pg_constraint.h File Reference

#include "catalog/dependency.h"
#include "catalog/genbki.h"
#include "catalog/pg_constraint_d.h"
#include "nodes/pg_list.h"

Include dependency graph for pg_constraint.h:

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Typedefs
typedef FormData_pg_constraint *	Form_pg_constraint
typedef enum ConstraintCategory	ConstraintCategory

Enumerations
enum	ConstraintCategory { CONSTRAINT_RELATION, CONSTRAINT_DOMAIN, CONSTRAINT_ASSERTION }

Functions
	CATALOG (pg_constraint, 2606, ConstraintRelationId)
Oid	CreateConstraintEntry (const char *constraintName, Oid constraintNamespace, char constraintType, bool isDeferrable, bool isDeferred, bool isValidated, Oid parentConstrId, Oid relId, const int16 *constraintKey, int constraintNKeys, int constraintNTotalKeys, Oid domainId, Oid indexRelId, Oid foreignRelId, const int16 *foreignKey, const Oid *pfEqOp, const Oid *ppEqOp, const Oid *ffEqOp, int foreignNKeys, char foreignUpdateType, char foreignDeleteType, char foreignMatchType, const Oid *exclOp, Node *conExpr, const char *conBin, bool conIsLocal, int conInhCount, bool conNoInherit, bool is_internal)
void	RemoveConstraintById (Oid conId)
void	RenameConstraintById (Oid conId, const char *newname)
bool	ConstraintNameIsUsed (ConstraintCategory conCat, Oid objId, const char *conname)
bool	ConstraintNameExists (const char *conname, Oid namespaceid)
char *	ChooseConstraintName (const char *name1, const char *name2, const char *label, Oid namespaceid, List *others)
void	AlterConstraintNamespaces (Oid ownerId, Oid oldNspId, Oid newNspId, bool isType, ObjectAddresses *objsMoved)
void	ConstraintSetParentConstraint (Oid childConstrId, Oid parentConstrId, Oid childTableId)
Oid	get_relation_constraint_oid (Oid relid, const char *conname, bool missing_ok)
Bitmapset *	get_relation_constraint_attnos (Oid relid, const char *conname, bool missing_ok, Oid *constraintOid)
Oid	get_domain_constraint_oid (Oid typid, const char *conname, bool missing_ok)
Oid	get_relation_idx_constraint_oid (Oid relationId, Oid indexId)
Bitmapset *	get_primary_key_attnos (Oid relid, bool deferrableOk, Oid *constraintOid)
void	DeconstructFkConstraintRow (HeapTuple tuple, int *numfks, AttrNumber *conkey, AttrNumber *confkey, Oid *pf_eq_oprs, Oid *pp_eq_oprs, Oid *ff_eq_oprs)
bool	check_functional_grouping (Oid relid, Index varno, Index varlevelsup, List *grouping_columns, List **constraintDeps)

Variables
	FormData_pg_constraint

Typedef Documentation

ConstraintCategory

typedef enum ConstraintCategory ConstraintCategory

Form_pg_constraint

typedef FormData_pg_constraint* Form_pg_constraint

Definition at line 154 of file pg_constraint.h.

Enumeration Type Documentation

ConstraintCategory

enum ConstraintCategory

Enumerator
CONSTRAINT_RELATION
CONSTRAINT_DOMAIN
CONSTRAINT_ASSERTION

Definition at line 177 of file pg_constraint.h.

{
    CONSTRAINT_RELATION,
    CONSTRAINT_DOMAIN,
    CONSTRAINT_ASSERTION        /* for future expansion */
} ConstraintCategory;

Function Documentation

AlterConstraintNamespaces()

void AlterConstraintNamespaces	(	Oid	ownerId,
		Oid	oldNspId,
		Oid	newNspId,
		bool	isType,
		ObjectAddresses *	objsMoved
	)

Definition at line 700 of file pg_constraint.c.

References add_exact_object_address(), BTEqualStrategyNumber, CatalogTupleUpdate(), ConstraintRelidTypidNameIndexId, GETSTRUCT, heap_copytuple(), HeapTupleIsValid, InvalidOid, InvokeObjectPostAlterHook, sort-test::key, object_address_present(), ObjectAddressSet, ObjectAddress::objectId, ObjectIdGetDatum, RowExclusiveLock, ScanKeyInit(), systable_beginscan(), systable_endscan(), systable_getnext(), HeapTupleData::t_self, table_close(), and table_open().

Referenced by AlterTableNamespaceInternal(), and AlterTypeNamespaceInternal().

{
    Relation    conRel;
    ScanKeyData key[2];
    SysScanDesc scan;
    HeapTuple   tup;

    conRel = table_open(ConstraintRelationId, RowExclusiveLock);

    ScanKeyInit(&key[0],
                Anum_pg_constraint_conrelid,
                BTEqualStrategyNumber, F_OIDEQ,
                ObjectIdGetDatum(isType ? InvalidOid : ownerId));
    ScanKeyInit(&key[1],
                Anum_pg_constraint_contypid,
                BTEqualStrategyNumber, F_OIDEQ,
                ObjectIdGetDatum(isType ? ownerId : InvalidOid));

    scan = systable_beginscan(conRel, ConstraintRelidTypidNameIndexId, true,
                              NULL, 2, key);

    while (HeapTupleIsValid((tup = systable_getnext(scan))))
    {
        Form_pg_constraint conform = (Form_pg_constraint) GETSTRUCT(tup);
        ObjectAddress thisobj;

        ObjectAddressSet(thisobj, ConstraintRelationId, conform->oid);

        if (object_address_present(&thisobj, objsMoved))
            continue;

        /* Don't update if the object is already part of the namespace */
        if (conform->connamespace == oldNspId && oldNspId != newNspId)
        {
            tup = heap_copytuple(tup);
            conform = (Form_pg_constraint) GETSTRUCT(tup);

            conform->connamespace = newNspId;

            CatalogTupleUpdate(conRel, &tup->t_self, tup);

            /*
             * Note: currently, the constraint will not have its own
             * dependency on the namespace, so we don't need to do
             * changeDependencyFor().
             */
        }

        InvokeObjectPostAlterHook(ConstraintRelationId, thisobj.objectId, 0);

        add_exact_object_address(&thisobj, objsMoved);
    }

    systable_endscan(scan);

    table_close(conRel, RowExclusiveLock);
}

CATALOG()

CATALOG	(	pg_constraint	,
		2606	,
		ConstraintRelationId
	)

Definition at line 31 of file pg_constraint.h.

