Question

我想使用spring jpa有选择地更新表中的字段。根据{{3}}，这应该可以通过简单的函数来实现，例如：

 public TestEntity update(UUID uuid, String string2new) {
    TestEntity testEntity = testEntityRepository.getOne(uuid);
    testEntity.setString2(string2new);
    return testEntityRepository.save(testEntity);
}

其中TestEntity是（省略了getter和setter）：

@Entity
public class TestEntity {

    @GeneratedValue(generator = "uuid2")
    @GenericGenerator(name = "uuid2", strategy = "uuid2")
    @Id
    @Column(columnDefinition = "BINARY(16)")
    private UUID id;

    private String string;
    private String string2;
}

但是，我的测试代码：

@Test
public void selectiveUpdate2() {
    TestEntity testEntity = testEntityRepository.save(TestEntity.builder().string("lulu").string2("lala").build());
    System.out.println(testEntityRepository.findAll());
    testEntityService.updateString2(testEntity.getId(), "lele");
    System.out.println(testEntityRepository.findAll());
}

但是我遇到如下异常：

[TestEntity（id = 61a24efc-877f-4a89-9e75-a9933fe7c04c，string = lulu，string2 = lala）] org.hibernate.LazyInitializationException：无法初始化代理[com.example.test_db_zeug.TestEntity＃61a24efc-877f-4a89-9e75-a9933fe7c04c]-无会话在org.hibernate.proxy.AbstractLazyInitializer.initialize（AbstractLazyInitializer.java:169）在org.hibernate.proxy.AbstractLazyInitializer.getImplementation（AbstractLazyInitializer.java:309）在org.hibernate.proxy.pojo.bytebuddy.ByteBuddyInterceptor.intercept（ByteBuddyInterceptor.java:45）在org.hibernate.proxy.ProxyConfiguration $ InterceptorDispatcher.intercept（ProxyConfiguration.java:95） com.example.test_db_zeug.TestEntity $ HibernateProxy $ GilcmZfo.setString2（未知来源）在com.example.test_db_zeug.TestEntityService.update（TestEntityService.java:39）在com.example.test_db_zeug.TestDbZeugApplicationTests.selectiveUpdate（TestDbZeugApplicationTests.java:27）在sun.reflect.NativeMethodAccessorImpl.invoke0（本机方法）处在sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62）在sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）在java.lang.reflect.Method.invoke（Method.java:498）在org.junit.runners.model.FrameworkMethod $ 1.runReflectiveCall（FrameworkMethod.java:50）在org.junit.internal.runners.model.ReflectiveCallable.run（ReflectiveCallable.java:12）在org.junit.runners.model.FrameworkMethod.invokeExplosively（FrameworkMethod.java:47）在org.junit.internal.runners.statements.InvokeMethod.evaluate（InvokeMethod.java:17）在org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate（RunBeforeTestExecutionCallbacks.java:74）在org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate（RunAfterTestExecutionCallbacks.java:84）在org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate（RunBeforeTestMethodCallbacks.java:75）在org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate（RunAfterTestMethodCallbacks.java:86）在org.springframework.test.context.junit4.statements.SpringRepeat.evaluate（SpringRepeat.java:84）在org.junit.runners.ParentRunner.runLeaf（ParentRunner.java:325）在org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild（SpringJUnit4ClassRunner.java:251）在org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild（SpringJUnit4ClassRunner.java:97）在org.junit.runners.ParentRunner $ 3.run（ParentRunner.java:290）在org.junit.runners.ParentRunner $ 1.schedule（ParentRunner.java:71）在org.junit.runners.ParentRunner.runChildren（ParentRunner.java:288）在org.junit.runners.ParentRunner.access $ 000（ParentRunner.java:58）在org.junit.runners.ParentRunner上$ 2.evaluate（ParentRunner.java:268）在org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate（RunBeforeTestClassCallbacks.java:61）在org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate（RunAfterTestClassCallbacks.java:70）在org.junit.runners.ParentRunner.run（ParentRunner.java:363）在org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run（SpringJUnit4ClassRunner.java:190）在org.junit.runner.JUnitCore.run（JUnitCore.java:137）在com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs（JUnit4IdeaTestRunner.java:68）在com.intellij.rt.execution.junit.IdeaTestRunner $ Repeater.startRunnerWithArgs（IdeaTestRunner.java:47）在com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart（JUnitStarter.java:242）在com.intellij.rt.execution.junit.JUnitStarter.main（JUnitStarter.java:70）

Spring Jpa选择性更新

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