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I have code that is trying to insert blob data into a blob field in a MySQL database.

I am using TMyQuery and TParam.LoadFromStream(MemoryStream, ftBlob), but I get an AV when the statement is executed with the following call stack

:007f1289 TDAParam.GetIsNull + $11
:00802742 TCustomDASQL.WriteParams + $A6
:00803158 TCustomDASQL.DefineProperties
:d68bd88b

The code is part of a generic component that works with different dataset types and works with other sets, such as TADOQuery.

Is this my problem or MyDAC's problem?

I am using MyDAC 7.1.4 in Delphi XE and XE2.

Hello,

You must not use the TParam class, you have to use TDAParam class instead ( TDAParam.LoadFromStream(MemoryStream, ftBlob) )

It seems that the object is TDAParam in reality. I am getting it from TMyQuery.Params.

But LoadFromStream is not virtual, I see. I got it working now, ensuring TDAParam.LoadFromStream is used.

Thanks!

It is good to see that the problem was solved. Feel free to contact us if you have any further questions about MyDAC.