_PLAN_CHECK_LOOKUPPK_FROM_PK, RI_PLAN_LAST_ON_PK, ri_ReportViolation(), SECURITY_LOCAL_USERID_CHANGE, SECURITY_NOFORCE_RLS, SetUserIdAndSecContext(), SPI_execute_snapshot(), SPI_OK_SELECT, SPI_processed, and SPI_result_code_string().

Referenced by ri_Check_Pk_Match(), RI_FKey_cascade_del(), RI_FKey_cascade_upd(), RI_FKey_check(), ri_restrict(), and ri_set().

ri_PlanCheck()

static SPIPlanPtr ri_PlanCheck ( const char *  querystr, int  nargs, Oid *  argtypes, RI_QueryKey *  qkey, Relation  fk_rel, Relation  pk_rel  )

static

Definition at line 2584 of file ri_triggers.c.

{
    SPIPlanPtr  qplan;
    Relation    query_rel;
    Oid         save_userid;
    int         save_sec_context;
 
    /*
     * Use the query type code to determine whether the query is run against
     * the PK or FK table; we'll do the check as that table's owner
     */
    if (qkey->constr_queryno <= RI_PLAN_LAST_ON_PK)
        query_rel = pk_rel;
    else
        query_rel = fk_rel;
 
    /* Switch to proper UID to perform check as */
    GetUserIdAndSecContext(&save_userid, &save_sec_context);
    SetUserIdAndSecContext(RelationGetForm(query_rel)->relowner,
                           save_sec_context | SECURITY_LOCAL_USERID_CHANGE |
                           SECURITY_NOFORCE_RLS);
 
    /* Create the plan */
    qplan = SPI_prepare(querystr, nargs, argtypes);
 
    if (qplan == NULL)
        elog(ERROR, "SPI_prepare returned %s for %s", SPI_result_code_string(SPI_result), querystr);
 
    /* Restore UID and security context */
    SetUserIdAndSecContext(save_userid, save_sec_context);
 
    /* Save the plan */
    SPI_keepplan(qplan);
    ri_HashPreparedPlan(qkey, qplan);
 
    return qplan;
}

References elog, ERROR, fb(), GetUserIdAndSecContext(), RelationGetForm, ri_HashPreparedPlan(), RI_PLAN_LAST_ON_PK, SECURITY_LOCAL_USERID_CHANGE, SECURITY_NOFORCE_RLS, SetUserIdAndSecContext(), SPI_keepplan(), SPI_prepare(), SPI_result, and SPI_result_code_string().

Referenced by ri_Check_Pk_Match(), RI_FKey_cascade_del(), RI_FKey_cascade_upd(), RI_FKey_check(), ri_restrict(), and ri_set().

ri_populate_fastpath_metadata()

static void ri_populate_fastpath_metadata ( RI_ConstraintInfo *  riinfo, Relation  fk_rel, Relation  idx_rel  )

static

Definition at line 3439 of file ri_triggers.c.

{
    FastPathMeta *fpmeta;
    MemoryContext oldcxt = MemoryContextSwitchTo(TopMemoryContext);
 
    Assert(riinfo != NULL && riinfo->valid);
 
    fpmeta = palloc_object(FastPathMeta);
    for (int i = 0; i < riinfo->nkeys; i++)
    {
        Oid         eq_opr = riinfo->pf_eq_oprs[i];
        Oid         typeid = RIAttType(fk_rel, riinfo->fk_attnums[i]);
        Oid         lefttype;
        RI_CompareHashEntry *entry = ri_HashCompareOp(eq_opr, typeid);
 
        fmgr_info_copy(&fpmeta->cast_func_finfo[i], &entry->cast_func_finfo,
                       CurrentMemoryContext);
        fmgr_info_copy(&fpmeta->eq_opr_finfo[i], &entry->eq_opr_finfo,
                       CurrentMemoryContext);
        fpmeta->regops[i] = get_opcode(eq_opr);
 
        get_op_opfamily_properties(eq_opr,
                                   idx_rel->rd_opfamily[i],
                                   false,
                                   &fpmeta->strats[i],
                                   &lefttype,
                                   &fpmeta->subtypes[i]);
    }
 
    riinfo->fpmeta = fpmeta;
    MemoryContextSwitchTo(oldcxt);
}

References Assert, FastPathMeta::cast_func_finfo, RI_CompareHashEntry::cast_func_finfo, CurrentMemoryContext, FastPathMeta::eq_opr_finfo, RI_CompareHashEntry::eq_opr_finfo, fb(), fmgr_info_copy(), get_op_opfamily_properties(), get_opcode(), i, MemoryContextSwitchTo(), palloc_object, RelationData::rd_opfamily, FastPathMeta::regops, ri_HashCompareOp(), RIAttType, FastPathMeta::strats, FastPathMeta::subtypes, and TopMemoryContext.

