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VC database with ADO access to all Raiders1, ADO OverviewADO is Microsoft for the latest and most powerful data access paradigm designed OLE DB is an easy to use application layer interfaces. ADO allows you to write applications through OLE. DB provider to access and manipulate the data in the database server. ADO The main advantage is ease of use, speed, memory and disk less expenditure remains small. ADO in critical applications using the least network traffic, and front-end and data sources used the least number of layers, all of which are to provide a lightweight, high-performance interface. Is called ADO, is a familiar metaphor, OLE Automation interface.OLE DB is a set of Component Object Model (COM) interface, a new database low-level interface that encapsulates the ODBC functions, and in a uniform way to access information stored in different data sources. OLE DB is Microsoft UDA (Universal Data Access) technology base strategy. OLE DB data source provided for any high-performance access to these data sources including relational and non-relational databases, e-mail and file systems, text and graphics, custom business objects, and more. In other words, OLE DB is not limited to ISAM, Jet and even relational data source, it can handle any type of data, regardless of their format and storage methods. In practice, this diversity means to access resides in Excel spreadsheets, text files, e-mail / directory service or e-mail server, such as Microsoft Exchange in the data. However, OLE DB application programming interface is intended to provide the best variety of application functions, it does not meet the requirements of simplicity. You need to be an API to connect applications and OLE DB bridge, which is ActiveX Data Objects (ADO).Second, the use of VC ADO (developed as follows:)1, the introduction of ADO libraryUse ADO in the works before the stdafx.h header file # import symbols with the introduction of direct introduction of ADO libraries to enable t