{
    Oid         oid;            /* oid */

    /*
     * conname + connamespace is deliberately not unique; we allow, for
     * example, the same name to be used for constraints of different
     * relations.  This is partly for backwards compatibility with past
     * Postgres practice, and partly because we don't want to have to obtain a
     * global lock to generate a globally unique name for a nameless
     * constraint.  We associate a namespace with constraint names only for
     * SQL-spec compatibility.
     *
     * However, we do require conname to be unique among the constraints of a
     * single relation or domain.  This is enforced by a unique index on
     * conrelid + contypid + conname.
     */
    NameData    conname;        /* name of this constraint */
    Oid         connamespace;   /* OID of namespace containing constraint */
    char        contype;        /* constraint type; see codes below */
    bool        condeferrable;  /* deferrable constraint? */
    bool        condeferred;    /* deferred by default? */
    bool        convalidated;   /* constraint has been validated? */

    /*
     * conrelid and conkey are only meaningful if the constraint applies to a
     * specific relation (this excludes domain constraints and assertions).
     * Otherwise conrelid is 0 and conkey is NULL.
     */
    Oid         conrelid;       /* relation this constraint constrains */

    /*
     * contypid links to the pg_type row for a domain if this is a domain
     * constraint.  Otherwise it's 0.
     *
     * For SQL-style global ASSERTIONs, both conrelid and contypid would be
     * zero. This is not presently supported, however.
     */
    Oid         contypid;       /* domain this constraint constrains */

    /*
     * conindid links to the index supporting the constraint, if any;
     * otherwise it's 0.  This is used for unique, primary-key, and exclusion
     * constraints, and less obviously for foreign-key constraints (where the
     * index is a unique index on the referenced relation's referenced
     * columns).  Notice that the index is on conrelid in the first case but
     * confrelid in the second.
     */
    Oid         conindid;       /* index supporting this constraint */

    /*
     * If this constraint is on a partition inherited from a partitioned
     * table, this is the OID of the corresponding constraint in the parent.
     */
    Oid         conparentid;

    /*
     * These fields, plus confkey, are only meaningful for a foreign-key
     * constraint.  Otherwise confrelid is 0 and the char fields are spaces.
     */
    Oid         confrelid;      /* relation referenced by foreign key */
    char        confupdtype;    /* foreign key's ON UPDATE action */
    char        confdeltype;    /* foreign key's ON DELETE action */
    char        confmatchtype;  /* foreign key's match type */

    /* Has a local definition (hence, do not drop when coninhcount is 0) */
    bool        conislocal;

    /* Number of times inherited from direct parent relation(s) */
    int32       coninhcount;

    /* Has a local definition and cannot be inherited */
    bool        connoinherit;

#ifdef CATALOG_VARLEN           /* variable-length fields start here */

    /*
     * Columns of conrelid that the constraint applies to, if known (this is
     * NULL for trigger constraints)
     */
    int16       conkey[1];

    /*
     * If a foreign key, the referenced columns of confrelid
     */
    int16       confkey[1];

    /*
     * If a foreign key, the OIDs of the PK = FK equality operators for each
     * column of the constraint
     */
    Oid         conpfeqop[1];

    /*
     * If a foreign key, the OIDs of the PK = PK equality operators for each
     * column of the constraint (i.e., equality for the referenced columns)
     */
    Oid         conppeqop[1];

    /*
     * If a foreign key, the OIDs of the FK = FK equality operators for each
     * column of the constraint (i.e., equality for the referencing columns)
     */
    Oid         conffeqop[1];

    /*
     * If an exclusion constraint, the OIDs of the exclusion operators for
     * each column of the constraint
     */
    Oid         conexclop[1];

    /*
     * If a check constraint, nodeToString representation of expression
     */
    pg_node_tree conbin;
#endif
} FormData_pg_constraint;

check_functional_grouping()

bool check_functional_grouping	(	Oid	relid,
		Index	varno,
		Index	varlevelsup,
		List *	grouping_columns,
		List **	constraintDeps
	)

Definition at line 1282 of file pg_constraint.c.

References bms_add_member(), bms_is_subset(), FirstLowInvalidHeapAttributeNumber, get_primary_key_attnos(), IsA, lappend_oid(), lfirst, Var::varattno, Var::varlevelsup, and Var::varno.

Referenced by check_ungrouped_columns_walker().

{
    Bitmapset  *pkattnos;
    Bitmapset  *groupbyattnos;
    Oid         constraintOid;
    ListCell   *gl;

    /* If the rel has no PK, then we can't prove functional dependency */
    pkattnos = get_primary_key_attnos(relid, false, &constraintOid);
    if (pkattnos == NULL)
        return false;

    /* Identify all the rel's columns that appear in grouping_columns */
    groupbyattnos = NULL;
    foreach(gl, grouping_columns)
    {
        Var        *gvar = (Var *) lfirst(gl);

        if (IsA(gvar, Var) &&
            gvar->varno == varno &&
            gvar->varlevelsup == varlevelsup)
            groupbyattnos = bms_add_member(groupbyattnos,
                                           gvar->varattno - FirstLowInvalidHeapAttributeNumber);
    }

    if (bms_is_subset(pkattnos, groupbyattnos))
    {
        /* The PK is a subset of grouping_columns, so we win */
        *constraintDeps = lappend_oid(*constraintDeps, constraintOid);
        return true;
    }

    return false;
}

ChooseConstraintName()

char* ChooseConstraintName	(	const char *	name1,
		const char *	name2,
		const char *	label,
		Oid	namespaceid,
		List *	others
	)

Definition at line 487 of file pg_constraint.c.

References AccessShareLock, BTEqualStrategyNumber, ConstraintNameNspIndexId, CStringGetDatum, HeapTupleIsValid, lfirst, makeObjectName(), NAMEDATALEN, ObjectIdGetDatum, pfree(), ScanKeyInit(), snprintf, strlcpy(), systable_beginscan(), systable_endscan(), systable_getnext(), table_close(), and table_open().

Referenced by addFkRecurseReferenced(), addFkRecurseReferencing(), AddRelationNewConstraints(), ATExecAddConstraint(), CloneFkReferencing(), and domainAddConstraint().

{
    int         pass = 0;
    char       *conname = NULL;
    char        modlabel[NAMEDATALEN];
    Relation    conDesc;
    SysScanDesc conscan;
    ScanKeyData skey[2];
    bool        found;
    ListCell   *l;

    conDesc = table_open(ConstraintRelationId, AccessShareLock);

    /* try the unmodified label first */
    strlcpy(modlabel, label, sizeof(modlabel));

    for (;;)
    {
        conname = makeObjectName(name1, name2, modlabel);

        found = false;

        foreach(l, others)
        {
            if (strcmp((char *) lfirst(l), conname) == 0)
            {
                found = true;
                break;
            }
        }

        if (!found)
        {
            ScanKeyInit(&skey[0],
                        Anum_pg_constraint_conname,
                        BTEqualStrategyNumber, F_NAMEEQ,
                        CStringGetDatum(conname));

            ScanKeyInit(&skey[1],
                        Anum_pg_constraint_connamespace,
                        BTEqualStrategyNumber, F_OIDEQ,
                        ObjectIdGetDatum(namespaceid));

            conscan = systable_beginscan(conDesc, ConstraintNameNspIndexId, true,
                                         NULL, 2, skey);

            found = (HeapTupleIsValid(systable_getnext(conscan)));

            systable_endscan(conscan);
        }

        if (!found)
            break;

        /* found a conflict, so try a new name component */
        pfree(conname);
        snprintf(modlabel, sizeof(modlabel), "%s%d", label, ++pass);
    }

    table_close(conDesc, AccessShareLock);

    return conname;
}

ConstraintNameExists()

bool ConstraintNameExists	(	const char *	conname,
		Oid	namespaceid
	)

Definition at line 433 of file pg_constraint.c.

References AccessShareLock, BTEqualStrategyNumber, ConstraintNameNspIndexId, CStringGetDatum, HeapTupleIsValid, ObjectIdGetDatum, ScanKeyInit(), systable_beginscan(), systable_endscan(), systable_getnext(), table_close(), and table_open().

Referenced by ChooseRelationName().

