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Table function support for PL/Python

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This allows functions with multiple OUT parameters returning both one
or multiple records (RECORD or SETOF RECORD).

Jan Urbański, reviewed by Hitoshi Harada
This commit is contained in:
Peter Eisentraut
2011-02-26 16:53:11 +02:00
parent 772dcfe7c0
commit bc411f25c1
9 changed files with 748 additions and 51 deletions
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36
doc/src/sgml/plpython.sgml
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@ -390,18 +390,6 @@ $$ LANGUAGE plpythonu;
return type and the Python data type of the actual return object
are not flagged; the value will be converted in any case.
</para>
<tip>
<para>
<application>PL/Python</application> functions cannot return
either type <type>RECORD</type> or <type>SETOF RECORD</type>. A
workaround is to write a <application>PL/pgSQL</application>
function that creates a temporary table, have it call the
<application>PL/Python</application> function to fill the table,
and then have the <application>PL/pgSQL</application> function
return the generic <type>RECORD</type> from the temporary table.
</para>
</tip>
</sect2>
<sect2>
@ -593,6 +581,17 @@ $$ LANGUAGE plpythonu;
</varlistentry>
</variablelist>
</para>
<para>
Functions with <literal>OUT</literal> parameters are also supported. For example:
<programlisting>
CREATE FUNCTION multiout_simple(OUT i integer, OUT j integer) AS $$
return (1, 2)
$$ LANGUAGE plpythonu;
SELECT * FROM multiout_simple();
</programlisting>
</para>
</sect2>
<sect2>
@ -692,6 +691,19 @@ $$ LANGUAGE plpythonu;
</varlistentry>
</variablelist>
</para>
<para>
Set-returning functions with <literal>OUT</literal> parameters
(using <literal>RETURNS SETOF record</literal>) are also
supported. For example:
<programlisting>
CREATE FUNCTION multiout_simple_setof(n integer, OUT integer, OUT integer) RETURNS SETOF record AS $$
return [(1, 2)] * n
$$ LANGUAGE plpythonu;
SELECT * FROM multiout_simple_setof(3);
</programlisting>
</para>
</sect2>
</sect1>