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This is infrastructure for the complete SQL standard feature. No support is included at this point for execution nodes or PLs. The intent is to add that soon. As this patch leaves things, standard syntax can create tuplestores to contain old and/or new versions of rows affected by a statement. References to these tuplestores are in the TriggerData structure. C triggers can access the tuplestores directly, so they are usable, but they cannot yet be referenced within a SQL statement.
218 lines
6.9 KiB
C
218 lines
6.9 KiB
C
/*-------------------------------------------------------------------------
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*
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* trigger.h
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* Declarations for trigger handling.
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*
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* Portions Copyright (c) 1996-2016, 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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* src/include/commands/trigger.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef TRIGGER_H
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#define TRIGGER_H
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#include "catalog/objectaddress.h"
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#include "nodes/execnodes.h"
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#include "nodes/parsenodes.h"
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/*
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* TriggerData is the node type that is passed as fmgr "context" info
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* when a function is called by the trigger manager.
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*/
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#define CALLED_AS_TRIGGER(fcinfo) \
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((fcinfo)->context != NULL && IsA((fcinfo)->context, TriggerData))
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typedef uint32 TriggerEvent;
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typedef struct TriggerData
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{
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NodeTag type;
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TriggerEvent tg_event;
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Relation tg_relation;
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HeapTuple tg_trigtuple;
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HeapTuple tg_newtuple;
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Trigger *tg_trigger;
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Buffer tg_trigtuplebuf;
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Buffer tg_newtuplebuf;
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Tuplestorestate *tg_oldtable;
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Tuplestorestate *tg_newtable;
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} TriggerData;
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/*
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* TriggerEvent bit flags
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*
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* Note that we assume different event types (INSERT/DELETE/UPDATE/TRUNCATE)
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* can't be OR'd together in a single TriggerEvent. This is unlike the
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* situation for pg_trigger rows, so pg_trigger.tgtype uses a different
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* representation!
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*/
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#define TRIGGER_EVENT_INSERT 0x00000000
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#define TRIGGER_EVENT_DELETE 0x00000001
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#define TRIGGER_EVENT_UPDATE 0x00000002
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#define TRIGGER_EVENT_TRUNCATE 0x00000003
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#define TRIGGER_EVENT_OPMASK 0x00000003
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#define TRIGGER_EVENT_ROW 0x00000004
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#define TRIGGER_EVENT_BEFORE 0x00000008
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#define TRIGGER_EVENT_AFTER 0x00000000
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#define TRIGGER_EVENT_INSTEAD 0x00000010
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#define TRIGGER_EVENT_TIMINGMASK 0x00000018
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/* More TriggerEvent flags, used only within trigger.c */
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#define AFTER_TRIGGER_DEFERRABLE 0x00000020
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#define AFTER_TRIGGER_INITDEFERRED 0x00000040
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#define TRIGGER_FIRED_BY_INSERT(event) \
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(((event) & TRIGGER_EVENT_OPMASK) == TRIGGER_EVENT_INSERT)
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#define TRIGGER_FIRED_BY_DELETE(event) \
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(((event) & TRIGGER_EVENT_OPMASK) == TRIGGER_EVENT_DELETE)
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#define TRIGGER_FIRED_BY_UPDATE(event) \
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(((event) & TRIGGER_EVENT_OPMASK) == TRIGGER_EVENT_UPDATE)
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#define TRIGGER_FIRED_BY_TRUNCATE(event) \
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(((event) & TRIGGER_EVENT_OPMASK) == TRIGGER_EVENT_TRUNCATE)
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#define TRIGGER_FIRED_FOR_ROW(event) \
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((event) & TRIGGER_EVENT_ROW)
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#define TRIGGER_FIRED_FOR_STATEMENT(event) \
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(!TRIGGER_FIRED_FOR_ROW(event))
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#define TRIGGER_FIRED_BEFORE(event) \
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(((event) & TRIGGER_EVENT_TIMINGMASK) == TRIGGER_EVENT_BEFORE)
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#define TRIGGER_FIRED_AFTER(event) \
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(((event) & TRIGGER_EVENT_TIMINGMASK) == TRIGGER_EVENT_AFTER)
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#define TRIGGER_FIRED_INSTEAD(event) \
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(((event) & TRIGGER_EVENT_TIMINGMASK) == TRIGGER_EVENT_INSTEAD)
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/*
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* Definitions for replication role based firing.
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*/
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#define SESSION_REPLICATION_ROLE_ORIGIN 0
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#define SESSION_REPLICATION_ROLE_REPLICA 1
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#define SESSION_REPLICATION_ROLE_LOCAL 2
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extern PGDLLIMPORT int SessionReplicationRole;
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/*
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* States at which a trigger can be fired. These are the
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* possible values for pg_trigger.tgenabled.
