[erlang-questions] Null parameter for ODBC param_query

Andy Richards <>
Thu Apr 19 15:24:16 CEST 2012


Hi all,

I found this previous unanswered post to the mailing list and I now face the same problem....

http://erlang.2086793.n4.nabble.com/NULL-parameter-for-ODBC-param-query-td3226735.html

> "Is it possible to use null values in a parameterised odbc param_query? 
> 
> example: odbc:param_query("exec User_Read ?", [{sql_integer, Param}]).  % 
> Param is either an integer or null 
> 
> The odbc driver returns the 'null' atom when selecting rows, but I haven't 
> found a value that allows me to specify a null parameter ('null', 'NULL', 
> <<"null">>, etc...)"


According to the documentation value = null | term() however an exception is thrown if the atom null is used?

Has anyone come across this or are there any workarounds to this issue ? 

I've already patched the c portion of the odbc driver to resolve a socket issue under Linux so I'm wondering if this module is used much in the Erlang world?

Many thanks,

Andy.



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