/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
package org.hibernate.userguide.fetching;
import java.util.ArrayList;
import java.util.List;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import org.hibernate.annotations.Fetch;
import org.hibernate.annotations.FetchMode;
import org.hibernate.annotations.NaturalId;
import org.hibernate.jpa.test.BaseEntityManagerFunctionalTestCase;
import org.junit.Test;
import org.jboss.logging.Logger;
import static org.hibernate.testing.transaction.TransactionUtil.doInJPA;
import static org.junit.Assert.assertEquals;
/**
* @author Vlad Mihalcea
*/
public class FetchModeJoinTest extends BaseEntityManagerFunctionalTestCase {
private static final Logger log = Logger.getLogger( FetchModeJoinTest.class );
@Override
protected Class<?>[] getAnnotatedClasses() {
return new Class<?>[] {
Department.class,
Employee.class,
};
}
@Test
public void test() {
doInJPA( this::entityManagerFactory, entityManager -> {
for ( long i = 0; i < 2; i++ ) {
Department department = new Department();
department.id = i + 1;
entityManager.persist( department );
for ( long j = 0; j < 3; j++ ) {
Employee employee1 = new Employee();
employee1.username = String.format( "user %d_%d", i, j );
employee1.department = department;
entityManager.persist( employee1 );
}
}
} );
doInJPA( this::entityManagerFactory, entityManager -> {
//tag::fetching-strategies-fetch-mode-join-example[]
Department department = entityManager.find( Department.class, 1L );
log.infof( "Fetched department: %s", department.getId());
assertEquals( 3, department.getEmployees().size() );
//end::fetching-strategies-fetch-mode-join-example[]
} );
}
@Entity(name = "Department")
public static class Department {
@Id
private Long id;
//tag::fetching-strategies-fetch-mode-join-mapping-example[]
@OneToMany(mappedBy = "department")
@Fetch(FetchMode.JOIN)
private List<Employee> employees = new ArrayList<>();
//end::fetching-strategies-fetch-mode-join-mapping-example[]
//Getters and setters omitted for brevity
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public List<Employee> getEmployees() {
return employees;
}
public void setEmployees(List<Employee> employees) {
this.employees = employees;
}
}
@Entity(name = "Employee")
public static class Employee {
@Id
@GeneratedValue
private Long id;
@NaturalId
private String username;
@ManyToOne(fetch = FetchType.LAZY)
private Department department;
//Getters and setters omitted for brevity
}
}