机房收费系统--充值

Private Sub Command1_Click()
    Dim mrc As ADODB.Recordset  ' adodb是动态数据链接对象    Recordset 是adodb的一个子类 （数据集,数据表在内存的映射）
    Dim txtsql As String
    Dim msgtext As String
    Dim cash1 As Integer
    Dim cash2 As Integer
    Dim student As String       '获取学号
    
    

    txtsql = "select * from student_Info where cardno='" & cardno.Text & "'"   '在student表中查询卡号是否存在
    Set mrc = ExecuteSQL(txtsql, msgtext)
    If mrc.EOF = True Then
    MsgBox "卡号不存在，请重新输入！", vbOKOnly + vbExclamation, "警告"         '当卡号不存在时，给出提示
        cardno.SetFocus
    Else
    txtsql = "SELECT * FROM student_Info WHERE cardno = '" & Trim(cardno.Text) & "' "   '如果存在，查询原来金额
    Set mrc = ExecuteSQL(txtsql, msgtext)
    student = mrc.Fields(1)
    cash1 = mrc.Fields(7)
    a = mrc.Fields(9)
    
    txtsql = "INSERT INTO ReCharge_Info(studentNo,cardno,addmoney,date,time,UserID,status) VALUES('" & student & "','" & cardno & "','" & addmoney & "', '" & Date & "', '" & Time & "', '" & a & "', '未结账')"
    Set mrc = ExecuteSQL(txtsql, msgtext)               '进行充值，将给出的提示与 充值表中相对应
    cash2 = cash1 + addmoney.Text                       '总金额数=原有金额数+充值金额数
    
    txtsql = "UPDATE student_Info set cash = '" & cash2 & "' where cardno = '" & cardno.Text & "'"
    Set mrc = ExecuteSQL(txtsql, msgtext)               '更新到学生表中
    
        
    Text3.Text = "充值卡号:" & cardno.Text & vbCrLf & vbCrLf & _
                 "充值金额:" & cash2 & vbCrLf & vbCrLf & _
                 "充值日期:" & Date & vbCrLf & vbCrLf & _
                 "充值时间:" & Time & vbCrLf & vbCrLf & _
                 "办理充值老师:" & a

        
        End If

End Sub