TDataDriverEh = class(TComponent, IDataDriverConsumerEh, IUnknown);
TDataDriverEh - carry out two tasks:
1. Delivers data to TMemTableEh.
2. Processes changed records of TMemTableEh (writes them in other dataset, or call events for processing the changes in program).
Furthermore, there are several components that inherited from TDataDriverEh. It is a TSQLDataDriverEh, that have properties to keep four SQL expressions and parameters to: query data, delete record, insert record, update record and requery one record. TSQLDataDriverEh can not interact with server by itself, but can prepare parameters for request and call global event to transfer SQL expression on processing in application. There are several components that inherited from TSQLDataDriverEh, which can send SQL expressions on the server through the corresponding access engine. It is a TBDEDataDriverEh, TIBXDataDriverEh, TDBXDataDriverEh and TADODataDriverEh components.
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