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I'm using MyDAC 4.40.0.23 with Delphi 5 and got the following exception:

Assertion failure (d:\Projects\Delphi\Mydac\Source\MySqlApiDirect.pas, Zeile 548)

What is this assertion checking?

This is an internal check if connection parameters is set.
To solve the problem please give its more detailed description.

I've got the same message with the last version 5.90 on D7. I would like to use a 24H/24H client S/W without MySQL disconnection on MyIsam database.

So I added TCustomMyConnection.Ping every minute in a timer.

But when the Ping start during a query : I've got this error.

How to check if a query is running ?
With TCustomMyConnection.InTransaction ?

Thx for your support

cherubinc wrote:I've got the same message with the last version 5.90 on D7.

Code: Select all

Assertion failure (D:\Projects\Delphi\Dac\MySql\Source\MySqlApiDirect.pas, line 555)

I would like to use a 24H/24H client S/W without MySQL disconnection on MyIsam database.

So I added TCustomMyConnection.Ping every minute in a timer.

But when the Ping start during a query : I've got this error.

How to check if a query is running ?
With TCustomMyConnection.InTransaction ?

Thx for your support

See MyDAC help about LocalFailOver

cherubinc wrote:So I added TCustomMyConnection.Ping every minute in a timer.
But when the Ping start during a query : I've got this error.

I can not reproduce the problem. Please try to compose a small sample to demonstrate the problem and send it to dmitryg*devart*com.
Note: MyDAC can work in multithreaded applications, so it is thread safe. But the restriction is that you cannot use one component for more than one thread simultaneously.