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This includes removing tabs after periods in C comments, which was applied to back branches, so this change should not effect backpatching.
175 lines
4.7 KiB
C
175 lines
4.7 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) 1996-2014, 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/rewriteSupport.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/heapam.h"
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#include "access/htup_details.h"
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#include "catalog/indexing.h"
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#include "catalog/pg_rewrite.h"
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#include "rewrite/rewriteSupport.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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* 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 SearchSysCacheExists2(RULERELNAME,
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ObjectIdGetDatum(owningRel),
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PointerGetDatum(ruleName));
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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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*
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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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* This must happen even if we find that no change is needed in the pg_class
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* row.
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*/
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void
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SetRelationRuleStatus(Oid relationId, bool relHasRules)
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{
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Relation relationRelation;
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HeapTuple tuple;
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Form_pg_class classForm;
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/*
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* Find the tuple to update in pg_class, using syscache for the lookup.
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*/
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relationRelation = heap_open(RelationRelationId, RowExclusiveLock);
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tuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relationId));
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if (!HeapTupleIsValid(tuple))
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elog(ERROR, "cache lookup failed for relation %u", relationId);
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classForm = (Form_pg_class) GETSTRUCT(tuple);
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if (classForm->relhasrules != relHasRules)
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{
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/* Do the update */
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classForm->relhasrules = relHasRules;
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simple_heap_update(relationRelation, &tuple->t_self, tuple);
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/* Keep the catalog indexes up to date */
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CatalogUpdateIndexes(relationRelation, tuple);
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}
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else
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{
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/* no need to change tuple, but force relcache rebuild anyway */
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CacheInvalidateRelcacheByTuple(tuple);
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}
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heap_freetuple(tuple);
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heap_close(relationRelation, RowExclusiveLock);
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}
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/*
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* Find rule oid.
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*
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* If missing_ok is false, throw an error if rule name not found. If
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* true, just return InvalidOid.
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*/
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Oid
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get_rewrite_oid(Oid relid, const char *rulename, bool missing_ok)
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{
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HeapTuple tuple;
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Oid ruleoid;
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/* Find the rule's pg_rewrite tuple, get its OID */
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tuple = SearchSysCache2(RULERELNAME,
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ObjectIdGetDatum(relid),
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PointerGetDatum(rulename));
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if (!HeapTupleIsValid(tuple))
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{
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if (missing_ok)
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return InvalidOid;
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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(relid))));
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}
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Assert(relid == ((Form_pg_rewrite) GETSTRUCT(tuple))->ev_class);
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ruleoid = HeapTupleGetOid(tuple);
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ReleaseSysCache(tuple);
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return ruleoid;
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}
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/*
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* Find rule oid, given only a rule name but no rel OID.
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*
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* If there's more than one, it's an error. If there aren't any, that's an
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* error, too. In general, this should be avoided - it is provided to support
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* syntax that is compatible with pre-7.3 versions of PG, where rule names
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* were unique across the entire database.
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*/
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Oid
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get_rewrite_oid_without_relid(const char *rulename,
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Oid *reloid, bool missing_ok)
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{
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Relation RewriteRelation;
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HeapScanDesc scanDesc;
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ScanKeyData scanKeyData;
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HeapTuple htup;
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Oid ruleoid;
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/* Search pg_rewrite for such a rule */
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ScanKeyInit(&scanKeyData,
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Anum_pg_rewrite_rulename,
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BTEqualStrategyNumber, F_NAMEEQ,
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CStringGetDatum(rulename));
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RewriteRelation = heap_open(RewriteRelationId, AccessShareLock);
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scanDesc = heap_beginscan_catalog(RewriteRelation, 1, &scanKeyData);
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htup = heap_getnext(scanDesc, ForwardScanDirection);
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if (!HeapTupleIsValid(htup))
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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\" does not exist", rulename)));
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ruleoid = InvalidOid;
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}
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else
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{
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ruleoid = HeapTupleGetOid(htup);
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if (reloid != NULL)
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*reloid = ((Form_pg_rewrite) GETSTRUCT(htup))->ev_class;
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htup = heap_getnext(scanDesc, ForwardScanDirection);
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if (HeapTupleIsValid(htup))
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ereport(ERROR,
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(errcode(ERRCODE_DUPLICATE_OBJECT),
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errmsg("there are multiple rules named \"%s\"", rulename),
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errhint("Specify a relation name as well as a rule name.")));
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}
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heap_endscan(scanDesc);
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heap_close(RewriteRelation, AccessShareLock);
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return ruleoid;
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}
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