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Commitd25ada4

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Fix libpq so that it reports PGRES_EMPTY_QUERY not PGRES_COMMAND_OK when an
empty query string is passed to PQexecParams and related functions. Itshandling of the NoData response to Describe messages was subtly incorrect.Per my report of yesterday.Although I consider this a bug, it's a behavioral change that might affectapplications, so not back-patched.In passing fix a second issue in the same code: it didn't react well to anout-of-memory failure while trying to make the PGresult object.
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‎src/interfaces/libpq/fe-protocol3.c

Lines changed: 16 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
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*
1010
* IDENTIFICATION
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* $PostgreSQL: pgsql/src/interfaces/libpq/fe-protocol3.c,v 1.37 2009/01/01 17:24:03momjian Exp $
11+
* $PostgreSQL: pgsql/src/interfaces/libpq/fe-protocol3.c,v 1.38 2009/01/09 18:50:03tgl Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -297,19 +297,24 @@ pqParseInput3(PGconn *conn)
297297
/*
298298
* NoData indicates that we will not be seeing a
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* RowDescription message because the statement or portal
300-
* inquired about doesn't return rows. Set up a COMMAND_OK
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* result, instead of TUPLES_OK.
302-
*/
303-
if (conn->result==NULL)
304-
conn->result=PQmakeEmptyPGresult(conn,
305-
PGRES_COMMAND_OK);
306-
307-
/*
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* If we're doing a Describe, we're ready to pass the
309-
* result back to the client.
300+
* inquired about doesn't return rows.
301+
*
302+
* If we're doing a Describe, we have to pass something
303+
* back to the client, so set up a COMMAND_OK result,
304+
* instead of TUPLES_OK. Otherwise we can just ignore
305+
* this message.
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*/
311307
if (conn->queryclass==PGQUERY_DESCRIBE)
308+
{
309+
if (conn->result==NULL)
310+
{
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conn->result=PQmakeEmptyPGresult(conn,
312+
PGRES_COMMAND_OK);
313+
if (!conn->result)
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return;
315+
}
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conn->asyncStatus=PGASYNC_READY;
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}
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break;
314319
case't':/* Parameter Description */
315320
if (getParamDescriptions(conn))

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