小编use*_*112的帖子

SELECT 
    machine_id, operator_id, member_id, card_id, name, paid_amount, due_amount,
    paid_date, phone_number, @curRow := @curRow + 1 AS row_number 
FROM 
    transaction 
JOIN 
    (SELECT @curRow := 0) r where card_id='c1' order by Row_number desc limit 3 ;

当我在工作台中运行它时,它返回最后3条记录.但在我的代码中它只返回2条记录.问题是什么？

这是c#代码:

String query3 = "SELECT machine_id,operator_id,member_id,card_id,name,paid_amount,due_amount,paid_date,phone_number ,@curRow := @curRow + 1 AS row_number FROM transaction JOIN  (SELECT @curRow := 0) r where card_id=@card order by Row_number desc limit 4 ";
MySqlCommand command3 = new MySqlCommand(query3, con);
command3.Parameters.AddWithValue("@card", cardid);

using (MySqlDataReader rdr3 = command3.ExecuteReader())
{
    if …