mirror of
https://git.postgresql.org/git/postgresql.git
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809 lines
22 KiB
C
809 lines
22 KiB
C
/*-------------------------------------------------------------------------
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*
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* trigger.c--
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* PostgreSQL TRIGGERs support code.
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*
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*-------------------------------------------------------------------------
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*/
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#include <string.h>
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#include "postgres.h"
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#include "nodes/parsenodes.h"
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#include "nodes/memnodes.h"
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#include "commands/trigger.h"
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#include "catalog/catalog.h"
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#include "catalog/catname.h"
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#include "catalog/indexing.h"
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#include "catalog/pg_proc.h"
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#include "catalog/pg_language.h"
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#include "catalog/pg_trigger.h"
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#include "access/genam.h"
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#include "access/heapam.h"
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#include "access/valid.h"
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#include "access/xact.h"
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#include "storage/lmgr.h"
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#include "storage/bufmgr.h"
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#include "utils/mcxt.h"
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#include "utils/inval.h"
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#include "utils/builtins.h"
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#ifndef NO_SECURITY
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#include "miscadmin.h"
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#include "utils/acl.h"
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#include "utils/syscache.h"
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#endif
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TriggerData *CurrentTriggerData = NULL;
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void RelationBuildTriggers(Relation relation);
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void FreeTriggerDesc(Relation relation);
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static void DescribeTrigger(TriggerDesc * trigdesc, Trigger * trigger);
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static HeapTuple
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GetTupleForTrigger(Relation relation, ItemPointer tid,
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bool before);
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extern void fmgr_info(Oid procedureId, func_ptr * function, int *nargs);
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extern GlobalMemory CacheCxt;
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void
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CreateTrigger(CreateTrigStmt * stmt)
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{
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int16 tgtype;
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int16 tgattr[8] = {0};
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Datum values[Natts_pg_trigger];
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char nulls[Natts_pg_trigger];
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Relation rel;
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Relation tgrel;
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HeapScanDesc tgscan;
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ScanKeyData key;
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Relation relrdesc;
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HeapTuple tuple;
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ItemPointerData oldTID;
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Relation idescs[Num_pg_trigger_indices];
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Relation ridescs[Num_pg_class_indices];
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MemoryContext oldcxt;
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Oid fargtypes[8];
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int found = 0;
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int i;
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if (IsSystemRelationName(stmt->relname))
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elog(WARN, "CreateTrigger: can't create trigger for system relation %s", stmt->relname);
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#ifndef NO_SECURITY
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if (!pg_ownercheck(GetPgUserName(), stmt->relname, RELNAME))
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elog(WARN, "%s: %s", stmt->relname, aclcheck_error_strings[ACLCHECK_NOT_OWNER]);
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#endif