Referenced by ri_FastPathBatchFlush(), and ri_FastPathCheck().

ri_ReportViolation()

static void ri_ReportViolation ( const RI_ConstraintInfo *  riinfo, Relation  pk_rel, Relation  fk_rel, TupleTableSlot *  violatorslot, TupleDesc  tupdesc, int  queryno, bool  is_restrict, bool  partgone  )

static

Definition at line 3506 of file ri_triggers.c.

{
    StringInfoData key_names;
    StringInfoData key_values;
    bool        onfk;
    const int16 *attnums;
    Oid         rel_oid;
    AclResult   aclresult;
    bool        has_perm = true;
 
    /*
     * Determine which relation to complain about.  If tupdesc wasn't passed
     * by caller, assume the violator tuple came from there.
     */
    onfk = (queryno == RI_PLAN_CHECK_LOOKUPPK);
    if (onfk)
    {
        attnums = riinfo->fk_attnums;
        rel_oid = fk_rel->rd_id;
        if (tupdesc == NULL)
            tupdesc = fk_rel->rd_att;
    }
    else
    {
        attnums = riinfo->pk_attnums;
        rel_oid = pk_rel->rd_id;
        if (tupdesc == NULL)
            tupdesc = pk_rel->rd_att;
    }
 
    /*
     * Check permissions- if the user does not have access to view the data in
     * any of the key columns then we don't include the errdetail() below.
     *
     * Check if RLS is enabled on the relation first.  If so, we don't return
     * any specifics to avoid leaking data.
     *
     * Check table-level permissions next and, failing that, column-level
     * privileges.
     *
     * When a partition at the referenced side is being detached/dropped, we
     * needn't check, since the user must be the table owner anyway.
     */
    if (partgone)
        has_perm = true;
    else if (check_enable_rls(rel_oid, InvalidOid, true) != RLS_ENABLED)
    {
        aclresult = pg_class_aclcheck(rel_oid, GetUserId(), ACL_SELECT);
        if (aclresult != ACLCHECK_OK)
        {
            /* Try for column-level permissions */
            for (int idx = 0; idx < riinfo->nkeys; idx++)
            {
                aclresult = pg_attribute_aclcheck(rel_oid, attnums[idx],
                                                  GetUserId(),
                                                  ACL_SELECT);
 
                /* No access to the key */
                if (aclresult != ACLCHECK_OK)
                {
                    has_perm = false;
                    break;
                }
            }
        }
    }
    else
        has_perm = false;
 
    if (has_perm)
    {
        /* Get printable versions of the keys involved */
        initStringInfo(&key_names);
        initStringInfo(&key_values);
        for (int idx = 0; idx < riinfo->nkeys; idx++)
        {
            int         fnum = attnums[idx];
            Form_pg_attribute att = TupleDescAttr(tupdesc, fnum - 1);
            char       *name,
                       *val;
            Datum       datum;
            bool        isnull;
 
            name = NameStr(att->attname);
 
            datum = slot_getattr(violatorslot, fnum, &isnull);
            if (!isnull)
            {
                Oid         foutoid;
                bool        typisvarlena;
 
                getTypeOutputInfo(att->atttypid, &foutoid, &typisvarlena);
                val = OidOutputFunctionCall(foutoid, datum);
            }
            else
                val = "null";
 
            if (idx > 0)
            {
                appendStringInfoString(&key_names, ", ");
                appendStringInfoString(&key_values, ", ");
            }
            appendStringInfoString(&key_names, name);
            appendStringInfoString(&key_values, val);
        }
    }
 
