LibraryManageSystem overall design specification LibraryManageSystem uses three layers of Architecture: data access (Data acess) layer, business (business) layer, view (View) layer. Data access layer: using JDBC to access the database, and the JDBC is simply encapsulated, using Template mothod mode and callback interface greatly reduces the low-level operation of jdbc. The JdbcTemplate class provides access to the database using JDBC template provides queryForObject and queryForList to get to the object query and object aggregation respectively, execute method to update, insert, delete operation. Provides a RowCallBackHandler interface, can be realized through the interface to provide a callback processing of the query line, use the PreparedStatementCallBack callback interface, to provide for the parameters of PreparedStatement, provides the ORMaping interface, you can easily achieve the mapping

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