Hibernate的注释，问题与复合主键

我有两个表 T1（A，B，C，d） - 一个是主键 T2（a，e）其中（a，e）是复合主键 a是外键引用T1（a）

T1-T2关系是一对多关系。

因此，我创建三个类

C1为T1 它有五个字段 - A，B，C，d，c2Set与设置器&吸气剂
C2为T2 它具有两个字段 - 分别为C1，C3的c1，c3 - 与设置者&获取者
C3我正在定义C3来表示复合T2 的主键它有两个字段（A，E）与设置器&吸气剂

我使用以下注释在类C1，C2，以限定休眠映射，C3分别

@Entity 
@Table(name = "T1", schema = "dbo", uniqueConstraints = { @UniqueConstraint(columnNames = "a") }) 

@Id 
@Column(name = "a", unique = true, nullable = false) 

@Transient 
private Set<C2> c2Set = new HashSet<C2>(); 

@OneToMany(fetch = FetchType.EAGER, mappedBy = "c1") 
    public Set<C2> getC2Set() { 
     return c2Set; 
    }

@Entity  
@Table(name="T2", schema = "dbo") 

@Id 
public C3 getC3() { 
     return c3; 
    } 

private C1 c1; 
@ManyToOne(fetch = FetchType.EAGER) 
    @JoinColumn(name = "a",insertable= false, updatable=false) 
    public C1 getC1() { 
     return c1; 
    }

@Embeddable 

@Column(name = "a") 
    public String getA() { 
     return a; 
    } 

@Column(name="e") 
    public String getE() { 
     return e; 
    } 


@Service 
public class C1ServiceImpl implements C1Service { 

    @Autowired 
    @Qualifier("transactionProxy") 
    private GenericDAO genericDAO; 


    public GenericDAO getGenericDAO() { 
     return genericDAO; 
    } 

    public void setGenericDAO(GenericDAO genericDAO) { 
     this.genericDAO = genericDAO; 
    } 


    @Override 
    public void registerC1() { 

     C1 c1=new C1(); 
     c1.setA("aValue"); 
       c1.setB("someValue"); 
       c1.setC("someValue"); 
       c1.setD("someValue"); 

     C3 compositeKey1 = new C3(); 
     compositeKey1.setA("aValue"); 
     compositeKey1.setE("e1"); 

       C3 compositeKey2 = new C3(); 
     compositeKey1.setA("aValue"); 
     compositeKey1.setE("e2"); 


     C2 c2_1=new C2(); 
     c2_1.setC3(compositeKey1); 

       C2 c2_2=new C2(); 
     c2_2.setC3(compositeKey2); 




     Set<C2> eSet = new HashSet<C2>(); 
     eSet.add(c2_1); 
     eSet.add(c2_2); 

     c1.setRoles(eSet);----------------------Important 

     genericDAO.registerUser(c1); 
    }  

    } 





@Repository 
@Transactional 
public class HibernateDAO implements GenericDAO { 

    @Autowired 
    private SessionFactory sessionFactory; 

    public SessionFactory getSessionFactory() { 
     return sessionFactory; 
    } 

    public void setSessionFactory(SessionFactory sessionFactory) { 
     this.sessionFactory = sessionFactory; 
    } 

    private Session currentSession() { 
     return sessionFactory.getCurrentSession(); 
    } 

    @Override 
    public void registerC1(C1 c1) { 
     Session session = currentSession(); 
     session.beginTransaction(); 
     session.save(c1);----------------------------------------- Here I feel insertion should happen in both T1 & T2 tables. What should I should I do, should I insert into T2 in                   the same way as I am doing for T1 
     session.getTransaction().commit(); 

    } 




} 



<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" 
     destroy-method="close"> 
     <property name="driverClassName" value="com.microsoft.sqlserver.jdbc.SQLServerDriver" /> 
     <property name="url" 
      value="XXXXXXXXXXXXXXXXXXXXXXX" /> 
     <property name="username" value="dddddd" /> 
     <property name="password" value="eeeeee" /> 
    </bean> 
    <bean id="sessionFactory" 
     class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"> 
     <property name="dataSource" ref="dataSource" /> 
     <property name="packagesToScan" value="<package in which C1,C2,C3,Generic DAO, HibernateDAO live>" /> 
     <property name="annotatedClasses"> 
    <list> 
     <value>Fully qualified name of C1</value> 
    </list> 
    </property> 

     <property name="hibernateProperties"> 
      <props> 
       <prop key="hibernate.current_session_context_class">thread</prop> 
       <prop key="hibernate.transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory 
       </prop> 
       <prop key="dialect">org.hibernate.dialect.SQLServerDialect</prop> 
       <prop key="hibernate.show_sql">true</prop> 
      </props> 
     </property> 
    </bean> 

    <bean id="myTxManager" 
     class="org.springframework.orm.hibernate3.HibernateTransactionManager"> 
     <property name="sessionFactory" ref="sessionFactory" /> 
    </bean> 
    <bean id="transactionProxy" 
     class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean"> 
     <property name="proxyTargetClass" value="true" /> 
     <property name="transactionManager"> 
      <ref bean="myTxManager" /> 
     </property> 
     <property name="transactionAttributes"> 
      <props> 
       <prop key="*">PROPAGATION_REQUIRED</prop> 
      </props> 
     </property> 
     <property name="target"> 
      <bean class="fully qualified name of HibernateDAO"> 
       <property name="sessionFactory" ref="sessionFactory" /> 
     </bean> 
     </property> 
    </bean>

我在插入（保存）数据时遇到问题。数据到T1是越来越插入但没有插入在T2（我认为这里应该自动发生）发生了什么？请告诉我在哪里，我错误地做事情。而且，我想了解更多关于Hibernate注解。任何人都可以点我一些有用的在线资源。

而且，它的好处是从实体类表单bean分开？请告诉我可以了解的资源

来源

2011-02-27 Vivekanand Alampally

Hibernate默认情况下不保留由关系引用的对象。您需要配置关系的级联，使休眠做到这一点：

@OneToMany(fetch = FetchType.EAGER, mappedBy = "c1", cascade = CascadeType.ALL) 
public Set<C2> getC2Set() { 
    return c2Set; 
}

参见：

11.11. Transitive persistence

来源

2011-02-28 08:29:52 axtavt

Hibernate的注释，问题与复合主键

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