Code related to the mini-article BAEL-3386
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zepfred
parent
1c3f2d68dd
commit
195ab64929
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package com.baeldung.elementcollection;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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@SpringBootApplication
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public class ElementCollectionApplication {
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public static void main(String[] args) {
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SpringApplication.run(ElementCollectionApplication.class, args);
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}
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}
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package com.baeldung.elementcollection.model;
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import javax.persistence.*;
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import java.util.List;
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import java.util.Objects;
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@Entity
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public class Employee {
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@Id
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private int id;
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private String name;
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@ElementCollection
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@CollectionTable(
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name = "employee_phone",
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joinColumns = @JoinColumn(name = "employee_id")
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)
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private List<Phone> phones;
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public Employee() {
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}
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public Employee(int id) {
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this.id = id;
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}
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public Employee(int id, String name) {
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this.id = id;
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this.name = name;
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}
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public int getId() {
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return id;
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}
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public void setId(int id) {
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this.id = id;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public List<Phone> getPhones() {
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return phones;
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}
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public void setPhones(List<Phone> phones) {
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this.phones = phones;
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}
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@Override
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public boolean equals(Object o) {
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if (this == o) {
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return true;
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}
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if (!(o instanceof Employee)) {
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return false;
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}
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Employee user = (Employee) o;
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return getId() == user.getId();
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}
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@Override
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public int hashCode() {
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return Objects.hash(getId());
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}
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}
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package com.baeldung.elementcollection.model;
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import javax.persistence.Embeddable;
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import java.util.Objects;
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@Embeddable
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public class Phone {
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private String type;
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private String areaCode;
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private String number;
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public Phone() {
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}
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public Phone(String type, String areaCode, String number) {
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this.type = type;
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this.areaCode = areaCode;
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this.number = number;
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}
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public String getType() {
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return type;
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}
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public void setType(String type) {
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this.type = type;
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}
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public String getAreaCode() {
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return areaCode;
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}
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public void setAreaCode(String areaCode) {
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this.areaCode = areaCode;
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}
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public String getNumber() {
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return number;
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}
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public void setNumber(String number) {
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this.number = number;
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}
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@Override
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public boolean equals(Object o) {
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if (this == o) {
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return true;
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}
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if (!(o instanceof Phone)) {
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return false;
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}
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Phone phone = (Phone) o;
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return getType().equals(phone.getType()) &&
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getAreaCode().equals(phone.getAreaCode()) &&
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getNumber().equals(phone.getNumber());
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}
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@Override
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public int hashCode() {
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return Objects.hash(getType(), getAreaCode(), getNumber());
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}
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}
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package com.baeldung.elementcollection.repository;
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import com.baeldung.elementcollection.model.Employee;
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import org.springframework.stereotype.Repository;
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import org.springframework.transaction.annotation.Transactional;
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import javax.persistence.EntityGraph;
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import javax.persistence.EntityManager;
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import javax.persistence.PersistenceContext;
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import java.util.HashMap;
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import java.util.Map;
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@Repository
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public class EmployeeRepository {
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@PersistenceContext
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private EntityManager em;
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@Transactional
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public void save(Employee employee) {
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em.persist(employee);
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}
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@Transactional
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public void remove(int id) {
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Employee employee = findById(id);
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em.remove(employee);
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}
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public Employee findById(int id) {
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return em.find(Employee.class, id);
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}
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public Employee findByJPQL(int id) {
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return em.createQuery("SELECT u FROM Employee AS u JOIN FETCH u.phones WHERE u.id=:id", Employee.class).setParameter("id", id).getSingleResult();
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}
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public Employee findByEntityGraph(int id) {
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EntityGraph<Employee> entityGraph = em.createEntityGraph(Employee.class);
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entityGraph.addAttributeNodes("name", "phones");
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Map<String, Object> properties = new HashMap<>();
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properties.put("javax.persistence.fetchgraph", entityGraph);
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return em.find(Employee.class, id, properties);
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}
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}
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@ -0,0 +1,63 @@
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package com.baeldung.elementcollection;
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import com.baeldung.elementcollection.model.Employee;
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import com.baeldung.elementcollection.model.Phone;
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import com.baeldung.elementcollection.repository.EmployeeRepository;
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import org.junit.After;
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import org.junit.Before;
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import org.junit.Test;
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import org.junit.runner.RunWith;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.boot.test.context.SpringBootTest;
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import org.springframework.test.context.junit4.SpringRunner;
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import org.springframework.transaction.annotation.Transactional;
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import java.util.Arrays;
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import static org.hamcrest.core.Is.is;
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import static org.junit.Assert.assertThat;
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@RunWith(SpringRunner.class)
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@SpringBootTest(classes = ElementCollectionApplication.class)
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public class ElementCollectionIntegrationTest {
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@Autowired
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private EmployeeRepository employeeRepository;
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@Before
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public void init() {
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Employee employee = new Employee(1, "Fred");
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employee.setPhones(Arrays.asList(new Phone("work", "+55", "99999-9999"), new Phone("home", "+55", "98888-8888")));
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employeeRepository.save(employee);
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}
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@After
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public void clean() {
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employeeRepository.remove(1);
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}
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@Test(expected = org.hibernate.LazyInitializationException.class)
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public void whenAccessLazyCollection_thenThrowLazyInitializationException() {
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Employee employee = employeeRepository.findById(1);
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assertThat(employee.getPhones().size(), is(2));
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}
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@Test
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public void whenUseJPAQL_thenFetchResult() {
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Employee employee = employeeRepository.findByJPQL(1);
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assertThat(employee.getPhones().size(), is(2));
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}
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@Test
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public void whenUseEntityGraph_thenFetchResult() {
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Employee employee = employeeRepository.findByEntityGraph(1);
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assertThat(employee.getPhones().size(), is(2));
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}
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@Test
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@Transactional
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public void whenUseTransaction_thenFetchResult() {
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Employee employee = employeeRepository.findById(1);
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assertThat(employee.getPhones().size(), is(2));
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}
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}
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