Merge pull request #10494 from abdallahsawan/BAEL-4121
Usage of the Hibernate @LazyCollection Annotation Article by Abdallah…
This commit is contained in:
Eric Martin
GitHub
commit
8c00c69fde
|
|
@ -0,0 +1,103 @@
|
|||
package com.baeldung.hibernate.lazycollection.model;
|
||||
|
||||
import org.hibernate.annotations.LazyCollection;
|
||||
import org.hibernate.annotations.LazyCollectionOption;
|
||||
|
||||
import javax.persistence.GeneratedValue;
|
||||
import javax.persistence.GenerationType;
|
||||
import javax.persistence.Id;
|
||||
import javax.persistence.OrderColumn;
|
||||
import javax.persistence.OneToMany;
|
||||
import javax.persistence.Entity;
|
||||
import java.util.ArrayList;
|
||||
import java.util.List;
|
||||
|
||||
@Entity
|
||||
public class Branch {
|
||||
|
||||
@Id
|
||||
@GeneratedValue(strategy = GenerationType.IDENTITY)
|
||||
private Long id;
|
||||
|
||||
private String name;
|
||||
|
||||
public Branch() {
|
||||
}
|
||||
public Branch(String name) {
|
||||
this.name = name;
|
||||
}
|
||||
|
||||
@OneToMany(mappedBy = "mainBranch")
|
||||
@LazyCollection(LazyCollectionOption.TRUE)
|
||||
private List<Employee> mainEmployees;
|
||||
|
||||
@OneToMany(mappedBy = "subBranch")
|
||||
@LazyCollection(LazyCollectionOption.FALSE)
|
||||
private List<Employee> subEmployees;
|
||||
|
||||
@OneToMany(mappedBy = "additionalBranch")
|
||||
@LazyCollection(LazyCollectionOption.EXTRA)
|
||||
@OrderColumn(name = "order_id")
|
||||
private List<Employee> additionalEmployees;
|
||||
|
||||
public Long getId() {
|
||||
return id;
|
||||
}
|
||||
|
||||
public void setId(Long id) {
|
||||
this.id = id;
|
||||
}
|
||||
|
||||
public String getName() {
|
||||
return name;
|
||||
}
|
||||
|
||||
public void setName(String name) {
|
||||
this.name = name;
|
||||
}
|
||||
|
||||
public List<Employee> getMainEmployees() {
|
||||
return mainEmployees;
|
||||
}
|
||||
|
||||
public void setMainEmployees(List<Employee> mainEmployees) {
|
||||
this.mainEmployees = mainEmployees;
|
||||
}
|
||||
|
||||
public List<Employee> getSubEmployees() {
|
||||
return subEmployees;
|
||||
}
|
||||
|
||||
public void setSubEmployees(List<Employee> subEmployees) {
|
||||
this.subEmployees = subEmployees;
|
||||
}
|
||||
|
||||
public List<Employee> getAdditionalEmployees() {
|
||||
return additionalEmployees;
|
||||
}
|
||||
|
||||
public void setAdditionalEmployees(List<Employee> additionalEmployees) {
|
||||
this.additionalEmployees = additionalEmployees;
|
||||
}
|
||||
|
||||
public void addMainEmployee(Employee employee) {
|
||||
if (this.mainEmployees == null) {
|
||||
this.mainEmployees = new ArrayList<>();
|
||||
}
|
||||
this.mainEmployees.add(employee);
|
||||
}
|
||||
|
||||
public void addSubEmployee(Employee employee) {
|
||||
if (this.subEmployees == null) {
|
||||
this.subEmployees = new ArrayList<>();
|
||||
}
|
||||
this.subEmployees.add(employee);
|
||||
}
|
||||
|
||||
public void addAdditionalEmployee(Employee employee) {
|
||||
if (this.additionalEmployees == null) {
|
||||
this.additionalEmployees = new ArrayList<>();
|
||||
}
|
||||
this.additionalEmployees.add(employee);
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,88 @@
|
|||
package com.baeldung.hibernate.lazycollection.model;
|
||||
|
||||
import javax.persistence.GeneratedValue;
|
||||
import javax.persistence.GenerationType;
|
||||
import javax.persistence.Id;
|
||||
import javax.persistence.OrderColumn;
|
||||
import javax.persistence.ManyToOne;
|
||||
import javax.persistence.Entity;
|
||||
|
||||
@Entity
|
||||
public class Employee {
|
||||
|
||||
@Id
|
||||
@GeneratedValue(strategy = GenerationType.IDENTITY)
|
||||
private Long id;
|
||||
|
||||
private String name;
|
||||
|
||||
private String address;
|
||||
|
||||
public Employee() {
|
||||
|
||||
}
|
||||
|
||||
public Employee(String name, Branch mainBranch, Branch subBranch, Branch additionalBranch) {
|
||||
this.name = name;
|
||||
this.mainBranch = mainBranch;
|
||||
this.subBranch = subBranch;
|
||||
this.additionalBranch = additionalBranch;
|
||||
}
|
||||
|
||||
@ManyToOne
|
||||
private Branch mainBranch;
|
||||
|
||||
@ManyToOne
|
||||
private Branch subBranch;
|
||||
|
||||
@ManyToOne
|
||||
private Branch additionalBranch;
|
||||
|
||||
public Long getId() {
|
||||
return id;
|
||||
}
|
||||
|
||||
public void setId(Long id) {
|
||||
this.id = id;
|
||||
}
|
||||
|
||||
public String getName() {
|
||||
return name;
|
||||
}
|
||||
|
||||
public void setName(String name) {
|
||||
this.name = name;
|
||||
}
|
||||
|
||||
public String getAddress() {
|
||||
return address;
|
||||
}
|
||||
|
||||
public void setAddress(String address) {
|
||||
this.address = address;
|
||||
}
|