{
    bool        found;
    Relation    conDesc;
    SysScanDesc conscan;
    ScanKeyData skey[2];

    conDesc = table_open(ConstraintRelationId, AccessShareLock);

    ScanKeyInit(&skey[0],
                Anum_pg_constraint_conname,
                BTEqualStrategyNumber, F_NAMEEQ,
                CStringGetDatum(conname));

    ScanKeyInit(&skey[1],
                Anum_pg_constraint_connamespace,
                BTEqualStrategyNumber, F_OIDEQ,
                ObjectIdGetDatum(namespaceid));

    conscan = systable_beginscan(conDesc, ConstraintNameNspIndexId, true,
                                 NULL, 2, skey);

    found = (HeapTupleIsValid(systable_getnext(conscan)));

    systable_endscan(conscan);
    table_close(conDesc, AccessShareLock);

    return found;
}

ConstraintNameIsUsed()

bool ConstraintNameIsUsed	(	ConstraintCategory	conCat,
		Oid	objId,
		const char *	conname
	)

Definition at line 388 of file pg_constraint.c.

References AccessShareLock, BTEqualStrategyNumber, CONSTRAINT_DOMAIN, CONSTRAINT_RELATION, ConstraintRelidTypidNameIndexId, CStringGetDatum, HeapTupleIsValid, InvalidOid, ObjectIdGetDatum, ScanKeyInit(), systable_beginscan(), systable_endscan(), systable_getnext(), table_close(), and table_open().

Referenced by addFkRecurseReferenced(), addFkRecurseReferencing(), ATExecAddConstraint(), CloneFkReferencing(), domainAddConstraint(), index_create(), and RenameConstraintById().

{
    bool        found;
    Relation    conDesc;
    SysScanDesc conscan;
    ScanKeyData skey[3];

    conDesc = table_open(ConstraintRelationId, AccessShareLock);

    ScanKeyInit(&skey[0],
                Anum_pg_constraint_conrelid,
                BTEqualStrategyNumber, F_OIDEQ,
                ObjectIdGetDatum((conCat == CONSTRAINT_RELATION)
                                 ? objId : InvalidOid));
    ScanKeyInit(&skey[1],
                Anum_pg_constraint_contypid,
                BTEqualStrategyNumber, F_OIDEQ,
                ObjectIdGetDatum((conCat == CONSTRAINT_DOMAIN)
                                 ? objId : InvalidOid));
    ScanKeyInit(&skey[2],
                Anum_pg_constraint_conname,
                BTEqualStrategyNumber, F_NAMEEQ,
                CStringGetDatum(conname));

    conscan = systable_beginscan(conDesc, ConstraintRelidTypidNameIndexId,
                                 true, NULL, 3, skey);

    /* There can be at most one matching row */
    found = (HeapTupleIsValid(systable_getnext(conscan)));

    systable_endscan(conscan);
    table_close(conDesc, AccessShareLock);

    return found;
}

ConstraintSetParentConstraint()

void ConstraintSetParentConstraint	(	Oid	childConstrId,
		Oid	parentConstrId,
		Oid	childTableId
	)

Definition at line 769 of file pg_constraint.c.

References Assert, CatalogTupleUpdate(), CONSTROID, deleteDependencyRecordsForClass(), DEPENDENCY_PARTITION_PRI, DEPENDENCY_PARTITION_SEC, elog, ERROR, GETSTRUCT, heap_copytuple(), HeapTupleIsValid, InvalidOid, ObjectAddressSet, ObjectIdGetDatum, OidIsValid, recordDependencyOn(), ReleaseSysCache(), RowExclusiveLock, SearchSysCache1(), HeapTupleData::t_self, table_close(), and table_open().

Referenced by ATExecAttachPartitionIdx(), ATExecDetachPartition(), AttachPartitionEnsureIndexes(), DefineIndex(), and tryAttachPartitionForeignKey().

{
    Relation    constrRel;
    Form_pg_constraint constrForm;
    HeapTuple   tuple,
                newtup;
    ObjectAddress depender;
    ObjectAddress referenced;

    constrRel = table_open(ConstraintRelationId, RowExclusiveLock);
    tuple = SearchSysCache1(CONSTROID, ObjectIdGetDatum(childConstrId));
    if (!HeapTupleIsValid(tuple))
        elog(ERROR, "cache lookup failed for constraint %u", childConstrId);
    newtup = heap_copytuple(tuple);
    constrForm = (Form_pg_constraint) GETSTRUCT(newtup);
    if (OidIsValid(parentConstrId))
    {
        /* don't allow setting parent for a constraint that already has one */
        Assert(constrForm->coninhcount == 0);
        if (constrForm->conparentid != InvalidOid)
            elog(ERROR, "constraint %u already has a parent constraint",
                 childConstrId);

        constrForm->conislocal = false;
        constrForm->coninhcount++;
        constrForm->conparentid = parentConstrId;

        CatalogTupleUpdate(constrRel, &tuple->t_self, newtup);

        ObjectAddressSet(depender, ConstraintRelationId, childConstrId);

        ObjectAddressSet(referenced, ConstraintRelationId, parentConstrId);
        recordDependencyOn(&depender, &referenced, DEPENDENCY_PARTITION_PRI);

        ObjectAddressSet(referenced, RelationRelationId, childTableId);
        recordDependencyOn(&depender, &referenced, DEPENDENCY_PARTITION_SEC);
    }
    else
    {
        constrForm->coninhcount--;
        constrForm->conislocal = true;
        constrForm->conparentid = InvalidOid;

        /* Make sure there's no further inheritance. */
        Assert(constrForm->coninhcount == 0);

        CatalogTupleUpdate(constrRel, &tuple->t_self, newtup);

        deleteDependencyRecordsForClass(ConstraintRelationId, childConstrId,
                                        ConstraintRelationId,
                                        DEPENDENCY_PARTITION_PRI);
        deleteDependencyRecordsForClass(ConstraintRelationId, childConstrId,
                                        RelationRelationId,
                                        DEPENDENCY_PARTITION_SEC);
    }

    ReleaseSysCache(tuple);
    table_close(constrRel, RowExclusiveLock);
}

CreateConstraintEntry()

Oid CreateConstraintEntry	(	const char *	constraintName,
		Oid	constraintNamespace,
		char	constraintType,
		bool	isDeferrable,
		bool	isDeferred,
		bool	isValidated,
		Oid	parentConstrId,
		Oid	relId,
		const int16 *	constraintKey,
		int	constraintNKeys,
		int	constraintNTotalKeys,
		Oid	domainId,
		Oid	indexRelId,
		Oid	foreignRelId,
		const int16 *	foreignKey,
		const Oid *	pfEqOp,
		const Oid *	ppEqOp,
		const Oid *	ffEqOp,
		int	foreignNKeys,
		char	foreignUpdateType,
		char	foreignDeleteType,
		char	foreignMatchType,
		const Oid *	exclOp,
		Node *	conExpr,
		const char *	conBin,
		bool	conIsLocal,
		int	conInhCount,
		bool	conNoInherit,
		bool	is_internal
	)

Definition at line 50 of file pg_constraint.c.

