在我做系统架构时遇到情况是这样：资源菜单实体类(Resource)和角色实体类(Role)是多对多关系，需要各个角色可以个性化自己的资源菜单顺序。
二、设计理念
多对多的关系拆分为两个一对多
三、具体配置
方式一：XML方式
Role实体
public class Role implements Serializable {
/*ID*/
privateLong id;
/*名称*/
privateString name;
/*与RoleResource的一对多关系*/
PrivateSet<RoleResource> roleResources= new HashSet<RoleResource>();
//get set
}
Resource实体
public class Resource implements Serializable {
/*ID*/
privateLong id;
/*名称*/
privateString name;
/*与RoleResource的一对多关系*/
privateSet<RoleResource> roleResources = new HashSet<RoleResource>();
// getset
}
RoleResource辅助实体
public class RoleResource implements Serializable{
/*ID*/
privateLong id;
/*与Role的多对一关系*/
privateRole role;
/*与Resource的多对一关系*/
privateResource resource;
/*排序字段*/
privateInteger sort;
// getset
}
Role.hbm.xml
<hibernate-mappingpackage="com.glw.domain">
<classname="Role" table="glw_role">
<idname="id" column="id">
<generatorclass="native" />
</id>
<propertyname="name" type="string" not-null="true"unique="true" length="50"/>
<!--roleResource,与RoleResource的一对多关系-->
<setname="roleResources" order-by="id ASC"inverse="true" lazy="false">
<keycolumn="roleId"/>
<one-to-manyclass="RoleResource" />
</set>
</class>
</hibernate-mapping>
Resource.hbm.xml
<hibernate-mappingpackage="com.glw.domain">
<classname="Resource" table="glw_resource">
<idname="id" column="id">
<generatorclass="native" />
</id>
<propertyname="name" type="string" not-null="true"length="50"/>
<!--roleResources,与RoleResource的一对多关系-->
<setname="roleResources" order-by="id ASC"inverse="true" lazy="false">
<keycolumn="resourceId"/>
<one-to-manyclass="RoleResource"/>
</set>
</class>
</hibernate-mapping>
RoleResource.hbm.xml
<hibernate-mappingpackage="com.glw.domain">
<classname="RoleResource" table="glw_role_resource">
<idname="id" column="id">
<generatorclass="native" />
</id>
<propertyname="sort" type="integer" not-null="true" />
<!--role,与Role的多对一关系-->
<many-to-onename="role" column="roleId" />
<!--resource,与Resource的多对一关系-->
<many-to-onename="resource"column="resourceId"/>
</class>
</hibernate-mapping>
Hibernate.cfg.xml中配置
<mappingresource="com/glw/domain/Role.hbm.xml"/>
<mappingresource="com/glw/domain/Resource.hbm.xml" />
<mappingresource="com/glw/domain/RoleResource.hbm.xml" />
方式二：Annotation方式
Role实体
@Entity
@Table(name="glw_role")
public class Role {
@Id
@GeneratedValue(strategy=GenerationType.TABLE)
privateLong id;
@Column(length=50)
privateString name;
@OneToMany(mappedBy="role",cascade=CascadeType.ALL)
privateSet<RoleResource> roleResources = new HashSet<RoleResource>();
//get set
}
Resource实体
@Entity
@Table(name="glw_resource")
public class Resource {
@Id
@GeneratedValue(strategy=GenerationType.TABLE)
privateLong id;
@Column(length=50)
privateString name;
@OneToMany(mappedBy="resource",cascade=CascadeType.ALL)
privateSet<RoleResource> roleResources = new HashSet<RoleResource>();
// getset
}
RoleResource辅助实体
@Entity
@Table(name="glw_role_resource")
public class RoleResource {
@Id
@GeneratedValue(strategy=GenerationType.TABLE)
privateLong id;
@Column
privateInteger sort;
@ManyToOne(cascade=CascadeType.ALL)
@JoinColumn(name="roleId",nullable=true)
privateRole role;
@ManyToOne(cascade=CascadeType.ALL)
@JoinColumn(name="resourceId",nullable=true)
privateResource resource;
// getset
}
Hibernate.cfg.xml中配置
<mapping/>
<mappingclass="com.glw.domain.Resource"/>
<mappingclass="com.glw.domain.RoleResource"/>
四、完毕
Xml和Annotation方式可任意选取一种，以上本人均测试通过。
