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Fix wording of section comparing triggers and rules; old wording as 

confusing.
This commit is contained in:
Bruce Momjian 2008-12-16 03:12:08 +00:00
parent 794ec7b063
commit 7ac5727659
1 changed files with 4 additions and 8 deletions
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12
doc/src/sgml/rules.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/rules.sgml,v 1.51 2007/02/01 19:10:24 momjian Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/rules.sgml,v 1.52 2008/12/16 03:12:08 momjian Exp $ -->
<chapter id="rules">
<title>The Rule System</title>
@ -1869,13 +1869,9 @@ GRANT SELECT ON phone_number TO secretary;
</para>
<para>
On the other hand, a trigger that is fired on
<command>INSERT</command> on a view can do the same as a rule: put
the data somewhere else and suppress the insert in the view. But
it cannot do the same thing on <command>UPDATE</command> or
<command>DELETE</command>, because there is no real data in the
view relation that could be scanned, and thus the trigger would
never get called. Only a rule will help.
On the other hand, a trigger cannot be created on views because
there is no real data in a view relation; however INSERT, UPDATE,
and DELETE rules can be created on views.
</para>
<para>