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With the pessimistic locking protocol a row lock is obtained when the Edit method is called.As long as the row is being edited Elevate DB will hold a row lock on that row, and will not release this lock until either the methods is called.As String:='5551212'; Field By Name(' Fax'). As String:='5551616'; Field By Name(' Email'). As String:='[email protected]'; Post; end; except on E: Exception do begin if (E is EEDBError) then begin if (EEDBError(E). Message); end; end; end; method allows you to begin the process of editing an existing row in the dataset.Error Code=EDB_ERROR_CONSTRAINT) then Show Message(' This row violates a table or column constraint (' E. Elevate DB offers the choice of a pessimistic or optimistic locking protocol, which is configurable via the Record Lock Protocol property for the TEDBSession assigned to the current dataset (see the Session Name property for more information on setting the session for a dataset).You may use the event to trap for any of these error conditions and display a message to the user.You can also use a try..except block to do the same, and the approach is very similar.
Any updates to the row are done via a row buffer and do not actually exist in the actual dataset until the row is posted using the Post method.As String:='5551212'; Field By Name(' Fax'). As String:='5551616'; Field By Name(' Email'). As String:='[email protected]'; Post; end; end; If the row that is being posted violates a table constraint for the dataset then an EEDBError exception will be raised with the error code 1004 (EDB_ERROR_CONSTRAINT).Please see the Exception Handling and Errors and Appendix A - Error Codes and Messages topics for general information on exception handling in Elevate DB.Error Code=EDB_ERROR_CONSTRAINT) then Show Message(' This row violates a table or column constraint (' E. Because of this, you must always first determine whether the exception object being passed is actually an EEDBError before casting the exception object and trying to access specific properties such as the Error Code property.The EEDBError object descends from the EDatabase Error object.begin try with My EDBData Set do begin Append; Field By Name(' Customer ID').