Olingo和Excel

Question

我已下载Olingo server sample（Odata4），已编译并部署在我的本地tomcat上

浏览网址http://localhost:8080/odata-server-sample/cars.svc/我得到

<?xml version="1.0" encoding="UTF-8"?>
<app:service xmlns:app="http://www.w3.org/2007/app" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:metadata="http://docs.oasis-open.org/odata/ns/metadata" metadata:context="$metadata">
   <app:workspace>
      <atom:title>olingo.odata.sample.Container</atom:title>
      <app:collection href="Cars" metadata:name="Cars">
         <atom:title>Cars</atom:title>
      </app:collection>
      <app:collection href="Manufacturers" metadata:name="Manufacturers">
         <atom:title>Manufacturers</atom:title>
      </app:collection>
   </app:workspace>
</app:service>

我不知道OData协议，但它似乎合法......

现在，如果我使用PowerQuery将其提供给Excel 2016： 数据＆gt;新查询＆gt;来自其他来源＆gt;来自OData Feed

我收到错误Invalid URI: The hostname could not be parsed.

如果我使用这个vba代码：

Option Explicit

' References that need to be added:
' Microsoft XML, v6.0
' Microsoft Scripting Runtime

Const ODataErrorFirst As Long = 100
Const ODataCannotReadUrlError As Long = ODataErrorFirst + 1
Const ODataParseError As Long = ODataErrorFirst + 2

Sub test()
    ODataReadUrl ("http://localhost:8080/odata-server-sample/cars.svc/")
End Sub

' Given a URL, reads an OData feed or entry into an XML document.
Function ODataReadUrl(ByVal strUrl As String) As MSXML2.DOMDocument60
    Dim objXmlHttp As MSXML2.XMLHTTP60
    Dim objResult As MSXML2.DOMDocument60
    Dim strText As String

    ' Make a request for the URL.
    Set objXmlHttp = New MSXML2.XMLHTTP60
    objXmlHttp.Open "GET", strUrl, False
    objXmlHttp.send

    If objXmlHttp.Status <> 200 Then
        Err.Raise ODataCannotReadUrlError, "ODataReadUrl", "Unable to get '" & strUrl & "' – status code: " & objXmlHttp.Status
    End If

    ' Get the result as text.
    strText = objXmlHttp.responseText
    Set objXmlHttp = Nothing

    ' Create a document from the text.
    Set objResult = New MSXML2.DOMDocument60
    objResult.LoadXML strText
    If objResult.parseError.ErrorCode <> 0 Then
        Err.Raise ODataParseError, "ODataReadUrl", "Unable to load '" & strUrl & "' – " & objResult.parseError.reason
    End If

    Set ODataReadUrl = objResult
End Function

我得到Not valid at root level.（在我的意大利语Excel中：Non valido al primo livello del documento.）

这是什么意思？ Olingo与excel不兼容？

Answer 1

我已经遵循了一些建议，并提出了一个工作样本

您可以在此处找到修补后的代码：https://github.com/lelmarir/olingo-odata4/commit/8a947d3b7afab88c04177bfb361e9689ea91defc

参考文献：

• https://issues.apache.org/jira/browse/OLINGO-1025
• https://issues.apache.org/jira/browse/OLINGO-758

Answer 2

PowerQuery正在尝试读取OData Feed，但您提供的URL是服务文档的URL。

http://localhost:8080/odata-server-sample/cars.svc/

您需要将Feed的网址传递给它：

http://localhost:8080/odata-server-sample/cars.svc/Cars

或

http://localhost:8080/odata-server-sample/cars.svc/Manufacturers

Feed是一个条目列表 - 它是实际数据。服务文档列出了不同的可用供稿，以便客户可以发现它们。