Hibernate实体映射

浏览数：20 / 时间：2015年06月20日

Hibernate实体映射步骤
1.写注释

?格式为：？属性，表达的是本对象与？的？关系。

2，拷模板：

多对一

<many-to-one name=“” class=“” column=“”/>

一对多（Set）

<one-to-many class=""/>

</set>

多对多（Set）

<many-to-many class="" column=""/>

</set>

3，填空：

?name属性：属性名（注释中的第1问号）

?class属性：关联的实体类型（注释中的第2个问号）

?column属性：

?<many-to-onecolumn="..">：一般可以写成属性名加Id后缀，如属性为department，则column值写成departmentId。

?一对多中的<keycolumn="..">：从关联的对方（对方是多对一）映射中把column值拷贝过来。

?多对多中的<keycolumn=“..”>：一般可以写成本对象的名加Id后缀，如本对象名为User，则写为userId。

?多对多中的<many-to-manycolumn=“..”>：一般可以写为关联对象的名称加Id后缀。

完成

示例：
实体类：
public class User {
   private Long id;
    private Department department;
   private Set<Role> roles = new HashSet<Role>();
    .......
}

public class Department {
   private Long id;
   private Set<User> users = new HashSet<User>();
   private Department parent;
   private Set<Department> children = new HashSet<Department>();
    .......
}

public class Role {
   private Long id;
   private Set<User> users = new HashSet<User>();
   private Set<Privilege> privileges = new HashSet<Privilege>();
    .........
}

public class Privilege {
   private Long id;
   private Set<Role> roles = new HashSet<Role>();
   private Privilege parent;
   private Set<Privilege> children = new HashSet<Privilege>();
    .........
}
映射文件：
<hibernate-mapping package="cn.usst.oa.domain">
   <class name="User" table="usst_user">
       <id name="id">
           <generator class="native" />
       </id>
       
       <many-to-one name="department" class="Department" column="departmentId"></many-to-one>

       
       <set name="roles" table="usst_user_role">
           <key column="userId"></key>
           <many-to-many class="Role" column="roleId"></many-to-many>
       </set>
   </class>
</hibernate-mapping>

<hibernate-mapping package="cn.usst.oa.domain">
   <class name="Department" table="usst_department">
       <id name="id">
            <generator class="native"/>
       </id>
       
       <set name="users">
           <key column="departmentId"></key>
           <one-to-many class="User"/>
       </set>

       
       <many-to-one name="parent" class="Department" column="parentId"></many-to-one>

       
       <set name="children" cascade="delete">
           <key column="parentId"></key>
           <one-to-many class="Department"/>
       </set>
   </class>
</hibernate-mapping>

<hibernate-mapping package="cn.usst.oa.domain">
   <class name="Role" table="usst_role">
       <id name="id">
           <generator class="native" />
       </id>
       
       <set name="users" table="usst_user_role">
           <key column="roleId"></key>
           <many-to-many class="User" column="userId"></many-to-many>
       </set>
       
       <set name="privileges" table="itcast_role_privilege">
           <key column="roleId"></key>
           <many-to-many class="Privilege" column="privilegeId"></many-to-many>
       </set>
   </class>
</hibernate-mapping>

<hibernate-mapping package="cn.usst.oa.domain">
   <class name="Privilege" table="usst_privilege">
       <id name="id">
           <generator class="native" />
       </id>
       
       <set name="roles" table="usst_role_privilege">
           <key column="privilegeId"></key>
           <many-to-many class="Role" column="roleId"></many-to-many>
       </set>

       
       <many-to-one name="parent" class="Privilege" column="parentId"></many-to-one>
       
       <set name="children" order-by="id ASC">
           <key column="parentId"></key>
           <one-to-many class="Privilege" />
       </set>
   </class>
</hibernate-mapping>

Hibernate实体映射,古老的榕树,5-wow.com

郑重声明：本站内容如果来自互联网及其他传播媒体，其版权均属原媒体及文章作者所有。转载目的在于传递更多信息及用于网络分享，并不代表本站赞同其观点和对其真实性负责，也不构成任何其他建议。

Hibernate实体映射