Hibernate的註釋，問題與複合主鍵

我有兩個表 T1（A，B，C，d） - 一個是主鍵 T2（a，e）其中（a，e）是複合主鍵 a是外鍵引用T1（a）

T1-T2關係是一對多關係。

因此，我創建三個類

C1爲T1 它有五個字段 - A，B，C，d，c2Set與設置器&吸氣劑
C2爲T2 它具有兩個字段 - 分別爲C1，C3的c1，c3 - 與設置者&獲取者
C3我正在定義C3來表示複合T2 的主鍵它有兩個字段（A，E）與設置器&吸氣劑

我使用以下注釋在類C1，C2，以限定休眠映射，C3分別

@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）數據時遇到問題。數據到T1是越來越插入但沒有插入在T2（我認爲這裏應該自動發生）發生了什麼？請告訴我在哪裏，我錯誤地做事情。而且，我想了解更多關於Hibernate註解。任何人都可以點我一些有用的在線資源。

而且，它的好處是從實體類表單bean分開？請告訴我可以瞭解的資源

來源

2011-02-27 Vivekanand Alampally

Hibernate默認情況下不保留由關係引用的對象。您需要配置關係的級聯，使休眠做到這一點：

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

參見：

11.11. Transitive persistence

來源

2011-02-28 08:29:52 axtavt

Hibernate的註釋，問題與複合主鍵

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