postgresql/src/include/catalog/pg_trigger.h

/*-------------------------------------------------------------------------
 *
 * pg_trigger.h
 *	  definition of the system "trigger" relation (pg_trigger)
 *	  along with the relation's initial contents.
 *
 *
 * Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * $PostgreSQL: pgsql/src/include/catalog/pg_trigger.h,v 1.28 2007/03/19 23:38:31 wieck Exp $
 *
 * NOTES
 *	  the genbki.sh script reads this file and generates .bki
 *	  information from the DATA() statements.
 *
 *-------------------------------------------------------------------------
 */
#ifndef PG_TRIGGER_H
#define PG_TRIGGER_H

/* ----------------
 *		postgres.h contains the system type definitions and the
 *		CATALOG(), BKI_BOOTSTRAP and DATA() sugar words so this file
 *		can be read by both genbki.sh and the C compiler.
 * ----------------
 */

/* ----------------
 *		pg_trigger definition.	cpp turns this into
 *		typedef struct FormData_pg_trigger
 *
 * Note: when tgconstraint is nonzero, tgisconstraint must be true, and
 * tgconstrname, tgconstrrelid, tgdeferrable, tginitdeferred are redundant
 * with the referenced pg_constraint entry.  The reason we keep these fields
 * is that we support "stand-alone" constraint triggers with no corresponding
 * pg_constraint entry.
 * ----------------
 */
#define TriggerRelationId  2620

CATALOG(pg_trigger,2620)
{
	Oid			tgrelid;		/* relation trigger is attached to */
	NameData	tgname;			/* trigger's name */
	Oid			tgfoid;			/* OID of function to be called */
	int2		tgtype;			/* BEFORE/AFTER UPDATE/DELETE/INSERT
								 * ROW/STATEMENT; see below */
	char		tgenabled;		/* trigger's firing configuration
								 * WRT session_replication_role */
	bool		tgisconstraint; /* trigger is a constraint trigger */
	NameData	tgconstrname;	/* constraint name */
	Oid			tgconstrrelid;	/* constraint's FROM table, if any */
	Oid			tgconstraint;	/* owning pg_constraint entry, if any */
	bool		tgdeferrable;	/* constraint trigger is deferrable */
	bool		tginitdeferred; /* constraint trigger is deferred initially */
	int2		tgnargs;		/* # of extra arguments in tgargs */

	/* VARIABLE LENGTH FIELDS: */
	int2vector	tgattr;			/* reserved for column-specific triggers */
	bytea		tgargs;			/* first\000second\000tgnargs\000 */
} FormData_pg_trigger;

/* ----------------
 *		Form_pg_trigger corresponds to a pointer to a tuple with
 *		the format of pg_trigger relation.
 * ----------------
 */
typedef FormData_pg_trigger *Form_pg_trigger;

/* ----------------
 *		compiler constants for pg_trigger
 * ----------------
 */
#define Natts_pg_trigger				14
#define Anum_pg_trigger_tgrelid			1
#define Anum_pg_trigger_tgname			2
#define Anum_pg_trigger_tgfoid			3
#define Anum_pg_trigger_tgtype			4
#define Anum_pg_trigger_tgenabled		5
#define Anum_pg_trigger_tgisconstraint	6
#define Anum_pg_trigger_tgconstrname	7
#define Anum_pg_trigger_tgconstrrelid	8
#define Anum_pg_trigger_tgconstraint	9
#define Anum_pg_trigger_tgdeferrable	10
#define Anum_pg_trigger_tginitdeferred	11
#define Anum_pg_trigger_tgnargs			12
#define Anum_pg_trigger_tgattr			13
#define Anum_pg_trigger_tgargs			14

/* Bits within tgtype */
#define TRIGGER_TYPE_ROW				(1 << 0)
#define TRIGGER_TYPE_BEFORE				(1 << 1)
#define TRIGGER_TYPE_INSERT				(1 << 2)
#define TRIGGER_TYPE_DELETE				(1 << 3)
#define TRIGGER_TYPE_UPDATE				(1 << 4)

/* Macros for manipulating tgtype */
#define TRIGGER_CLEAR_TYPE(type)		((type) = 0)

#define TRIGGER_SETT_ROW(type)			((type) |= TRIGGER_TYPE_ROW)
#define TRIGGER_SETT_BEFORE(type)		((type) |= TRIGGER_TYPE_BEFORE)
#define TRIGGER_SETT_INSERT(type)		((type) |= TRIGGER_TYPE_INSERT)
#define TRIGGER_SETT_DELETE(type)		((type) |= TRIGGER_TYPE_DELETE)
#define TRIGGER_SETT_UPDATE(type)		((type) |= TRIGGER_TYPE_UPDATE)

#define TRIGGER_FOR_ROW(type)			((type) & TRIGGER_TYPE_ROW)
#define TRIGGER_FOR_BEFORE(type)		((type) & TRIGGER_TYPE_BEFORE)
#define TRIGGER_FOR_INSERT(type)		((type) & TRIGGER_TYPE_INSERT)
#define TRIGGER_FOR_DELETE(type)		((type) & TRIGGER_TYPE_DELETE)
#define TRIGGER_FOR_UPDATE(type)		((type) & TRIGGER_TYPE_UPDATE)

#endif   /* PG_TRIGGER_H */