Step 7 – O/R mapping integration

The Spring Framework’s O/R Mapping Integration module provides support for integrating object-relational mapping (ORM) frameworks with Spring applications. ORM frameworks are tools that allow developers to work with databases using object-oriented programming techniques instead of traditional SQL statements.

One popular ORM framework is Hibernate, which allows you to map your Java classes to database tables and perform CRUD (Create, Read, Update, Delete) operations on those tables using Java code.

With the Spring O/R Mapping Integration module, you can use Hibernate (as well as other ORM frameworks like JPA and MyBatis) within your Spring application. This integration provides a number of benefits, such as:

  • Simplifying configuration: You can configure your ORM framework within your Spring application context, which can make it easier to manage your application’s configuration.
  • Providing transaction management: Spring can manage transactions for your ORM framework, ensuring that your data is consistent and accurate even in the face of errors or exceptions.
  • Allowing for dependency injection: You can use Spring’s dependency injection capabilities to inject your ORM framework objects into your application’s components.

Here’s an example of how you might use the Spring O/R Mapping Integration module with hibernate-

@Table(name = "customers")
public class Customer {

  @GeneratedValue(strategy = GenerationType.IDENTITY)
  private Long id;

  @Column(name = "first_name")
  private String firstName;

  @Column(name = "last_name")
  private String lastName;

  // getters and setters

public class CustomerRepositoryImpl implements CustomerRepository {

  private SessionFactory sessionFactory;

  public List<Customer> findAll() {
    try (Session session = sessionFactory.openSession()) {
      CriteriaBuilder cb = session.getCriteriaBuilder();
      CriteriaQuery<Customer> cq = cb.createQuery(Customer.class);
      Root<Customer> root = cq.from(Customer.class);;
      Query<Customer> query = session.createQuery(cq);
      return query.getResultList();

  // other CRUD methods

Overall, the Spring O/R Mapping Integration module provides a convenient way to use ORM frameworks like Hibernate within Spring applications, allowing you to take advantage of both Spring’s and the ORM framework’s features.


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