References add_exact_object_address(), Assert, BoolGetDatum, CatalogTupleInsert(), CharGetDatum, ObjectAddress::classId, ConstraintOidIndexId, construct_array(), CStringGetTextDatum, DEPENDENCY_AUTO, DEPENDENCY_NORMAL, free_object_addresses(), GetNewOidWithIndex(), heap_form_tuple(), i, Int16GetDatum, Int32GetDatum, InvokeObjectPostCreateHookArg, NameGetDatum, namestrcpy(), new_object_addresses(), ObjectAddressSet, ObjectAddressSubSet, ObjectAddress::objectId, ObjectIdGetDatum, ObjectAddress::objectSubId, OidIsValid, palloc(), PointerGetDatum, record_object_address_dependencies(), recordDependencyOnSingleRelExpr(), RelationGetDescr, RowExclusiveLock, table_close(), table_open(), and values.

Referenced by addFkRecurseReferenced(), addFkRecurseReferencing(), CloneFkReferencing(), CreateTrigger(), domainAddConstraint(), index_constraint_create(), and StoreRelCheck().

{
    Relation    conDesc;
    Oid         conOid;
    HeapTuple   tup;
    bool        nulls[Natts_pg_constraint];
    Datum       values[Natts_pg_constraint];
    ArrayType  *conkeyArray;
    ArrayType  *confkeyArray;
    ArrayType  *conpfeqopArray;
    ArrayType  *conppeqopArray;
    ArrayType  *conffeqopArray;
    ArrayType  *conexclopArray;
    NameData    cname;
    int         i;
    ObjectAddress conobject;
    ObjectAddresses *addrs_auto;
    ObjectAddresses *addrs_normal;

    conDesc = table_open(ConstraintRelationId, RowExclusiveLock);

    Assert(constraintName);
    namestrcpy(&cname, constraintName);

    /*
     * Convert C arrays into Postgres arrays.
     */
    if (constraintNKeys > 0)
    {
        Datum      *conkey;

        conkey = (Datum *) palloc(constraintNKeys * sizeof(Datum));
        for (i = 0; i < constraintNKeys; i++)
            conkey[i] = Int16GetDatum(constraintKey[i]);
        conkeyArray = construct_array(conkey, constraintNKeys,
                                      INT2OID, 2, true, TYPALIGN_SHORT);
    }
    else
        conkeyArray = NULL;

    if (foreignNKeys > 0)
    {
        Datum      *fkdatums;

        fkdatums = (Datum *) palloc(foreignNKeys * sizeof(Datum));
        for (i = 0; i < foreignNKeys; i++)
            fkdatums[i] = Int16GetDatum(foreignKey[i]);
        confkeyArray = construct_array(fkdatums, foreignNKeys,
                                       INT2OID, 2, true, TYPALIGN_SHORT);
        for (i = 0; i < foreignNKeys; i++)
            fkdatums[i] = ObjectIdGetDatum(pfEqOp[i]);
        conpfeqopArray = construct_array(fkdatums, foreignNKeys,
                                         OIDOID, sizeof(Oid), true, TYPALIGN_INT);
        for (i = 0; i < foreignNKeys; i++)
            fkdatums[i] = ObjectIdGetDatum(ppEqOp[i]);
        conppeqopArray = construct_array(fkdatums, foreignNKeys,
                                         OIDOID, sizeof(Oid), true, TYPALIGN_INT);
        for (i = 0; i < foreignNKeys; i++)
            fkdatums[i] = ObjectIdGetDatum(ffEqOp[i]);
        conffeqopArray = construct_array(fkdatums, foreignNKeys,
                                         OIDOID, sizeof(Oid), true, TYPALIGN_INT);
    }
    else
    {
        confkeyArray = NULL;
        conpfeqopArray = NULL;
        conppeqopArray = NULL;
        conffeqopArray = NULL;
    }

    if (exclOp != NULL)
    {
        Datum      *opdatums;

        opdatums = (Datum *) palloc(constraintNKeys * sizeof(Datum));
        for (i = 0; i < constraintNKeys; i++)
            opdatums[i] = ObjectIdGetDatum(exclOp[i]);
        conexclopArray = construct_array(opdatums, constraintNKeys,
                                         OIDOID, sizeof(Oid), true, TYPALIGN_INT);
    }
    else
        conexclopArray = NULL;

    /* initialize nulls and values */
    for (i = 0; i < Natts_pg_constraint; i++)
    {
        nulls[i] = false;
        values[i] = (Datum) NULL;
    }

    conOid = GetNewOidWithIndex(conDesc, ConstraintOidIndexId,
                                Anum_pg_constraint_oid);
    values[Anum_pg_constraint_oid - 1] = ObjectIdGetDatum(conOid);
    values[Anum_pg_constraint_conname - 1] = NameGetDatum(&cname);
    values[Anum_pg_constraint_connamespace - 1] = ObjectIdGetDatum(constraintNamespace);
    values[Anum_pg_constraint_contype - 1] = CharGetDatum(constraintType);
    values[Anum_pg_constraint_condeferrable - 1] = BoolGetDatum(isDeferrable);
    values[Anum_pg_constraint_condeferred - 1] = BoolGetDatum(isDeferred);
    values[Anum_pg_constraint_convalidated - 1] = BoolGetDatum(isValidated);
    values[Anum_pg_constraint_conrelid - 1] = ObjectIdGetDatum(relId);
    values[Anum_pg_constraint_contypid - 1] = ObjectIdGetDatum(domainId);
    values[Anum_pg_constraint_conindid - 1] = ObjectIdGetDatum(indexRelId);
    values[Anum_pg_constraint_conparentid - 1] = ObjectIdGetDatum(parentConstrId);
    values[Anum_pg_constraint_confrelid - 1] = ObjectIdGetDatum(foreignRelId);
    values[Anum_pg_constraint_confupdtype - 1] = CharGetDatum(foreignUpdateType);
    values[Anum_pg_constraint_confdeltype - 1] = CharGetDatum(foreignDeleteType);
    values[Anum_pg_constraint_confmatchtype - 1] = CharGetDatum(foreignMatchType);
    values[Anum_pg_constraint_conislocal - 1] = BoolGetDatum(conIsLocal);
    values[Anum_pg_constraint_coninhcount - 1] = Int32GetDatum(conInhCount);
    values[Anum_pg_constraint_connoinherit - 1] = BoolGetDatum(conNoInherit);

    if (conkeyArray)
        values[Anum_pg_constraint_conkey - 1] = PointerGetDatum(conkeyArray);
    else
        nulls[Anum_pg_constraint_conkey - 1] = true;

    if (confkeyArray)
        values[Anum_pg_constraint_confkey - 1] = PointerGetDatum(confkeyArray);
    else
        nulls[Anum_pg_constraint_confkey - 1] = true;

    if (conpfeqopArray)
        values[Anum_pg_constraint_conpfeqop - 1] = PointerGetDatum(conpfeqopArray);
    else
        nulls[Anum_pg_constraint_conpfeqop - 1] = true;

    if (conppeqopArray)
        values[Anum_pg_constraint_conppeqop - 1] = PointerGetDatum(conppeqopArray);
    else
        nulls[Anum_pg_constraint_conppeqop - 1] = true;

    if (conffeqopArray)
        values[Anum_pg_constraint_conffeqop - 1] = PointerGetDatum(conffeqopArray);
    else
        nulls[Anum_pg_constraint_conffeqop - 1] = true;

    if (conexclopArray)
        values[Anum_pg_constraint_conexclop - 1] = PointerGetDatum(conexclopArray);
    else
        nulls[Anum_pg_constraint_conexclop - 1] = true;

    if (conBin)
        values[Anum_pg_constraint_conbin - 1] = CStringGetTextDatum(conBin);
    else
        nulls[Anum_pg_constraint_conbin - 1] = true;

    tup = heap_form_tuple(RelationGetDescr(conDesc), values, nulls);

