Merge the last few variable.c configuration variables into the generic

GUC support.  It's now possible to set datestyle, timezone, and
client_encoding from postgresql.conf and per-database or per-user
settings.  Also, implement rollback of SET commands that occur in a
transaction that later fails.  Create a SET LOCAL var = value syntax
that sets the variable only for the duration of the current transaction.
All per previous discussions in pghackers.

1 files changed, 11 insertions, 5 deletions

diff --git a/src/backend/utils/adt/datetime.c b/src/backend/utils/adt/datetime.c
index 1a908d9d6b7..d6e0358e817 100644
--- a/src/backend/utils/adt/datetime.c
+++ b/src/backend/utils/adt/datetime.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/utils/adt/datetime.c,v 1.89 2002/04/21 19:48:12 thomas Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/utils/adt/datetime.c,v 1.90 2002/05/17 01:19:18 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -3571,11 +3571,17 @@ EncodeInterval(struct tm * tm, fsec_t fsec, int style, char *str)
 }	/* EncodeInterval() */
 
 
-void
-ClearDateCache(bool dummy)
+/* GUC assign_hook for australian_timezones */
+bool
+ClearDateCache(bool newval, bool doit, bool interactive)
 {
 	int			i;
 
-	for (i = 0; i < MAXDATEFIELDS; i++)
-		datecache[i] = NULL;
+	if (doit)
+	{
+		for (i = 0; i < MAXDATEFIELDS; i++)
+			datecache[i] = NULL;
+	}
+
+	return true;
 }