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rel = heap_openr(stmt->relname);
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if (!RelationIsValid(rel))
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elog(WARN, "CreateTrigger: there is no relation %s", stmt->relname);
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RelationSetLockForWrite(rel);
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TRIGGER_CLEAR_TYPE(tgtype);
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if (stmt->before)
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TRIGGER_SETT_BEFORE(tgtype);
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if (stmt->row)
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TRIGGER_SETT_ROW(tgtype);
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for (i = 0; i < 3 && stmt->actions[i]; i++)
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{
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switch (stmt->actions[i])
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{
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case 'i':
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if (TRIGGER_FOR_INSERT(tgtype))
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elog(WARN, "CreateTrigger: double INSERT event specified");
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TRIGGER_SETT_INSERT(tgtype);
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break;
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case 'd':
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if (TRIGGER_FOR_DELETE(tgtype))
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elog(WARN, "CreateTrigger: double DELETE event specified");
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TRIGGER_SETT_DELETE(tgtype);
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break;
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case 'u':
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if (TRIGGER_FOR_UPDATE(tgtype))
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elog(WARN, "CreateTrigger: double UPDATE event specified");
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TRIGGER_SETT_UPDATE(tgtype);
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break;
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default:
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elog(WARN, "CreateTrigger: unknown event specified");
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break;
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}
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}
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/* Scan pg_trigger */
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tgrel = heap_openr(TriggerRelationName);
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RelationSetLockForWrite(tgrel);
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ScanKeyEntryInitialize(&key, 0, Anum_pg_trigger_tgrelid,
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ObjectIdEqualRegProcedure, rel->rd_id);
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tgscan = heap_beginscan(tgrel, 0, NowTimeQual, 1, &key);
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while (tuple = heap_getnext(tgscan, 0, (Buffer *) NULL), PointerIsValid(tuple))
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{
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Form_pg_trigger pg_trigger = (Form_pg_trigger) GETSTRUCT(tuple);
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if (namestrcmp(&(pg_trigger->tgname), stmt->trigname) == 0)
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elog(WARN, "CreateTrigger: trigger %s already defined on relation %s",
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stmt->trigname, stmt->relname);
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else
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found++;
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}
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heap_endscan(tgscan);
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memset(fargtypes, 0, 8 * sizeof(Oid));
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tuple = SearchSysCacheTuple(PRONAME,
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PointerGetDatum(stmt->funcname),
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0, PointerGetDatum(fargtypes), 0);
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if (!HeapTupleIsValid(tuple) ||
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((Form_pg_proc) GETSTRUCT(tuple))->prorettype != 0 ||
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((Form_pg_proc) GETSTRUCT(tuple))->pronargs != 0)
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elog(WARN, "CreateTrigger: function %s () does not exist", stmt->funcname);
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if (((Form_pg_proc) GETSTRUCT(tuple))->prolang != ClanguageId)
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elog(WARN, "CreateTrigger: only C functions are supported");
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memset(nulls, ' ', Natts_pg_trigger * sizeof(char));
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values[Anum_pg_trigger_tgrelid - 1] = ObjectIdGetDatum(rel->rd_id);
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values[Anum_pg_trigger_tgname - 1] = NameGetDatum(namein(stmt->trigname));
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values[Anum_pg_trigger_tgfoid - 1] = ObjectIdGetDatum(tuple->t_oid);
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values[Anum_pg_trigger_tgtype - 1] = Int16GetDatum(tgtype);
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if (stmt->args)
