Data access object layer (DAO) code example using JDBC

Java is an object-oriented language. When operating data, developers are usually more used to facing a specific type of object. For example, a user is an object of user class. What the Dao layer needs to do is to provide sufficient object support for the upper layer, so that the upper layer can no longer see specific data, but live objects.

Add, delete, query and modify operations are the four basic operations that Dao needs to do. The query generally needs to provide traversal query and ID query. For traversal query, Dao needs to provide user generic list object, and for ID query, it needs to provide user object with assembled data. As for addition and modification operations, the upper layer generally provides a user object, and Dao inserts the data in the user object into the table using insert statement. To delete, you only need to provide an ID

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