The DAO design pattern
The DAO design pattern can be used to provide a separation between the low-level data accessing operations and the high-level business services, as shown here:
The DAO layer
In between the database and the business layer, there is a layer called the DAO layer. The DAO layer is mainly used to perform the Create-Retrieve-Update-Delete (CRUD) operation. The DAO layer is responsible for creating, obtaining, updating, or deleting records in the database table. To perform this CRUD operation, DAO uses a low-level API, such as the JDBC API or the Hibernate API. This DAO layer will have a method for performing the CRUD operation. It ...
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