问题
I get an XML from website into a string strXML. Then I create an XML DOM document:
Dim xmlDoc As MSXML2.DOMDocument
Dim xmlElement As MSXML2.IXMLDOMElement
Dim xmlNode As MSXML2.IXMLDOMElement
Set xmlDoc = New MSXML2.DOMDocument
xmlDoc.loadXML (strXML)
DisplayNode xmlDoc.childNodes
Now the DisplayNode is a recursive method which calls itself for every line in the XML data:
Public Sub DisplayNode(ByRef Nodes As MSXML2.IXMLDOMNodeList)
Dim xNode As MSXML2.IXMLDOMNode
For Each xNode In Nodes
If xNode.nodeType = NODE_TEXT Then
Debug.Print xNode.parentNode.nodeName & " = " & xNode.nodeValue
Else
If xNode.parentNode.nodeName = "data" Then Debug.Print "*** NEW RECORD ***"
End If
If xNode.hasChildNodes Then
DisplayNode xNode.childNodes
Debug.Print "> recursive call - next field<"
End If
Next xNode
End Sub
The problem here is how to enter the XML data from a recursive loop into a recordest. If it was just a normal loop it would be easy, but a recursive loop cannot keep a truck of which field and which record is being entered as it is continuously passing its parameters.
One way that I can see to do it at the moment is to create a collection of objects which contain two strings. I could add all data nodes to this collection and then use a loop to move data from the collection into a recordset.
However, I wonder if it is possible to read XML string without using a recursive method just plain loops, or perhaps there is a different way of loading a custom XML file/string into a recordset.
This is the output of DisplayNode:
*** NEW RECORD***
EVENTID = 75098
> recursive call <
DESCRIPTION = Pack
> recursive call <
NAME = John Smith
> recursive call <
CUSTOMERID = 37684
> recursive call <
TRADER = MY COMPANY
> recursive call <
ADDRESS = Flat A
SOUTHILL PARK
LONDON
> recursive call <
> recursive call <
*** NEW RECORD***
.
.
.
repeats
EDIT: Apparently it is possible to pass a reference to a recordset between the recursive calls and the recordset will preserve its state so one by one field can be entered and the record saved. See the full solution below.
回答1:
You could use MSXML2.IXMLDOMNode.selectNode() to explicitly select nodes via xpath expressions? This way, you keep track of which fields/records are entered from outside.
回答2:
Here is a working solution. The method below needs to be in the Access Form which will display the XML data. The text fields in the form should be set that their 'Contol source' has the same names as the fields addedd in the ADODB recordset.
Private Sub GetXMLdata()
On Error GoTo ErrorHandler
'************************************************************
'CREATE AN ADODB RECORDSET - this recordset is in memory only it does not create a table in the database file
'This requires a reference addedd in TOOLS > References, Microsfot ActiveX Data Object , the latest version...
'************************************************************
Dim rs As ADODB.Recordset
Dim fld As ADODB.field
Dim strXML As String
Set rs = New ADODB.Recordset
With rs
.Fields.Append "EventID", adVarChar, 15, adFldMayBeNull
.Fields.Append "JobDescription", adVarChar, 255, adFldMayBeNull
.Fields.Append "FullName", adVarChar, 100, adFldMayBeNull
.Fields.Append "CustomerID", adVarChar, 15, adFldMayBeNull
.Fields.Append "CustomerAddress", adVarChar, 255, adFldMayBeNull
.Fields.Append "Town", adVarChar, 64, adFldMayBeNull
.Fields.Append "PostCode", adVarChar, 20, adFldMayBeNull
.CursorType = adOpenKeyset
.CursorLocation = adUseClient
.LockType = adLockPessimistic
.Open
End With
'**********************************************************
'DOWNLOAD XML DATA
'**********************************************************
Dim obj As MSXML2.ServerXMLHTTP
Set obj = New MSXML2.ServerXMLHTTP
bj.Open "GET", "http://www.myserver.com/mydata.xml", False
'in case you are sending a form *POST* or XML data to a SOAP server set content type
obj.setRequestHeader "Content-Type", "text/xml"
obj.send
Dim status As Integer
status = obj.status
If status >= 400 And status <= 599 Then
Debug.Print "Error Occurred : " & obj.status & " - " & obj.statusText
End If
'**********************************************************
'CREATE XML DOM DOCUMENT
'**********************************************************
Dim xmlDoc As MSXML2.DOMDocument
Dim xmlElement As MSXML2.IXMLDOMElement
Dim xmlNode As MSXML2.IXMLDOMElement
Set xmlDoc = New MSXML2.DOMDocument
xmlDoc.loadXML (obj.responseText)
'**********************************************************
'LOAD XML DATA INTO THE RECORDSET
'**********************************************************
LoadNodesIntoRs xmlDoc.childNodes, rs, 0
If rs.recordCount > 0 Then
rs.Update
'BOUND THIS RECORDSET TO THE FORM
Set Me.Recordset = rs
End If
Exit Sub
ErrorHandler:
MsgBox Err.Description
End Sub
The method below enters one by one field into the passed recordset. Because MSXML2 seems to skip empty tags like <something></something> each tag name with data needs to be checked by name and entered into an appropriate recordset field.
Public Sub LoadNodesIntoRs(ByRef nodes As MSXML2.IXMLDOMNodeList, rs As ADODB.Recordset, recordCount As Integer)
Dim xNode As MSXML2.IXMLDOMNode
Dim fieldIndex As Integer
For Each xNode In nodes
If xNode.nodeType = NODE_TEXT Then
'a field - actual data
'note that MSXML2 will skip any node which contain no data like <COMPANY></COMPANY>
Select Case xNode.parentNode.nodeName
Case "EVENTID"
fieldIndex = 0
Case "DESCRIPTION"
fieldIndex = 1
Case "NAME"
fieldIndex = 2
Case "CUSTOMERID"
fieldIndex = 3
Case "ADDRESS"
fieldIndex = 4
Case "TOWN"
fieldIndex = 5
Case "POSTALCODE"
fieldIndex = 6
End Select
rs(fieldIndex) = xNode.nodeValue
Else
'CHECK FOR THE NODE WHICH CONTAINS THE SETS OF DATA'
If xNode.parentNode.nodeName = "data" Then
'next record
If recordCount > 0 Then
'save previous record
rs.Update
fieldIndex = 0
End If
rs.AddNew
recordCount = recordCount + 1
End If
End If
If xNode.hasChildNodes Then
'recurive call for the next node
LoadNodesIntoRs xNode.childNodes, rs, recordCount
End If
Next xNode
End Sub
来源：https://stackoverflow.com/questions/7091162/access-vba-how-to-download-xml-file-and-enter-its-data-into-a-recordset