Re: Bug report - ODBC Driver - Error 42P18

On 02/28/2014 06:20 PM, Consolity Inc wrote:
> The PostgreSQL ANSI ODBC driver reports 42P18 - ERROR: could not determine data type of parameter $<n>; when
preparingSQL with an expression of the form: 
> <bound parameter> IS NULL.
> This is a breaking change to existing code that depends on being able to check the NULL-ness of a parameter.
> Behavior is new as of psqlODBC 09.03.0100

The default for UseServerSidePrepare changed in 09.03.0100. Maybe it's
because of that? You can try setting UseServerSidePrepare=0 to get the
old behavior.

I would recommend modifying the query to explicitly cast the parameter,
though. Something like "?::text IS NULL" should work.

- Heikki