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我有一个电话对象和一个电话历史记录对象。我希望能够检索电话历史记录对象，然后获取其父级（电话），但由于某种原因，当我尝试执行此操作然后保留子级时，我收到一个异常，说 phone_id 未填充. 不知道如何解决这个问题，尽管我怀疑它与我的映射注释有关。

下面是我的实体类。我尝试更改注释以匹配此处双向关系部分中的建议：http: //docs.jboss.org/hibernate/annotations/3.5/reference/en/html/entity.html#entity-mapping-association但是这似乎没有奏效。我是 JPA 的新手，所以对于有更多经验的人来说这可能很简单，但我很难过。TIA。

电话实体：

package com.blah.model;

import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;

@Entity
@Table(name = "phones")
public class EPhone implements BaseModel {

    private static final long serialVersionUID = 3497994786207995664L;

    @Id
    @GeneratedValue
    @Column(name = "id")
    private Long id;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "account_id",
            nullable = false)
    private EAccount account;

    @Temporal(TemporalType.TIMESTAMP)
    private Calendar created;

    @Column(name = "value",
        nullable = false)
        private Long value;

    @OneToMany(fetch = FetchType.LAZY,
            mappedBy = "phone",
            cascade = CascadeType.ALL)
    private final List<EPhoneHistory> history;

    public EPhone() {
        this(Calendar.getInstance());
    }

    public EPhone(final Calendar createdDate) {
        setCreated(createdDate);
        history = new ArrayList<EPhoneHistory>();
    }

    public void add(EPhoneHistory phoneHistoryItem) {
        history.add(phoneHistoryItem);
    }

    public EAccount getAccount() {
        return account;
    }

    public Calendar getCreated() {
        return created;
    }

    @OneToMany(fetch = FetchType.LAZY,
            mappedBy = "phone",
            cascade = CascadeType.ALL)
    public List<EPhoneHistory> getHistory() {
        return history;
    }

    public Long getId() {
        return id;
    }

    public Long getValue() {
        return value;
    }

    public void setAccount(EAccount account) {
        this.account = account;
    }

    public void setCreated(Calendar created) {
        this.created = created;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public void setValue(Long value) {
        this.value = value;
    }

}

电话历史实体：

package com.blah.model;

import java.util.Calendar;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.EnumType;
import javax.persistence.Enumerated;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;

@Entity
@Table(name = "phone_history")
public class EPhoneHistory implements BaseModel {

    private static final long serialVersionUID = 4591314258588732076L;

    @Id
    @GeneratedValue
    @Column(name = "id")
    private Long Id;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "phone_id",
            nullable = false)
    private EPhone phone;

    @Temporal(TemporalType.TIMESTAMP)
    private Calendar created;

    @Enumerated(EnumType.ORDINAL)
    @Column(name = "type_id")
    private PhoneHistoryType type;

    public Calendar getCreated() {
        return created;
    }

    public Long getId() {
        return Id;
    }

    public EPhone getPhone() {
        return phone;
    }

    public PhoneHistoryType getType() {
        return type;
    }

    public void setCreated(Calendar created) {
        this.created = created;
    }

    public void setId(Long id) {
        Id = id;
    }

    public void setPhone(EPhone phone) {
        this.phone = phone;
    }

    public void setType(PhoneHistoryType type) {
        this.type = type;
    }

}

更新澄清（这是一个失败的测试）：

package com.blah.model.repository;

import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.transaction.annotation.Transactional;

import com.blah.AbstractBaseDbTestCase;
import com.blah.model.EPhoneHistory;
import com.blah.model.PhoneHistoryType;

public class PhoneHistoryRepositoryTest extends AbstractBaseDbTestCase {

    @Autowired
    PhoneHistoryRepository phoneHistoryRepo;

    @Test
    @Transactional
    public void testCreateAndSavePhoneHistory() {

        EPhoneHistory existingPhoneHistory = phoneHistoryRepo.find(1L);

