"Steve Howe" <howe@carcass.dhs.org> writes:
> I downloaded the PostgreSQL v7.12 sources, compiled libpq.dll using
> Microsoft's Visual C++ 6.0, and tried sending a large query.
> The problem is, when the query is > 8192 large, a NULL pointer is
> returned from PQexec().
It sure sounds to me like you are invoking an old (6.5 or before) libpq.
Perhaps you should check around to see if there are multiple libpq.dll
files on your system ...
regards, tom lane