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plpgsql's PERFORM statement now sets FOUND depending on whether any

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rows were returned by the performed query.  Per recent pgsql-general
discussion.
This commit is contained in:
Tom Lane
2002-06-24 23:12:06 +00:00
parent e11f167718
commit 6918df16a5
2 changed files with 13 additions and 11 deletions
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12
doc/src/sgml/plsql.sgml
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@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/Attic/plsql.sgml,v 2.59 2002/06/15 19:34:51 momjian Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/Attic/plsql.sgml,v 2.60 2002/06/24 23:12:06 tgl Exp $
-->
<chapter id="plpgsql">
@ -903,7 +903,9 @@ PERFORM <replaceable>query</replaceable>;
This executes a <literal>SELECT</literal>
<replaceable>query</replaceable> and discards the
result. <application>PL/pgSQL</application> variables are substituted
in the query as usual.
in the query as usual. Also, the special variable FOUND is set to
true if the query produced at least one row, or false if it produced
no rows.
</para>
<note>
@ -916,11 +918,7 @@ PERFORM <replaceable>query</replaceable>;
<para>
An example:
<programlisting>
PERFORM create_mv(''cs_session_page_requests_mv'',''
SELECT session_id, page_id, count(*) AS n_hits,
sum(dwell_time) AS dwell_time, count(dwell_time) AS dwell_count
FROM cs_fact_table
GROUP BY session_id, page_id '');
PERFORM create_mv(''cs_session_page_requests_mv'', my_query);
</programlisting>
</para>
</sect2>