    CatalogTupleInsert(conDesc, tup);

    ObjectAddressSet(conobject, ConstraintRelationId, conOid);

    table_close(conDesc, RowExclusiveLock);

    /* Handle set of auto dependencies */
    addrs_auto = new_object_addresses();

    if (OidIsValid(relId))
    {
        /*
         * Register auto dependency from constraint to owning relation, or to
         * specific column(s) if any are mentioned.
         */
        ObjectAddress relobject;

        if (constraintNTotalKeys > 0)
        {
            for (i = 0; i < constraintNTotalKeys; i++)
            {
                ObjectAddressSubSet(relobject, RelationRelationId, relId,
                                    constraintKey[i]);
                add_exact_object_address(&relobject, addrs_auto);
            }
        }
        else
        {
            ObjectAddressSet(relobject, RelationRelationId, relId);
            add_exact_object_address(&relobject, addrs_auto);
        }
    }

    if (OidIsValid(domainId))
    {
        /*
         * Register auto dependency from constraint to owning domain
         */
        ObjectAddress domobject;

        ObjectAddressSet(domobject, TypeRelationId, domainId);
        add_exact_object_address(&domobject, addrs_auto);
    }

    record_object_address_dependencies(&conobject, addrs_auto,
                                       DEPENDENCY_AUTO);
    free_object_addresses(addrs_auto);

    /* Handle set of normal dependencies */
    addrs_normal = new_object_addresses();

    if (OidIsValid(foreignRelId))
    {
        /*
         * Register normal dependency from constraint to foreign relation, or
         * to specific column(s) if any are mentioned.
         */
        ObjectAddress relobject;

        if (foreignNKeys > 0)
        {
            for (i = 0; i < foreignNKeys; i++)
            {
                ObjectAddressSubSet(relobject, RelationRelationId,
                                    foreignRelId, foreignKey[i]);
                add_exact_object_address(&relobject, addrs_normal);
            }
        }
        else
        {
            ObjectAddressSet(relobject, RelationRelationId, foreignRelId);
            add_exact_object_address(&relobject, addrs_normal);
        }
    }

    if (OidIsValid(indexRelId) && constraintType == CONSTRAINT_FOREIGN)
    {
        /*
         * Register normal dependency on the unique index that supports a
         * foreign-key constraint.  (Note: for indexes associated with unique
         * or primary-key constraints, the dependency runs the other way, and
         * is not made here.)
         */
        ObjectAddress relobject;

        ObjectAddressSet(relobject, RelationRelationId, indexRelId);
        add_exact_object_address(&relobject, addrs_normal);
    }

    if (foreignNKeys > 0)
    {
        /*
         * Register normal dependencies on the equality operators that support
         * a foreign-key constraint.  If the PK and FK types are the same then
         * all three operators for a column are the same; otherwise they are
         * different.
         */
        ObjectAddress oprobject;

        oprobject.classId = OperatorRelationId;
        oprobject.objectSubId = 0;

        for (i = 0; i < foreignNKeys; i++)
        {
            oprobject.objectId = pfEqOp[i];
            add_exact_object_address(&oprobject, addrs_normal);
            if (ppEqOp[i] != pfEqOp[i])
            {
                oprobject.objectId = ppEqOp[i];
                add_exact_object_address(&oprobject, addrs_normal);
            }
            if (ffEqOp[i] != pfEqOp[i])
            {
                oprobject.objectId = ffEqOp[i];
                add_exact_object_address(&oprobject, addrs_normal);
            }
        }
    }

    record_object_address_dependencies(&conobject, addrs_normal,
                                       DEPENDENCY_NORMAL);
    free_object_addresses(addrs_normal);

    /*
     * We don't bother to register dependencies on the exclusion operators of
     * an exclusion constraint.  We assume they are members of the opclass
     * supporting the index, so there's an indirect dependency via that. (This
     * would be pretty dicey for cross-type operators, but exclusion operators
     * can never be cross-type.)
     */

    if (conExpr != NULL)
    {
        /*
         * Register dependencies from constraint to objects mentioned in CHECK
         * expression.
         */
        recordDependencyOnSingleRelExpr(&conobject, conExpr, relId,
                                        DEPENDENCY_NORMAL,
                                        DEPENDENCY_NORMAL, false);
    }

    /* Post creation hook for new constraint */
    InvokeObjectPostCreateHookArg(ConstraintRelationId, conOid, 0,
                                  is_internal);

    return conOid;
}

DeconstructFkConstraintRow()

void DeconstructFkConstraintRow	(	HeapTuple	tuple,
		int *	numfks,
		AttrNumber *	conkey,
		AttrNumber *	confkey,
		Oid *	pf_eq_oprs,
		Oid *	pp_eq_oprs,
		Oid *	ff_eq_oprs
	)

Definition at line 1164 of file pg_constraint.c.

References ARR_DATA_PTR, ARR_DIMS, ARR_ELEMTYPE, ARR_HASNULL, ARR_NDIM, CONSTROID, DatumGetArrayTypeP, DatumGetPointer, elog, ERROR, GETSTRUCT, INDEX_MAX_KEYS, pfree(), and SysCacheGetAttr().

Referenced by CloneFkReferenced(), CloneFkReferencing(), RelationGetFKeyList(), and ri_LoadConstraintInfo().

{
    Oid         constrId;
    Datum       adatum;
    bool        isNull;
    ArrayType  *arr;
    int         numkeys;

    constrId = ((Form_pg_constraint) GETSTRUCT(tuple))->oid;

    /*
     * We expect the arrays to be 1-D arrays of the right types; verify that.
     * We don't need to use deconstruct_array() since the array data is just
     * going to look like a C array of values.
     */
    adatum = SysCacheGetAttr(CONSTROID, tuple,
                             Anum_pg_constraint_conkey, &isNull);
    if (isNull)
        elog(ERROR, "null conkey for constraint %u", constrId);
    arr = DatumGetArrayTypeP(adatum);   /* ensure not toasted */
    if (ARR_NDIM(arr) != 1 ||
        ARR_HASNULL(arr) ||
        ARR_ELEMTYPE(arr) != INT2OID)
        elog(ERROR, "conkey is not a 1-D smallint array");
    numkeys = ARR_DIMS(arr)[0];
    if (numkeys <= 0 || numkeys > INDEX_MAX_KEYS)
        elog(ERROR, "foreign key constraint cannot have %d columns", numkeys);
    memcpy(conkey, ARR_DATA_PTR(arr), numkeys * sizeof(int16));
    if ((Pointer) arr != DatumGetPointer(adatum))
        pfree(arr);             /* free de-toasted copy, if any */

    adatum = SysCacheGetAttr(CONSTROID, tuple,
                             Anum_pg_constraint_confkey, &isNull);
    if (isNull)
        elog(ERROR, "null confkey for constraint %u", constrId);
    arr = DatumGetArrayTypeP(adatum);   /* ensure not toasted */
    if (ARR_NDIM(arr) != 1 ||
        ARR_DIMS(arr)[0] != numkeys ||
        ARR_HASNULL(arr) ||
        ARR_ELEMTYPE(arr) != INT2OID)
        elog(ERROR, "confkey is not a 1-D smallint array");
    memcpy(confkey, ARR_DATA_PTR(arr), numkeys * sizeof(int16));
    if ((Pointer) arr != DatumGetPointer(adatum))
        pfree(arr);             /* free de-toasted copy, if any */

