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What could cause this message:

Assertion failure (D:\Projects\Delphi\Dac\Common\Source\CRVio.pas, line 244)

I do not have the source, so I'm unable to look it up.

Best Regards

Lars Geisler

Hello,

It is an odd situation, this error must not occur. We cannot reproduce this problem. Please try creating a small sample that demonstrates this problem and send it to andreyz*devart*com , including a script to create all needed server objects. Also please specify the following:
- the exact version of UniDAC. You can learn it from the About sheet of TUniConnection Editor;
- the exact version of your IDE;
- the exact version of database server you are working with. You can learn it from the Info sheet of TUniConnection Editor.

Yes I now it's very odd.
I can not create the error in our company, only at a customer, with some other mysterious errors.

Could you tell me what the assertion is - it might give us a clue, as to what is wrong.

Regards Lars Geisler

Please specify the way you deploy your application, with UniDAC packages built into your application, or you supply UniDAC packages with your application.

I have answered you by e-mail.

Dear AndreyZ,
Please send your solution to me([email protected]), or anwser for solv in this case.
Causing to I got it.

Best Regard,
Cmx.

Hi, The problem was that I reused a connection in both the main thread and a thread I created.

Regards Lars Geisler

Yes, the problem was caused by usage of one connection in several threads. The right way to work in a multi-threaded application is to have a connection (the TUniConnection component) in each thread.

Manny Thanks for quick respond.
That mean TSQLConnection does't work on DMServerContainer?(DataSnap), should be use TUniConnection instead?

Best regards,
CMX.

It does not mean that you should use TUniConnection instead of TSQLConnection. It means that, if your application uses several threads, you should have a connection (in your case the TSQLConnection component) in each thread.

Dear AndreyZ,
Manny thanks for your awnser. I'm use TSQLConnection, If create TSQLconnection on each thread that mean database connection is not single(DataSnap M-Tier Concept is wrong).
Ok fine!, I found something wrong in my code, I'm refresh log dataset every time when client connect to server. if remove this code cdsLog.Refresh, error is gone.

Best Regards,
CMX.

It's good to see that you have found the solution. If any other questions come up, please contact us.