    if (partgone)
        ereport(ERROR,
                (errcode(ERRCODE_FOREIGN_KEY_VIOLATION),
                 errmsg("removing partition \"%s\" violates foreign key constraint \"%s\"",
                        RelationGetRelationName(pk_rel),
                        NameStr(riinfo->conname)),
                 errdetail("Key (%s)=(%s) is still referenced from table \"%s\".",
                           key_names.data, key_values.data,
                           RelationGetRelationName(fk_rel)),
                 errtableconstraint(fk_rel, NameStr(riinfo->conname))));
    else if (onfk)
        ereport(ERROR,
                (errcode(ERRCODE_FOREIGN_KEY_VIOLATION),
                 errmsg("insert or update on table \"%s\" violates foreign key constraint \"%s\"",
                        RelationGetRelationName(fk_rel),
                        NameStr(riinfo->conname)),
                 has_perm ?
                 errdetail("Key (%s)=(%s) is not present in table \"%s\".",
                           key_names.data, key_values.data,
                           RelationGetRelationName(pk_rel)) :
                 errdetail("Key is not present in table \"%s\".",
                           RelationGetRelationName(pk_rel)),
                 errtableconstraint(fk_rel, NameStr(riinfo->conname))));
    else if (is_restrict)
        ereport(ERROR,
                (errcode(ERRCODE_RESTRICT_VIOLATION),
                 errmsg("update or delete on table \"%s\" violates RESTRICT setting of foreign key constraint \"%s\" on table \"%s\"",
                        RelationGetRelationName(pk_rel),
                        NameStr(riinfo->conname),
                        RelationGetRelationName(fk_rel)),
                 has_perm ?
                 errdetail("Key (%s)=(%s) is referenced from table \"%s\".",
                           key_names.data, key_values.data,
                           RelationGetRelationName(fk_rel)) :
                 errdetail("Key is referenced from table \"%s\".",
                           RelationGetRelationName(fk_rel)),
                 errtableconstraint(fk_rel, NameStr(riinfo->conname))));
    else
        ereport(ERROR,
                (errcode(ERRCODE_FOREIGN_KEY_VIOLATION),
                 errmsg("update or delete on table \"%s\" violates foreign key constraint \"%s\" on table \"%s\"",
                        RelationGetRelationName(pk_rel),
                        NameStr(riinfo->conname),
                        RelationGetRelationName(fk_rel)),
                 has_perm ?
                 errdetail("Key (%s)=(%s) is still referenced from table \"%s\".",
                           key_names.data, key_values.data,
                           RelationGetRelationName(fk_rel)) :
                 errdetail("Key is still referenced from table \"%s\".",
                           RelationGetRelationName(fk_rel)),
                 errtableconstraint(fk_rel, NameStr(riinfo->conname))));
}

References ACL_SELECT, ACLCHECK_OK, appendStringInfoString(), check_enable_rls(), ereport, errcode(), errdetail(), errmsg, ERROR, errtableconstraint(), fb(), getTypeOutputInfo(), GetUserId(), idx(), initStringInfo(), InvalidOid, name, NameStr, OidOutputFunctionCall(), pg_attribute_aclcheck(), pg_class_aclcheck(), RelationData::rd_att, RelationData::rd_id, RelationGetRelationName, RI_PLAN_CHECK_LOOKUPPK, RLS_ENABLED, slot_getattr(), TupleDescAttr(), and val.

Referenced by ri_FastPathBatchFlush(), ri_FastPathCheck(), RI_Initial_Check(), RI_PartitionRemove_Check(), and ri_PerformCheck().

ri_restrict()

static Datum ri_restrict ( TriggerData *  trigdata, bool  is_no_action  )

static

Definition at line 842 of file ri_triggers.c.

{
    const RI_ConstraintInfo *riinfo;
    Relation    fk_rel;
    Relation    pk_rel;
    TupleTableSlot *oldslot;
    RI_QueryKey qkey;
    SPIPlanPtr  qplan;
 
    riinfo = ri_FetchConstraintInfo(trigdata->tg_trigger,
                                    trigdata->tg_relation, true);
 
    /*
     * Get the relation descriptors of the FK and PK tables and the old tuple.
     *
     * fk_rel is opened in RowShareLock mode since that's what our eventual
     * SELECT FOR KEY SHARE will get on it.
     */
    fk_rel = table_open(riinfo->fk_relid, RowShareLock);
    pk_rel = trigdata->tg_relation;
    oldslot = trigdata->tg_trigslot;
 
