Re: "IN" statement causing execution cancel?

All,

I am having (yet another) problem.

I am attempting to execute, via ODBC (thus, the PostgreSQL ODBC driver
under Windows), a statement of the form:

SELECT field1 FROM table WHERE field2 IN (list);

Where "list" is a *very* long comma-delimited list of values (on the
order of several hundred values).

When I attempt to execute this query via the ODBC driver, a very long
wait occurs (one minute or so), then I get back an error of "Execution
Cancelled" - this error is reported both to my application, as well as
in the error logs for the server PostgreSQL (7.3.2) is running on. I
have also noticed the same error in the commlog you can set up to be
created in the ODBC driver setup.

The log also gives a strange error of an invalid character or something
found at position 15 of my SQL statement - which makes no sense since
that character is part of the field name, plus if I limit my search to
only a few (say 10-20) values in the "IN" list, I don't get any error.

What is strange, is that if I execute this same statement under psql
(that is, the large list), it executes it fine, returning the expected
results.

I need to use ODBC for this application (it is a VB app). I have given
thought to re-writing my SQL statement generation code to split it up
into several SQL statements to be executed, and collate the results when
they come back. However, this is a bandaid to the problem. BTW - running
the same large query against my Access 97 DB gives back the results
expected (ie, via JET - not ODBC).

Is there some ODBC driver config option, or something on the server,
that needs to be properly set for this to work? Is there a limit on the
size of the IN value list?

Thank you,

Andrew L. Ayers
Phoenix, Arizona


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