Question

我一直在尝试获取我在数据库中的记录，但它还没有正常工作。试图搜索一些代码。它对他们有用，但对我不起作用。

 Try
        Dim cn As New MySqlConnection(ConnectionString)
        Dim cmd As New MySqlCommand("SELECT CONCAT(Surname, ', ', FirstName) as 'Name' FROM tbl_ClassList", cn)
        Dim reader As MySqlDataReader = cmd.ExecuteReader

        Do While reader.Read
            Console.WriteLine(reader.Item("Name").ToString())
        Loop

        reader.Close()
        cmd.Dispose()
        cn.Close()
    Catch ex As Exception
        MsgBox("Wrong")
    End Try

Answer 1

您忘了打开连接：

Dim cn As New MySqlConnection(ConnectionString)
cn.Open()

VB.net - 从MySQL数据库中获取数据行

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