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{
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List *le;
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char *args;
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int16 nargs = length(stmt->args);
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int len = 0;
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foreach(le, stmt->args)
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{
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char *ar = (char *) lfirst(le);
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len += strlen(ar) + 4;
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}
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args = (char *) palloc(len + 1);
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args[0] = 0;
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foreach(le, stmt->args)
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sprintf(args + strlen(args), "%s\\000", (char *) lfirst(le));
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values[Anum_pg_trigger_tgnargs - 1] = Int16GetDatum(nargs);
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values[Anum_pg_trigger_tgargs - 1] = PointerGetDatum(byteain(args));
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}
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else
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{
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values[Anum_pg_trigger_tgnargs - 1] = Int16GetDatum(0);
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values[Anum_pg_trigger_tgargs - 1] = PointerGetDatum(byteain(""));
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}
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values[Anum_pg_trigger_tgattr - 1] = PointerGetDatum(tgattr);
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tuple = heap_formtuple(tgrel->rd_att, values, nulls);
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heap_insert(tgrel, tuple);
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CatalogOpenIndices(Num_pg_trigger_indices, Name_pg_trigger_indices, idescs);
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CatalogIndexInsert(idescs, Num_pg_trigger_indices, tgrel, tuple);
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CatalogCloseIndices(Num_pg_trigger_indices, idescs);
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pfree(tuple);
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RelationUnsetLockForWrite(tgrel);
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heap_close(tgrel);
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pfree(DatumGetPointer(values[Anum_pg_trigger_tgname - 1]));
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pfree(DatumGetPointer(values[Anum_pg_trigger_tgargs - 1]));
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/* update pg_class */
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relrdesc = heap_openr(RelationRelationName);
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tuple = ClassNameIndexScan(relrdesc, stmt->relname);
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if (!PointerIsValid(tuple))
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{
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heap_close(relrdesc);
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elog(WARN, "CreateTrigger: relation %s not found in pg_class", stmt->relname);
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}
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((Form_pg_class) GETSTRUCT(tuple))->reltriggers = found + 1;
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RelationInvalidateHeapTuple(relrdesc, tuple);
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oldTID = tuple->t_ctid;
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heap_replace(relrdesc, &oldTID, tuple);
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CatalogOpenIndices(Num_pg_class_indices, Name_pg_class_indices, ridescs);
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CatalogIndexInsert(ridescs, Num_pg_class_indices, relrdesc, tuple);
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CatalogCloseIndices(Num_pg_class_indices, ridescs);
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pfree(tuple);
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heap_close(relrdesc);
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CommandCounterIncrement();
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oldcxt = MemoryContextSwitchTo((MemoryContext) CacheCxt);
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FreeTriggerDesc(rel);
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rel->rd_rel->reltriggers = found + 1;
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RelationBuildTriggers(rel);
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MemoryContextSwitchTo(oldcxt);
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heap_close(rel);
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return;
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}
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void
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DropTrigger(DropTrigStmt * stmt)
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{
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Relation rel;
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Relation tgrel;
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HeapScanDesc tgscan;
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ScanKeyData key;
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Relation relrdesc;