    /*
     * If another PK row now exists providing the old key values, we should
     * not do anything.  However, this check should only be made in the NO
     * ACTION case; in RESTRICT cases we don't wish to allow another row to be
     * substituted.
     *
     * If the foreign key has PERIOD, we incorporate looking for replacement
     * rows in the main SQL query below, so we needn't do it here.
     */
    if (is_no_action && !riinfo->hasperiod &&
        ri_Check_Pk_Match(pk_rel, fk_rel, oldslot, riinfo))
    {
        table_close(fk_rel, RowShareLock);
        return PointerGetDatum(NULL);
    }
 
    SPI_connect();
 
    /*
     * Fetch or prepare a saved plan for the restrict lookup (it's the same
     * query for delete and update cases)
     */
    ri_BuildQueryKey(&qkey, riinfo, is_no_action ? RI_PLAN_NO_ACTION : RI_PLAN_RESTRICT);
 
    if ((qplan = ri_FetchPreparedPlan(&qkey)) == NULL)
    {
        StringInfoData querybuf;
        char        pkrelname[MAX_QUOTED_REL_NAME_LEN];
        char        fkrelname[MAX_QUOTED_REL_NAME_LEN];
        char        attname[MAX_QUOTED_NAME_LEN];
        char        periodattname[MAX_QUOTED_NAME_LEN];
        char        paramname[16];
        const char *querysep;
        Oid         queryoids[RI_MAX_NUMKEYS];
        const char *fk_only;
 
        /* ----------
         * The query string built is
         *  SELECT 1 FROM [ONLY] <fktable> x WHERE $1 = fkatt1 [AND ...]
         *         FOR KEY SHARE OF x
         * The type id's for the $ parameters are those of the
         * corresponding PK attributes.
         * ----------
         */
        initStringInfo(&querybuf);
        fk_only = fk_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ?
            "" : "ONLY ";
        quoteRelationName(fkrelname, fk_rel);
        appendStringInfo(&querybuf, "SELECT 1 FROM %s%s x",
                         fk_only, fkrelname);
        querysep = "WHERE";
        for (int i = 0; i < riinfo->nkeys; i++)
        {
            Oid         pk_type = RIAttType(pk_rel, riinfo->pk_attnums[i]);
            Oid         fk_type = RIAttType(fk_rel, riinfo->fk_attnums[i]);
 
            quoteOneName(attname,
                         RIAttName(fk_rel, riinfo->fk_attnums[i]));
            sprintf(paramname, "$%d", i + 1);
            ri_GenerateQual(&querybuf, querysep,
                            paramname, pk_type,
                            riinfo->pf_eq_oprs[i],
                            attname, fk_type);
            querysep = "AND";
            queryoids[i] = pk_type;
        }
 
        /*----------
         * For temporal foreign keys, a reference could still be valid if the
         * referenced range didn't change too much.  Also if a referencing
         * range extends past the current PK row, we don't want to check that
         * part: some other PK row should fulfill it.  We only want to check
         * the part matching the PK record we've changed.  Therefore to find
         * invalid records we do this:
         *
         * SELECT 1 FROM [ONLY] <fktable> x WHERE $1 = x.fkatt1 [AND ...]
         * -- begin temporal
         * AND $n && x.fkperiod
         * AND NOT coalesce((x.fkperiod * $n) <@
         *  (SELECT range_agg(r)
         *   FROM (SELECT y.pkperiod r
         *         FROM [ONLY] <pktable> y
         *         WHERE $1 = y.pkatt1 [AND ...] AND $n && y.pkperiod
         *         FOR KEY SHARE OF y) y2), false)
         * -- end temporal
         * FOR KEY SHARE OF x
         *
         * We need the coalesce in case the first subquery returns no rows.
         * We need the second subquery because FOR KEY SHARE doesn't support
         * aggregate queries.
         */
        if (riinfo->hasperiod && is_no_action)
        {
            Oid         pk_period_type = RIAttType(pk_rel, riinfo->pk_attnums[riinfo->nkeys - 1]);
            Oid         fk_period_type = RIAttType(fk_rel, riinfo->fk_attnums[riinfo->nkeys - 1]);
            StringInfoData intersectbuf;
            StringInfoData replacementsbuf;
            char       *pk_only = pk_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ?
                "" : "ONLY ";
 
            quoteOneName(attname, RIAttName(fk_rel, riinfo->fk_attnums[riinfo->nkeys - 1]));
            sprintf(paramname, "$%d", riinfo->nkeys);
 
            appendStringInfoString(&querybuf, " AND NOT coalesce(");
 
