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When I try to execute sql query from delphi7 it throws the following exception ORA-01704: string literal too long. I know the reason why its throwing this exception. My problem is.... I have catched this exception throw Try.... Except block.....In except block i am performing rollback..... due to above error its also throwing exception in rollback transaction...........due to rollback exception...........it had created some problem in connection...........every time when i try to open or close a connection it throws an exception " Operation is not allowed when the object is open"