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/*-------------------------------------------------------------------------
 *
 * pg_trigger.h
 *	  definition of the system "trigger" relation (pg_trigger)
 *	  along with the relation's initial contents.
 *
 *
 * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/catalog/pg_trigger.h
 *
 * NOTES
 *	  the genbki.pl script reads this file and generates .bki
 *	  information from the DATA() statements.
 *
 *-------------------------------------------------------------------------
 */
#ifndef PG_TRIGGER_H
#define PG_TRIGGER_H

#include "catalog/genbki.h"

/* ----------------
 *		pg_trigger definition.  cpp turns this into
 *		typedef struct FormData_pg_trigger
 *
 * Note: when tgconstraint is nonzero, tgconstrrelid, tgconstrindid,
 * tgdeferrable, and tginitdeferred are largely redundant with the referenced
 * pg_constraint entry.  However, it is possible for a non-deferrable trigger
 * to be associated with a deferrable constraint.
 * ----------------
 */
#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/INSTEAD, UPDATE/DELETE/INSERT,
								 * ROW/STATEMENT; see below */
	char		tgenabled;		/* trigger's firing configuration WRT
								 * session_replication_role */
	bool		tgisinternal;	/* trigger is system-generated */
	Oid			tgconstrrelid;	/* constraint's FROM table, if any */
	Oid			tgconstrindid;	/* constraint's supporting index, if any */
	Oid			tgconstraint;	/* associated 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 start here, but we allow direct access to
	 * tgattr. Note: tgattr and tgargs must not be null.
	 */
	int2vector	tgattr;			/* column numbers, if trigger is on columns */

#ifdef CATALOG_VARLEN
	bytea		tgargs;			/* first\000second\000tgnargs\000 */
	pg_node_tree tgqual;		/* WHEN expression, or NULL if none */
#endif
} 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				15
#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_tgisinternal	6
#define Anum_pg_trigger_tgconstrrelid	7
#define Anum_pg_trigger_tgconstrindid	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
#define Anum_pg_trigger_tgqual			15

/* 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)
#define TRIGGER_TYPE_TRUNCATE			(1 << 5)
#define TRIGGER_TYPE_INSTEAD			(1 << 6)

#define TRIGGER_TYPE_LEVEL_MASK			(TRIGGER_TYPE_ROW)
#define TRIGGER_TYPE_STATEMENT			0

/* Note bits within TRIGGER_TYPE_TIMING_MASK aren't adjacent */
#define TRIGGER_TYPE_TIMING_MASK \
	(TRIGGER_TYPE_BEFORE | TRIGGER_TYPE_INSTEAD)
#define TRIGGER_TYPE_AFTER				0

#define TRIGGER_TYPE_EVENT_MASK \
	(TRIGGER_TYPE_INSERT | TRIGGER_TYPE_DELETE | TRIGGER_TYPE_UPDATE | TRIGGER_TYPE_TRUNCATE)

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

#define TRIGGER_SETT_ROW(type)			((type) |= TRIGGER_TYPE_ROW)
#define TRIGGER_SETT_STATEMENT(type)	((type) |= TRIGGER_TYPE_STATEMENT)
#define TRIGGER_SETT_BEFORE(type)		((type) |= TRIGGER_TYPE_BEFORE)
#define TRIGGER_SETT_AFTER(type)		((type) |= TRIGGER_TYPE_AFTER)
#define TRIGGER_SETT_INSTEAD(type)		((type) |= TRIGGER_TYPE_INSTEAD)
#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_SETT_TRUNCATE(type)		((type) |= TRIGGER_TYPE_TRUNCATE)

#define TRIGGER_FOR_ROW(type)			((type) & TRIGGER_TYPE_ROW)
#define TRIGGER_FOR_BEFORE(type)		(((type) & TRIGGER_TYPE_TIMING_MASK) == TRIGGER_TYPE_BEFORE)
#define TRIGGER_FOR_AFTER(type)			(((type) & TRIGGER_TYPE_TIMING_MASK) == TRIGGER_TYPE_AFTER)
#define TRIGGER_FOR_INSTEAD(type)		(((type) & TRIGGER_TYPE_TIMING_MASK) == TRIGGER_TYPE_INSTEAD)
#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)
#define TRIGGER_FOR_TRUNCATE(type)		((type) & TRIGGER_TYPE_TRUNCATE)

/*
 * Efficient macro for checking if tgtype matches a particular level
 * (TRIGGER_TYPE_ROW or TRIGGER_TYPE_STATEMENT), timing (TRIGGER_TYPE_BEFORE,
 * TRIGGER_TYPE_AFTER or TRIGGER_TYPE_INSTEAD), and event (TRIGGER_TYPE_INSERT,
 * TRIGGER_TYPE_DELETE, TRIGGER_TYPE_UPDATE, or TRIGGER_TYPE_TRUNCATE).  Note
 * that a tgtype can match more than one event, but only one level or timing.
 */
#define TRIGGER_TYPE_MATCHES(type, level, timing, event) \
	(((type) & (TRIGGER_TYPE_LEVEL_MASK | TRIGGER_TYPE_TIMING_MASK | (event))) == ((level) | (timing) | (event)))

#endif   /* PG_TRIGGER_H */

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British based Oyster Yachts makes some of the finest yachts in the world. Like every other company, they had to find a way to feed the never-ending video demands of social media – sites like Instagram and TikTok. We trained the Oyster staff to tell their own stories, using only iPhones.

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Michael on Media

Michael Rosenblum has been writing about the media since 1988. His work and ideas have appeared in The Guardian, The Huffington Post, Ilkeston Life and many other publications.

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