Java 防止休眠在保存父对象时自动删除@Transient子对象
在SpringJPA中,我将一个childs列表声明为@Transient,我不想将其保留在parent中。问题是,当我保存其父项时,hibernate删除了child列表。例如:Java 防止休眠在保存父对象时自动删除@Transient子对象,java,hibernate,spring-data-jpa,hibernate-mapping,Java,Hibernate,Spring Data Jpa,Hibernate Mapping,在SpringJPA中,我将一个childs列表声明为@Transient,我不想将其保留在parent中。问题是,当我保存其父项时,hibernate删除了child列表。例如: @RunWith(SpringRunner.class) @DataJpaTest public class JPAUnitTest { @Autowired TutorialRepository repository; @Test public void paymentsShouldExistA
@RunWith(SpringRunner.class)
@DataJpaTest
public class JPAUnitTest {
@Autowired
TutorialRepository repository;
@Test
public void paymentsShouldExistAfterSaved() {
Tutorial tutorial = new Tutorial("Tut title", "Tut desc", true);
tutorial.addStudent(new Student("John"));
long id = repository.save(tutorial).getId();
Tutorial found = repository.findById(id).get();
org.junit.Assert.assertEquals("John", found.getStudents().get(0).getName());
found.getStudents().clear();
Student s = new Student("Kelly");
s.addPayment(100, LocalDate.of(2020, 11, 9));
s.addPayment(550, LocalDate.of(2020, 12, 18));
s.addPayment(80, LocalDate.of(2020, 12, 29));
found.addStudent(s);
org.junit.Assert.assertEquals(3, found.getStudents().get(0).getPayments().size());
repository.save(found);
org.junit.Assert.assertEquals("Kelly", found.getStudents().get(0).getName());
//Error - expected:3 but was:0
org.junit.Assert.assertEquals(3, found.getStudents().get(0).getPayments().size());
}
在上面的测试中,最后一个断言失败了,因为付款在测试结束后就消失了。付款对象为学生班级的子女:
@Entity
@Table(name = "payments")
public class Payment {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private long id;
@Column(name = "amount")
private double amount;
@Column(name = "payment_date")
private LocalDate date;
public Payment() {}
public Payment(double amount, LocalDate date) {
this.amount = amount;
this.date = date;
}
}
@Entity
@Table(name = "students")
public class Student {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private long id;
@Column(name = "name")
private String name;
@ManyToOne(fetch = FetchType.EAGER)
private Tutorial tutorial;
@Transient
private List<Payment> payments = new ArrayList<>();
public Student() {}
public Student(String name) {
this.name = name;
}
public String getName() {
return name;
}
public List<Payment> getPayments() {
return payments;
}
public void addPayment(double amount, LocalDate date) {
this.payments.add(new Payment(amount, date));
}
}
@Entity
@Table(name = "tutorials")
public class Tutorial {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private long id;
@Column(name = "title")
private String title;
@Column(name = "description")
private String description;
@Column(name = "published")
private boolean published;
@OneToMany(cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.EAGER, mappedBy = "tutorial")
private List<Student> students = new ArrayList<>();
public Tutorial() {}
public Tutorial(String title, String description, boolean published) {
this.title = title;
this.description = description;
this.published = published;
}
public void addStudent(Student student) {
this.students.add(student);
}
public List<Student> getStudents() {
return students;
}
public long getId() {
return id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public boolean isPublished() {
return published;
}
public void setPublished(boolean isPublished) {
this.published = isPublished;
}
}
@实体
@表(name=“付款”)
公共类支付{
@身份证
@GeneratedValue(策略=GenerationType.AUTO)
私人长id;
@列(name=“amount”)
私人双倍金额;
@列(name=“付款日期”)
私有本地日期;
公共支付(){}
公共支付(双倍金额,本地日期){
这个。金额=金额;
this.date=日期;
}
}
@实体
@表(name=“学生”)
公立班学生{
@身份证
@GeneratedValue(策略=GenerationType.AUTO)
私人长id;
@列(name=“name”)
私有字符串名称;
@manytone(fetch=FetchType.EAGER)
私人辅导;
@短暂的
私有列表付款=新建ArrayList();
公立学生(){}
公立学生(字符串名称){
this.name=名称;
}
公共字符串getName(){
返回名称;
}
公共列表getPayments(){
归还款项;
}
公共作废付款(双倍金额,本地日期){
此.payments.add(新付款(金额、日期));
}
}
@实体
@表(name=“教程”)
公开课辅导{
@身份证
@GeneratedValue(策略=GenerationType.AUTO)
私人长id;
@列(name=“title”)
私有字符串标题;
@列(name=“description”)
私有字符串描述;
@列(name=“published”)
私有布尔出版;
@OneToMany(cascade=CascadeType.ALL,orphanRemoving=true,fetch=FetchType.EAGER,mappedBy=“tutorial”)
private List students=new ArrayList();
公共教程(){}
公共教程(字符串标题、字符串描述、布尔值发布){
this.title=标题;
this.description=描述;
this.published=published;
}
公立学校学生(学生){
this.student.add(student);
}
公众学生名单{
留学生;
}
公共长getId(){
返回id;
}
公共字符串getTitle(){
返回标题;
}
公共无效集合标题(字符串标题){
this.title=标题;
}
公共字符串getDescription(){
返回说明;
}
公共void集合描述(字符串描述){
this.description=描述;
}
公共布尔值isPublished(){
公布报税表;
}
public void setPublished(布尔值isPublished){
this.published=isPublished;
}
}
我的版本:弹簧靴2.2
Java 1.8这个问题可能与DataJpaTest有关,在保存数据后,如果它是持久的,则刷新所有字段,如果不是,则分配空值。你可以用一个真实的容器试试,我想它会正常工作。不。我首先遇到了真实容器的问题,然后我创建了这个测试来证明它。2017年询问并回答:@Gregg如果可以,请在回答中详细说明。我理解@Transient值是如何在db端丢失的。java端字段在其持久化之前是否已删除?为什么它会影响java中的
found
对象?save()返回持久化的值,但它看起来不像是被提取到变量中。