Re: C-Interface Amound of Tupels in Result after COPYout

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