||||
|
||||
public Branch getMainBranch() {
|
||||
return mainBranch;
|
||||
}
|
||||
|
||||
public void setMainBranch(Branch mainBranch) {
|
||||
this.mainBranch = mainBranch;
|
||||
}
|
||||
|
||||
public Branch getSubBranch() {
|
||||
return subBranch;
|
||||
}
|
||||
|
||||
public void setSubBranch(Branch subBranch) {
|
||||
this.subBranch = subBranch;
|
||||
}
|
||||
|
||||
public Branch getAdditionalBranch() {
|
||||
return additionalBranch;
|
||||
}
|
||||
|
||||
public void setAdditionalBranch(Branch additionalBranch) {
|
||||
this.additionalBranch = additionalBranch;
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,110 @@
|
|||
package com.baeldung.hibernate.lazycollection;
|
||||
|
||||
import com.baeldung.hibernate.lazycollection.model.Branch;
|
||||
import com.baeldung.hibernate.lazycollection.model.Employee;
|
||||
import org.hibernate.Hibernate;
|
||||
import org.hibernate.Session;
|
||||
import org.hibernate.SessionFactory;
|
||||
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
|
||||
import org.hibernate.cfg.Configuration;
|
||||
import org.hibernate.dialect.H2Dialect;
|
||||
import org.hibernate.service.ServiceRegistry;
|
||||
|
||||
import org.junit.After;
|
||||
import org.junit.AfterClass;
|
||||
import org.junit.Assert;
|
||||
import org.junit.Before;
|
||||
import org.junit.BeforeClass;
|
||||
import org.junit.Test;
|
||||
|
||||
import javax.annotation.PostConstruct;
|
||||
|
||||
public class LazyCollectionIntegrationTest {
|
||||
|
||||
private static SessionFactory sessionFactory;
|
||||
|
||||
private Session session;
|
||||
|
||||
Branch branch;
|
||||
|
||||
@BeforeClass
|
||||
public static void beforeTests() {
|
||||
Configuration configuration = new Configuration().addAnnotatedClass(Branch.class)
|
||||
.addAnnotatedClass(Employee.class).setProperty("hibernate.dialect", H2Dialect.class.getName())
|
||||
.setProperty("hibernate.connection.driver_class", org.h2.Driver.class.getName())
|
||||
.setProperty("hibernate.connection.url", "jdbc:h2:mem:test")
|
||||
.setProperty("hibernate.connection.username", "sa").setProperty("hibernate.connection.password", "")
|
||||
.setProperty("hibernate.hbm2ddl.auto", "update");
|
||||
|
||||
ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder()
|
||||
.applySettings(configuration.getProperties()).build();
|
||||
|
||||
sessionFactory = configuration.buildSessionFactory(serviceRegistry);
|
||||
|
||||
}
|
||||
|
||||
@Before
|
||||
public void setUp() {
|
||||
session = sessionFactory.openSession();
|
||||
session.beginTransaction();
|
||||
|
||||
branch = new Branch("Main Branch");
|
||||
|
||||
session.save(branch);
|
||||
|
||||
Employee mainEmployee1 = new Employee("main employee 1", branch, null, null);
|
||||
Employee mainEmployee2 = new Employee("main employee 2", branch, null, null);
|
||||
Employee mainEmployee3 = new Employee("main employee 3", branch, null, null);
|
||||
|
||||
session.save(mainEmployee1);
|
||||
session.save(mainEmployee2);
|
||||
session.save(mainEmployee3);
|
||||
|
||||
Employee subEmployee1 = new Employee("sub employee 1", null, branch, null);
|
||||
Employee subEmployee2 = new Employee("sub employee 2", null, branch, null);
|
||||
Employee subEmployee3 = new Employee("sub employee 3", null, branch, null);
|
||||
|
||||
session.save(subEmployee1);
|
||||
session.save(subEmployee2);
|
||||
session.save(subEmployee3);
|
||||
|
||||
Employee additionalEmployee1 = new Employee("additional employee 1", null, null, branch);
|
||||
Employee additionalEmployee2 = new Employee("additional employee 2", null, null, branch);
|
||||
Employee additionalEmployee3 = new Employee("additional employee 3", null, null, branch);
|
||||
|
||||
session.save(additionalEmployee1);
|
||||
session.save(additionalEmployee2);
|
||||
session.save(additionalEmployee3);
|
||||
|
||||
session.flush();
|
||||
session.refresh(branch);
|
||||
session.getTransaction().commit();
|
||||
session.close();
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testLazyFetching() {
|
||||
Assert.assertFalse(Hibernate.isInitialized(branch.getMainEmployees()));
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testEagerFetching() {
|
||||
Assert.assertTrue(Hibernate.isInitialized(branch.getSubEmployees()));
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testExtraFetching() {
|
||||
Assert.assertFalse(Hibernate.isInitialized(branch.getAdditionalEmployees()));
|
||||
}
|
||||
|
||||
@After
|
||||
public void tearDown() {
|
||||
session.getTransaction().commit();
|
||||
session.close();
|
||||
}
|
||||
|
||||
@AfterClass
|
||||
public static void afterTests() {
|
||||
sessionFactory.close();
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue