pg_trigger.h

关系型数据库 Postgresql 6.5.2

/*-------------------------------------------------------------------------
 *
 * pg_trigger.h
 *
 *
 * Copyright (c) 1994, Regents of the University of California
 *
 * 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 definintions and the
 *		CATALOG(), 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
 * ----------------
 */
CATALOG(pg_trigger) BOOTSTRAP
{
	Oid			tgrelid;		/* triggered relation */
	NameData	tgname;			/* trigger' name */
	Oid			tgfoid;			/* OID of function to be called */
	int2		tgtype;			/* BEFORE/AFTER UPDATE/DELETE/INSERT
								 * ROW/STATEMENT */
	int2		tgnargs;		/* # of extra arguments in tgargs */
	int28		tgattr;			/* UPDATE of attr1, attr2 ... (NI) */
	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				7
#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_tgnargs			5
#define Anum_pg_trigger_tgattr			6
#define Anum_pg_trigger_tgargs			7

#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)

#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 */