hibernate(单向连接配置)

简捷开发
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     单向关联

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     实例1、
     ----------------------------------------------------------
     many-to-one

     类文件 添加属性
     private customer customerId;

     映射文件
     <!--  <many-to-one name="customerId" not-null="true"/> -->

     测试类：
  Customer c=new Customer("tudou","123");
  User u=new User("digua","123");
  u.setCustomerId(c);
  session.save(c);
  session.save(u);
  ----------------------------------------------------------
     one-to-one

     类文件同上
     <!--  <many-to-one name="customerId" not-null="true" unique="true"/> -->

     测试类：同上
     ----------------------------------------------------------
     one-to-many
 
     类文件 添加属性
     private Set customerId=new HashSet();

     映射文件
     <set name="customerId" fetch="join" lazy="false" cascade="save-update,persist" >
        <key column="userId"
        not-null="true"/>
        <one-to-many
        class="com.feng.pojo.Customer" />
       </set>

    测试类：
    Customer c=new Customer("tudou","123");
  Customer c2=new Customer("tudou2","123");
  User u=new User("digua","123");
  Set customers=new HashSet();
     customers.add(c);
     customers.add(c2);
  u.setCustomerId(customers);
  ...
  session.save(u);
  session.save(c);
     ----------------------------------------------------------
 
 
  ？？？？？？？？？？？？？？？？？？？？？？？？？？？？
 
  <!--使用连接表的单向关联-->
 
  实例2、
  <!-- one-to-many -->
  类文件 添加属性:同上
  映射文件：

  <set name="customerId" fetch="join" lazy="false" cascade="save-update,persist" >
        <key column="userId"
        not-null="true"/>
        <many-to-many
        class="com.feng.pojo.Customer" unique="true"/>
       </set>
    测试类：同上
     ----------------------------------------------------------
    <!-- many-to-one-->
   
  类文件 添加属性:同上
 
  映射文件：
  <join table="jointable" optional="true">
        <key column="userId" unique="true"/>
        <many-to-one name="customerId" not-null="true"/>
       </join>
   
    测试类：同上
     ----------------------------------------------------------
     <!-- one-to-one-->
   
  类文件 添加属性:同上
 
  映射文件：
  <join table="jointable" optional="true">
        <key column="userId" unique="true"/>
        <many-to-one name="customerId" not-null="true" unique="true"/>
       </join>
   
    测试类：同上
     ----------------------------------------------------------
      <!-- many-to-many(单向)-->
   
  类文件 添加属性:
  相关类添加属性 例如：private Set CustomerId;
 
  相关类添加
  映射文件：
  <set name="customerId" cascade="save-update" lazy="false" table="jointable">
        <key column="userId"/>
        <many-to-many column="customerId"
        class="com.feng.pojo.Customer"/>
        </set>
   
    测试类：
   
   
  Customer c=new Customer("tudou","123");
  Customer c2=new Customer("tudou","123");
  User u=new User("digua","123");
  User u2=new User("digua","123");
  Set customers=new HashSet();
  Set users=new HashSet();
  users.add(u);
  users.add(u2);
  customers.add(c);
  customers.add(c2);
  u.setCustomerId(customers);
  /*c.setUserId(users);*/
  
   Configuration configuration=new Configuration();
   configuration.configure("/hibernate.cfg.xml");
   SessionFactory sessionFactory=configuration.buildSessionFactory();
   Session session=sessionFactory.openSession();
   Transaction trans=session.beginTransaction();
   session.save(c);
   session.save(u);
   
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       双向关联

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