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*/
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#define TRIGGER_FIRES_ON_ORIGIN 'O'
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#define TRIGGER_FIRES_ALWAYS 'A'
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#define TRIGGER_FIRES_ON_REPLICA 'R'
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#define TRIGGER_DISABLED 'D'
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extern ObjectAddress CreateTrigger(CreateTrigStmt *stmt, const char *queryString,
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Oid relOid, Oid refRelOid, Oid constraintOid, Oid indexOid,
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bool isInternal);
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extern void RemoveTriggerById(Oid trigOid);
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extern Oid get_trigger_oid(Oid relid, const char *name, bool missing_ok);
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extern ObjectAddress renametrig(RenameStmt *stmt);
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extern void EnableDisableTrigger(Relation rel, const char *tgname,
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char fires_when, bool skip_system);
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extern void RelationBuildTriggers(Relation relation);
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extern TriggerDesc *CopyTriggerDesc(TriggerDesc *trigdesc);
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extern void FreeTriggerDesc(TriggerDesc *trigdesc);
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extern void ExecBSInsertTriggers(EState *estate,
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ResultRelInfo *relinfo);
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extern void ExecASInsertTriggers(EState *estate,
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ResultRelInfo *relinfo);
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extern TupleTableSlot *ExecBRInsertTriggers(EState *estate,
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ResultRelInfo *relinfo,
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TupleTableSlot *slot);
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extern void ExecARInsertTriggers(EState *estate,
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ResultRelInfo *relinfo,
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HeapTuple trigtuple,
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List *recheckIndexes);
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extern TupleTableSlot *ExecIRInsertTriggers(EState *estate,
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ResultRelInfo *relinfo,
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TupleTableSlot *slot);
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extern void ExecBSDeleteTriggers(EState *estate,
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ResultRelInfo *relinfo);
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extern void ExecASDeleteTriggers(EState *estate,
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ResultRelInfo *relinfo);
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extern bool ExecBRDeleteTriggers(EState *estate,
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EPQState *epqstate,
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ResultRelInfo *relinfo,
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ItemPointer tupleid,
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HeapTuple fdw_trigtuple);
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extern void ExecARDeleteTriggers(EState *estate,
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ResultRelInfo *relinfo,
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ItemPointer tupleid,
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HeapTuple fdw_trigtuple);
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extern bool ExecIRDeleteTriggers(EState *estate,
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ResultRelInfo *relinfo,
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HeapTuple trigtuple);
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extern void ExecBSUpdateTriggers(EState *estate,
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ResultRelInfo *relinfo);
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extern void ExecASUpdateTriggers(EState *estate,
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ResultRelInfo *relinfo);
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extern TupleTableSlot *ExecBRUpdateTriggers(EState *estate,
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EPQState *epqstate,
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ResultRelInfo *relinfo,
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ItemPointer tupleid,
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HeapTuple fdw_trigtuple,
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TupleTableSlot *slot);
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extern void ExecARUpdateTriggers(EState *estate,
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ResultRelInfo *relinfo,
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ItemPointer tupleid,
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HeapTuple fdw_trigtuple,
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HeapTuple newtuple,
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List *recheckIndexes);
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extern TupleTableSlot *ExecIRUpdateTriggers(EState *estate,
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ResultRelInfo *relinfo,
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HeapTuple trigtuple,
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TupleTableSlot *slot);
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extern void ExecBSTruncateTriggers(EState *estate,
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ResultRelInfo *relinfo);
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extern void ExecASTruncateTriggers(EState *estate,
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ResultRelInfo *relinfo);
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extern void AfterTriggerBeginXact(void);
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extern void AfterTriggerBeginQuery(void);
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extern void AfterTriggerEndQuery(EState *estate);
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extern void AfterTriggerFireDeferred(void);
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extern void AfterTriggerEndXact(bool isCommit);
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extern void AfterTriggerBeginSubXact(void);
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extern void AfterTriggerEndSubXact(bool isCommit);
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extern void AfterTriggerSetState(ConstraintsSetStmt *stmt);
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extern bool AfterTriggerPendingOnRel(Oid relid);
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/*
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* in utils/adt/ri_triggers.c
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*/
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extern bool RI_FKey_pk_upd_check_required(Trigger *trigger, Relation pk_rel,
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HeapTuple old_row, HeapTuple new_row);
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extern bool RI_FKey_fk_upd_check_required(Trigger *trigger, Relation fk_rel,
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HeapTuple old_row, HeapTuple new_row);
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extern bool RI_Initial_Check(Trigger *trigger,
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Relation fk_rel, Relation pk_rel);
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/* result values for RI_FKey_trigger_type: */
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#define RI_TRIGGER_PK 1 /* is a trigger on the PK relation */
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#define RI_TRIGGER_FK 2 /* is a trigger on the FK relation */
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#define RI_TRIGGER_NONE 0 /* is not an RI trigger function */
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extern int RI_FKey_trigger_type(Oid tgfoid);
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extern Datum pg_trigger_depth(PG_FUNCTION_ARGS);
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#endif /* TRIGGER_H */
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