Adding custom functionality to all repositories

Sometimes we have to add custom functionality to all repositories. In this section, we will learn how we can do this and create a custom repository method that is used to delete an entity by using its ID.

We can add custom functionality to all repositories by following these steps:

1. Create a base interface that declares the custom methods.

2. Implement the created interface.

3. Create a repository factory bean.

4. Configure Spring Data JPA to use our repository factory bean.

5. Create a repository interface.

6. Implement a service class that uses the custom functionality.

Creating the base repository interface

We start by creating a base repository interface that declares the methods that are available in the actual repositories. We can do this by:

1. Creating an interface that takes the type of the managed entity and the type of its ID as a type parameter.

2. Extending both the JpaRepository<T, ID> and QueryDslPredicateExecutor<T> interfaces in our base repository...