From d13fe2900042a8d07c24235ede1892ff171c9f0f Mon Sep 17 00:00:00 2001
From: Bruce Momjian <bruce@momjian.us>
Date: Sun, 14 Mar 1999 05:15:08 +0000
Subject: [PATCH] I have a problem with Access97 not working properly when
entering new records using a sub form, i.e. entering a new order/orderlines
or master and detail tables. The problem is caused by a SQL statement that
Access97 makes involving NULL. The syntax that fails is "column_name" =
NULL. The following attachment was provided by -Jose'-. It contains a very
small enhancement to gram.y that will allow Access97 to work properly with
sub forms. Can this enhancement be added to release 6.5?
<<gram.patch>>
Thanks, Michael
---
src/backend/parser/gram.c | 2 +-
src/backend/parser/gram.y | 4 +++-
2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/src/backend/parser/gram.c b/src/backend/parser/gram.c
index e2e914239c5..3d090fed1c6 100644
--- a/src/backend/parser/gram.c
+++ b/src/backend/parser/gram.c
@@ -242,7 +242,7 @@
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/parser/Attic/gram.c,v 2.76 1999/03/07 03:34:06 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/backend/parser/Attic/gram.c,v 2.77 1999/03/14 05:14:59 momjian Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index 7afc2d90075..a94adbb00a5 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.58 1999/03/07 03:34:10 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.59 1999/03/14 05:15:08 momjian Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@@ -3702,6 +3702,8 @@ a_expr: attr opt_indirection
{ $$ = makeA_Expr(OP, "<", $1, $3); }
| a_expr '>' a_expr
{ $$ = makeA_Expr(OP, ">", $1, $3); }
+ | a_expr '=' NULL_P
+ { $$ = makeA_Expr(ISNULL, NULL, $1, NULL); }
| a_expr '=' a_expr
{ $$ = makeA_Expr(OP, "=", $1, $3); }
| ':' a_expr
--
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