hibernate(双向连接配置)
简捷开发
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双向关联
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实例1、
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one-to-many /many-to-one
类文件 添加属性
(many)
private Set customerId=new HashSet();
(one)
private User userId;
映射文件
(many)
<set name="customerId" fetch="join" lazy="false" cascade="save-update,persist" >
<key column="userId"
not-null="false"/>
<one-to-many
class="com.feng.pojo.Customer" />
</set>
(one)
测试类：
Customer c=new Customer("tudou","123");
Customer c2=new Customer("tudou","123");
User u=new User("digua","123");
Set coustomers=new HashSet();
coustomers.add(c);
coustomers.add(c2);
u.setCustomerId(coustomers);
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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one-to-one
类文件
(one)
private Customer customerId;
(one)
private User userId;
映射文件
(one)
<many-to-one name="customerId"
unique="true"
not-null="true"/>
(one)
<one-to-one name="userId" class="com.feng.pojo.User"/>
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");
u.setCustomerId(c);
u2.setCustomerId(c2);
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(c2);
session.save(u);
session.save(u2);
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one-to-one(基于主键关联的 one-to-one)
类文件
(one)
private Customer customerId;
(one)
private User userId;
映射文件
(one)
<one-to-one name="customerId" cascade="all" class="com.feng.pojo.Customer"/>
(one)
<id name="customerId">
<generator class="foreign">
<param name="property">userId</param>
</generator>
</id>
<one-to-one name="userId" constrained="true" class="com.feng.pojo.User"/>
测试类：
Customer c=new Customer("tudou","123");
User u=new User("digua","123");
c.setUserId(u);
u.setCustomerId(c);
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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？？？？？？？？？？？？？？？？？？？？？？？？？？？？
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<!--使用连接表的-->
实例2、
<!-- one-to-many/many-to-one -->
类文件 添加属性:
(one)
private Set customerId=new HashSet();
(many)
private User userId;
映射文件：
(one)
<set name="customerId" fetch="join" lazy="false" cascade="save-update,persist" >
<key column="userId"
not-null="true"/>
<many-to-many unique="true"
class="com.feng.pojo.Customer" />
</set>
(many)
<join table="jointab"
inverse="true" optional="true">
<key column="cstomerId"/>
<many-to-one name="userId" column="userId" not-null="true"/>
</join>
测试类：
Customer c=new Customer("tudou","123");
Customer c2=new Customer("tudou","123");
User u=new User("digua","123");
Set customers=new HashSet();
customers.add(c);
customers.add(c2);
c.setUserId(u);
u.setCustomerId(customers);
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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<!-- one-to-one-->
类文件 添加属性:
(one)
private Customer customerId;
(one)
private User userId;
映射文件：
(one)
<join
table="jointab"
optional="true"
>
<key column="userId" unique="true"/>
<many-to-one name="customerId" column="customerId" not-null="true" unique="true" />
</join>
(one)
<join table="jointab"
inverse="true"
optional="true">
<key column="customerId"
unique="true"/>
<many-to-one name="userId"
column="userId"
not-null="true"
unique="true"/>
</join>
测试类：
Customer c=new Customer("tudou","123");
Customer c2=new Customer("tudou","123");
User u=new User("digua","123");
u.setCustomerId(c);
c.setUserId(u);
Configuration configuration=new Configuration();
configuration.configure("/hibernate.cfg.xml");
SessionFactory sessionFactory=configuration.buildSessionFactory();
Session session=sessionFactory.openSession();
Transaction trans=session.beginTransaction();
session.save(u);
session.save(c);
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<!-- many-to-many(双向)-->
类文件 添加属性:
相关类添加属性 例如：
private Set CustomerId;
private Set userId=new HashSet();
相关类添加
映射文件：
(many-to-many)
<set name="customerId" cascade="save-update" lazy="false" table="jointable">
<key column="userId"/>
<many-to-many column="customerId"
class="com.feng.pojo.Customer"/>
</set>
(many-to-many)
<set name="userId" cascade="save-update" lazy="false" table="joinb">
<key column="customerId" />
<many-to-many class="com.feng.pojo.User" column="userId"/>
</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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