    if (pf_eq_oprs)
    {
        adatum = SysCacheGetAttr(CONSTROID, tuple,
                                 Anum_pg_constraint_conpfeqop, &isNull);
        if (isNull)
            elog(ERROR, "null conpfeqop for constraint %u", constrId);
        arr = DatumGetArrayTypeP(adatum);   /* ensure not toasted */
        /* see TryReuseForeignKey if you change the test below */
        if (ARR_NDIM(arr) != 1 ||
            ARR_DIMS(arr)[0] != numkeys ||
            ARR_HASNULL(arr) ||
            ARR_ELEMTYPE(arr) != OIDOID)
            elog(ERROR, "conpfeqop is not a 1-D Oid array");
        memcpy(pf_eq_oprs, ARR_DATA_PTR(arr), numkeys * sizeof(Oid));
        if ((Pointer) arr != DatumGetPointer(adatum))
            pfree(arr);         /* free de-toasted copy, if any */
    }

    if (pp_eq_oprs)
    {
        adatum = SysCacheGetAttr(CONSTROID, tuple,
                                 Anum_pg_constraint_conppeqop, &isNull);
        if (isNull)
            elog(ERROR, "null conppeqop for constraint %u", constrId);
        arr = DatumGetArrayTypeP(adatum);   /* ensure not toasted */
        if (ARR_NDIM(arr) != 1 ||
            ARR_DIMS(arr)[0] != numkeys ||
            ARR_HASNULL(arr) ||
            ARR_ELEMTYPE(arr) != OIDOID)
            elog(ERROR, "conppeqop is not a 1-D Oid array");
        memcpy(pp_eq_oprs, ARR_DATA_PTR(arr), numkeys * sizeof(Oid));
        if ((Pointer) arr != DatumGetPointer(adatum))
            pfree(arr);         /* free de-toasted copy, if any */
    }

    if (ff_eq_oprs)
    {
        adatum = SysCacheGetAttr(CONSTROID, tuple,
                                 Anum_pg_constraint_conffeqop, &isNull);
        if (isNull)
            elog(ERROR, "null conffeqop for constraint %u", constrId);
        arr = DatumGetArrayTypeP(adatum);   /* ensure not toasted */
        if (ARR_NDIM(arr) != 1 ||
            ARR_DIMS(arr)[0] != numkeys ||
            ARR_HASNULL(arr) ||
            ARR_ELEMTYPE(arr) != OIDOID)
            elog(ERROR, "conffeqop is not a 1-D Oid array");
        memcpy(ff_eq_oprs, ARR_DATA_PTR(arr), numkeys * sizeof(Oid));
        if ((Pointer) arr != DatumGetPointer(adatum))
            pfree(arr);         /* free de-toasted copy, if any */
    }

    *numfks = numkeys;
}

get_domain_constraint_oid()

Oid get_domain_constraint_oid	(	Oid	typid,
		const char *	conname,
		bool	missing_ok
	)

Definition at line 1020 of file pg_constraint.c.

References AccessShareLock, BTEqualStrategyNumber, ConstraintRelidTypidNameIndexId, CStringGetDatum, ereport, errcode(), errmsg(), ERROR, format_type_be(), GETSTRUCT, HeapTupleIsValid, InvalidOid, ObjectIdGetDatum, OidIsValid, ScanKeyInit(), systable_beginscan(), systable_endscan(), systable_getnext(), table_close(), and table_open().

Referenced by get_object_address(), and rename_constraint_internal().

{
    Relation    pg_constraint;
    HeapTuple   tuple;
    SysScanDesc scan;
    ScanKeyData skey[3];
    Oid         conOid = InvalidOid;

    pg_constraint = table_open(ConstraintRelationId, AccessShareLock);

    ScanKeyInit(&skey[0],
                Anum_pg_constraint_conrelid,
                BTEqualStrategyNumber, F_OIDEQ,
                ObjectIdGetDatum(InvalidOid));
    ScanKeyInit(&skey[1],
                Anum_pg_constraint_contypid,
                BTEqualStrategyNumber, F_OIDEQ,
                ObjectIdGetDatum(typid));
    ScanKeyInit(&skey[2],
                Anum_pg_constraint_conname,
                BTEqualStrategyNumber, F_NAMEEQ,
                CStringGetDatum(conname));

    scan = systable_beginscan(pg_constraint, ConstraintRelidTypidNameIndexId, true,
                              NULL, 3, skey);

    /* There can be at most one matching row */
    if (HeapTupleIsValid(tuple = systable_getnext(scan)))
        conOid = ((Form_pg_constraint) GETSTRUCT(tuple))->oid;

    systable_endscan(scan);

    /* If no such constraint exists, complain */
    if (!OidIsValid(conOid) && !missing_ok)
        ereport(ERROR,
                (errcode(ERRCODE_UNDEFINED_OBJECT),
                 errmsg("constraint \"%s\" for domain %s does not exist",
                        conname, format_type_be(typid))));

    table_close(pg_constraint, AccessShareLock);

    return conOid;
}

get_primary_key_attnos()

Bitmapset* get_primary_key_attnos	(	Oid	relid,
		bool	deferrableOk,
		Oid *	constraintOid
	)

Definition at line 1079 of file pg_constraint.c.

References AccessShareLock, ARR_DATA_PTR, ARR_DIMS, ARR_ELEMTYPE, ARR_HASNULL, ARR_NDIM, bms_add_member(), BTEqualStrategyNumber, ConstraintRelidTypidNameIndexId, DatumGetArrayTypeP, elog, ERROR, FirstLowInvalidHeapAttributeNumber, GETSTRUCT, heap_getattr, HeapTupleIsValid, i, InvalidOid, ObjectIdGetDatum, RelationGetDescr, ScanKeyInit(), systable_beginscan(), systable_endscan(), systable_getnext(), table_close(), and table_open().

Referenced by check_functional_grouping(), and remove_useless_groupby_columns().

{
    Bitmapset  *pkattnos = NULL;
    Relation    pg_constraint;
    HeapTuple   tuple;
    SysScanDesc scan;
    ScanKeyData skey[1];

    /* Set *constraintOid, to avoid complaints about uninitialized vars */
    *constraintOid = InvalidOid;

    /* Scan pg_constraint for constraints of the target rel */
    pg_constraint = table_open(ConstraintRelationId, AccessShareLock);

    ScanKeyInit(&skey[0],
                Anum_pg_constraint_conrelid,
                BTEqualStrategyNumber, F_OIDEQ,
                ObjectIdGetDatum(relid));

    scan = systable_beginscan(pg_constraint, ConstraintRelidTypidNameIndexId, true,
                              NULL, 1, skey);

    while (HeapTupleIsValid(tuple = systable_getnext(scan)))
    {
        Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(tuple);
        Datum       adatum;
        bool        isNull;
        ArrayType  *arr;
        int16      *attnums;
        int         numkeys;
        int         i;

        /* Skip constraints that are not PRIMARY KEYs */
        if (con->contype != CONSTRAINT_PRIMARY)
            continue;

        /*
         * If the primary key is deferrable, but we've been instructed to
         * ignore deferrable constraints, then we might as well give up
         * searching, since there can only be a single primary key on a table.
         */
        if (con->condeferrable && !deferrableOk)
            break;