            /* Intersect the fk with the old pk range */
            initStringInfo(&intersectbuf);
            appendStringInfoChar(&intersectbuf, '(');
            ri_GenerateQual(&intersectbuf, "",
                            attname, fk_period_type,
                            riinfo->period_intersect_oper,
                            paramname, pk_period_type);
            appendStringInfoChar(&intersectbuf, ')');
 
            /* Find the remaining history */
            initStringInfo(&replacementsbuf);
            appendStringInfoString(&replacementsbuf, "(SELECT pg_catalog.range_agg(r) FROM ");
 
            quoteOneName(periodattname, RIAttName(pk_rel, riinfo->pk_attnums[riinfo->nkeys - 1]));
            quoteRelationName(pkrelname, pk_rel);
            appendStringInfo(&replacementsbuf, "(SELECT y.%s r FROM %s%s y",
                             periodattname, pk_only, pkrelname);
 
            /* Restrict pk rows to what matches */
            querysep = "WHERE";
            for (int i = 0; i < riinfo->nkeys; i++)
            {
                Oid         pk_type = RIAttType(pk_rel, riinfo->pk_attnums[i]);
 
                quoteOneName(attname,
                             RIAttName(pk_rel, riinfo->pk_attnums[i]));
                sprintf(paramname, "$%d", i + 1);
                ri_GenerateQual(&replacementsbuf, querysep,
                                paramname, pk_type,
                                riinfo->pp_eq_oprs[i],
                                attname, pk_type);
                querysep = "AND";
                queryoids[i] = pk_type;
            }
            appendStringInfoString(&replacementsbuf, " FOR KEY SHARE OF y) y2)");
 
            ri_GenerateQual(&querybuf, "",
                            intersectbuf.data, fk_period_type,
                            riinfo->agged_period_contained_by_oper,
                            replacementsbuf.data, ANYMULTIRANGEOID);
            /* end of coalesce: */
            appendStringInfoString(&querybuf, ", false)");
        }
 
        appendStringInfoString(&querybuf, " FOR KEY SHARE OF x");
 
        /* Prepare and save the plan */
        qplan = ri_PlanCheck(querybuf.data, riinfo->nkeys, queryoids,
                             &qkey, fk_rel, pk_rel);
    }
 
    /*
     * We have a plan now. Run it to check for existing references.
     */
    ri_PerformCheck(riinfo, &qkey, qplan,
                    fk_rel, pk_rel,
                    oldslot, NULL,
                    !is_no_action,
                    true,       /* must detect new rows */
                    SPI_OK_SELECT);
 
    if (SPI_finish() != SPI_OK_FINISH)
        elog(ERROR, "SPI_finish failed");
 
    table_close(fk_rel, RowShareLock);
 
    return PointerGetDatum(NULL);
}

References appendStringInfo(), appendStringInfoChar(), appendStringInfoString(), attname, elog, ERROR, fb(), i, initStringInfo(), MAX_QUOTED_NAME_LEN, MAX_QUOTED_REL_NAME_LEN, PointerGetDatum(), quoteOneName(), quoteRelationName(), RelationData::rd_rel, ri_BuildQueryKey(), ri_Check_Pk_Match(), ri_FetchConstraintInfo(), ri_FetchPreparedPlan(), ri_GenerateQual(), RI_MAX_NUMKEYS, ri_PerformCheck(), RI_PLAN_NO_ACTION, RI_PLAN_RESTRICT, ri_PlanCheck(), RIAttName, RIAttType, RowShareLock, SPI_connect(), SPI_finish(), SPI_OK_FINISH, SPI_OK_SELECT, sprintf, table_close(), table_open(), TriggerData::tg_relation, TriggerData::tg_trigger, and TriggerData::tg_trigslot.

Referenced by RI_FKey_noaction_del(), RI_FKey_noaction_upd(), RI_FKey_restrict_del(), RI_FKey_restrict_upd(), and ri_set().

ri_set()

static Datum ri_set ( TriggerData *  trigdata, bool  is_set_null, int  tgkind  )

static

Definition at line 1325 of file ri_triggers.c.