        EPhoneHistory newPhoneHistory = new EPhoneHistory();
        newPhoneHistory.setType(PhoneHistoryType.VOICE);

        // I assume this is where I would
        // set the phone, but I don't have it.
        // existingPhoneHistory.setPhone(phone);

        // This is what I'm having trouble with. getPhone() doesn't populate the
        // phone field with the parent phone object.
        existingPhoneHistory.getPhone().add(newPhoneHistory);

        phoneHistoryRepo.persist(existingPhoneHistory);
        phoneHistoryRepo.flush();
    }
}

和失败堆栈跟踪：

org.springframework.dao.DataIntegrityViolationException: NULL not allowed for column "PHONE_ID"; SQL statement:
insert into phone_history (id, created, phone_id, type_id) values (null, ?, ?, ?) [23502-168]; SQL [n/a]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: NULL not allowed for column "PHONE_ID"; SQL statement:
insert into phone_history (id, created, phone_id, type_id) values (null, ?, ?, ?) [23502-168]
    at org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:643)
    at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:104)
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:403)
    at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:58)
    at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213)
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:163)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:622)
    at com.blah.model.repository.PhoneHistoryRepository$$EnhancerByCGLIB$$4f90cdde.flush(<generated>)
    at com.blah.model.repository.PhoneHistoryRepositoryTest.testCreateAndSavePhoneHistory(PhoneHistoryRepositoryTest.java:29)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    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.InvokeMethod.evaluate(InvokeMethod.java:20)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
    at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)
    at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:30)
    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.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: org.hibernate.exception.ConstraintViolationException: NULL not allowed for column "PHONE_ID"; SQL statement:
insert into phone_history (id, created, phone_id, type_id) values (null, ?, ?, ?) [23502-168]
    at org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.java:128)
    at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49)
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125)
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:110)
    at org.hibernate.engine.jdbc.internal.proxy.AbstractStatementProxyHandler.continueInvocation(AbstractStatementProxyHandler.java:129)
    at org.hibernate.engine.jdbc.internal.proxy.AbstractProxyHandler.invoke(AbstractProxyHandler.java:81)
    at $Proxy37.executeUpdate(Unknown Source)
    at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:96)
    at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:58)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2870)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3381)
    at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:81)
    at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:362)
    at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:203)
    at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:183)
    at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:167)
    at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:320)
    at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:287)
    at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:193)
    at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:126)
    at org.hibernate.ejb.event.EJB3PersistEventListener.saveWithGeneratedId(EJB3PersistEventListener.java:78)
    at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:208)
    at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:151)
    at org.hibernate.internal.SessionImpl.firePersistOnFlush(SessionImpl.java:870)
    at org.hibernate.internal.SessionImpl.persistOnFlush(SessionImpl.java:863)
    at org.hibernate.engine.spi.CascadingAction$8.cascade(CascadingAction.java:346)
    at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:380)
    at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:323)
    at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:208)
    at org.hibernate.engine.internal.Cascade.cascadeCollectionElements(Cascade.java:409)
    at org.hibernate.engine.internal.Cascade.cascadeCollection(Cascade.java:350)
    at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:326)
    at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:208)
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:165)
    at org.hibernate.event.internal.AbstractFlushingEventListener.cascadeOnFlush(AbstractFlushingEventListener.java:160)
    at org.hibernate.event.internal.AbstractFlushingEventListener.prepareEntityFlushes(AbstractFlushingEventListener.java:151)
    at org.hibernate.event.internal.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:88)
    at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51)
    at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1214)
    at org.hibernate.ejb.AbstractEntityManagerImpl.flush(AbstractEntityManagerImpl.java:986)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:240)
    at $Proxy32.flush(Unknown Source)
    at com.blah.model.repository.AbstractRepository.flush(AbstractRepository.java:41)
    at com.blah.model.repository.AbstractRepository$$FastClassByCGLIB$$1ba8d45c.invoke(<generated>)
    at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
    at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:689)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:155)
    ... 36 more
Caused by: org.h2.jdbc.JdbcSQLException: NULL not allowed for column "PHONE_ID"; SQL statement:
insert into phone_history (id, created, phone_id, type_id) values (null, ?, ?, ?) [23502-168]
    at org.h2.message.DbException.getJdbcSQLException(DbException.java:329)
    at org.h2.message.DbException.get(DbException.java:169)
    at org.h2.message.DbException.get(DbException.java:146)
    at org.h2.table.Column.validateConvertUpdateSequence(Column.java:293)
    at org.h2.table.Table.validateConvertUpdateSequence(Table.java:689)
    at org.h2.command.dml.Insert.insertRows(Insert.java:120)
    at org.h2.command.dml.Insert.update(Insert.java:84)
    at org.h2.command.CommandContainer.update(CommandContainer.java:75)
    at org.h2.command.Command.executeUpdate(Command.java:230)
    at org.h2.jdbc.JdbcPreparedStatement.executeUpdateInternal(JdbcPreparedStatement.java:156)
    at org.h2.jdbc.JdbcPreparedStatement.executeUpdate(JdbcPreparedStatement.java:142)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.hibernate.engine.jdbc.internal.proxy.AbstractStatementProxyHandler.continueInvocation(AbstractStatementProxyHandler.java:122)
    ... 83 more
4