        /* Extract the conkey array, ie, attnums of PK's columns */
        adatum = heap_getattr(tuple, Anum_pg_constraint_conkey,
                              RelationGetDescr(pg_constraint), &isNull);
        if (isNull)
            elog(ERROR, "null conkey for constraint %u",
                 ((Form_pg_constraint) GETSTRUCT(tuple))->oid);
        arr = DatumGetArrayTypeP(adatum);   /* ensure not toasted */
        numkeys = ARR_DIMS(arr)[0];
        if (ARR_NDIM(arr) != 1 ||
            numkeys < 0 ||
            ARR_HASNULL(arr) ||
            ARR_ELEMTYPE(arr) != INT2OID)
            elog(ERROR, "conkey is not a 1-D smallint array");
        attnums = (int16 *) ARR_DATA_PTR(arr);

        /* Construct the result value */
        for (i = 0; i < numkeys; i++)
        {
            pkattnos = bms_add_member(pkattnos,
                                      attnums[i] - FirstLowInvalidHeapAttributeNumber);
        }
        *constraintOid = ((Form_pg_constraint) GETSTRUCT(tuple))->oid;

        /* No need to search further */
        break;
    }

    systable_endscan(scan);

    table_close(pg_constraint, AccessShareLock);

    return pkattnos;
}

get_relation_constraint_attnos()

Bitmapset* get_relation_constraint_attnos	(	Oid	relid,
		const char *	conname,
		bool	missing_ok,
		Oid *	constraintOid
	)

Definition at line 895 of file pg_constraint.c.

References AccessShareLock, ARR_DATA_PTR, ARR_DIMS, ARR_ELEMTYPE, ARR_HASNULL, ARR_NDIM, bms_add_member(), BTEqualStrategyNumber, ConstraintRelidTypidNameIndexId, CStringGetDatum, DatumGetArrayTypeP, elog, ereport, errcode(), errmsg(), ERROR, FirstLowInvalidHeapAttributeNumber, get_rel_name(), GETSTRUCT, heap_getattr, HeapTupleIsValid, i, InvalidOid, ObjectIdGetDatum, OidIsValid, RelationGetDescr, ScanKeyInit(), systable_beginscan(), systable_endscan(), systable_getnext(), table_close(), and table_open().

Referenced by transformOnConflictArbiter().

{
    Bitmapset  *conattnos = NULL;
    Relation    pg_constraint;
    HeapTuple   tuple;
    SysScanDesc scan;
    ScanKeyData skey[3];

    /* Set *constraintOid, to avoid complaints about uninitialized vars */
    *constraintOid = InvalidOid;

    pg_constraint = table_open(ConstraintRelationId, AccessShareLock);

    ScanKeyInit(&skey[0],
                Anum_pg_constraint_conrelid,
                BTEqualStrategyNumber, F_OIDEQ,
                ObjectIdGetDatum(relid));
    ScanKeyInit(&skey[1],
                Anum_pg_constraint_contypid,
                BTEqualStrategyNumber, F_OIDEQ,
                ObjectIdGetDatum(InvalidOid));
    ScanKeyInit(&skey[2],
                Anum_pg_constraint_conname,
                BTEqualStrategyNumber, F_NAMEEQ,
                CStringGetDatum(conname));

    scan = systable_beginscan(pg_constraint, ConstraintRelidTypidNameIndexId, true,
                              NULL, 3, skey);

    /* There can be at most one matching row */
    if (HeapTupleIsValid(tuple = systable_getnext(scan)))
    {
        Datum       adatum;
        bool        isNull;

        *constraintOid = ((Form_pg_constraint) GETSTRUCT(tuple))->oid;

        /* Extract the conkey array, ie, attnums of constrained columns */
        adatum = heap_getattr(tuple, Anum_pg_constraint_conkey,
                              RelationGetDescr(pg_constraint), &isNull);
        if (!isNull)
        {
            ArrayType  *arr;
            int         numcols;
            int16      *attnums;
            int         i;

            arr = DatumGetArrayTypeP(adatum);   /* ensure not toasted */
            numcols = ARR_DIMS(arr)[0];
            if (ARR_NDIM(arr) != 1 ||
                numcols < 0 ||
                ARR_HASNULL(arr) ||
                ARR_ELEMTYPE(arr) != INT2OID)
                elog(ERROR, "conkey is not a 1-D smallint array");
            attnums = (int16 *) ARR_DATA_PTR(arr);

            /* Construct the result value */
            for (i = 0; i < numcols; i++)
            {
                conattnos = bms_add_member(conattnos,
                                           attnums[i] - FirstLowInvalidHeapAttributeNumber);
            }
        }
    }

    systable_endscan(scan);

    /* If no such constraint exists, complain */
    if (!OidIsValid(*constraintOid) && !missing_ok)
        ereport(ERROR,
                (errcode(ERRCODE_UNDEFINED_OBJECT),
                 errmsg("constraint \"%s\" for table \"%s\" does not exist",
                        conname, get_rel_name(relid))));

    table_close(pg_constraint, AccessShareLock);

    return conattnos;
}

get_relation_constraint_oid()

Oid get_relation_constraint_oid	(	Oid	relid,
		const char *	conname,
		bool	missing_ok
	)

Definition at line 838 of file pg_constraint.c.

References AccessShareLock, BTEqualStrategyNumber, ConstraintRelidTypidNameIndexId, CStringGetDatum, ereport, errcode(), errmsg(), ERROR, get_rel_name(), GETSTRUCT, HeapTupleIsValid, InvalidOid, ObjectIdGetDatum, OidIsValid, ScanKeyInit(), systable_beginscan(), systable_endscan(), systable_getnext(), table_close(), and table_open().

Referenced by expandTableLikeClause(), get_object_address_relobject(), and rename_constraint_internal().

{
    Relation    pg_constraint;
    HeapTuple   tuple;
    SysScanDesc scan;
    ScanKeyData skey[3];
    Oid         conOid = InvalidOid;

    pg_constraint = table_open(ConstraintRelationId, AccessShareLock);

    ScanKeyInit(&skey[0],
                Anum_pg_constraint_conrelid,
                BTEqualStrategyNumber, F_OIDEQ,
                ObjectIdGetDatum(relid));
    ScanKeyInit(&skey[1],
                Anum_pg_constraint_contypid,
                BTEqualStrategyNumber, F_OIDEQ,
                ObjectIdGetDatum(InvalidOid));
    ScanKeyInit(&skey[2],
                Anum_pg_constraint_conname,
                BTEqualStrategyNumber, F_NAMEEQ,
                CStringGetDatum(conname));

    scan = systable_beginscan(pg_constraint, ConstraintRelidTypidNameIndexId, true,
                              NULL, 3, skey);

    /* There can be at most one matching row */
    if (HeapTupleIsValid(tuple = systable_getnext(scan)))
        conOid = ((Form_pg_constraint) GETSTRUCT(tuple))->oid;

    systable_endscan(scan);

    /* If no such constraint exists, complain */
    if (!OidIsValid(conOid) && !missing_ok)
        ereport(ERROR,
                (errcode(ERRCODE_UNDEFINED_OBJECT),
                 errmsg("constraint \"%s\" for table \"%s\" does not exist",
                        conname, get_rel_name(relid))));

    table_close(pg_constraint, AccessShareLock);

    return conOid;
}

get_relation_idx_constraint_oid()

Oid get_relation_idx_constraint_oid	(	Oid	relationId,
		Oid	indexId
	)

Definition at line 980 of file pg_constraint.c.

