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Add documentation about when trigger values NEW/OLD return NULL. 

Jeff Davis
This commit is contained in:
Bruce Momjian 2008-09-24 19:51:22 +00:00
parent fb4bb8b9c5
commit 436e6af2ad
1 changed files with 5 additions and 3 deletions
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8
doc/src/sgml/plpgsql.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/plpgsql.sgml,v 1.133 2008/07/18 03:32:51 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/plpgsql.sgml,v 1.134 2008/09/24 19:51:22 momjian Exp $ -->
<chapter id="plpgsql">
<title><application>PL/pgSQL</application> - <acronym>SQL</acronym> Procedural Language</title>
@ -3036,7 +3036,8 @@ RAISE unique_violation USING MESSAGE = 'Duplicate user ID: ' || user_id;
<para>
Data type <type>RECORD</type>; variable holding the new
database row for <command>INSERT</>/<command>UPDATE</> operations in row-level
triggers. This variable is <symbol>NULL</symbol> in statement-level triggers.
triggers. This variable is <symbol>NULL</symbol> in statement-level triggers
and for <command>DELETE</command> operations.
</para>
</listitem>
</varlistentry>
@ -3047,7 +3048,8 @@ RAISE unique_violation USING MESSAGE = 'Duplicate user ID: ' || user_id;
<para>
Data type <type>RECORD</type>; variable holding the old
database row for <command>UPDATE</>/<command>DELETE</> operations in row-level
triggers. This variable is <symbol>NULL</symbol> in statement-level triggers.
triggers. This variable is <symbol>NULL</symbol> in statement-level triggers
and for <command>INSERT</command> operations.
</para>
</listitem>
</varlistentry>