Description: Install database operation, the purpose is to hide within the class of java.sql package in the code to remove the core database operations in code. In this way, can not meet the large amount of data query, but if we really encounter a large amount of data query, what package it is not good, still have direct database operations. Package database operations, the purpose is to hide the java.sql package the class, the code in the code to remove the core database operations. To put an end to direct the resources of the database is not easy to bring the issue of release. Also reduce the amount of database operations coding. But many users in the package, but like to return a result set (ResultSet object), then this package does not make sense.
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