Spring Boot @Transactional

The @Transactional annotation is a powerful feature of Spring Boot that simplifies the management of database transactions. It allows developers to define transactional boundaries around methods or entire classes, ensuring that data integrity is maintained during database operations. In this blog post, we will discuss the @Transactional annotation and its usage in Spring Boot.

What is @Transactional Annotation?
The @Transactional annotation is used to define the scope of a transaction in Spring Boot applications. This annotation can be applied to a method, a class, or even an interface. When this annotation is used, Spring Boot will automatically manage the transaction lifecycle, including the beginning and ending of the transaction, and the rollback if an exception occurs.

Usage of @Transactional Annotation:
Here are some use cases of the @Transactional annotation in Spring Boot:

Single-transaction Method:
You can use @Transactional annotation to wrap a single method in a transactional boundary. This is useful when you want to ensure that a specific operation is atomic and fails entirely or succeeds entirely. Here is an example:

@Transactional
public void saveUser(User user) {
    userRepository.save(user);
}

Multiple-transaction Method:
If a method calls multiple methods, and each method should be transactional, you can use the @Transactional annotation on the parent method to ensure that all the child methods are included in the same transaction. Here is an example:

@Transactional
public void saveUserAndOrders(User user, List<Order> orders) {
    userRepository.save(user);
    for(Order order : orders) {
        orderRepository.save(order);
    }
}

Transactional Class:
You can use the @Transactional annotation on a class to ensure that all methods within the class are transactional. This is useful when you have a group of related methods that require the same transactional behavior. Here is an example:

@Transactional
public class OrderService {
    public void save(Order order) {
        orderRepository.save(order);
    }
    public void delete(Order order) {
        orderRepository.delete(order);
    }
}

Conclusion:
In conclusion, the @Transactional annotation is an essential feature of Spring Boot that simplifies the management of database transactions. It allows developers to define transactional boundaries around methods or entire classes, ensuring that data integrity is maintained during database operations. By using the @Transactional annotation, developers can write more robust and reliable code.