{
    const RI_ConstraintInfo *riinfo;
    Relation    fk_rel;
    Relation    pk_rel;
    TupleTableSlot *oldslot;
    RI_QueryKey qkey;
    SPIPlanPtr  qplan;
    int32       queryno;
 
    riinfo = ri_FetchConstraintInfo(trigdata->tg_trigger,
                                    trigdata->tg_relation, true);
 
    /*
     * Get the relation descriptors of the FK and PK tables and the old tuple.
     *
     * fk_rel is opened in RowExclusiveLock mode since that's what our
     * eventual UPDATE will get on it.
     */
    fk_rel = table_open(riinfo->fk_relid, RowExclusiveLock);
    pk_rel = trigdata->tg_relation;
    oldslot = trigdata->tg_trigslot;
 
    SPI_connect();
 
    /*
     * Fetch or prepare a saved plan for the trigger.
     */
    switch (tgkind)
    {
        case RI_TRIGTYPE_UPDATE:
            queryno = is_set_null
                ? RI_PLAN_SETNULL_ONUPDATE
                : RI_PLAN_SETDEFAULT_ONUPDATE;
            break;
        case RI_TRIGTYPE_DELETE:
            queryno = is_set_null
                ? RI_PLAN_SETNULL_ONDELETE
                : RI_PLAN_SETDEFAULT_ONDELETE;
            break;
        default:
            elog(ERROR, "invalid tgkind passed to ri_set");
    }
 
    ri_BuildQueryKey(&qkey, riinfo, queryno);
 
    if ((qplan = ri_FetchPreparedPlan(&qkey)) == NULL)
    {
        StringInfoData querybuf;
        char        fkrelname[MAX_QUOTED_REL_NAME_LEN];
        char        attname[MAX_QUOTED_NAME_LEN];
        char        paramname[16];
        const char *querysep;
        const char *qualsep;
        Oid         queryoids[RI_MAX_NUMKEYS];
        const char *fk_only;
        int         num_cols_to_set;
        const int16 *set_cols;
 
        switch (tgkind)
        {
            case RI_TRIGTYPE_UPDATE:
                num_cols_to_set = riinfo->nkeys;
                set_cols = riinfo->fk_attnums;
                break;
            case RI_TRIGTYPE_DELETE:
 
                /*
                 * If confdelsetcols are present, then we only update the
                 * columns specified in that array, otherwise we update all
                 * the referencing columns.
                 */
                if (riinfo->ndelsetcols != 0)
                {
                    num_cols_to_set = riinfo->ndelsetcols;
                    set_cols = riinfo->confdelsetcols;
                }
                else
                {
                    num_cols_to_set = riinfo->nkeys;
                    set_cols = riinfo->fk_attnums;
                }
                break;
            default:
                elog(ERROR, "invalid tgkind passed to ri_set");
        }
 
        /* ----------
         * The query string built is
         *  UPDATE [ONLY] <fktable> SET fkatt1 = {NULL|DEFAULT} [, ...]
         *          WHERE $1 = fkatt1 [AND ...]
         * The type id's for the $ parameters are those of the
         * corresponding PK attributes.
         * ----------
         */
        initStringInfo(&querybuf);
        fk_only = fk_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ?
            "" : "ONLY ";
        quoteRelationName(fkrelname, fk_rel);
        appendStringInfo(&querybuf, "UPDATE %s%s SET",
                         fk_only, fkrelname);
 
        /*
         * Add assignment clauses
         */
        querysep = "";
        for (int i = 0; i < num_cols_to_set; i++)
        {
            quoteOneName(attname, RIAttName(fk_rel, set_cols[i]));
            appendStringInfo(&querybuf,
                             "%s %s = %s",
                             querysep, attname,
                             is_set_null ? "NULL" : "DEFAULT");
            querysep = ",";
        }
 
        /*
         * Add WHERE clause
         */
        qualsep = "WHERE";
        for (int i = 0; i < riinfo->nkeys; i++)
        {
            Oid         pk_type = RIAttType(pk_rel, riinfo->pk_attnums[i]);
            Oid         fk_type = RIAttType(fk_rel, riinfo->fk_attnums[i]);
 
            quoteOneName(attname,
                         RIAttName(fk_rel, riinfo->fk_attnums[i]));
 
            sprintf(paramname, "$%d", i + 1);
            ri_GenerateQual(&querybuf, qualsep,
                            paramname, pk_type,
                            riinfo->pf_eq_oprs[i],
                            attname, fk_type);
            qualsep = "AND";
            queryoids[i] = pk_type;
        }
 
        /* Prepare and save the plan */
        qplan = ri_PlanCheck(querybuf.data, riinfo->nkeys, queryoids,
                             &qkey, fk_rel, pk_rel);
    }
 
