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Abstract: Repository Factory is a development guide Package released by the Microsoft mode and practice team. It separates the data access guidance package integrated by the web service software factory (wssf, A separate development guide package is formed. Reference Johnny halife: "It is not an object-relational mapping (ORM) tool. It is designed as a lightweight CodeGenerator to automatically generate a vast majority of Domain Model objects and per

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However, Microsoft SQL Server has an important flaw in processing such indexes, which is to index the operations that should be compiled into the index seek, which can cause severe performance degradation Let me give you an example to illustrate the problem. Assuming that a table T has an index (Cityid, Sentdate, UserID), and now has a paging list feature, to obtain a query that is larger than a number of records in a multiple-column composite index