public?void?queryAreaById(){
????Area?area?=?areaDao.queryAreaById(1);
????assertEquals("南平庫",area.getArea_name());
}

嘗試test這個queryAreaById函數時一直提示空指針異常

<select?id="queryAreaById"?resultType="com.cltj.cltj.entity.Area">
????SELECT??area_id,area_name,area_sum,create_time,last_edit_time
????FROM?cltj_area
????where?area_id?=?#{area_id}
</select>

public?interface?AreaDao?{
????List<Area>?queryArea();
????Area?queryAreaById(int?area_id);
????int?insertArea(Area?area);
????int?updateArea(Area?area);
????int?deleteArea(int?area_id);

}