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/*-------------------------------------------------------------------------
*
* trigger.h
* Declarations for trigger handling.
*
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/commands/trigger.h,v 1.56 2005/10/15 02:49:44 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef TRIGGER_H
#define TRIGGER_H
#include "nodes/execnodes.h"
#include "nodes/parsenodes.h"
/*
* TriggerData is the node type that is passed as fmgr "context" info
* when a function is called by the trigger manager.
*/
#define CALLED_AS_TRIGGER(fcinfo) \
((fcinfo)->context != NULL && IsA((fcinfo)->context, TriggerData))
typedef uint32 TriggerEvent;
typedef struct TriggerData
{
NodeTag type;
TriggerEvent tg_event;
Relation tg_relation;
HeapTuple tg_trigtuple;
HeapTuple tg_newtuple;
Trigger *tg_trigger;
Buffer tg_trigtuplebuf;
Buffer tg_newtuplebuf;
} TriggerData;
/* TriggerEvent bit flags */
#define TRIGGER_EVENT_INSERT 0x00000000
#define TRIGGER_EVENT_DELETE 0x00000001
#define TRIGGER_EVENT_UPDATE 0x00000002
#define TRIGGER_EVENT_OPMASK 0x00000003
#define TRIGGER_EVENT_ROW 0x00000004
#define TRIGGER_EVENT_BEFORE 0x00000008
/* More TriggerEvent flags, used only within trigger.c */
#define AFTER_TRIGGER_DONE 0x00000010
#define AFTER_TRIGGER_IN_PROGRESS 0x00000020
#define AFTER_TRIGGER_DEFERRABLE 0x00000040
#define AFTER_TRIGGER_INITDEFERRED 0x00000080
#define TRIGGER_FIRED_BY_INSERT(event) \
(((TriggerEvent) (event) & TRIGGER_EVENT_OPMASK) == \
TRIGGER_EVENT_INSERT)
#define TRIGGER_FIRED_BY_DELETE(event) \
(((TriggerEvent) (event) & TRIGGER_EVENT_OPMASK) == \
TRIGGER_EVENT_DELETE)
#define TRIGGER_FIRED_BY_UPDATE(event) \
(((TriggerEvent) (event) & TRIGGER_EVENT_OPMASK) == \
TRIGGER_EVENT_UPDATE)
#define TRIGGER_FIRED_FOR_ROW(event) \
((TriggerEvent) (event) & TRIGGER_EVENT_ROW)
#define TRIGGER_FIRED_FOR_STATEMENT(event) \
(!TRIGGER_FIRED_FOR_ROW (event))
#define TRIGGER_FIRED_BEFORE(event) \
((TriggerEvent) (event) & TRIGGER_EVENT_BEFORE)
#define TRIGGER_FIRED_AFTER(event) \
(!TRIGGER_FIRED_BEFORE (event))
/*
* RI trigger function arguments are stored in pg_trigger.tgargs bytea
*
* constrname\0fkrel\0pkrel\0matchtype\0fkatt\0pkatt\0fkatt\0pkatt\0...
*
* There are one or more pairs of fkatt/pkatt names.
*
* The relation names are no longer of much use since they are not
* guaranteed unique; they are present only for backwards compatibility.
* Use the tgrelid and tgconstrrelid fields to identify the referenced
* relations, instead. (But note that which is which will depend on which
* trigger you are looking at!)
*/
#define RI_CONSTRAINT_NAME_ARGNO 0
#define RI_FK_RELNAME_ARGNO 1
#define RI_PK_RELNAME_ARGNO 2
#define RI_MATCH_TYPE_ARGNO 3
#define RI_FIRST_ATTNAME_ARGNO 4 /* first attname pair starts
* here */
#define RI_KEYPAIR_FK_IDX 0
#define RI_KEYPAIR_PK_IDX 1
#define RI_MAX_NUMKEYS INDEX_MAX_KEYS
#define RI_MAX_ARGUMENTS (RI_FIRST_ATTNAME_ARGNO + (RI_MAX_NUMKEYS * 2))
extern Oid CreateTrigger(CreateTrigStmt *stmt, bool forConstraint);
extern void DropTrigger(Oid relid, const char *trigname,
DropBehavior behavior);
extern void RemoveTriggerById(Oid trigOid);
extern void renametrig(Oid relid, const char *oldname, const char *newname);
extern void EnableDisableTrigger(Relation rel, const char *tgname,
bool enable, bool skip_system);
extern void RelationBuildTriggers(Relation relation);
extern TriggerDesc *CopyTriggerDesc(TriggerDesc *trigdesc);
extern void FreeTriggerDesc(TriggerDesc *trigdesc);
extern void ExecBSInsertTriggers(EState *estate,
ResultRelInfo *relinfo);
extern void ExecASInsertTriggers(EState *estate,
ResultRelInfo *relinfo);
extern HeapTuple ExecBRInsertTriggers(EState *estate,
ResultRelInfo *relinfo,
HeapTuple trigtuple);
extern void ExecARInsertTriggers(EState *estate,
ResultRelInfo *relinfo,
HeapTuple trigtuple);
extern void ExecBSDeleteTriggers(EState *estate,
ResultRelInfo *relinfo);
extern void ExecASDeleteTriggers(EState *estate,
ResultRelInfo *relinfo);
extern bool ExecBRDeleteTriggers(EState *estate,
ResultRelInfo *relinfo,
ItemPointer tupleid,
CommandId cid);
extern void ExecARDeleteTriggers(EState *estate,
ResultRelInfo *relinfo,
ItemPointer tupleid);
extern void ExecBSUpdateTriggers(EState *estate,
ResultRelInfo *relinfo);
extern void ExecASUpdateTriggers(EState *estate,
ResultRelInfo *relinfo);
extern HeapTuple ExecBRUpdateTriggers(EState *estate,
ResultRelInfo *relinfo,
ItemPointer tupleid,
HeapTuple newtuple,
CommandId cid);
extern void ExecARUpdateTriggers(EState *estate,
ResultRelInfo *relinfo,
ItemPointer tupleid,
HeapTuple newtuple);
extern void AfterTriggerBeginXact(void);
extern void AfterTriggerBeginQuery(void);
extern void AfterTriggerEndQuery(EState *estate);
extern void AfterTriggerFireDeferred(void);
extern void AfterTriggerEndXact(bool isCommit);
extern void AfterTriggerBeginSubXact(void);
extern void AfterTriggerEndSubXact(bool isCommit);
extern void AfterTriggerSetState(ConstraintsSetStmt *stmt);
/*
* in utils/adt/ri_triggers.c
*/
extern bool RI_FKey_keyequal_upd_pk(Trigger *trigger, Relation pk_rel,
HeapTuple old_row, HeapTuple new_row);
extern bool RI_FKey_keyequal_upd_fk(Trigger *trigger, Relation fk_rel,
HeapTuple old_row, HeapTuple new_row);
extern bool RI_Initial_Check(FkConstraint *fkconstraint,
Relation rel,
Relation pkrel);
#define RI_TRIGGER_PK 1 /* is a trigger on the PK relation */
#define RI_TRIGGER_FK 2 /* is a trigger on the FK relation */
#define RI_TRIGGER_NONE 0 /* is not an RI trigger function */
extern int RI_FKey_trigger_type(Oid tgfoid);
#endif /* TRIGGER_H */
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