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