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/*-------------------------------------------------------------------------
*
* rewriteSupport.c
*
*
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteSupport.c,v 1.48 2001/03/22 03:59:44 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/heapam.h"
#include "catalog/catname.h"
#include "catalog/indexing.h"
#include "rewrite/rewriteSupport.h"
#include "utils/syscache.h"
bool
IsDefinedRewriteRule(char *ruleName)
{
return SearchSysCacheExists(RULENAME,
PointerGetDatum(ruleName),
0, 0, 0);
}
/*
* SetRelationRuleStatus
* Set the value of the relation's relhasrules field in pg_class;
* if the relation is becoming a view, also adjust its relkind.
*
* NOTE: caller must 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
SetRelationRuleStatus(Oid relationId, bool relHasRules,
bool relIsBecomingView)
{
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 = SearchSysCacheCopy(RELOID,
ObjectIdGetDatum(relationId),
0, 0, 0);
if (!HeapTupleIsValid(tuple))
elog(ERROR, "SetRelationRuleStatus: cache lookup failed for relation %u", relationId);
/* Do the update */
((Form_pg_class) GETSTRUCT(tuple))->relhasrules = relHasRules;
if (relIsBecomingView)
((Form_pg_class) GETSTRUCT(tuple))->relkind = RELKIND_VIEW;
simple_heap_update(relationRelation, &tuple->t_self, tuple);
/* 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);
}
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