Description: Data access in the entire software development framework is a three-tier data layer, the other is a two-tier basis. Without it, the data storage change meaningless. Meanwhile, the efficiency of data access will directly affect the quality of the software. A slow data access system is the customer can not be tolerated. A good system will be an efficient data access methods. This shows that access to data in the software development process is very important. If reunification of data access methods, all aspects of the data access problems can be resolved. My system will be open to all sources of data, or even the future there will be data sources. To achieve the expected results of SQLServer, ODBC, OLEDB data sources and the industrial Citect, Ifix monitoring software data sources unified a
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