What is the dao layer in java for?

The role of DAO layer in Java

The DAO (Data Access Object) layer is a layer in object-oriented programming used to abstract data access logic. It is responsible for interacting with the database and managing persistence-related tasks.

The role of the DAO layer

• Encapsulates the database access code:The DAO layer encapsulates the interaction with the database so that it can interact with the business Logic is separated from other application components.
• Provide a unified data access interface: It provides a standardized set of methods to access and operate the database, simplifying how applications interact with the database.
• Ensure data integrity and consistency: The DAO layer ensures the integrity and consistency of data operations by using transactions and other technologies.
• Simplified application maintenance: By separating data access code from business logic, the DAO layer makes applications easier to maintain and change.

The structure of the DAO layer

A typical DAO layer consists of the following components:

• DAO interface:Define the standardized interface for data access operations.
• DAO implementation: Implement the DAO interface and actually interact with the database.

Advantages of the DAO layer

Using the DAO layer can bring the following advantages:

• Improve code reusability Performance: The data access code is encapsulated in the DAO layer and can be reused by multiple components of the application.
• Improve scalability: By separating data access logic from business logic, the DAO layer can be expanded more easily to support new data sources and functionality.
• Improve application performance: By using techniques such as caching and batching, the DAO layer can optimize data access to improve application performance.

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