95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
/*-------------------------------------------------------------------------
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*
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* rewriteRemove.c
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* routines for removing rewrite rules
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*
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* Portions Copyright (c) 1996-2024, 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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* src/backend/rewrite/rewriteRemove.c
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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/genam.h"
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#include "access/htup_details.h"
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#include "access/table.h"
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#include "catalog/catalog.h"
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#include "catalog/indexing.h"
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#include "catalog/pg_rewrite.h"
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#include "miscadmin.h"
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#include "rewrite/rewriteRemove.h"
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#include "utils/fmgroids.h"
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#include "utils/inval.h"
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#include "utils/rel.h"
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/*
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* Guts of rule deletion.
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*/
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void
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RemoveRewriteRuleById(Oid ruleOid)
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{
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Relation RewriteRelation;
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ScanKeyData skey[1];
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SysScanDesc rcscan;
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Relation event_relation;
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HeapTuple tuple;
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Oid eventRelationOid;
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/*
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* Open the pg_rewrite relation.
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*/
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RewriteRelation = table_open(RewriteRelationId, RowExclusiveLock);
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/*
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* Find the tuple for the target rule.
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*/
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ScanKeyInit(&skey[0],
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Anum_pg_rewrite_oid,
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BTEqualStrategyNumber, F_OIDEQ,
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ObjectIdGetDatum(ruleOid));
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rcscan = systable_beginscan(RewriteRelation, RewriteOidIndexId, true,
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NULL, 1, skey);
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tuple = systable_getnext(rcscan);
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if (!HeapTupleIsValid(tuple))
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elog(ERROR, "could not find tuple for rule %u", ruleOid);
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/*
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* We had better grab AccessExclusiveLock to ensure that no queries are
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* going on that might depend on this rule. (Note: a weaker lock would
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* suffice if it's not an ON SELECT rule.)
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*/
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eventRelationOid = ((Form_pg_rewrite) GETSTRUCT(tuple))->ev_class;
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event_relation = table_open(eventRelationOid, AccessExclusiveLock);
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if (!allowSystemTableMods && IsSystemRelation(event_relation))
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ereport(ERROR,
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(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
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errmsg("permission denied: \"%s\" is a system catalog",
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RelationGetRelationName(event_relation))));
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/*
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* Now delete the pg_rewrite tuple for the rule
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*/
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CatalogTupleDelete(RewriteRelation, &tuple->t_self);
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systable_endscan(rcscan);
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table_close(RewriteRelation, RowExclusiveLock);
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/*
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* Issue shared-inval notice to force all backends (including me!) to
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* update relcache entries with the new rule set.
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*/
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CacheInvalidateRelcache(event_relation);
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/* Close rel, but keep lock till commit... */
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table_close(event_relation, NoLock);
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}
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