Hibernate Named Query

Hibernate Named Queries are created via class-level annotations on entities; normally, the queries apply to the entity in whose source file they occur, but there’s no absolute requirement for this to be true.

Named queries are created with the @NamedQueries annotation, which contains an array of @NamedQuery sets; each has a query and a name.

Example :

@Entity
@Table(name = "Employee")
@NamedQueries({
        @NamedQuery(name = "Employee.findAll", query = "from Employee emp"),
        @NamedQuery(name = "Employee.findByName",
                query = "from Employee emp where emp.firstName=:firstName"),
})
public class Employee implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id")
    private int id;

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

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

    @Column(name = "address")
    private String address;

// getters & setters & toString()
// ...
}

Executing above named query  :

Query namedQuery = session.getNamedQuery("Employee.findAll");
List<Employee> employees = namedQuery.list();
employees.forEach(System.out::println);  

Summary

In this tutorial, we learnt about what is hibernate named query and understood by seeing an example of how to declare a named query.
I hope you liked it !

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