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Diffstat (limited to 'src/include/catalog/pg_trigger.h')
| -rw-r--r-- | src/include/catalog/pg_trigger.h | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/src/include/catalog/pg_trigger.h b/src/include/catalog/pg_trigger.h new file mode 100644 index 0000000..9612b9b --- /dev/null +++ b/src/include/catalog/pg_trigger.h @@ -0,0 +1,137 @@ +/*------------------------------------------------------------------------- + * + * pg_trigger.h + * definition of the "trigger" system catalog (pg_trigger) + * + * + * Portions Copyright (c) 1996-2020, 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; /* relation trigger is attached to */ + Oid tgparentid; /* OID of parent trigger, if any */ + NameData tgname; /* trigger's name */ + Oid tgfoid; /* 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; /* 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 */ + 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; /* 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; + +#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 */ |