References AccessShareLock, BTEqualStrategyNumber, ConstraintRelidTypidNameIndexId, GETSTRUCT, InvalidOid, sort-test::key, ObjectIdGetDatum, ScanKeyInit(), systable_beginscan(), systable_endscan(), systable_getnext(), table_close(), and table_open().

Referenced by ATExecAttachPartitionIdx(), ATExecDetachPartition(), AttachPartitionEnsureIndexes(), and DefineIndex().

{
    Relation    pg_constraint;
    SysScanDesc scan;
    ScanKeyData key;
    HeapTuple   tuple;
    Oid         constraintId = InvalidOid;

    pg_constraint = table_open(ConstraintRelationId, AccessShareLock);

    ScanKeyInit(&key,
                Anum_pg_constraint_conrelid,
                BTEqualStrategyNumber,
                F_OIDEQ,
                ObjectIdGetDatum(relationId));
    scan = systable_beginscan(pg_constraint, ConstraintRelidTypidNameIndexId,
                              true, NULL, 1, &key);
    while ((tuple = systable_getnext(scan)) != NULL)
    {
        Form_pg_constraint constrForm;

        constrForm = (Form_pg_constraint) GETSTRUCT(tuple);
        if (constrForm->conindid == indexId)
        {
            constraintId = constrForm->oid;
            break;
        }
    }
    systable_endscan(scan);

    table_close(pg_constraint, AccessShareLock);
    return constraintId;
}

RemoveConstraintById()

void RemoveConstraintById

(

Oid

conId

)

Definition at line 557 of file pg_constraint.c.

References AccessExclusiveLock, CatalogTupleDelete(), CatalogTupleUpdate(), CONSTROID, elog, ERROR, GETSTRUCT, heap_freetuple(), HeapTupleIsValid, NoLock, ObjectIdGetDatum, OidIsValid, RelationGetRelationName, ReleaseSysCache(), RELOID, RowExclusiveLock, SearchSysCache1(), SearchSysCacheCopy1, HeapTupleData::t_self, table_close(), and table_open().

Referenced by doDeletion().

{
    Relation    conDesc;
    HeapTuple   tup;
    Form_pg_constraint con;

    conDesc = table_open(ConstraintRelationId, RowExclusiveLock);

    tup = SearchSysCache1(CONSTROID, ObjectIdGetDatum(conId));
    if (!HeapTupleIsValid(tup)) /* should not happen */
        elog(ERROR, "cache lookup failed for constraint %u", conId);
    con = (Form_pg_constraint) GETSTRUCT(tup);

    /*
     * Special processing depending on what the constraint is for.
     */
    if (OidIsValid(con->conrelid))
    {
        Relation    rel;

        /*
         * If the constraint is for a relation, open and exclusive-lock the
         * relation it's for.
         */
        rel = table_open(con->conrelid, AccessExclusiveLock);

        /*
         * We need to update the relchecks count if it is a check constraint
         * being dropped.  This update will force backends to rebuild relcache
         * entries when we commit.
         */
        if (con->contype == CONSTRAINT_CHECK)
        {
            Relation    pgrel;
            HeapTuple   relTup;
            Form_pg_class classForm;

            pgrel = table_open(RelationRelationId, RowExclusiveLock);
            relTup = SearchSysCacheCopy1(RELOID,
                                         ObjectIdGetDatum(con->conrelid));
            if (!HeapTupleIsValid(relTup))
                elog(ERROR, "cache lookup failed for relation %u",
                     con->conrelid);
            classForm = (Form_pg_class) GETSTRUCT(relTup);

            if (classForm->relchecks == 0)  /* should not happen */
                elog(ERROR, "relation \"%s\" has relchecks = 0",
                     RelationGetRelationName(rel));
            classForm->relchecks--;

            CatalogTupleUpdate(pgrel, &relTup->t_self, relTup);

            heap_freetuple(relTup);

            table_close(pgrel, RowExclusiveLock);
        }

        /* Keep lock on constraint's rel until end of xact */
        table_close(rel, NoLock);
    }
    else if (OidIsValid(con->contypid))
    {
        /*
         * XXX for now, do nothing special when dropping a domain constraint
         *
         * Probably there should be some form of locking on the domain type,
         * but we have no such concept at the moment.
         */
    }
    else
        elog(ERROR, "constraint %u is not of a known type", conId);

    /* Fry the constraint itself */
    CatalogTupleDelete(conDesc, &tup->t_self);

    /* Clean up */
    ReleaseSysCache(tup);
    table_close(conDesc, RowExclusiveLock);
}

RenameConstraintById()

void RenameConstraintById	(	Oid	conId,
		const char *	newname
	)

Definition at line 648 of file pg_constraint.c.

References CatalogTupleUpdate(), CONSTRAINT_DOMAIN, CONSTRAINT_RELATION, ConstraintNameIsUsed(), CONSTROID, elog, ereport, errcode(), ERRCODE_DUPLICATE_OBJECT, errmsg(), ERROR, format_type_be(), get_rel_name(), GETSTRUCT, heap_freetuple(), HeapTupleIsValid, InvokeObjectPostAlterHook, namestrcpy(), ObjectIdGetDatum, OidIsValid, RowExclusiveLock, SearchSysCacheCopy1, HeapTupleData::t_self, table_close(), and table_open().

Referenced by rename_constraint_internal(), and RenameRelationInternal().

{
    Relation    conDesc;
    HeapTuple   tuple;
    Form_pg_constraint con;

    conDesc = table_open(ConstraintRelationId, RowExclusiveLock);

    tuple = SearchSysCacheCopy1(CONSTROID, ObjectIdGetDatum(conId));
    if (!HeapTupleIsValid(tuple))
        elog(ERROR, "cache lookup failed for constraint %u", conId);
    con = (Form_pg_constraint) GETSTRUCT(tuple);

    /*
     * For user-friendliness, check whether the name is already in use.
     */
    if (OidIsValid(con->conrelid) &&
        ConstraintNameIsUsed(CONSTRAINT_RELATION,
                             con->conrelid,
                             newname))
        ereport(ERROR,
                (errcode(ERRCODE_DUPLICATE_OBJECT),
                 errmsg("constraint \"%s\" for relation \"%s\" already exists",
                        newname, get_rel_name(con->conrelid))));
    if (OidIsValid(con->contypid) &&
        ConstraintNameIsUsed(CONSTRAINT_DOMAIN,
                             con->contypid,
                             newname))
        ereport(ERROR,
                (errcode(ERRCODE_DUPLICATE_OBJECT),
                 errmsg("constraint \"%s\" for domain %s already exists",
                        newname, format_type_be(con->contypid))));

    /* OK, do the rename --- tuple is a copy, so OK to scribble on it */
    namestrcpy(&(con->conname), newname);

    CatalogTupleUpdate(conDesc, &tuple->t_self, tuple);

    InvokeObjectPostAlterHook(ConstraintRelationId, conId, 0);

    heap_freetuple(tuple);
    table_close(conDesc, RowExclusiveLock);
}

Variable Documentation

FormData_pg_constraint

FormData_pg_constraint

Definition at line 147 of file pg_constraint.h.