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HeapTuple tuple;
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ItemPointerData oldTID;
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Relation ridescs[Num_pg_class_indices];
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MemoryContext oldcxt;
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int found = 0;
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int tgfound = 0;
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#ifndef NO_SECURITY
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if (!pg_ownercheck(GetPgUserName(), stmt->relname, RELNAME))
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elog(WARN, "%s: %s", stmt->relname, aclcheck_error_strings[ACLCHECK_NOT_OWNER]);
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#endif
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rel = heap_openr(stmt->relname);
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if (!RelationIsValid(rel))
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elog(WARN, "DropTrigger: there is no relation %s", stmt->relname);
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RelationSetLockForWrite(rel);
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tgrel = heap_openr(TriggerRelationName);
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RelationSetLockForWrite(tgrel);
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ScanKeyEntryInitialize(&key, 0, Anum_pg_trigger_tgrelid,
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ObjectIdEqualRegProcedure, rel->rd_id);
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tgscan = heap_beginscan(tgrel, 0, NowTimeQual, 1, &key);
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while (tuple = heap_getnext(tgscan, 0, (Buffer *) NULL), PointerIsValid(tuple))
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{
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Form_pg_trigger pg_trigger = (Form_pg_trigger) GETSTRUCT(tuple);
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if (namestrcmp(&(pg_trigger->tgname), stmt->trigname) == 0)
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{
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heap_delete(tgrel, &tuple->t_ctid);
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tgfound++;
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}
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else
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found++;
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}
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if (tgfound == 0)
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elog(WARN, "DropTrigger: there is no trigger %s on relation %s",
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stmt->trigname, stmt->relname);
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if (tgfound > 1)
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elog(NOTICE, "DropTrigger: found (and deleted) %d trigger %s on relation %s",
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tgfound, stmt->trigname, stmt->relname);
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heap_endscan(tgscan);
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RelationUnsetLockForWrite(tgrel);
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heap_close(tgrel);
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/* update pg_class */
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relrdesc = heap_openr(RelationRelationName);
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tuple = ClassNameIndexScan(relrdesc, stmt->relname);
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if (!PointerIsValid(tuple))
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{
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heap_close(relrdesc);
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elog(WARN, "DropTrigger: relation %s not found in pg_class", stmt->relname);
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}
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((Form_pg_class) GETSTRUCT(tuple))->reltriggers = found;
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RelationInvalidateHeapTuple(relrdesc, tuple);
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oldTID = tuple->t_ctid;
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heap_replace(relrdesc, &oldTID, tuple);
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CatalogOpenIndices(Num_pg_class_indices, Name_pg_class_indices, ridescs);
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CatalogIndexInsert(ridescs, Num_pg_class_indices, relrdesc, tuple);
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CatalogCloseIndices(Num_pg_class_indices, ridescs);
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pfree(tuple);
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heap_close(relrdesc);
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CommandCounterIncrement();
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oldcxt = MemoryContextSwitchTo((MemoryContext) CacheCxt);
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FreeTriggerDesc(rel);
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rel->rd_rel->reltriggers = found;
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if (found > 0)
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RelationBuildTriggers(rel);
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MemoryContextSwitchTo(oldcxt);
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heap_close(rel);
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return;
