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* C-Interface Amound of Tupels in Result after COPYout
@ 2007-11-15 12:15 Bert Horvath <bert.horvath@fh-erfurt.de>
0 siblings, 1 reply; 5+ messages in thread
From: Bert Horvath @ 2007-11-15 12:15 UTC (permalink / raw)
To: pgsql-interfaces
Hi,
do i have any chance to get the amount of tupels in the result set after
executing a query with a copy command? Its not a problem to count the
columns with PQnFields(*conn,*result) but there is no documentation für
PQnTupels(*conn,*result) and it does not work.
greetings
beho
^ permalink raw reply [nested|flat] 5+ messages in thread
* Re: C-Interface Amound of Tupels in Result after COPYout
@ 2007-11-15 15:27 Tom Lane <tgl@sss.pgh.pa.us>
parent: Bert Horvath <bert.horvath@fh-erfurt.de>
0 siblings, 1 reply; 5+ messages in thread
From: Tom Lane @ 2007-11-15 15:27 UTC (permalink / raw)
To: bert.horvath@fh-erfurt.de; +Cc: pgsql-interfaces
Bert Horvath <bert.horvath@fh-erfurt.de> writes:
> do i have any chance to get the amount of tupels in the result set after
> executing a query with a copy command? Its not a problem to count the
> columns with PQnFields(*conn,*result) but there is no documentation für
> PQnTupels(*conn,*result) and it does not work.
PQcmdTuples. PQnTuples is for the number of rows actually returned to
the client by a SELECT.
regards, tom lane
^ permalink raw reply [nested|flat] 5+ messages in thread
* Re: C-Interface Amound of Tupels in Result after COPYout
@ 2007-11-15 15:36 Bert Horvath <bert.horvath@fh-erfurt.de>
parent: Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 1 reply; 5+ messages in thread
From: Bert Horvath @ 2007-11-15 15:36 UTC (permalink / raw)
To: pgsql-interfaces
i have allready tryed out this it allways returns 0...
Tom Lane schrieb:
> Bert Horvath <bert.horvath@fh-erfurt.de> writes:
>> do i have any chance to get the amount of tupels in the result set after
>> executing a query with a copy command? Its not a problem to count the
>> columns with PQnFields(*conn,*result) but there is no documentation für
>> PQnTupels(*conn,*result) and it does not work.
>
> PQcmdTuples. PQnTuples is for the number of rows actually returned to
> the client by a SELECT.
>
> regards, tom lane
>
> ---------------------------(end of broadcast)---------------------------
> TIP 2: Don't 'kill -9' the postmaster
>
--
Bert Horvath
MSc Angewandte Informatik
FB Gebäudetechnik und Informatik
wissenschaftlicher Mitarbeiter, Projekt MoSDeP
Fachhochschule Erfurt - University of Applied Sciences
Altonaer Str. 25, D-99085 Erfurt (Haus 10, Raum 10.01.09)
Tel: +49 361 / 6700 - 393
Fax: +49 361 / 6700 - 8960
E-Mail: bert.horvath@fh-erfurt.de
^ permalink raw reply [nested|flat] 5+ messages in thread
* Re: C-Interface Amound of Tupels in Result after COPYout
@ 2007-11-15 16:14 Tom Lane <tgl@sss.pgh.pa.us>
parent: Bert Horvath <bert.horvath@fh-erfurt.de>
0 siblings, 1 reply; 5+ messages in thread
From: Tom Lane @ 2007-11-15 16:14 UTC (permalink / raw)
To: bert.horvath@fh-erfurt.de; +Cc: pgsql-interfaces
Bert Horvath <bert.horvath@fh-erfurt.de> writes:
> Tom Lane schrieb:
>> PQcmdTuples. PQnTuples is for the number of rows actually returned to
>> the client by a SELECT.
> i have allready tryed out this it allways returns 0...
Try a more recent release.
[ checks code... ] Looks like the count was added to COPY's command
status in 8.2.
regards, tom lane
^ permalink raw reply [nested|flat] 5+ messages in thread
* Re: C-Interface Amound of Tupels in Result after COPYout
@ 2007-11-15 16:56 Tom Lane <tgl@sss.pgh.pa.us>
parent: Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 0 replies; 5+ messages in thread
From: Tom Lane @ 2007-11-15 16:56 UTC (permalink / raw)
To: bert.horvath@fh-erfurt.de; +Cc: pgsql-interfaces
Bert Horvath <bert.horvath@fh-erfurt.de> writes:
> Small example:
> create table foo(bar integer);
> insert into foo values(1),(2),(3);
> res = PQexec(conn, "COPY foo TO stdout;");
> if ( PQresultStatus( res ) == PGRES_COPY_OUT )
> {
> printf("RowCount: ");
> printf("%s\n",PQcmdTuples(res)); // this is NULL
> ...
Wrong result --- at that point you've only started the COPY, not
completed it, so how would it know how many rows there are?
You need to look at the PGRES_COMMAND_OK result after the COPY.
regards, tom lane
^ permalink raw reply [nested|flat] 5+ messages in thread
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2007-11-15 12:15 C-Interface Amound of Tupels in Result after COPYout Bert Horvath <bert.horvath@fh-erfurt.de>
2007-11-15 15:27 ` Tom Lane <tgl@sss.pgh.pa.us>
2007-11-15 15:36 ` Bert Horvath <bert.horvath@fh-erfurt.de>
2007-11-15 16:14 ` Tom Lane <tgl@sss.pgh.pa.us>
2007-11-15 16:56 ` Tom Lane <tgl@sss.pgh.pa.us>
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