///<summary>
///查询单个模型实体
///</summary>
///<param name="wheres">条件</param>
///<param name="columns">列集合</param>
///<returns>实体</returns>
public Dictionary <string, object> QuerySingleByWheresX(object wheres, object columns)
{
return(_dao.QuerySingleByWheresX(wheres, columns));
}