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}
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void
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RelationRemoveTriggers(Relation rel)
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{
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Relation tgrel;
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HeapScanDesc tgscan;
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ScanKeyData key;
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HeapTuple tup;
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tgrel = heap_openr(TriggerRelationName);
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RelationSetLockForWrite(tgrel);
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ScanKeyEntryInitialize(&key, 0, Anum_pg_trigger_tgrelid,
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ObjectIdEqualRegProcedure, rel->rd_id);
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tgscan = heap_beginscan(tgrel, 0, NowTimeQual, 1, &key);
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while (tup = heap_getnext(tgscan, 0, (Buffer *) NULL), PointerIsValid(tup))
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heap_delete(tgrel, &tup->t_ctid);
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heap_endscan(tgscan);
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RelationUnsetLockForWrite(tgrel);
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heap_close(tgrel);
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}
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void
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RelationBuildTriggers(Relation relation)
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{
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TriggerDesc *trigdesc = (TriggerDesc *) palloc(sizeof(TriggerDesc));
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int ntrigs = relation->rd_rel->reltriggers;
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Trigger *triggers = NULL;
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Trigger *build;
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Relation tgrel;
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Form_pg_trigger pg_trigger;
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Relation irel;
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ScanKeyData skey;
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HeapTuple tuple;
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IndexScanDesc sd;
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RetrieveIndexResult indexRes;
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Buffer buffer;
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ItemPointer iptr;
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struct varlena *val;
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bool isnull;
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int found;
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memset(trigdesc, 0, sizeof(TriggerDesc));
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ScanKeyEntryInitialize(&skey,
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(bits16) 0x0,
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(AttrNumber) 1,
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(RegProcedure) ObjectIdEqualRegProcedure,
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ObjectIdGetDatum(relation->rd_id));
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tgrel = heap_openr(TriggerRelationName);
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RelationSetLockForRead(tgrel);
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irel = index_openr(TriggerRelidIndex);
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sd = index_beginscan(irel, false, 1, &skey);
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for (found = 0;;)
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{
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indexRes = index_getnext(sd, ForwardScanDirection);
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if (!indexRes)
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break;
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iptr = &indexRes->heap_iptr;
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tuple = heap_fetch(tgrel, NowTimeQual, iptr, &buffer);
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pfree(indexRes);
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if (!HeapTupleIsValid(tuple))
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continue;
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if (found == ntrigs)
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elog(WARN, "RelationBuildTriggers: unexpected record found for rel %.*s",
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NAMEDATALEN, relation->rd_rel->relname.data);
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pg_trigger = (Form_pg_trigger) GETSTRUCT(tuple);
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if (triggers == NULL)
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triggers = (Trigger *) palloc(sizeof(Trigger));
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else
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triggers = (Trigger *) repalloc(triggers, (found + 1) * sizeof(Trigger));
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build = &(triggers[found]);
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build->tgname = nameout(&(pg_trigger->tgname));
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build->tgfoid = pg_trigger->tgfoid;
