Question

我有SCN：

localstack

我可以将其转换为时间戳记：

worker_startup

当我要混合使用这两种方法时，请选择“我收到错误消息”：

SELECT TIMESTAMP_TO_SCN(SYSTIMESTAMP) SCN FROM DUAL;

SELECT SCN_TO_TIMESTAMP(6480157) FROM DUAL;

Answer 1

请使用

Private Sub Cashier_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    GetItemName()
End Sub

Public Sub GetItemName()
    Dim dt As New DataTable
    Using cn As New MySqlConnection("Your connection string")
        Using cmd As New MySqlCommand("Select ItemName From menuitem", cn)
            cn.Open()
            dt.Load(cmd.ExecuteReader)
        End Using
    End Using
    Dim arr As String() = dt.AsEnumerable().Select(Function(x) x.Field(Of String)("ItemName")).ToArray()
    ListBox2.Items.AddRange(arr)
End Sub

Answer 2

@ F.Madsen给出了正确和最简单的答案，但仅出于说明目的，您可以按照自己的逻辑得出结果：

SELECT SCN_TO_TIMESTAMP(SCN) FROM
(
  SELECT (TIMESTAMP_TO_SCN(SYSTIMESTAMP)) SCN FROM DUAL
);

SCN到TimeStamp-错误的表达？

2 个答案: