hibernate多对多
hibernate多对多处理设置
例如角色与权限：
角色中：
privateSetprivileges=newHashSet();
权限中：
privateSet<Role>roles=newHashSet<Role>();
<classname="entity.Role"table="ROLE"dynamic-update="true">
<idname="roleId"type="java.lang.Integer">
<columnname="roleID"/>
<generatorclass="identity"></generator>
</id>
<propertyname="roleName"type="java.lang.String">
<columnname="roleName"length="50"/>
</property>
<propertyname="mender"type="java.lang.Integer">
<columnname="mender"/>
</property>
<propertyname="modifyTime"type="java.sql.Timestamp">
<columnname="modifyTime"length="50"/>
</property>
<setname="privileges"cascade="all"table="ROLE_PRIVILEGE"lazy="true">
<keycolumn="roleID"/>
<many-to-manyclass="entity.Privilege"column="pvID"order-by="sequence"/>
</set>
</class>
<classname="entity.Privilege"table="PRIVILEGE">
<idname="pvId"type="java.lang.Integer">
<columnname="pvID"/>
<generatorclass="identity"></generator>
</id>
<propertyname="parentId"type="java.lang.Integer">
<columnname="parentID"/>
</property>
<propertyname="pvName"type="java.lang.String">
<columnname="pvName"length="50"/>
</property>
<propertyname="level"type="java.lang.Short">
<columnname="level"/>
</property>
<propertyname="url"type="java.lang.String">
<columnname="url"length="50"/>
</property>
<propertyname="isView"type="java.lang.Short">
<columnname="isView"/>
</property>
<propertyname="modifyTime"type="java.sql.Timestamp">
<columnname="modifyTime"length="50"/>
</property>
<setname="roles"table="ROLE_PRIVILEGE"lazy="true"cascade="none">
<keycolumn="pvID"/>
<many-to-manyclass="entity.Role"column="roleID"/>
</set>
</class>
修改角色的时候1根据id去查询角色实体
2将需要更新的字段更新到查询出来的角色实体中
修改角色的权限1删除当前角色的权限
2添加当前角色权限
实例：
publicvoidupdatePvRole(Integer[]pvIds,IntegerroleId){
if(pvIds==null||pvIds.length==0){
return;
}
Rolerole=roleDao.getRole(roleId);
SetsetOld=role.getPrivileges();
Iteratorit=setOld.iterator();
while(it.hasNext()){
it.next();
it.remove();
}
for(IntegerpvId:pvIds){
Privilegeprivilege=privilegeDao.getPrivilege(pvId);
setOld.add(privilege);
}
roleDao.updateRole(role);
}