如何将序列生成器用于非ID字段?

问题描述 投票:6回答:3
public class SequenceControlNumber extends SequenceGenerator {

    private static final Logger log =
        LoggerFactory.getLogger(SequenceGenerator.class);

    @Override
    public Serializable generate(SessionImplementor session, Object obj) {
        Connection connection = session.connection();
        try {
            PreparedStatement st = connection.prepareStatement
                   ("SELECT nextval ('sequencecontrolnumber') as nextval");
            try {
                ResultSet rs = st.executeQuery();
                try {
                    rs.next();
                    int currentVall = rs.getInt("sequencecontrolnumber");
                    int result = 0;
                    if(currentVall <255){
                        result = currentVall +1;
                    }
                    if ( log.isDebugEnabled() ) {
                        log.debug("Sequence identifier generated: " + result);
                    }
                    return result;
                }
                finally {
                    rs.close();
                }
            }
            finally {
                session.getBatcher().closeStatement(st);
            }
        }
        catch (SQLException sqle) {
            throw JDBCExceptionHelper.convert(
                    session.getFactory().getSQLExceptionConverter(),
                    sqle,"could not get next sequence value");
        }
    }

}

在我的模型类中,这是我的注释:

@GenericGenerator(name="seq_id",
        strategy="br.com.otgmobile.service.dao.SequenceControlNumber")
@GeneratedValue(generator="seq_id")
@Column(name="sequencecontrolnumber",unique=false, nullable=false)
private Integer sequenceControlNumber;

但我一直得到一个属性值异常。

javax.persistence.PersistenceException: org.hibernate.PropertyValueException: not-null property references a null or transient value: br.com.otgmobile.model.niagarahw06.ComandoNiagaraHw06.sequenceControlNumber
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1179)
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1112)
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1118)
at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:618)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:240)
at $Proxy33.persist(Unknown Source)
at br.com.otgmobile.service.dao.ComandoNiagaraHw06DAO.add(ComandoNiagaraHw06DAO.java:57)
at br.com.otgmobile.service.dao.ComandoNiagaraHw06DAO$$FastClassByCGLIB$$e19cf51d.invoke(<generated>)
at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:689)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:90)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:622)
at br.com.otgmobile.service.dao.ComandoNiagaraHw06DAO$$EnhancerByCGLIB$$69ccb4e4.add(<generated>)
at br.com.otgmobile.server.NiagaraSocketManager.testPersistComandos(NiagaraSocketManager.java:100)
at br.com.otgmobile.server.NiagaraSocketManager.start(NiagaraSocketManager.java:45)
at br.com.otgmobile.server.NiagaraDaemon.run(NiagaraDaemon.java:25)
at java.lang.Thread.run(Thread.java:722)

Caused by: org.hibernate.PropertyValueException: not-null property references a null or transient value: br.com.otgmobile.model.niagarahw06.ComandoNiagaraHw06.sequenceControlNumber
at org.hibernate.engine.Nullability.checkNullability(Nullability.java:101)
at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:313)
at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:204)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:144)
at org.hibernate.ejb.event.EJB3PersistEventListener.saveWithGeneratedId(EJB3PersistEventListener.java:69)
at org.hibernate.event.def.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:179)
at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:135)
at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:61)
at org.hibernate.impl.SessionImpl.firePersist(SessionImpl.java:800)
at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:774)
at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:778)
at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:612)
java hibernate
3个回答
1
投票

检查resultclass中generate方法返回的SequenceControlNumber的值。

BTW在这个SO问题中检查这个回答:Hibernate JPA Sequence (non-Id)


1
投票

@GeneratedValue注释不是Hibernate将作为列信息的一部分处理的东西。它必须与@Id注释一起使用。它只是说当id有id时如何生成id。

你有几个选项可以完成你想要的东西,但是没有一个像你所写的那样只使用注释。这些建议有其优点和缺点(数据库可移植性,复杂性,实体管理器与会话等),但有些想法是:

  • 实现PreInsertListener并将其添加到AnnotationConfiguration。此侦听器将查找需要此功能的实体类型,并获取/分配下一个序列值
  • 创建数据库触发器以处理使用序列值填充列。将Java代码中的列标记为insertable = false, updatable = false
  • 将生成逻辑放入实体中的回调方法,并使用@PrePersist注释对其进行标记
  • 填充字段作为构造函数的一部分(不是首选,因为那时你在构造函数中有一个DB调用和一些潜在的事务边界歧义)

0
投票

我刚刚面临一个类似的问题,我需要创建一个序列并将其附加到不是主键的字段。

我正在努力尝试使用@GeneratedValue@SequenceGenerator注释,因为如网上所述:@GeneratedValue只能在Hibernate实体字段上的@Id注释中使用。这告诉Hibernate不要关心该字段为null,它将在插入时管理到数据库中。但是这里Hibernate总是抛出异常,因为在场上忽略了GeneratedValue。

所以解决方案很简单:只需用@Generated(GenerationTime.INSERT)替换这个注释,并将columnDefinition = "serial"添加到你的@Column(name = "huhu", columnDefinition = "serial", updatable = false, ...)

通常情况下,如果您已创建了首先附加到数据库中字段的正确序列,它现在应该可以工作。

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