@Entity
@Table(name = "employee")
public class Employee {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(name = "name")
private String name;
}
public interface EmployeeDAO {
void save(Employee employee);
Employee findById(Long id);
List<Employee> findAll();
}
public class EmployeeDAOImpl implements EmployeeDAO {
@PersistenceContext
private EntityManager entityManager;
@Override
public void save(Employee employee) {
entityManager.persist(employee);
}
@Override
public Employee findById(Long id) {
return entityManager.find(Employee.class, id);
}
@Override
public List<Employee> findAll() {
TypedQuery<Employee> query = entityManager.createQuery("SELECT e FROM Employee e", Employee.class);
return query.getResultList();
}
}
<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
http://xmlns.jcp.org/xml/ns/persistence/persistence_2_2.xsd"
version="2.2">
<persistence-unit name="my-persistence-unit" transaction-type="JTA">
<jta-data-source>jdbc/my-datasource</jta-data-source>
</persistence-unit>
</persistence>
<filter>
<filter-name>entityManagerFilter</filter-name>
<filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>entityManagerFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
