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Hi,

After updating to UniDAC 5.2.5 with PostgreSQL provider, our master-detail relationships stopped working when the master query is empty (error pgError "could not determine data type of parameter $1.")

- Master-detail relationship is defined as "id->id_master", and LocalMasterDetail=False.
We checked the query SQL with DBMonitor and the query is a bit strange: If we make UnpreparedExecute=True in Detail query options, the query is the same, but there is no error.

We expected the query to be:
or Please note that everything was working fine with the previous version of UniDAC.

Regards,

Hello,

To solve the problem, there is no need to modify the UnpreparedExecute property, it's enough to set the UseParamTypes property to True

Thanks AlexP,

Your sugestion fixed the problem.

Shouldn't the UseParamTypes property default value be True ?
When should we make UseParamTypes=False and UseParamTypes=True ?

Regards,

Hello,

Set the UseParamTypes option to True to disable automatic detection of parameter types. When this option is True, data types of parameters are set basing on the DataType property. When this option is False, data types of the parameters are detected by server automatically.

P.S. We cannot change this property value, since this modification will change the behavior in the existing users' projects.

In firebird 2.1 and 2.5 have the same problem.

We will change this behaviour in the next version of UniDAC. A query that takes into account NULL values will be generated optionally. By default an old query will be generated. Thus, there will no necessity for you to change the value of the UseParamTypes property.