<?php/** * 公司与部门关联模型 */class CompanyRelationModel extends RelationModel{        //主表名称    protected $tableName = ‘company‘;        //定义关联关系    protected $_link = array(                    //关联表名称        ‘department‘ => array(            ‘mapping_type‘        =>     MANY_TO_MANY,                //多对多关系            ‘foreign_key‘        =>    ‘company_id‘,                //主表外键            ‘relation_key‘        =>    ‘department_id‘,            //关联表外键            ‘relation_table‘    =>    ‘sys_company_department‘,    //中间表（员工对应角色表）,            ‘mapping_fields‘    =>     ‘id, name, pId‘                //关联表显示字段        )    );    }?>