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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
View file

@ -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>

12
src/pl/plpgsql/src/pl_exec.c
View file

@ -3,7 +3,7 @@
* procedural language
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/pl/plpgsql/src/pl_exec.c,v 1.55 2002/03/25 07:41:10 tgl Exp $
* $Header: /cvsroot/pgsql/src/pl/plpgsql/src/pl_exec.c,v 1.56 2002/06/24 23:12:06 tgl Exp $
*
* This software is copyrighted by Jan Wieck - Hamburg.
*
@ -969,9 +969,11 @@ exec_stmt_assign(PLpgSQL_execstate * estate, PLpgSQL_stmt_assign * stmt)
else
{
/*
* PERFORM: evaluate query and discard result. This cannot share
* code with the assignment case since we do not wish to
* constraint the discarded result to be only one row/column.
* PERFORM: evaluate query and discard result (but set FOUND
* depending on whether at least one row was returned).
*
* This cannot share code with the assignment case since we do not
* wish to constrain the discarded result to be only one row/column.
*/
int rc;
@ -985,6 +987,8 @@ exec_stmt_assign(PLpgSQL_execstate * estate, PLpgSQL_stmt_assign * stmt)
if (rc != SPI_OK_SELECT)
elog(ERROR, "query \"%s\" didn't return data", expr->query);
exec_set_found(estate, (estate->eval_processed != 0));
exec_eval_cleanup(estate);
}