What is the main idea behind Spring Data?

The main idea of Spring Data is to simplify working with databases and other data stores by providing a high-level abstract layer for data access.

Spring Data allows developers to create repositories (interfaces) for data operations without having to write a lot of boilerplate code for CRUD operations. The framework automatically implements these methods based on naming conventions and annotations.

This speeds up development, improves code readability and maintainability, and also ensures integration with various data sources (SQL, NoSQL, search engines, etc.).

Example of a repository interface:

public interface UserRepository extends JpaRepository<User, Long> {
    List<User> findByLastName(String lastName);
}

Spring Data automatically implements the findByLastName method, enabling quick queries without writing SQL.