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Further cleanup around the edges of OPAQUE/pseudotype changes. Correct

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the declarations of some index access method support functions.  Support
SQL functions returning VOID.
This commit is contained in:
Tom Lane
2002-08-23 16:41:38 +00:00
parent cf7ee638a7
commit a2a3192802
7 changed files with 140 additions and 113 deletions
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18
doc/src/sgml/xfunc.sgml
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@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/xfunc.sgml,v 1.55 2002/08/22 00:01:40 tgl Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/xfunc.sgml,v 1.56 2002/08/23 16:41:37 tgl Exp $
-->
<chapter id="xfunc">
@ -170,22 +170,26 @@ CREATE FUNCTION tp1 (integer, numeric) RETURNS numeric AS '
<command>DELETE</command>) as well
as <command>SELECT</command> queries. However, the final command
must be a <command>SELECT</command> that returns whatever is
specified as the function's return type.
specified as the function's return type. Alternatively, if you
want to define a SQL function that performs actions but has no
useful value to return, you can define it as returning <type>void</>.
In that case it must not end with a <command>SELECT</command>.
For example:
<programlisting>
CREATE FUNCTION clean_EMP () RETURNS integer AS '
CREATE FUNCTION clean_EMP () RETURNS void AS '
DELETE FROM EMP
WHERE EMP.salary &lt;= 0;
SELECT 1 AS ignore_this;
' LANGUAGE SQL;
SELECT clean_EMP();
</programlisting>
<screen>
x
---
1
clean_emp
-----------
(1 row)
</screen>
</para>