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Add a WHEN clause to CREATE TRIGGER, allowing a boolean expression to be

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checked to determine whether the trigger should be fired.

For BEFORE triggers this is mostly a matter of spec compliance; but for AFTER
triggers it can provide a noticeable performance improvement, since queuing of
a deferred trigger event and re-fetching of the row(s) at end of statement can
be short-circuited if the trigger does not need to be fired.

Takahiro Itagaki, reviewed by KaiGai Kohei.
This commit is contained in:
Tom Lane
2009-11-20 20:38:12 +00:00
parent 201a45c4fa
commit 7fc0f06221
27 changed files with 783 additions and 100 deletions
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4
src/include/commands/trigger.h
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@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/commands/trigger.h,v 1.77 2009/10/26 02:26:41 tgl Exp $
* $PostgreSQL: pgsql/src/include/commands/trigger.h,v 1.78 2009/11/20 20:38:11 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -104,7 +104,7 @@ extern PGDLLIMPORT int SessionReplicationRole;
#define TRIGGER_FIRES_ON_REPLICA 'R'
#define TRIGGER_DISABLED 'D'
extern Oid CreateTrigger(CreateTrigStmt *stmt,
extern Oid CreateTrigger(CreateTrigStmt *stmt, const char *queryString,
Oid constraintOid, Oid indexOid, const char *prefix,
bool checkPermissions);