I have a problem with Access97 not working properly when entering new

bmomjian · bmomjian · commit d13fe2900042 · 1999-03-14T05:15:08.000Z
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?

 &lt;&lt;gram.patch&gt;&gt;
Thanks, Michael
diff --git 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
@@ -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

Original file line number	Diff line number	Diff line change
`@@ -242,7 +242,7 @@`
`242`	`242`	`*`
`243`	`243`	`*`
`244`	`244`	`* IDENTIFICATION`
`245`		`- * $Header: /cvsroot/pgsql/src/backend/parser/Attic/gram.c,v 2.76 1999/03/07 03:34:06 momjian Exp $`
	`245`	`+ * $Header: /cvsroot/pgsql/src/backend/parser/Attic/gram.c,v 2.77 1999/03/14 05:14:59 momjian Exp $`
`246`	`246`	`*`
`247`	`247`	`* HISTORY`
`248`	`248`	`* AUTHOR DATE MAJOR EVENT`
Original file line number	Diff line number	Diff line change
`@@ -10,7 +10,7 @@`
`10`	`10`	`*`
`11`	`11`	`*`
`12`	`12`	`* IDENTIFICATION`
`13`		`- * $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.58 1999/03/07 03:34:10 momjian Exp $`
	`13`	`+ * $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.59 1999/03/14 05:15:08 momjian Exp $`
`14`	`14`	`*`
`15`	`15`	`* HISTORY`
`16`	`16`	`* AUTHOR DATE MAJOR EVENT`
`@@ -3702,6 +3702,8 @@ a_expr: attr opt_indirection`
`3702`	`3702`	`{ $$ = makeA_Expr(OP, "<", $1, $3); }`
`3703`	`3703`	`\| a_expr '>' a_expr`
`3704`	`3704`	`{ $$ = makeA_Expr(OP, ">", $1, $3); }`
	`3705`	`+ \| a_expr '=' NULL_P`
	`3706`	`+ { $$ = makeA_Expr(ISNULL, NULL, $1, NULL); }`
`3705`	`3707`	`\| a_expr '=' a_expr`
`3706`	`3708`	`{ $$ = makeA_Expr(OP, "=", $1, $3); }`
`3707`	`3709`	`\| ':' a_expr`