fc6d1006bd
This gets rid of an impressive amount of duplicative code, with only minimal behavior changes. DROP FOREIGN DATA WRAPPER now requires object ownership rather than superuser privileges, matching the documentation we already have. We also eliminate the historical warning about dropping a built-in function as unuseful. All operations are now performed in the same order for all object types handled by dropcmds.c. KaiGai Kohei, with minor revisions by me
93 lines
2.3 KiB
C
93 lines
2.3 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* rewriteRemove.c
|
|
* routines for removing rewrite rules
|
|
*
|
|
* Portions Copyright (c) 1996-2011, PostgreSQL Global Development Group
|
|
* Portions Copyright (c) 1994, Regents of the University of California
|
|
*
|
|
*
|
|
* IDENTIFICATION
|
|
* src/backend/rewrite/rewriteRemove.c
|
|
*
|
|
*-------------------------------------------------------------------------
|
|
*/
|
|
#include "postgres.h"
|
|
|
|
#include "access/genam.h"
|
|
#include "access/heapam.h"
|
|
#include "access/sysattr.h"
|
|
#include "catalog/dependency.h"
|
|
#include "catalog/indexing.h"
|
|
#include "catalog/namespace.h"
|
|
#include "catalog/pg_rewrite.h"
|
|
#include "miscadmin.h"
|
|
#include "rewrite/rewriteRemove.h"
|
|
#include "utils/acl.h"
|
|
#include "utils/fmgroids.h"
|
|
#include "utils/inval.h"
|
|
#include "utils/lsyscache.h"
|
|
#include "utils/syscache.h"
|
|
#include "utils/tqual.h"
|
|
|
|
/*
|
|
* Guts of rule deletion.
|
|
*/
|
|
void
|
|
RemoveRewriteRuleById(Oid ruleOid)
|
|
{
|
|
Relation RewriteRelation;
|
|
ScanKeyData skey[1];
|
|
SysScanDesc rcscan;
|
|
Relation event_relation;
|
|
HeapTuple tuple;
|
|
Oid eventRelationOid;
|
|
|
|
/*
|
|
* Open the pg_rewrite relation.
|
|
*/
|
|
RewriteRelation = heap_open(RewriteRelationId, RowExclusiveLock);
|
|
|
|
/*
|
|
* Find the tuple for the target rule.
|
|
*/
|
|
ScanKeyInit(&skey[0],
|
|
ObjectIdAttributeNumber,
|
|
BTEqualStrategyNumber, F_OIDEQ,
|
|
ObjectIdGetDatum(ruleOid));
|
|
|
|
rcscan = systable_beginscan(RewriteRelation, RewriteOidIndexId, true,
|
|
SnapshotNow, 1, skey);
|
|
|
|
tuple = systable_getnext(rcscan);
|
|
|
|
if (!HeapTupleIsValid(tuple))
|
|
elog(ERROR, "could not find tuple for rule %u", ruleOid);
|
|
|
|
/*
|
|
* We had better grab AccessExclusiveLock to ensure that no queries are
|
|
* going on that might depend on this rule. (Note: a weaker lock would
|
|
* suffice if it's not an ON SELECT rule.)
|
|
*/
|
|
eventRelationOid = ((Form_pg_rewrite) GETSTRUCT(tuple))->ev_class;
|
|
event_relation = heap_open(eventRelationOid, AccessExclusiveLock);
|
|
|
|
/*
|
|
* Now delete the pg_rewrite tuple for the rule
|
|
*/
|
|
simple_heap_delete(RewriteRelation, &tuple->t_self);
|
|
|
|
systable_endscan(rcscan);
|
|
|
|
heap_close(RewriteRelation, RowExclusiveLock);
|
|
|
|
/*
|
|
* Issue shared-inval notice to force all backends (including me!) to
|
|
* update relcache entries with the new rule set.
|
|
*/
|
|
CacheInvalidateRelcache(event_relation);
|
|
|
|
/* Close rel, but keep lock till commit... */
|
|
heap_close(event_relation, NoLock);
|
|
}
|