mysql - 我的代码不起作用。我做对了吗？

Question

我想要实现的是:

我将选择应该更新哪一列，这就是为什么我正在试验我的代码但没有成功，现在我想我需要一些帮助。

Dim btnup="col1"
Dim btnval="1"
Try
    Dim mysqlconn As New MySqlConnection
    Dim conStr As String
    conStr = "Server=localhost; user id=root; password=; database=dnc_floor"
    mysqlconn = New MySqlConnection(conStr)
    mysqlconn.Open()
    Dim update As String
    Dim cmd As MySqlCommand
    update = "Update floor set ='" & btnup & "'=btnval  where ID='" & Day & "'"
    cmd = New MySqlCommand(update, mysqlconn)
    cmd.ExecuteNonQuery()
    Dim check As String = cmd.ExecuteNonQuery()
    MsgBox("Saved")
    mysqlconn.Close()
Catch ex As MySqlException
    MessageBox.Show("Check your connection with your database")
Finally
    mysqlconn.Dispose()
End Try

Answer 1

更新字符串可能是错误的。也许你想到了这一点:

  update = "Update floor set " & btnup & " ='" & btnval & "'  where ID= '" & Day & "'"