What are the functions of the JPA framework?

The main functionalities of the JPA framework include:

1. Object-Relational Mapping (ORM): The JPA framework can map Java objects to database tables, enabling data conversion between objects and relational databases.
2. CRUD operations: The JPA framework assists developers in performing common database operations such as adding, deleting, updating, and retrieving data.
3. Query Language: The JPA framework offers query languages such as JPQL (Java Persistence Query Language) which makes it easier to perform complex database queries.
4. Transaction management: The JPA framework offers transaction management functionality to ensure the consistency and integrity of database operations.
5. Cache management: JPA framework supports caching for entity objects, which can improve system performance.
6. Lazy loading: The JPA framework supports a lazy loading mechanism, which can delay the loading of associated objects, reducing data transmission.
7. Related mapping: JPA framework supports various types of association mappings, such as one-to-one, one-to-many, many-to-one, many-to-many, etc.

Overall, the main purpose of the JPA framework is to simplify the complexity of database operations for developers, improve development efficiency, and enhance code quality.