mysql - 如何加速 ADODB 连接

Question

我正在运行下面的代码以将数据从我的 Access 数据库检索到 Excel。代码执行大约需要 1 分钟。目前大约有 500 条记录，8 列。我可以做些什么来修改我的代码以加快运行速度吗？

Sub sync_Data()
    Application.ScreenUpdating = False
    Application.EnableEvents = False
    Application.Calculation = xlCalculationManual

    Dim cn As ADODB.Connection, rs As ADODB.Recordset
    Dim mysqlSt As String
    Dim rowindex As Long

    mysqlSt = "SELECT pbsclients.client, pbsclients.priority, pbsclients.source, pbsclients.lastcontact, pbsclients.result, pbsclients.nextsteps, pbsclients.attempts, pbsclients.notes FROM pbsclients; "

    Set cn = New ADODB.Connection
    With cn
        .ConnectionString = con1
        .Open
    End With

    rowindex = 2
    Set rs = New ADODB.Recordset
    rs.Open mysqlSt, cn, adOpenDynamic, adLockOptimistic

    While Not rs.EOF
        Sheet3.Cells(rowindex, 1) = rs!client
        Sheet3.Cells(rowindex, 2) = rs!Priority
        Sheet3.Cells(rowindex, 3) = rs!Source
        Sheet3.Cells(rowindex, 4) = rs!lastcontact
        Sheet3.Cells(rowindex, 5) = rs!result
        Sheet3.Cells(rowindex, 6) = rs!nextsteps
        Sheet3.Cells(rowindex, 7) = rs!attempts
        Sheet3.Cells(rowindex, 8) = rs!Notes

        rowindex = rowindex + 1
        rs.MoveNext
    Wend

    rs.Close
    Set rs = Nothing
    cn.Close
    Set cn = Nothing
    Exit Sub

    Application.ScreenUpdating = True
    Application.EnableEvents = True
    Application.Calculation = xlCalculationAutomatic
End Sub

Answer 1

这是我的代码的工作版本，运行和检索大约需要 2 秒，而我上面的代码需要 45 秒 - 1 分钟。

Sub sync_Data()
    Application.ScreenUpdating = False
Application.EnableEvents = False
Application.Calculation = xlCalculationManual

Dim cn As ADODB.Connection, rs As ADODB.Recordset
Dim mysqlSt As String
Dim rowindex As Long


mysqlSt = "SELECT pbsclients.client, pbsclients.priority, pbsclients.source, pbsclients.lastcontact, pbsclients.result, pbsclients.nextsteps, pbsclients.attempts, pbsclients.notes FROM pbsclients WHERE Id <> 0 AND pbsclients.branch = '" & Sheet3.Range("Z1") & "'"

Set cn = New ADODB.Connection

With cn
    .ConnectionString = con1
    .Open
    End With
    rowindex = 2
    Set rs = New ADODB.Recordset
    rs.Open mysqlSt, cn, adOpenDynamic, adLockOptimistic

    Do While Not rs.EOF

    Sheet3.Range("A2").CopyFromRecordset rs

    Loop

    rs.Close
      cn.Close
    Set rs = Nothing

    Set cn = Nothing
    Exit Sub
Application.ScreenUpdating = True
Application.EnableEvents = True
Application.Calculation = xlCalculationAutomatic
End Sub