Rephrase 'Cannot insert into a view' and related messages, per

pghackers discussion around 31-Jul-02.

Author: tglsfdc

src/backend/rewrite/rewriteHandler.c

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteHandler.c,v 1.106 2002/08/26 17:53:58 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteHandler.c,v 1.107 2002/08/29 06:05:27 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1237,13 +1237,16 @@ QueryRewrite(Query *parsetree)
 				switch (query->commandType)
 				{
 					case CMD_INSERT:
-						elog(ERROR, "Cannot insert into a view without an appropriate rule");
+						elog(ERROR, "Cannot insert into a view"
+							 "\n\tYou need an unconditional ON INSERT DO INSTEAD rule");
 						break;
 					case CMD_UPDATE:
-						elog(ERROR, "Cannot update a view without an appropriate rule");
+						elog(ERROR, "Cannot update a view"
+							 "\n\tYou need an unconditional ON UPDATE DO INSTEAD rule");
 						break;
 					case CMD_DELETE:
-						elog(ERROR, "Cannot delete from a view without an appropriate rule");
+						elog(ERROR, "Cannot delete from a view"
+							 "\n\tYou need an unconditional ON DELETE DO INSTEAD rule");
 						break;
 					default:
 						elog(ERROR, "QueryRewrite: unexpected commandType %d",