xml - 将 XML 文件导入具有多个表的 Access DB

Question

我有一堆(平面)XML 文件，例如:

<?xml version="1.0" encoding="UTF-8"?>
<SomeName>   
  <UID>
    ID123
  </UID>
  <Node1> 
    DataA 
 </Node1>   
 <Node2> 
    DataB 
 </Node2>   
  <Node3> 
    DataC 
 </Node3>   
  <AnotherNode1> 
    DataD 
 </AnotherNode1> 
  <AnotherNode2> 
    DataE 
 </AnotherNode2> 
  <AnotherNode3> 
    DataF 
 </AnotherNode3> 
 <SingleNode> 
    DataG 
 </SingleNode> 
</SomeName>   

现在我的实际XML文件节点太多，无法导入到一个表中(由于255列的限制)，所以我需要将数据拆分到多个表中。我已经手动创建了表，所以现在所有 Access 都必须将节点名称与每个表中的列匹配并复制数据。

它只对一个名为“SomeName”的表执行此操作，但不会影响所有其他表。

我不确定如何获得将我的 XML 文件正确导入所有表的权限。我也已经尝试在每个表中创建 UID 字段并将它们链接起来(因为 UID 对于每个 XML 数据集都是唯一的)，但是这也让 Access 不受影响。

我试图找到有关此问题的任何信息，但到目前为止一无所获。

如果有任何帮助或指点，我将不胜感激。

Answer 1

由于您需要超过 255 个字段，因此您必须使用代码来完成此操作。您可以将 XML 加载到 MSXML2.DOMDocument 中，收集节点值的子集，构建 INSERT 语句，然后执行它。

这是我针对您的示例数据测试的程序。这很丑陋，但它有效。修改 strTagList、strFieldList、strTable 和 cintNumTables 后取消注释 CurrentDb.Execute 行 并查看 INSERT 语句。如果要加载的表超过 2 个，请添加额外的 Case block 。

Public Sub Grinner(ByRef pURL As String)
    Const cintNumTables As Integer = 2
    Dim intInnerLoop As Integer
    Dim intOuterLoop As Integer
    Dim objDoc As Object
    Dim objNode As Object
    Dim strFieldList As String
    Dim strMsg As String
    Dim strSql As String
    Dim strTable As String
    Dim strTag As String
    Dim strTagList As String
    Dim strUID As String
    Dim strValueList As String
    Dim varTags As Variant

On Error GoTo ErrorHandler

    Set objDoc = GetXMLDoc(pURL)
    Set objNode = objDoc.getElementsByTagName("UID").Item(0)
    strUID = objNode.Text

    For intOuterLoop = 1 To cintNumTables
        Select Case intOuterLoop
        Case 1
            strTable = "Table1"
            strTagList = "Node1,Node2,Node3,AnotherNode1"
            strFieldList = "UID, N1, N2, N3, A1"
        Case 2
            strTable = "Table2"
            strTagList = "AnotherNode2,AnotherNode3,SingleNode"
            strFieldList = "UID, A2, A3, SN"
        Case Else
            'oops!
            strTable = vbNullString
        End Select
        If Len(strTable) > 0 Then
            varTags = Split(strTagList, ",")
            strValueList = "'" & strUID & "'"
            For intInnerLoop = 0 To UBound(varTags)
                strTag = varTags(intInnerLoop)
                Set objNode = objDoc.getElementsByTagName(strTag).Item(0)
                strValueList = strValueList & ", '" & _
                    Replace(objNode.Text, "'", "''") & "'"
            Next intInnerLoop
            strSql = "INSERT INTO " & strTable & " (" & _
                strFieldList & ")" & vbNewLine & _
                "VALUES (" & strValueList & ");"
            Debug.Print strSql
            'CurrentDb.Execute strSql, dbFailOnError
        End If
    Next intOuterLoop

ExitHere:
    Set objNode = Nothing
    Set objDoc = Nothing
    On Error GoTo 0
    Exit Sub

ErrorHandler:
    strMsg = "Error " & Err.Number & " (" & Err.Description _
        & ") in procedure Grinner"
    MsgBox strMsg
    GoTo ExitHere
End Sub

Public Function GetXMLDoc(pURL) As Object
    ' early binding requires reference, Microsoft XML
    'Dim objDoc As MSXML2.DOMDocument30
    'Dim objParseErr As MSXML2.IXMLDOMParseError
    'Set objDoc = New MSXML2.DOMDocument30
    ' late binding; reference not required
    Dim objDoc As Object
    Dim objParseErr As Object
    Dim strMsg As String

On Error GoTo ErrorHandler

    Set objDoc = CreateObject("Msxml2.DOMDocument.3.0")
    objDoc.async = False
    objDoc.validateOnParse = True
    objDoc.Load pURL
    If (objDoc.parseError.errorCode <> 0) Then
       Set objParseErr = objDoc.parseError
       MsgBox ("You have error " & objParseErr.reason)
       Set objDoc = Nothing
    End If

ExitHere:
    Set objParseErr = Nothing
    Set GetXMLDoc = objDoc
    On Error GoTo 0
    Exit Function

ErrorHandler:
    strMsg = "Error " & Err.Number & " (" & Err.Description _
        & ") in procedure GetXMLDoc"
    MsgBox strMsg
    Set objDoc = Nothing
    GoTo ExitHere
End Function

以下是我发现对 VBA/XML/DOM 有帮助的 4 个链接:

• Google: vba xml dom
• msdn: A Beginner's Guide to the XML DOM
• msdn: Use the XML Object Model
• Stack Overflow: How to parse XML in VBA