3 回答 3

1

由于您已经进行了连接lazy，我怀疑您的子对象中没有phone填充父对象phoneHistory。请验证（通过 phoneHistory 调试/打印电话对象值）。如果是这样，请在保存之前先设置phone对象。phoneHistory

addPhoneHistory在Phone对象中添加一个方法，如下所示：

      public void addPhoneHistory(PhoneHistory phoneHistory){
         phoneHistory.setPhone(this); //This is importtant as its sets the parent
         if(this.phoneHistories == null){
            this.phoneHistories = new ArrayList<PhoneHistory>();
         } 
         this.phoneHistories.add(phoneHistory); 
      }

在代码中添加要在对象中添加PhoneHistory对象Phone以使用上述方法的行。

    existingPhoneHistory.getPhone().addPhoneHistory(newPhoneHistory);

in place of保存“Phone existingPhoneHistory ”也是一个好主意，如下所示：

   Phone phone = existingPhoneHistory.getPhone();
   phone.addPhoneHistory(newPhoneHistory);
   entityManager.save(phone);//use your PhoneRepo, if there to persist

希望这可以帮助。

于 2012-10-12T01:36:01.580 回答
0

检查填充 phone_id 变量的 SQL 查询（或您使用的其他一些数据采集系统）已用于获取列字段。其次，检查这些字段是否由应该创建 phone_id 数据的任何系统填写（例如，其他 servlet 管理并将信息发送到 sql 表中）。

于 2012-10-12T01:43:52.403 回答
0

应该很容易修复。

  1. 延迟加载在这里不是问题。
    您所有的测试调用都在同一个 Spring 测试事务中运行。因此，当您通过 .getXXX() 调用遍历关系以获取必要的数据时，JPA 提供程序将自动加载所有 LAZY 加载的关系。

  2. 测试代码中的错误。在子对象newPhoneHistory 中，您没有设置phone 对象，它提供了必填列phoneId。在致电之前或之后：

    existingPhoneHistory.getPhone().add(newPhoneHistory);

    只需添加：

    newPhoneHistory.setPhone(existingPhoneHistory.getPhone());

您需要手动设置双向关系双方的关系数据。从 JPA 2 规范：

托管实体之间的双向关系将基于关系拥有方持有的引用进行持久化。开发人员有责任保持拥有方的内存引用和相反方的内存引用在更改时彼此保持一致。在单向一对一和一对多关系的情况下，开发人员有责任确保（原文如此）关系的语义得到遵守。[29]

尤其重要的是要确保对关系反向方的更改会导致拥有方进行适当的更新，以确保更改同步到数据库时不会丢失。

:-)

于 2012-10-15T01:23:32.547 回答