This type is used for the TCustomDAConnection.OnError event. 
Unit
DBAccess
 Syntax
TDAConnectionErrorEvent = procedure (Sender: TObject; E: EDAError; var Fail: boolean) of object;
Parameters
Sender
An object that raised the event. 
E
The error information. 
Fail
False, if an error dialog should be prevented from being displayed and EAbort exception should be raised to cancel current operation .