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体验新版 GitCode,发现更多精彩内容 >>
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d1a2a01f
编写于
11月 29, 2001
作者:
B
Bruce Momjian
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差异文件
Add mention of no SELECT triggers.
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doc/src/sgml/ref/create_trigger.sgml
doc/src/sgml/ref/create_trigger.sgml
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doc/src/sgml/ref/create_trigger.sgml
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d1a2a01f
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_trigger.sgml,v 1.1
8 2001/11/19 03:58:25 tgl
Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_trigger.sgml,v 1.1
9 2001/11/29 22:18:14 momjian
Exp $
Postgres documentation
-->
...
...
@@ -117,20 +117,22 @@ CREATE
</para>
<para>
The trigger can be specified to fire either before BEFORE the
operation is attempted on a tuple (before constraints
are checked and the <command>INSERT</command>, <command>UPDATE</command> or
<command>DELETE</command> is attempted) or
AFTER the operation has been attempted (e.g., after constraints
are checked and the <command>INSERT</command>,
<command>UPDATE</command> or <command>DELETE</command> has
completed). If the
trigger fires before the event, the trigger may
skip the operation for the current tuple, or change the tuple
being inserted (for <command>INSERT</command> and
<command>UPDATE</command> operations only). If
the trigger fires after the event, all changes, including the
last insertion, update, or deletion, are <quote>visible</quote> to the trigger.
The trigger can be specified to fire either before BEFORE the
operation is attempted on a tuple (before constraints are checked and
the <command>INSERT</command>, <command>UPDATE</command> or
<command>DELETE</command> is attempted) or AFTER the operation has
been attempted (e.g., after constraints are checked and the
<command>INSERT</command>, <command>UPDATE</command> or
<command>DELETE</command> has completed). If the trigger fires before
the event, the trigger may skip the operation for the current tuple,
or change the tuple being inserted (for <command>INSERT</command> and
<command>UPDATE</command> operations only). If the trigger fires
after the event, all changes, including the last insertion, update,
or deletion, are <quote>visible</quote> to the trigger.
</para>
<para>
<command>SELECT</command> does not modify any rows so you can not
create <command>SELECT</command> triggers.
</para>
<para>
...
...
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