Manual Custom Queries in spring boot

To perform manual custom queries in Spring Boot, follow these steps:

1. Define a Repository Interface: Create an interface that extends the JpaRepository or CrudRepository interface and use the @Repository annotation.

2. Define Custom Query Methods: Declare methods in the repository interface using the @Query annotation and provide the JPQL (Java Persistence Query Language) or native SQL query.

3. Implement the Query: Use the defined custom query methods in your service or controller classes to interact with the database.

4. Execute the Query: Call the custom query methods and handle the results as needed in your application logic.

5. Test the Queries: Write unit tests to ensure the correctness and performance of the custom queries.

By following these steps, you can effectively utilize manual custom queries in Spring Boot for interacting with the database.