public string GetDataByNum(string num)
{
if (string.IsNullOrEmpty(num))
{
return("");
}
StringBuilder str = new StringBuilder();
str.Append("select* from( ");
str.Append("select ");
str.Append(" top " + num);
str.Append(" * from caifenfen ");
str.Append(" order by id desc");
str.Append(" ) as a order by id asc");
DataTable dt = caifenfen.GetBySql(str.ToString());
return(JsonHelp.DataTableToStr(dt));
}