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Improvement to CREATE TRIGGER and catalog documentation.

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Neil Conway
This commit is contained in:
Bruce Momjian
2002-12-17 17:41:30 +00:00
parent e5bdd8d6f8
commit 49077e87af
2 changed files with 24 additions and 14 deletions
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17
doc/src/sgml/ref/create_trigger.sgml
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@@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_trigger.sgml,v 1.30 2002/11/23 03:59:06 momjian Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_trigger.sgml,v 1.31 2002/12/17 17:41:30 momjian Exp $
PostgreSQL documentation
-->
@@ -21,9 +21,8 @@ PostgreSQL documentation
<date>2000-03-25</date>
</refsynopsisdivinfo>
<synopsis>
CREATE TRIGGER <replaceable class="PARAMETER">name</replaceable> {
BEFORE | AFTER } { <replaceable class="PARAMETER">event</replaceable> [ OR ... ] }
ON <replaceable class="PARAMETER">table</replaceable> [ FOR EACH { ROW | STATEMENT } ]
CREATE TRIGGER <replaceable class="PARAMETER">name</replaceable> { BEFORE | AFTER } { <replaceable class="PARAMETER">event</replaceable> [ OR ... ] }
ON <replaceable class="PARAMETER">table</replaceable> [ FOR [ EACH ] { ROW | STATEMENT } ]
EXECUTE PROCEDURE <replaceable class="PARAMETER">func</replaceable> ( <replaceable class="PARAMETER">arguments</replaceable> )
</synopsis>
@@ -186,7 +185,9 @@ CREATE TRIGGER
deleted tuple. In contrast, a trigger that executes <literal>FOR
EACH STATEMENT</literal> of the specified operation only executes
once for any given operation, regardless of how many rows it
modifies.
modifies (in particular, an operation that modifies zero rows will
still result in the execution of any applicable <literal>FOR EACH
STATEMENT</literal> triggers).
</para>
<para>
@@ -330,6 +331,12 @@ CREATE TABLE distributors (
time-of-creation order. <productname>PostgreSQL</productname>
uses name order, which was judged more convenient to work with.
</para>
<para>
The ability to specify multiple actions for a single trigger
using <literal>OR</literal> is a <productname>PostgreSQL</>
extension of the SQL standard.
</para>
</listitem>
</varlistentry>
</variablelist>