postgresql/src/include/commands/trigger.h

/*-------------------------------------------------------------------------
 *
 * trigger.h--
 *	  prototypes for trigger.c.
 *
 *
 *-------------------------------------------------------------------------
 */
#ifndef TRIGGER_H
#define TRIGGER_H

#include "access/tupdesc.h"
#include "access/htup.h"
#include "utils/rel.h"

typedef uint32	TriggerEvent;

typedef struct TriggerData
{
	TriggerEvent	tg_event;
	Relation		tg_relation;
	HeapTuple		tg_trigtuple;
	HeapTuple		tg_newtuple;
	Trigger		   *tg_trigger;
}				TriggerData;

extern TriggerData *CurrentTriggerData;

#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

#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))


extern void		CreateTrigger(CreateTrigStmt * stmt);
extern void		DropTrigger(DropTrigStmt * stmt);
extern void		RelationRemoveTriggers(Relation rel);

extern HeapTuple ExecBRInsertTriggers(Relation rel, HeapTuple tuple);
extern void		ExecARInsertTriggers(Relation rel, HeapTuple tuple);
extern bool		ExecBRDeleteTriggers(Relation rel, ItemPointer tupleid);
extern void		ExecARDeleteTriggers(Relation rel, ItemPointer tupleid);
extern HeapTuple ExecBRUpdateTriggers(Relation rel, ItemPointer tupleid, HeapTuple tuple);
extern void		ExecARUpdateTriggers(Relation rel, ItemPointer tupleid, HeapTuple tuple);

#endif							/* TRIGGER_H */