What is generally placed in dao packages in java

The DAO package in Java encapsulates database interaction logic and is used to perform CRUD operations, complex queries, and database transactions. These benefits include reducing code complexity, improving maintainability and testability, making it easy to update and verify interactions with the database.

Purpose of DAO package in Java

In Java, DAO (Data Access Object) package usually contains Class that performs database operations. The DAO class encapsulates the logic for interacting with the database, allowing applications to access and manipulate data stored in the database.

Typical uses of the DAO package include:

• Perform CRUD (create, read, update, delete) operations: These operations Enables applications to create, retrieve, update, and delete records in the database.
• Execute complex queries: DAO classes can perform complex queries using SQL statements or JPA queries to retrieve specific data.
• Handling database transactions: DAO class can ensure data consistency and integrity by managing database transactions.

The structure of DAO packages

DAO packages are usually organized by function, with each class corresponding to a specific entity or operation. For example, a DAO package might contain the following classes:

• CustomerDAO: is used to perform customer-related operations (e.g. create, read, update, delete).
• OrderDAO: Used to perform order-related operations (such as creation, acquisition, cancellation).
• ProductDAO: Used to perform product-related operations (e.g. get, update, search).

Benefits of using the DAO package

The benefits of using the DAO package include:

• Reduce code complexity: Encapsulating database access logic in a DAO class can simplify the application code and isolate it from the database implementation.
• Improve maintainability: By using DAO classes as the interface between the application and the database, the database implementation can be easily updated or modified without changing the application code.
• Improve testability: DAO classes can be unit tested to verify the correctness of database operations, thereby improving the overall reliability of the application.

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