postgresql/src/backend/rewrite/rewriteSupport.c

77 lines
2.3 KiB
C

/*-------------------------------------------------------------------------
*
* rewriteSupport.c
*
*
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteSupport.c,v 1.43 2000/06/30 07:04:23 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/heapam.h"
#include "catalog/catname.h"
#include "catalog/indexing.h"
#include "rewrite/rewriteSupport.h"
#include "utils/catcache.h"
#include "utils/syscache.h"
int
IsDefinedRewriteRule(char *ruleName)
{
HeapTuple tuple;
tuple = SearchSysCacheTuple(RULENAME,
PointerGetDatum(ruleName),
0, 0, 0);
return HeapTupleIsValid(tuple);
}
/*
* setRelhasrulesInRelation
* Set the value of the relation's relhasrules field in pg_class.
*
* NOTE: caller should be holding an appropriate lock on the relation.
*
* NOTE: an important side-effect of this operation is that an SI invalidation
* message is sent out to all backends --- including me --- causing relcache
* entries to be flushed or updated with the new set of rules for the table.
* Therefore, we execute the update even if relhasrules has the right value
* already. Possible future improvement: skip the disk update and just send
* an SI message in that case.
*/
void
setRelhasrulesInRelation(Oid relationId, bool relhasrules)
{
Relation relationRelation;
HeapTuple tuple;
Relation idescs[Num_pg_class_indices];
/*
* Find the tuple to update in pg_class, using syscache for the lookup.
*/
relationRelation = heap_openr(RelationRelationName, RowExclusiveLock);
tuple = SearchSysCacheTupleCopy(RELOID,
ObjectIdGetDatum(relationId),
0, 0, 0);
Assert(HeapTupleIsValid(tuple));
/* Do the update */
((Form_pg_class) GETSTRUCT(tuple))->relhasrules = relhasrules;
heap_update(relationRelation, &tuple->t_self, tuple, NULL);
/* Keep the catalog indices up to date */
CatalogOpenIndices(Num_pg_class_indices, Name_pg_class_indices, idescs);
CatalogIndexInsert(idescs, Num_pg_class_indices, relationRelation, tuple);
CatalogCloseIndices(Num_pg_class_indices, idescs);
heap_freetuple(tuple);
heap_close(relationRelation, RowExclusiveLock);
}