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build->tgfunc = NULL;
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build->tgtype = pg_trigger->tgtype;
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build->tgnargs = pg_trigger->tgnargs;
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memcpy(build->tgattr, &(pg_trigger->tgattr), 8 * sizeof(int16));
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val = (struct varlena *) fastgetattr(tuple,
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Anum_pg_trigger_tgargs,
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tgrel->rd_att, &isnull);
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if (isnull)
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elog(WARN, "RelationBuildTriggers: tgargs IS NULL for rel %.*s",
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NAMEDATALEN, relation->rd_rel->relname.data);
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if (build->tgnargs > 0)
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{
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char *p;
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int i;
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val = (struct varlena *) fastgetattr(tuple,
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Anum_pg_trigger_tgargs,
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tgrel->rd_att, &isnull);
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if (isnull)
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elog(WARN, "RelationBuildTriggers: tgargs IS NULL for rel %.*s",
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NAMEDATALEN, relation->rd_rel->relname.data);
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p = (char *) VARDATA(val);
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build->tgargs = (char **) palloc(build->tgnargs * sizeof(char *));
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for (i = 0; i < build->tgnargs; i++)
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{
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build->tgargs[i] = (char *) palloc(strlen(p) + 1);
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strcpy(build->tgargs[i], p);
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p += strlen(p) + 1;
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}
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}
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else
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build->tgargs = NULL;
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found++;
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ReleaseBuffer(buffer);
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}
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if (found < ntrigs)
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elog(WARN, "RelationBuildTriggers: %d record not found for rel %.*s",
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ntrigs - found,
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NAMEDATALEN, relation->rd_rel->relname.data);
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index_endscan(sd);
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pfree(sd);
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index_close(irel);
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RelationUnsetLockForRead(tgrel);
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heap_close(tgrel);
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/* Build trigdesc */
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trigdesc->triggers = triggers;
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for (found = 0; found < ntrigs; found++)
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{
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build = &(triggers[found]);
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DescribeTrigger(trigdesc, build);
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}
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relation->trigdesc = trigdesc;
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}
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void
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FreeTriggerDesc(Relation relation)
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{
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TriggerDesc *trigdesc = relation->trigdesc;
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Trigger ***t;
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Trigger *trigger;
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int i;
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if (trigdesc == NULL)
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return;
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t = trigdesc->tg_before_statement;
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for (i = 0; i < 3; i++)
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if (t[i] != NULL)
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pfree(t[i]);
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t = trigdesc->tg_before_row;
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for (i = 0; i < 3; i++)
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if (t[i] != NULL)
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pfree(t[i]);
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t = trigdesc->tg_after_row;
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for (i = 0; i < 3; i++)
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if (t[i] != NULL)
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pfree(t[i]);
