This patch implements FOR EACH STATEMENT triggers, per my email to

-hackers a couple days ago.

Notes/caveats:

        - added regression tests for the new functionality, all
          regression tests pass on my machine

        - added pg_dump support

        - updated PL/PgSQL to support per-statement triggers; didn't
          look at the other procedural languages.

        - there's (even) more code duplication in trigger.c than there
          was previously. Any suggestions on how to refactor the
          ExecXXXTriggers() functions to reuse more code would be
          welcome -- I took a brief look at it, but couldn't see an
          easy way to do it (there are several subtly-different
          versions of the code in question)

        - updated the documentation. I also took the liberty of
          removing a big chunk of duplicated syntax documentation in
          the Programmer's Guide on triggers, and moving that
          information to the CREATE TRIGGER reference page.

        - I also included some spelling fixes and similar small
          cleanups I noticed while making the changes. If you'd like
          me to split those into a separate patch, let me know.

Neil Conway

src/include/utils/rel.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: rel.h,v 1.63 2002/09/04 20:31:46 momjian Exp $
+ * $Id: rel.h,v 1.64 2002/11/23 03:59:09 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -71,7 +71,7 @@ typedef struct TriggerDesc
 	 * trigger can appear in more than one class, for each class we
 	 * provide a list of integer indexes into the triggers array.
 	 */
-#define TRIGGER_NUM_EVENT_CLASSES  4
+#define TRIGGER_NUM_EVENT_CLASSES  3
 
 	uint16		n_before_statement[TRIGGER_NUM_EVENT_CLASSES];
 	uint16		n_before_row[TRIGGER_NUM_EVENT_CLASSES];