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pg_trigger.h
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pg_trigger.h
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/*-------------------------------------------------------------------------
*
* pg_trigger.h
* definition of the "trigger" system catalog (pg_trigger)
*
*
* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/catalog/pg_trigger.h
*
* NOTES
* The Catalog.pm module reads this file and derives schema
* information.
*
*-------------------------------------------------------------------------
*/
#ifndef PG_TRIGGER_H
#define PG_TRIGGER_H
#include "catalog/genbki.h"
#include "catalog/pg_trigger_d.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.
* ----------------
*/
CATALOG(pg_trigger,2620,TriggerRelationId)
{
Oid oid; /* oid */
Oid tgrelid BKI_LOOKUP(pg_class); /* relation trigger is
* attached to */
Oid tgparentid BKI_LOOKUP_OPT(pg_trigger); /* OID of parent
* trigger, if any */
NameData tgname; /* trigger's name */
Oid tgfoid BKI_LOOKUP(pg_proc); /* OID of function to be called */
int16 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 BKI_LOOKUP_OPT(pg_class); /* constraint's FROM
* table, if any */
Oid tgconstrindid BKI_LOOKUP_OPT(pg_class); /* constraint's
* supporting index, if
* any */
Oid tgconstraint BKI_LOOKUP_OPT(pg_constraint); /* associated
* pg_constraint entry,
* if any */
bool tgdeferrable; /* constraint trigger is deferrable */
bool tginitdeferred; /* constraint trigger is deferred initially */
int16 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 BKI_FORCE_NOT_NULL; /* column numbers, if trigger is
* on columns */
#ifdef CATALOG_VARLEN
bytea tgargs BKI_FORCE_NOT_NULL; /* first\000second\000tgnargs\000 */
pg_node_tree tgqual; /* WHEN expression, or NULL if none */
NameData tgoldtable; /* old transition table, or NULL if none */
NameData tgnewtable; /* new transition table, 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;
DECLARE_TOAST(pg_trigger, 2336, 2337);
DECLARE_INDEX(pg_trigger_tgconstraint_index, 2699, on pg_trigger using btree(tgconstraint oid_ops));
#define TriggerConstraintIndexId 2699
DECLARE_UNIQUE_INDEX(pg_trigger_tgrelid_tgname_index, 2701, on pg_trigger using btree(tgrelid oid_ops, tgname name_ops));
#define TriggerRelidNameIndexId 2701
DECLARE_UNIQUE_INDEX_PKEY(pg_trigger_oid_index, 2702, on pg_trigger using btree(oid oid_ops));
#define TriggerOidIndexId 2702
DECLARE_ARRAY_FOREIGN_KEY((tgrelid, tgattr), pg_attribute, (attrelid, attnum));
#ifdef EXPOSE_TO_CLIENT_CODE
/* 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)))
/*
* Macro to determine whether tgnewtable or tgoldtable has been specified for
* a trigger.
*/
#define TRIGGER_USES_TRANSITION_TABLE(namepointer) \
((namepointer) != (char *) NULL)
#endif /* EXPOSE_TO_CLIENT_CODE */
#endif /* PG_TRIGGER_H */