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85 lines
2.6 KiB
C
85 lines
2.6 KiB
C
/*-------------------------------------------------------------------------
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*
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* rewriteSupport.c
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*
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*
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* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteSupport.c,v 1.51 2002/04/19 23:13:54 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "access/heapam.h"
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#include "catalog/catname.h"
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#include "catalog/indexing.h"
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#include "rewrite/rewriteSupport.h"
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#include "utils/syscache.h"
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/*
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* Is there a rule by the given name?
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*/
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bool
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IsDefinedRewriteRule(Oid owningRel, const char *ruleName)
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{
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return SearchSysCacheExists(RULERELNAME,
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ObjectIdGetDatum(owningRel),
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PointerGetDatum(ruleName),
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0, 0);
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}
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/*
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* SetRelationRuleStatus
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* Set the value of the relation's relhasrules field in pg_class;
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* if the relation is becoming a view, also adjust its relkind.
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*
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* NOTE: caller must be holding an appropriate lock on the relation.
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*
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* NOTE: an important side-effect of this operation is that an SI invalidation
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* message is sent out to all backends --- including me --- causing relcache
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* entries to be flushed or updated with the new set of rules for the table.
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* Therefore, we execute the update even if relhasrules has the right value
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* already. Possible future improvement: skip the disk update and just send
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* an SI message in that case.
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*/
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void
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SetRelationRuleStatus(Oid relationId, bool relHasRules,
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bool relIsBecomingView)
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{
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Relation relationRelation;
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HeapTuple tuple;
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Relation idescs[Num_pg_class_indices];
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/*
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* Find the tuple to update in pg_class, using syscache for the
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* lookup.
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*/
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relationRelation = heap_openr(RelationRelationName, RowExclusiveLock);
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tuple = SearchSysCacheCopy(RELOID,
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ObjectIdGetDatum(relationId),
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0, 0, 0);
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if (!HeapTupleIsValid(tuple))
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elog(ERROR, "SetRelationRuleStatus: cache lookup failed for relation %u", relationId);
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/* Do the update */
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((Form_pg_class) GETSTRUCT(tuple))->relhasrules = relHasRules;
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if (relIsBecomingView)
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((Form_pg_class) GETSTRUCT(tuple))->relkind = RELKIND_VIEW;
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simple_heap_update(relationRelation, &tuple->t_self, tuple);
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/* Keep the catalog indices up to date */
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CatalogOpenIndices(Num_pg_class_indices, Name_pg_class_indices, idescs);
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CatalogIndexInsert(idescs, Num_pg_class_indices, relationRelation, tuple);
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CatalogCloseIndices(Num_pg_class_indices, idescs);
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heap_freetuple(tuple);
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heap_close(relationRelation, RowExclusiveLock);
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}
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