<!--
-$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_rule.sgml,v 1.31 2002/01/24 18:28:15 tgl Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_rule.sgml,v 1.32 2002/03/10 06:00:13 momjian Exp $
PostgreSQL documentation
-->
<replaceable class="parameter">query</replaceable>
|
( <replaceable class="parameter">query</replaceable> ; <replaceable class="parameter">query</replaceable> ... )
-|
-[ <replaceable class="parameter">query</replaceable> ; <replaceable class="parameter">query</replaceable> ... ]
</synopsis>
<refsect2 id="R2-SQL-CREATERULE-1">
</para>
<para>
- The <replaceable class="parameter">action</replaceable> part of the rule
- can consist of one or more queries. To write multiple queries, surround
- them with either parentheses or square brackets. Such queries will be
- performed in the specified order (whereas there are no guarantees about
- the execution order of multiple rules for an object). The
- <replaceable class="parameter">action</replaceable> can also be NOTHING
- indicating no action. Thus, a DO INSTEAD NOTHING rule suppresses the
- original query from executing (when its condition is true); a DO NOTHING
- rule is useless.
+ The <replaceable class="parameter">action</replaceable> part of the
+ rule can consist of one or more queries. To write multiple queries,
+ surround them with parentheses. Such queries will be performed in the
+ specified order (whereas there are no guarantees about the execution
+ order of multiple rules for an object). The <replaceable
+ class="parameter">action</replaceable> can also be NOTHING indicating
+ no action. Thus, a DO INSTEAD NOTHING rule suppresses the original
+ query from executing (when its condition is true); a DO NOTHING rule
+ is useless.
</para>
<para>
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.289 2002/03/09 17:37:16 thomas Exp $
+ * $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.290 2002/03/10 06:00:13 momjian Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
RuleActionList: NOTHING { $$ = NIL; }
| RuleActionStmt { $$ = makeList1($1); }
- | '[' RuleActionMulti ']' { $$ = $2; }
| '(' RuleActionMulti ')' { $$ = $2; }
;
RuleActionList: NOTHING { $$ = make_str("nothing"); }
| RuleActionStmt { $$ = $1; }
- | '[' RuleActionMulti ']' { $$ = cat_str(3, make_str("["), $2, make_str("]")); }
| '(' RuleActionMulti ')' { $$ = cat_str(3, make_str("("), $2, make_str(")")); }
;