varobj=cn.QueryFirstOrDefault<dc_month_sale_profit_details>("select * from dc_month_sale_profit_details where delstatus=0 and id="+id);
if(obj==null)
{
return"删除失败,找不到该记录。";
}
varresult=cn.Execute("update dc_month_sale_profit_details set delstatus=1,lastupdatetime='"+DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss")+"',lastupdateuserid="+uid+",lastupdateusername='"+username+"' where id="+id);