压缩数据库错误



我有一个程序,可以删除Access2010数据库中任何超过特定日期的数据,然后压缩数据库。程序的删除部分运行良好,但当我尝试压缩它时,会出现错误"无效参数"。以下是我的代码:

    'Deleting anything older than chosen before databse is compacted.
    Dim DateA As Date = Date.Now
    Dim DateB As String
    Dim ConnString As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:ForteFortedb.accdb"
    Dim ParentCNN = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:ForteFortedb.accdb"
    Dim CloneCNN = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:ForteTemp.accdb"
    Dim cnn As New OleDbConnection(ConnString)
    Dim sql As String
    'Formatting the date to make it 7 days into the past.
    DateB = Format(DateA.AddDays(ApplicationPropertiesWindow.DeleteFilebox.SelectedIndex + 1), "MM/dd/yy")
    cnn.Open()
    'Delete everything from b_forte where proddate is less than date - chosen time.    
    sql = "DELETE * FROM b_forte WHERE ProdDate < #" & DateB & "#"
    Dim Command = New OleDb.OleDbCommand(sql, cnn)
    Command.ExecuteNonQuery()
    cnn.Close()
    'Compacting the databse
    Try
        Dim JrO As New JRO.JetEngine
        cnn.Open()
        JrO.CompactDatabase(ParentCNN, CloneCNN)
        If System.IO.File.Exists("C:ForteTemp.accdb") Then
            System.IO.File.Delete("C:ForteFortedb.accdb")
            Rename("C:ForteTemp.accdb", "C:ForteFortedb.accdb")
            Logging("Database compacted.")
            cnn.Close()
        End If
    Catch ex As Exception
        MainTextBox.AppendText(Environment.NewLine & "Database Compression Failure :" & vbCr & ex.Message)
    End Try

我使用的是vb.net 2010,访问2010时数据库上没有密码。

CompactDatabase的参数只是路径和文件名,而不是连接信息。

BTWVB.NET不区分大小写,所以我不会重复使用JRO:

Dim JrO As New JRO.JetEngine

它可能会按原样工作,但以后读起来会很困惑,而且可能会在某个阶段引发冲突。

我从@Andy G那里发现这是来自CompactDatabase的连接信息。我必须更改代码中的信息是:CloneCNN。字符串为"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:ForteTemp.accdb" ,为了修复无效参数错误消息,我在CloneCNN的末尾添加了;Jet OLEDB:Engine Type=5

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