[Lazarus] TMySQL51Connection: Keep connection alive

[Andrey Smyntyna]

Hello.

I need some explanation of how to do persistent connection to MySQL
database and restore it if it has broken.

In my test project I have created TMySQL51Connection component with
KeepConnection property set to True
and additionaly before making any database operations I check connection
availability like below:

  if not dm.mysql.Connected then
      dm.mysql.Connected := True;

But sometimes I anyway get connection error with the fact that MySQL server
is present and available in network.
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