examples of declarative and programmatic transaction management in Spring Boot:

Category : Spring Boot | Sub Category : Spring Boot | By Prasad Bonam Last updated: 2023-07-17 06:43:22 Viewed : 821

Examples of declarative and programmatic transaction management in Spring Boot:

Certainly! Here are examples of declarative and programmatic transaction management in Spring Boot:

1. Declarative Transaction Management (using @Transactional):

javaCopy code
@Service
public class UserService {

    @Autowired
    private UserRepository userRepository;

    @Transactional
    public void createUser(User user) {
        // Perform some business logic
        userRepository.save(user);
    }

    @Transactional(propagation = Propagation.REQUIRED, readOnly = true)
    public User getUserById(Long userId) {
        // Perform some business logic
        return userRepository.findById(userId).orElse(null);
    }
}

In this example, the createUser and getUserById methods of the UserService class are annotated with @Transactional. The transactional behavior is defined by the presence of these annotations. The createUser method starts a transaction, and if an exception occurs, the transaction will be rolled back. The getUserById method is marked as read-only, indicating that it doesnt modify the data and can optimize the transaction accordingly.

2. Programmatic Transaction Management:

javaCopy code
@Service
public class UserService {

    @Autowired
    private UserRepository userRepository;

    @Autowired
    private PlatformTransactionManager transactionManager;

    public void createUser(User user) {
        TransactionDefinition transactionDefinition = new DefaultTransactionDefinition();
        TransactionStatus transactionStatus = transactionManager.getTransaction(transactionDefinition);

        try {
            // Perform some business logic
            userRepository.save(user);

            transactionManager.commit(transactionStatus);
        } catch (Exception e) {
            transactionManager.rollback(transactionStatus);
        }
    }

    public User getUserById(Long userId) {
        TransactionDefinition transactionDefinition = new DefaultTransactionDefinition();
        TransactionStatus transactionStatus = transactionManager.getTransaction(transactionDefinition);

        try {
            // Perform some business logic
            User user = userRepository.findById(userId).orElse(null);

            transactionManager.commit(transactionStatus);
            return user;
        } catch (Exception e) {
            transactionManager.rollback(transactionStatus);
            throw e;
        }
    }
}

In this example, the createUser and getUserById methods of the UserService class use programmatic transaction management. The PlatformTransactionManager is autowired into the class, and the methods explicitly manage the transactions using the transaction manager. The getTransaction method starts a transaction, and the commit method is called to commit the transaction. If an exception occurs, the rollback method is called to roll back the transaction.

These examples demonstrate the usage of both declarative and programmatic transaction management in Spring Boot. While declarative transaction management with @Transactional is more commonly used and recommended, programmatic transaction management provides fine-grained control over transaction handling when needed.