dao What is java?
DAO is the Data Access Object data access interface.
Data access: As the name suggests, it means dealing with the database. Sandwiched between business logic and database resources. The DAO pattern is introduced in the core J2EE pattern as follows: In order to build a robust J2EE application, all access operations to the data source should be abstractly encapsulated in a public API.
#In programming language, it is to establish an interface, which defines all transaction methods that will be used in this application. In this application, this interface is used when interacting with the data source, and a separate class is written to implement this interface and logically correspond to this specific data storage.
Extended information:
This is the mvc architecture of java. It is just like the scene in the workshop in a factory. Each department is responsible for different processes and work. Dao (data access object) is mainly responsible for Code that handles database operations, such as adding, deleting, modifying, and querying data in the database.
General operations The steps for modifying, adding, and deleting database operations are very similar. I wrote a public DAO class. When modifying, adding, or deleting database operations, the public DAO class is directly called.
The DAO model achieves the following goals by providing a data abstraction layer interface to the business layer:
1. Separation of data storage logic.
2. Separation of underlying implementation of data access.
3. Separation of resource management and scheduling.
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