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e26c539e9f
The purpose of this change is to eliminate the need for every caller of SearchSysCache, SearchSysCacheCopy, SearchSysCacheExists, GetSysCacheOid, and SearchSysCacheList to know the maximum number of allowable keys for a syscache entry (currently 4). This will make it far easier to increase the maximum number of keys in a future release should we choose to do so, and it makes the code shorter, too. Design and review by Tom Lane.
153 lines
3.7 KiB
C
153 lines
3.7 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) 1996-2010, 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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* $PostgreSQL: pgsql/src/backend/rewrite/rewriteRemove.c,v 1.80 2010/02/14 18:42:15 rhaas 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/genam.h"
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#include "access/heapam.h"
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#include "access/sysattr.h"
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#include "catalog/dependency.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/acl.h"
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#include "utils/fmgroids.h"
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#include "utils/inval.h"
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#include "utils/lsyscache.h"
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#include "utils/rel.h"
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#include "utils/syscache.h"
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#include "utils/tqual.h"
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/*
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* RemoveRewriteRule
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*
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* Delete a rule given its name.
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*/
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void
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RemoveRewriteRule(Oid owningRel, const char *ruleName, DropBehavior behavior,
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bool missing_ok)
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{
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HeapTuple tuple;
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Oid eventRelationOid;
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ObjectAddress object;
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/*
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* Find the tuple for the target rule.
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*/
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tuple = SearchSysCache2(RULERELNAME,
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ObjectIdGetDatum(owningRel),
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PointerGetDatum(ruleName));
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/*
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* complain if no rule with such name exists
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*/
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if (!HeapTupleIsValid(tuple))
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{
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if (!missing_ok)
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ereport(ERROR,
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(errcode(ERRCODE_UNDEFINED_OBJECT),
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errmsg("rule \"%s\" for relation \"%s\" does not exist",
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ruleName, get_rel_name(owningRel))));
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else
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ereport(NOTICE,
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(errmsg("rule \"%s\" for relation \"%s\" does not exist, skipping",
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ruleName, get_rel_name(owningRel))));
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return;
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}
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/*
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* Verify user has appropriate permissions.
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*/
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eventRelationOid = ((Form_pg_rewrite) GETSTRUCT(tuple))->ev_class;
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Assert(eventRelationOid == owningRel);
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if (!pg_class_ownercheck(eventRelationOid, GetUserId()))
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aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_CLASS,
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get_rel_name(eventRelationOid));
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/*
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* Do the deletion
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*/
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object.classId = RewriteRelationId;
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object.objectId = HeapTupleGetOid(tuple);
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object.objectSubId = 0;
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ReleaseSysCache(tuple);
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performDeletion(&object, behavior);
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}
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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 = heap_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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ObjectIdAttributeNumber,
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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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SnapshotNow, 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 = heap_open(eventRelationOid, AccessExclusiveLock);
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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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simple_heap_delete(RewriteRelation, &tuple->t_self);
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systable_endscan(rcscan);
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heap_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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heap_close(event_relation, NoLock);
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}
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