Excel vba xml解析性能

Question

我正在研究excel中的一些输入数据,将其解析为xml并使用它来运行SQL存储过程,但我在xml解析时遇到了性能问题.输入表看起来像这样:

Dates_|_Name1_Name2_Name3_..._NameX
Date1 |
Date2 |
. . . |
Date1Y|

我有一些代码循环遍历每个单元格并将数据解析为xml字符串,但即使对于大约300乘300网格,执行需要大约五分钟的时间,我希望使用可能的数据集数千列长.我尝试了一些方法来帮助加快速度,比如将数据读入Variant然后迭代,或者排除DoEvents但是我无法加快速度.以下是问题的代码:

Dim lastRow As Long
lRows = (oWorkSheet.Cells(Rows.Count, 1).End(xlUp).Row)
Dim lastColumn As Long
lCols = (oWorkSheet.Cells(1, Columns.Count).End(xlToLeft).Column)
Dim sheet As Variant
With Sheets(sName)
  sheet = .Range(.Cells(1, 1), .Cells(lRows, lCols))
End With
ReDim nameCols(lCols) As String

...

resultxml = "<DataSet>"
For i = 2 To rows
    resultxml = resultxml & "<DateRow>"

    For j = 1 To cols
        If Trim(sheet(i, j)) <> "" Then
            lResult = "<" & nameCols(j) & ">"
            rResult = "</" & nameCols(j) & ">"
            tmpValue = Trim(sheet(i, j))
            If IsDate(tmpValue) And Not IsNumeric(tmpValue) Then
                If Len(tmpValue) >= 8 Then
                    tmpValue = Format(tmpValue, "yyyy-mm-dd")
                End If
            End If
            resultxml = resultxml & lResult & tmpValue & rResult
            DoEvents
        End If
    Next j
    resultxml = resultxml & "</DateRow>"
Next i

resultxml = resultxml & "</DataSet>"

任何关于缩短运行时间的建议都将不胜感激.

Answer 1

考虑使用MSXML,您可以使用它与DOM方法来建立你的XML的XML API的全面W3C标准库(createElement,appendChild,setAttribute)而不将文本字符串.XML不是一个文本文件,而是一个带有编码和树结构的标记文件.Excel通过引用或后期绑定来配备MSXML COM对象,并且可以从Excel数据迭代地构建树,如下所示.

随着300行乘以12列随机日期,下面甚至没有花费一分钟(点击宏后几秒钟)它甚至使用嵌入式XSLT样式表打印原始输出带换行符和缩进(如果你不打印, MSXML将文档输出为一条长而连续的行.

输入

VBA (当然与实际数据一致)

Sub xmlExport()
On Error GoTo ErrHandle
    ' VBA REFERENCE MSXML, v6.0 '
    Dim doc As New MSXML2.DOMDocument60, xslDoc As New MSXML2.DOMDocument60, newDoc As New MSXML2.DOMDocument60
    Dim root As IXMLDOMElement, dataNode As IXMLDOMElement, datesNode As IXMLDOMElement, namesNode As IXMLDOMElement
    Dim i As Long, j As Long
    Dim tmpValue As Variant

    ' DECLARE XML DOC OBJECT '
    Set root = doc.createElement("DataSet")
    doc.appendChild root

    ' ITERATE THROUGH ROWS '
    For i = 2 To Sheets(1).UsedRange.Rows.Count

        ' DATA ROW NODE '
        Set dataNode = doc.createElement("DataRow")
        root.appendChild dataNode

        ' DATES NODE '
        Set datesNode = doc.createElement("Dates")
        datesNode.Text = Sheets(1).Range("A" & i)
        dataNode.appendChild datesNode

        ' NAMES NODE '
        For j = 1 To 12
            tmpValue = Sheets(1).Cells(i, j + 1)
            If IsDate(tmpValue) And Not IsNumeric(tmpValue) Then
                Set namesNode = doc.createElement("Name" & j)
                namesNode.Text = Format(tmpValue, "yyyy-mm-dd")
                dataNode.appendChild namesNode
            End If
        Next j

    Next i

    ' PRETTY PRINT RAW OUTPUT '
    xslDoc.LoadXML "<?xml version=" & Chr(34) & "1.0" & Chr(34) & "?>" _
            & "<xsl:stylesheet version=" & Chr(34) & "1.0" & Chr(34) _
            & "                xmlns:xsl=" & Chr(34) & "http://www.w3.org/1999/XSL/Transform" & Chr(34) & ">" _
            & "<xsl:strip-space elements=" & Chr(34) & "*" & Chr(34) & " />" _
            & "<xsl:output method=" & Chr(34) & "xml" & Chr(34) & " indent=" & Chr(34) & "yes" & Chr(34) & "" _
            & "            encoding=" & Chr(34) & "UTF-8" & Chr(34) & "/>" _
            & " <xsl:template match=" & Chr(34) & "node() | @*" & Chr(34) & ">" _
            & "  <xsl:copy>" _
            & "   <xsl:apply-templates select=" & Chr(34) & "node() | @*" & Chr(34) & " />" _
            & "  </xsl:copy>" _
            & " </xsl:template>" _
            & "</xsl:stylesheet>"

    xslDoc.async = False
    doc.transformNodeToObject xslDoc, newDoc
    newDoc.Save ActiveWorkbook.Path & "\Output.xml"

    MsgBox "Successfully exported Excel data to XML!", vbInformation
    Exit Sub

ErrHandle:
    MsgBox Err.Number & " - " & Err.Description, vbCritical
    Exit Sub

End Sub

产量

<?xml version="1.0" encoding="UTF-8"?>
<DataSet>
    <DataRow>
        <Dates>Date1</Dates>
        <Name1>2016-04-23</Name1>
        <Name2>2016-09-22</Name2>
        <Name3>2016-09-23</Name3>
        <Name4>2016-09-24</Name4>
        <Name5>2016-10-31</Name5>
        <Name6>2016-09-26</Name6>
        <Name7>2016-09-27</Name7>
        <Name8>2016-09-28</Name8>
        <Name9>2016-09-29</Name9>
        <Name10>2016-09-30</Name10>
        <Name11>2016-10-01</Name11>
        <Name12>2016-10-02</Name12>
    </DataRow>
    <DataRow>
        <Dates>Date2</Dates>
        <Name1>2016-06-27</Name1>
        <Name2>2016-08-14</Name2>
        <Name3>2016-07-08</Name3>
        <Name4>2016-08-22</Name4>
        <Name5>2016-11-03</Name5>
        <Name6>2016-07-28</Name6>
        <Name7>2016-08-23</Name7>
        <Name8>2016-11-01</Name8>
        <Name9>2016-11-01</Name9>
        <Name10>2016-08-11</Name10>
        <Name11>2016-08-18</Name11>
        <Name12>2016-09-23</Name12>
    </DataRow>
    ...