    /*
     * We have a plan now. Run it to update the existing references.
     */
    ri_PerformCheck(riinfo, &qkey, qplan,
                    fk_rel, pk_rel,
                    oldslot, NULL,
                    false,
                    true,       /* must detect new rows */
                    SPI_OK_UPDATE);
 
    if (SPI_finish() != SPI_OK_FINISH)
        elog(ERROR, "SPI_finish failed");
 
    table_close(fk_rel, RowExclusiveLock);
 
    if (is_set_null)
        return PointerGetDatum(NULL);
    else
    {
        /*
         * If we just deleted or updated the PK row whose key was equal to the
         * FK columns' default values, and a referencing row exists in the FK
         * table, we would have updated that row to the same values it already
         * had --- and RI_FKey_fk_upd_check_required would hence believe no
         * check is necessary.  So we need to do another lookup now and in
         * case a reference still exists, abort the operation.  That is
         * already implemented in the NO ACTION trigger, so just run it. (This
         * recheck is only needed in the SET DEFAULT case, since CASCADE would
         * remove such rows in case of a DELETE operation or would change the
         * FK key values in case of an UPDATE, while SET NULL is certain to
         * result in rows that satisfy the FK constraint.)
         */
        return ri_restrict(trigdata, true);
    }
}

References appendStringInfo(), attname, elog, ERROR, fb(), i, initStringInfo(), MAX_QUOTED_NAME_LEN, MAX_QUOTED_REL_NAME_LEN, PointerGetDatum(), quoteOneName(), quoteRelationName(), ri_BuildQueryKey(), ri_FetchConstraintInfo(), ri_FetchPreparedPlan(), ri_GenerateQual(), RI_MAX_NUMKEYS, ri_PerformCheck(), RI_PLAN_SETDEFAULT_ONDELETE, RI_PLAN_SETDEFAULT_ONUPDATE, RI_PLAN_SETNULL_ONDELETE, RI_PLAN_SETNULL_ONUPDATE, ri_PlanCheck(), ri_restrict(), RI_TRIGTYPE_DELETE, RI_TRIGTYPE_UPDATE, RIAttName, RIAttType, RowExclusiveLock, SPI_connect(), SPI_finish(), SPI_OK_FINISH, SPI_OK_UPDATE, sprintf, table_close(), table_open(), TriggerData::tg_relation, TriggerData::tg_trigger, and TriggerData::tg_trigslot.

Referenced by RI_FKey_setdefault_del(), RI_FKey_setdefault_upd(), RI_FKey_setnull_del(), and RI_FKey_setnull_upd().

Variable Documentation

ri_compare_cache

HTAB* ri_compare_cache = NULL

static

Definition at line 258 of file ri_triggers.c.

Referenced by ri_HashCompareOp(), and ri_InitHashTables().

ri_constraint_cache

HTAB* ri_constraint_cache = NULL

static

Definition at line 256 of file ri_triggers.c.

Referenced by InvalidateConstraintCacheCallBack(), ri_InitHashTables(), and ri_LoadConstraintInfo().

ri_constraint_cache_valid_list

dclist_head ri_constraint_cache_valid_list

static

Definition at line 259 of file ri_triggers.c.

Referenced by InvalidateConstraintCacheCallBack(), and ri_LoadConstraintInfo().

ri_fastpath_cache

HTAB* ri_fastpath_cache = NULL

static

Definition at line 261 of file ri_triggers.c.

Referenced by ri_FastPathEndBatch(), ri_FastPathGetEntry(), ri_FastPathSubXactCallback(), ri_FastPathTeardown(), and ri_FastPathXactCallback().

ri_fastpath_callback_registered

bool ri_fastpath_callback_registered = false

static

Definition at line 262 of file ri_triggers.c.

Referenced by ri_FastPathGetEntry(), ri_FastPathSubXactCallback(), ri_FastPathTeardown(), and ri_FastPathXactCallback().

ri_fastpath_xact_callback_registered

bool ri_fastpath_xact_callback_registered = false

static

Definition at line 4169 of file ri_triggers.c.

Referenced by ri_FastPathGetEntry().

ri_query_cache

HTAB* ri_query_cache = NULL

static

Definition at line 257 of file ri_triggers.c.

Referenced by ri_FetchPreparedPlan(), ri_HashPreparedPlan(), and ri_InitHashTables().