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procedure TForm1.MySQLServer1ConnectionLost(Sender: TObject; Component: TComponent; ConnLostCause: TConnLostCause;
var RetryMode: TRetryMode);
begin
//
end;

get
[DCC Error] Unit1.pas(911): E2003 Undeclared identifier: 'TConnLostCause'

Hello,

To solve the problem, you should add the MemData unit to the USES clause of your unit. You can find a note about that in the description of the OnConnectionLost event in the UniDAC documentation.

i have been looking for UniDAC documentation, but where to find it?

You can access UniDAC documentation through Delphi Main menu->UniDAC->UniDAC help.