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t = trigdesc->tg_after_statement;
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for (i = 0; i < 3; i++)
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if (t[i] != NULL)
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pfree(t[i]);
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trigger = trigdesc->triggers;
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for (i = 0; i < relation->rd_rel->reltriggers; i++)
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{
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pfree(trigger->tgname);
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if (trigger->tgnargs > 0)
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{
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while (--(trigger->tgnargs) >= 0)
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pfree(trigger->tgargs[trigger->tgnargs]);
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pfree(trigger->tgargs);
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}
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trigger++;
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}
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pfree(trigdesc->triggers);
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pfree(trigdesc);
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relation->trigdesc = NULL;
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return;
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}
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static void
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DescribeTrigger(TriggerDesc * trigdesc, Trigger * trigger)
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{
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uint16 *n;
|
|
Trigger ***t,
|
|
***tp;
|
|
|
|
if (TRIGGER_FOR_ROW(trigger->tgtype)) /* Is ROW/STATEMENT
|
|
* trigger */
|
|
{
|
|
if (TRIGGER_FOR_BEFORE(trigger->tgtype))
|
|
{
|
|
n = trigdesc->n_before_row;
|
|
t = trigdesc->tg_before_row;
|
|
}
|
|
else
|
|
{
|
|
n = trigdesc->n_after_row;
|
|
t = trigdesc->tg_after_row;
|
|
}
|
|
}
|
|
else
|
|
/* STATEMENT (NI) */
|
|
{
|
|
if (TRIGGER_FOR_BEFORE(trigger->tgtype))
|
|
{
|
|
n = trigdesc->n_before_statement;
|
|
t = trigdesc->tg_before_statement;
|
|
}
|
|
else
|
|
{
|
|
n = trigdesc->n_after_statement;
|
|
t = trigdesc->tg_after_statement;
|
|
}
|
|
}
|
|
|
|
if (TRIGGER_FOR_INSERT(trigger->tgtype))
|
|
{
|
|
tp = &(t[TRIGGER_EVENT_INSERT]);
|
|
if (*tp == NULL)
|
|
*tp = (Trigger **) palloc(sizeof(Trigger *));
|
|
else
|
|
*tp = (Trigger **) repalloc(*tp, (n[TRIGGER_EVENT_INSERT] + 1) *
|
|
sizeof(Trigger *));
|
|
(*tp)[n[TRIGGER_EVENT_INSERT]] = trigger;
|
|
(n[TRIGGER_EVENT_INSERT])++;
|
|
}
|
|
|
|
if (TRIGGER_FOR_DELETE(trigger->tgtype))
|
|
{
|
|
tp = &(t[TRIGGER_EVENT_DELETE]);
|
|
if (*tp == NULL)
|
|
*tp = (Trigger **) palloc(sizeof(Trigger *));
|
|
else
|
|
*tp = (Trigger **) repalloc(*tp, (n[TRIGGER_EVENT_DELETE] + 1) *
|
|
sizeof(Trigger *));
|
|
(*tp)[n[TRIGGER_EVENT_DELETE]] = trigger;
|
|
(n[TRIGGER_EVENT_DELETE])++;
|
|
}
|
|
|
|
if (TRIGGER_FOR_UPDATE(trigger->tgtype))
|
|
{
|
|
tp = &(t[TRIGGER_EVENT_UPDATE]);
|
|
if (*tp == NULL)
|
|
*tp = (Trigger **) palloc(sizeof(Trigger *));
|
|
else
|
|
*tp = (Trigger **) repalloc(*tp, (n[TRIGGER_EVENT_UPDATE] + 1) *
|
|
sizeof(Trigger *));
|
|
(*tp)[n[TRIGGER_EVENT_UPDATE]] = trigger;
|
|
(n[TRIGGER_EVENT_UPDATE])++;
|
|
}
|
|
|
|
}
|
|
|
|
HeapTuple
|
|
ExecBRInsertTriggers(Relation rel, HeapTuple trigtuple)
|
|
{
|
|
TriggerData *SaveTriggerData;
|
|
int ntrigs = rel->trigdesc->n_before_row[TRIGGER_EVENT_INSERT];
|
|
Trigger **trigger = rel->trigdesc->tg_before_row[TRIGGER_EVENT_INSERT];
|
|
HeapTuple newtuple = trigtuple;
|
|
HeapTuple oldtuple;
|
|
int nargs;
|
|
int i;
|
|
|
|
SaveTriggerData = (TriggerData *) palloc(sizeof(TriggerData));
|
|
SaveTriggerData->tg_event =
|
|
TRIGGER_EVENT_INSERT | TRIGGER_EVENT_ROW | TRIGGER_EVENT_BEFORE;
|
|
SaveTriggerData->tg_relation = rel;
|
|
SaveTriggerData->tg_newtuple = NULL;
|
|
for (i = 0; i < ntrigs; i++)
|
|
{
|
|
CurrentTriggerData = SaveTriggerData;
|
|
CurrentTriggerData->tg_trigtuple = oldtuple = newtuple;
|
|
CurrentTriggerData->tg_trigger = trigger[i];
|
|
if (trigger[i]->tgfunc == NULL)
|
|
fmgr_info(trigger[i]->tgfoid, &(trigger[i]->tgfunc), &nargs);
|
|
newtuple = (HeapTuple) ((*(trigger[i]->tgfunc)) ());
|
|
if (newtuple == NULL)
|
|
break;
|
|
else if (oldtuple != newtuple && oldtuple != trigtuple)
|
|
pfree(oldtuple);
|
|
}
|
|
CurrentTriggerData = NULL;
|
|
pfree(SaveTriggerData);
|
|
return (newtuple);
|
|
}
|
|
|
|
void
|
|
ExecARInsertTriggers(Relation rel, HeapTuple trigtuple)
|
|
{
|
|
TriggerData *SaveTriggerData;
|
|
int ntrigs = rel->trigdesc->n_after_row[TRIGGER_EVENT_INSERT];
|
|
Trigger **trigger = rel->trigdesc->tg_after_row[TRIGGER_EVENT_INSERT];
|
|
int nargs;
|
|
int i;
|
|
|
|
SaveTriggerData = (TriggerData *) palloc(sizeof(TriggerData));
|
|
SaveTriggerData->tg_event = TRIGGER_EVENT_INSERT | TRIGGER_EVENT_ROW;
|
|
SaveTriggerData->tg_relation = rel;
|
|
SaveTriggerData->tg_newtuple = NULL;
|
|
for (i = 0; i < ntrigs; i++)
|
|
{
|
|
CurrentTriggerData = SaveTriggerData;
|
|
CurrentTriggerData->tg_trigtuple = trigtuple;
|
|
CurrentTriggerData->tg_trigger = trigger[i];
|
|
if (trigger[i]->tgfunc == NULL)
|
|
fmgr_info(trigger[i]->tgfoid, &(trigger[i]->tgfunc), &nargs);
|
|
(void) ((*(trigger[i]->tgfunc)) ());
|
|
}
|
|
CurrentTriggerData = NULL;
|
|
pfree(SaveTriggerData);
|
|
return;
|
|
}
|
|
|
|
bool
|
|
ExecBRDeleteTriggers(Relation rel, ItemPointer tupleid)
