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I have a database with a blob field that can accept NULL values. When I try to put a NULL in this field with ParamByName("myfield")->Clear() in C++ I receive an error EDatabaseError 'No value for parameter 'myfield''. With a field that is not a blob it works OK. Can anybody help me.

I can not reproduce the problem.
Please send me a complete small sample to dmitryg*devart*com to demonstrate it, including a script to create and fill table.

Also supply me the following information:
- the exact version of DbxSda;
- the exact version of your IDE;
- the exact version of SQL server.