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Add mention of no SELECT triggers.

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This commit is contained in:
Bruce Momjian 2001-11-29 22:18:14 +00:00
parent 636a939fe5
commit d1a2a01f38
1 changed files with 17 additions and 15 deletions
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32
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 1.18 2001/11/19 03:58:25 tgl Exp $ $Header: /cvsroot/pgsql/doc/src/sgml/ref/create_trigger.sgml,v 1.19 2001/11/29 22:18:14 momjian Exp $
Postgres documentation Postgres documentation
--> -->
@ -117,20 +117,22 @@ CREATE
</para> </para>
<para> <para>
The trigger can be specified to fire either before BEFORE the The trigger can be specified to fire either before BEFORE the
operation is attempted on a tuple (before constraints operation is attempted on a tuple (before constraints are checked and
are checked and the <command>INSERT</command>, <command>UPDATE</command> or the <command>INSERT</command>, <command>UPDATE</command> or
<command>DELETE</command> is attempted) or <command>DELETE</command> is attempted) or AFTER the operation has
AFTER the operation has been attempted (e.g., after constraints been attempted (e.g., after constraints are checked and the
are checked and the <command>INSERT</command>, <command>INSERT</command>, <command>UPDATE</command> or
<command>UPDATE</command> or <command>DELETE</command> has <command>DELETE</command> has completed). If the trigger fires before
completed). If the the event, the trigger may skip the operation for the current tuple,
trigger fires before the event, the trigger may or change the tuple being inserted (for <command>INSERT</command> and
skip the operation for the current tuple, or change the tuple <command>UPDATE</command> operations only). If the trigger fires
being inserted (for <command>INSERT</command> and after the event, all changes, including the last insertion, update,
<command>UPDATE</command> operations only). If or deletion, are <quote>visible</quote> to the trigger.
the trigger fires after the event, all changes, including the </para>
last insertion, update, or deletion, are <quote>visible</quote> to the trigger. <para>
<command>SELECT</command> does not modify any rows so you can not
create <command>SELECT</command> triggers.
</para> </para>
<para> <para>