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退卡是将学生表中卡号信息删除，并将status列改为不使用。 

退卡逻辑思路如下：

问题及重点代码： 

判断卡号

If Trim(txtCardNo.Text) = "" Then            MsgBox "卡号为空，请输入卡号", , "提示"            txtCardNo.SetFocus            Exit Sub        End If

判断该卡号是否下机

txtSQL1 = "select * from OnLine_info where cardno='" & Trim(txtCardNo.Text) & "'"            Set mrc1 = ExecuteSQL(txtSQL1, Msgtext1)            If mrc1.EOF = False Then                MsgBox "该卡号没有下机，请下机后退卡", , "提示"                txtCardNo.Text = ""                txtCardNo.SetFocus                Exit Sub            End If

添加 一行cancelcard 表

txtSQL2 = "select * from cancelcard_info"          Set mrc2 = ExecuteSQL(txtSQL2, Msgtext2)            With mrc2             mrc2.AddNew             .Fields(0) = Trim(mrc.Fields(1))             .Fields(1) = Trim(mrc.Fields(0))             .Fields(2) = Trim(mrc.Fields(7))             .Fields(3) = Date             .Fields(4) = Time             .Fields(5) = Trim(mrcOnwork.Fields(0))             .Fields(6) = "不使用"             .Fields(7) = "未结账"                         mrc.Update            mrc2.Update          End With

显示该卡号信息

a = Val(mrc2.Fields(1))          b = Val(mrc2.Fields(2))          c = mrc2.Fields(3)          d = Val(mrc2.Fields(4))          e = Val(mrc2.Fields(5))                      Text3.Text = "退卡卡号：" & a & vbCrLf & "应退金额:" & b & vbCrLf & "退卡日期:" & c & vbCrLf & "退卡时间：" & Format(Now(), "HH:mm:ss")          txtRecharge.Text = b                    txtSQL3 = "delete from student_info where cardno='" & Trim(txtCardNo.Text) & "'"             Set mrc3 = ExecuteSQL(txtSQL3, Msgtext3)                    MsgBox "退卡成功", , "提示"

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