To trigger and retrieve the modified value when inserting, updating, or deleting an entity in a table using the repository method or Entity Manager, you can follow these steps:
For example, if you have an entity class called User with a last modified field, you can create a UserRepository interface that extends JpaRepository<user, long=""> and implement it as follows:
@Repository
public interface UserRepository extends JpaRepository<User, Long> {
@Override
@Transactional
@PrePersist
@PreUpdate
<S extends User> S save(S entity);
@Override
@Transactional
<S extends User> List<S> saveAll(Iterable<S> entities);
@Override
@Transactional
void delete(User entity);
@Override
@Transactional
void deleteAll(Iterable<? extends User> entities);
}
Then, in your code, you can use the repository to save or update a user entity as follows:
User user = new User("John", "Doe");
userRepository.save(user);
// Modify the user entity
user.setFirstName("Jane");
userRepository.save(user);
// Retrieve the modified user entity
User modifiedUser = userRepository.findById(user.getId()).orElse(null);
The modifiedUser object will have the updated values of the user entity, including the last modified timestamp.
Asked: 2023-07-10 16:36:06 +0000
Seen: 14 times
Last updated: Jul 10 '23