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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"> <chapter id="plpgsql">
@@ -903,7 +903,9 @@ PERFORM <replaceable>query</replaceable>;
This executes a <literal>SELECT</literal> This executes a <literal>SELECT</literal>
<replaceable>query</replaceable> and discards the <replaceable>query</replaceable> and discards the
result. <application>PL/pgSQL</application> variables are substituted 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> </para>
<note> <note>
@@ -916,11 +918,7 @@ PERFORM <replaceable>query</replaceable>;
<para> <para>
An example: An example:
<programlisting> <programlisting>
PERFORM create_mv(''cs_session_page_requests_mv'','' PERFORM create_mv(''cs_session_page_requests_mv'', my_query);
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 '');
</programlisting> </programlisting>
</para> </para>
</sect2> </sect2>

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

@@ -3,7 +3,7 @@
* procedural language * procedural language
* *
* IDENTIFICATION * 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. * This software is copyrighted by Jan Wieck - Hamburg.
* *
@@ -969,9 +969,11 @@ exec_stmt_assign(PLpgSQL_execstate * estate, PLpgSQL_stmt_assign * stmt)
else else
{ {
/* /*
* PERFORM: evaluate query and discard result. This cannot share * PERFORM: evaluate query and discard result (but set FOUND
* code with the assignment case since we do not wish to * depending on whether at least one row was returned).
* constraint the discarded result to be only one row/column. *
* 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; int rc;
@@ -985,6 +987,8 @@ exec_stmt_assign(PLpgSQL_execstate * estate, PLpgSQL_stmt_assign * stmt)
if (rc != SPI_OK_SELECT) if (rc != SPI_OK_SELECT)
elog(ERROR, "query \"%s\" didn't return data", expr->query); elog(ERROR, "query \"%s\" didn't return data", expr->query);
exec_set_found(estate, (estate->eval_processed != 0));
exec_eval_cleanup(estate); exec_eval_cleanup(estate);
} }