|
|
{
|
|
TriggerData *SaveTriggerData;
|
|
int ntrigs = rel->trigdesc->n_before_row[TRIGGER_EVENT_DELETE];
|
|
Trigger **trigger = rel->trigdesc->tg_before_row[TRIGGER_EVENT_DELETE];
|
|
HeapTuple trigtuple;
|
|
HeapTuple newtuple = NULL;
|
|
int nargs;
|
|
int i;
|
|
|
|
trigtuple = GetTupleForTrigger(rel, tupleid, true);
|
|
if (trigtuple == NULL)
|
|
return (false);
|
|
|
|
SaveTriggerData = (TriggerData *) palloc(sizeof(TriggerData));
|
|
SaveTriggerData->tg_event =
|
|
TRIGGER_EVENT_DELETE | TRIGGER_EVENT_ROW | TRIGGER_EVENT_BEFORE;
|
|
SaveTriggerData->tg_relation = rel;
|
|
SaveTriggerData->tg_newtuple = NULL;
|
|
for (i = 0; i < ntrigs; i++)
|
|
{
|
|
CurrentTriggerData = SaveTriggerData;
|
|
CurrentTriggerData->tg_trigtuple = trigtuple;
|
|
CurrentTriggerData->tg_trigger = trigger[i];
|
|
if (trigger[i]->tgfunc == NULL)
|
|
fmgr_info(trigger[i]->tgfoid, &(trigger[i]->tgfunc), &nargs);
|
|
newtuple = (HeapTuple) ((*(trigger[i]->tgfunc)) ());
|
|
if (newtuple == NULL)
|
|
break;
|
|
}
|
|
CurrentTriggerData = NULL;
|
|
pfree(SaveTriggerData);
|
|
pfree(trigtuple);
|
|
|
|
return ((newtuple == NULL) ? false : true);
|
|
}
|
|
|
|
void
|
|
ExecARDeleteTriggers(Relation rel, ItemPointer tupleid)
|
|
{
|
|
TriggerData *SaveTriggerData;
|
|
int ntrigs = rel->trigdesc->n_after_row[TRIGGER_EVENT_DELETE];
|
|
Trigger **trigger = rel->trigdesc->tg_after_row[TRIGGER_EVENT_DELETE];
|
|
HeapTuple trigtuple;
|
|
int nargs;
|
|
int i;
|
|
|
|
trigtuple = GetTupleForTrigger(rel, tupleid, false);
|
|
Assert(trigtuple != NULL);
|
|
|
|
SaveTriggerData = (TriggerData *) palloc(sizeof(TriggerData));
|
|
SaveTriggerData->tg_event =
|
|
TRIGGER_EVENT_DELETE | TRIGGER_EVENT_ROW;
|
|
SaveTriggerData->tg_relation = rel;
|
|
SaveTriggerData->tg_newtuple = NULL;
|
|
for (i = 0; i < ntrigs; i++)
|
|
{
|
|
CurrentTriggerData = SaveTriggerData;
|
|
CurrentTriggerData->tg_trigtuple = trigtuple;
|
|
CurrentTriggerData->tg_trigger = trigger[i];
|
|
if (trigger[i]->tgfunc == NULL)
|
|
fmgr_info(trigger[i]->tgfoid, &(trigger[i]->tgfunc), &nargs);
|
|
(void) ((*(trigger[i]->tgfunc)) ());
|
|
}
|
|
CurrentTriggerData = NULL;
|
|
pfree(SaveTriggerData);
|
|
pfree(trigtuple);
|
|
return;
|
|
}
|
|
|
|
HeapTuple
|
|
ExecBRUpdateTriggers(Relation rel, ItemPointer tupleid, HeapTuple newtuple)
|
|
{
|
|
TriggerData *SaveTriggerData;
|
|
int ntrigs = rel->trigdesc->n_before_row[TRIGGER_EVENT_UPDATE];
|
|
Trigger **trigger = rel->trigdesc->tg_before_row[TRIGGER_EVENT_UPDATE];
|
|
HeapTuple trigtuple;
|
|
HeapTuple oldtuple;
|
|
HeapTuple intuple = newtuple;
|
|
int nargs;
|
|
int i;
|
|
|
|
trigtuple = GetTupleForTrigger(rel, tupleid, true);
|
|
if (trigtuple == NULL)
|
|
return (NULL);
|
|
|
|
SaveTriggerData = (TriggerData *) palloc(sizeof(TriggerData));
|
|
SaveTriggerData->tg_event =
|
|
TRIGGER_EVENT_UPDATE | TRIGGER_EVENT_ROW | TRIGGER_EVENT_BEFORE;
|
|
SaveTriggerData->tg_relation = rel;
|
|
for (i = 0; i < ntrigs; i++)
|
|
{
|
|
CurrentTriggerData = SaveTriggerData;
|
|
CurrentTriggerData->tg_trigtuple = trigtuple;
|
|
CurrentTriggerData->tg_newtuple = oldtuple = newtuple;
|
|
CurrentTriggerData->tg_trigger = trigger[i];
|
|
if (trigger[i]->tgfunc == NULL)
|
|
fmgr_info(trigger[i]->tgfoid, &(trigger[i]->tgfunc), &nargs);
|
|
newtuple = (HeapTuple) ((*(trigger[i]->tgfunc)) ());
|
|
if (newtuple == NULL)
|
|
break;
|
|
else if (oldtuple != newtuple && oldtuple != intuple)
|
|
pfree(oldtuple);
|
|
}
|
|
CurrentTriggerData = NULL;
|
|
pfree(SaveTriggerData);
|
|
pfree(trigtuple);
|
|
return (newtuple);
|
|
}
|
|
|
|
void
|
|
ExecARUpdateTriggers(Relation rel, ItemPointer tupleid, HeapTuple newtuple)
|
|
{
|
|
TriggerData *SaveTriggerData;
|
|
int ntrigs = rel->trigdesc->n_after_row[TRIGGER_EVENT_UPDATE];
|
|
Trigger **trigger = rel->trigdesc->tg_after_row[TRIGGER_EVENT_UPDATE];
|
|
HeapTuple trigtuple;
|
|
int nargs;
|
|
int i;
|
|
|
|
trigtuple = GetTupleForTrigger(rel, tupleid, false);
|
|
Assert(trigtuple != NULL);
|
|
|
|
SaveTriggerData = (TriggerData *) palloc(sizeof(TriggerData));
|
|
SaveTriggerData->tg_event =
|
|
TRIGGER_EVENT_UPDATE | TRIGGER_EVENT_ROW;
|
|
SaveTriggerData->tg_relation = rel;
|
|
for (i = 0; i < ntrigs; i++)
|
|
{
|
|
CurrentTriggerData = SaveTriggerData;
|
|
CurrentTriggerData->tg_trigtuple = trigtuple;
|
|
CurrentTriggerData->tg_newtuple = newtuple;
|
|
CurrentTriggerData->tg_trigger = trigger[i];
|
|
if (trigger[i]->tgfunc == NULL)
|
|
fmgr_info(trigger[i]->tgfoid, &(trigger[i]->tgfunc), &nargs);
|
|
(void) ((*(trigger[i]->tgfunc)) ());
|
|
}
|
|
CurrentTriggerData = NULL;
|
|
pfree(SaveTriggerData);
|
|
pfree(trigtuple);
|
|
return;
|
|
}
|
|
|
|
static HeapTuple
|
|
GetTupleForTrigger(Relation relation, ItemPointer tid, bool before)
|
|
{
|
|
ItemId lp;
|
|
HeapTuple tuple;
|
|
PageHeader dp;
|
|
Buffer b;
|
|
|
|
b = ReadBuffer(relation, ItemPointerGetBlockNumber(tid));
|
|
|
|
if (!BufferIsValid(b))
|
|
elog(WARN, "GetTupleForTrigger: failed ReadBuffer");
|
|
|
|
dp = (PageHeader) BufferGetPage(b);
|
|
lp = PageGetItemId(dp, ItemPointerGetOffsetNumber(tid));
|
|
|
|
Assert(ItemIdIsUsed(lp));
|
|
|
|
tuple = (HeapTuple) PageGetItem((Page) dp, lp);
|
|
|
|
if (before)
|
|
{
|
|
if (TupleUpdatedByCurXactAndCmd(tuple))
|
|
{
|
|
elog(NOTICE, "GetTupleForTrigger: Non-functional delete/update");
|
|
ReleaseBuffer(b);
|
|
return (NULL);
|
|
}
|
|
|
|
HeapTupleSatisfies(lp, relation, b, dp,
|
|
NowTimeQual, 0, (ScanKey) NULL, tuple);
|
|
if (!tuple)
|
|
{
|
|
ReleaseBuffer(b);
|
|
elog(WARN, "GetTupleForTrigger: (am)invalid tid");
|
|
}
|
|
}
|
|
|
|
tuple = heap_copytuple(tuple);
|
|
ReleaseBuffer(b);
|
|
|
|
return (tuple);
|
|
}
|