PostgreSQL Source Code  git master
rewriteSupport.c File Reference
#include "postgres.h"
#include "access/htup_details.h"
#include "access/table.h"
#include "catalog/indexing.h"
#include "catalog/pg_class.h"
#include "catalog/pg_rewrite.h"
#include "rewrite/rewriteSupport.h"
#include "utils/inval.h"
#include "utils/lsyscache.h"
#include "utils/syscache.h"
Include dependency graph for rewriteSupport.c:

Go to the source code of this file.

Functions

bool IsDefinedRewriteRule (Oid owningRel, const char *ruleName)
 
void SetRelationRuleStatus (Oid relationId, bool relHasRules)
 
Oid get_rewrite_oid (Oid relid, const char *rulename, bool missing_ok)
 

Function Documentation

◆ get_rewrite_oid()

Oid get_rewrite_oid ( Oid  relid,
const char *  rulename,
bool  missing_ok 
)

Definition at line 92 of file rewriteSupport.c.

93 {
94  HeapTuple tuple;
95  Form_pg_rewrite ruleform;
96  Oid ruleoid;
97 
98  /* Find the rule's pg_rewrite tuple, get its OID */
99  tuple = SearchSysCache2(RULERELNAME,
100  ObjectIdGetDatum(relid),
101  PointerGetDatum(rulename));
102  if (!HeapTupleIsValid(tuple))
103  {
104  if (missing_ok)
105  return InvalidOid;
106  ereport(ERROR,
107  (errcode(ERRCODE_UNDEFINED_OBJECT),
108  errmsg("rule \"%s\" for relation \"%s\" does not exist",
109  rulename, get_rel_name(relid))));
110  }
111  ruleform = (Form_pg_rewrite) GETSTRUCT(tuple);
112  Assert(relid == ruleform->ev_class);
113  ruleoid = ruleform->oid;
114  ReleaseSysCache(tuple);
115  return ruleoid;
116 }
int errcode(int sqlerrcode)
Definition: elog.c:859
int errmsg(const char *fmt,...)
Definition: elog.c:1072
#define ERROR
Definition: elog.h:39
#define ereport(elevel,...)
Definition: elog.h:149
#define HeapTupleIsValid(tuple)
Definition: htup.h:78
#define GETSTRUCT(TUP)
Definition: htup_details.h:653
Assert(fmt[strlen(fmt) - 1] !='\n')
char * get_rel_name(Oid relid)
Definition: lsyscache.c:1906
FormData_pg_rewrite * Form_pg_rewrite
Definition: pg_rewrite.h:52
static Datum PointerGetDatum(const void *X)
Definition: postgres.h:322
static Datum ObjectIdGetDatum(Oid X)
Definition: postgres.h:252
#define InvalidOid
Definition: postgres_ext.h:36
unsigned int Oid
Definition: postgres_ext.h:31
void ReleaseSysCache(HeapTuple tuple)
Definition: syscache.c:266
HeapTuple SearchSysCache2(int cacheId, Datum key1, Datum key2)
Definition: syscache.c:229

References Assert(), ereport, errcode(), errmsg(), ERROR, get_rel_name(), GETSTRUCT, HeapTupleIsValid, InvalidOid, ObjectIdGetDatum(), PointerGetDatum(), ReleaseSysCache(), and SearchSysCache2().

Referenced by get_object_address_relobject().

◆ IsDefinedRewriteRule()

bool IsDefinedRewriteRule ( Oid  owningRel,
const char *  ruleName 
)

Definition at line 32 of file rewriteSupport.c.

33 {
34  return SearchSysCacheExists2(RULERELNAME,
35  ObjectIdGetDatum(owningRel),
36  PointerGetDatum(ruleName));
37 }
#define SearchSysCacheExists2(cacheId, key1, key2)
Definition: syscache.h:97

References ObjectIdGetDatum(), PointerGetDatum(), and SearchSysCacheExists2.

Referenced by RenameRewriteRule().

◆ SetRelationRuleStatus()

void SetRelationRuleStatus ( Oid  relationId,
bool  relHasRules 
)

Definition at line 53 of file rewriteSupport.c.

54 {
55  Relation relationRelation;
56  HeapTuple tuple;
57  Form_pg_class classForm;
58 
59  /*
60  * Find the tuple to update in pg_class, using syscache for the lookup.
61  */
62  relationRelation = table_open(RelationRelationId, RowExclusiveLock);
63  tuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relationId));
64  if (!HeapTupleIsValid(tuple))
65  elog(ERROR, "cache lookup failed for relation %u", relationId);
66  classForm = (Form_pg_class) GETSTRUCT(tuple);
67 
68  if (classForm->relhasrules != relHasRules)
69  {
70  /* Do the update */
71  classForm->relhasrules = relHasRules;
72 
73  CatalogTupleUpdate(relationRelation, &tuple->t_self, tuple);
74  }
75  else
76  {
77  /* no need to change tuple, but force relcache rebuild anyway */
79  }
80 
81  heap_freetuple(tuple);
82  table_close(relationRelation, RowExclusiveLock);
83 }
#define elog(elevel,...)
Definition: elog.h:224
void heap_freetuple(HeapTuple htup)
Definition: heaptuple.c:1434
void CatalogTupleUpdate(Relation heapRel, ItemPointer otid, HeapTuple tup)
Definition: indexing.c:313
void CacheInvalidateRelcacheByTuple(HeapTuple classTuple)
Definition: inval.c:1396
#define RowExclusiveLock
Definition: lockdefs.h:38
FormData_pg_class * Form_pg_class
Definition: pg_class.h:153
ItemPointerData t_self
Definition: htup.h:65
#define SearchSysCacheCopy1(cacheId, key1)
Definition: syscache.h:86
void table_close(Relation relation, LOCKMODE lockmode)
Definition: table.c:126
Relation table_open(Oid relationId, LOCKMODE lockmode)
Definition: table.c:40

References CacheInvalidateRelcacheByTuple(), CatalogTupleUpdate(), elog, ERROR, GETSTRUCT, heap_freetuple(), HeapTupleIsValid, ObjectIdGetDatum(), RowExclusiveLock, SearchSysCacheCopy1, HeapTupleData::t_self, table_close(), and table_open().

Referenced by DefineQueryRewrite().