我正在使用 Spring Data(JPA 风格)和 Hibernate 为新的 Web 应用程序构建数据层。我遇到了@OneToMany 集合没有填充数据加载的问题。我试过 FetchType.LAZY 和 FetchType.EAGER,结果没有变化。这些注释是否设置正确?
这是父类(为空间而编辑):
public class AppMaster implements java.io.Serializable {
@Id
@GeneratedValue
@Column(name="APPLICATION_ID", unique=true, nullable=false)
private long ApplicationId;
@OneToMany(cascade=CascadeType.ALL, fetch=FetchType.EAGER, mappedBy="appMaster")
private Set<AppAddress> addresses = new HashSet<AppAddress>(0);
这是子类(也为空间编辑):
public class AppAddress implements java.io.Serializable {
@Id
@GeneratedValue
@Column(name="ADDRESS_ID", unique=true, nullable=false)
private long addressId;
@ManyToOne(fetch=FetchType.LAZY)
@JoinColumn(name="APPLICATION_ID", nullable=false)
private AppMaster appMaster;
我的数据是在 Junit 测试的 @Before 设置部分生成并保存的,如下所示:
AppMaster table:
APPLICATION_ID=1
AppAddress table:
ADDRESS_ID=1, APPLICATION_ID=1
ADDRESS_ID=2, APPLICATION_ID=1
ADDRESS_ID=3, APPLICATION_ID=1
ADDRESS_ID=4, APPLICATION_ID=1
所以我应该可以说
AppMaster master = appMasterService.findOne(1); // Load existing record
assertEquals(4, master.getAddresses().size()); // Loaded 4 dependent records
但是当我这样做时,我得到了这个:
java.lang.AssertionError:
Expected :4
Actual :0
at org.junit.Assert.fail(Assert.java:93)
at org.junit.Assert.failNotEquals(Assert.java:647)
at org.junit.Assert.assertEquals(Assert.java:128)
at org.junit.Assert.assertEquals(Assert.java:472)
at org.junit.Assert.assertEquals(Assert.java:456)
at test.service.AppAddressServiceTest.setupData(AppAddressServiceTest.java:45)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)
at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174)
at org.junit.runner.JUnitCore.run(JUnitCore.java:157)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:63)
任何人都可以对此有所了解吗?