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Diffstat (limited to 'doc/src/sgml/trigger.sgml')
| -rw-r--r-- | doc/src/sgml/trigger.sgml | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/doc/src/sgml/trigger.sgml b/doc/src/sgml/trigger.sgml index ac4812278e7..473e107c840 100644 --- a/doc/src/sgml/trigger.sgml +++ b/doc/src/sgml/trigger.sgml @@ -1,4 +1,4 @@ -<!-- $PostgreSQL: pgsql/doc/src/sgml/trigger.sgml,v 1.55 2009/04/07 04:02:41 momjian Exp $ --> +<!-- $PostgreSQL: pgsql/doc/src/sgml/trigger.sgml,v 1.56 2009/05/27 01:18:06 tgl Exp $ --> <chapter id="triggers"> <title>Triggers</title> @@ -250,6 +250,14 @@ </para> <para> + If your trigger function is written in any of the standard procedural + languages, then the above statements apply only if the function is + declared <literal>VOLATILE</>. Functions that are declared + <literal>STABLE</> or <literal>IMMUTABLE</> will not see changes made by + the calling command in any case. + </para> + + <para> Further information about data visibility rules can be found in <xref linkend="spi-visibility">. The example in <xref linkend="trigger-example"> contains a demonstration of these rules. |