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Figure 3-8 An example Visual Basic client using data binding to display employee orders
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On the server side, I added a stub layer written as a simple ASP page that receives the SOAP message, invokes the COM component then serializes and returns the Recordset The server COM component did not have to change at all The client had to change to bind to the proxy class instead of directly to a Recordset, this change required exactly 3 lines of code The existing server-side COM component is called RecordsetExample and exposes a method called GetEmpOrders which takes in an employee id and queries the Northwind Orders table for all orders with the given employee id and returns the result in an ADO Recordset: Public Function GetEmpOrders(ByVal EmpId As Long) As Recordset To expose the COM component as a Web service, I wrote the ASP page shown in Listing 3- 7 which uses only MSXML 40 and ADO 26
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Listing 3-7 An ASP page to expose an existing COM component as a Web service (VBWSBook\3 \EmployeeOrders\EmpOrdersasp)
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<%@Language="VBScript" %> <% CONST adPersistXML=1
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Dim NS Dim requestDoc Dim EmpId Dim RpcEx
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Dim rs
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On Error Resume Next
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NS="http://schemaslearnxmlwscom/employeeOrders" Set requestDoc=ServerCreateObject("MSXML2DOMDocument") 'Load the SOAP message requestDocasync=false If Not requestDocLoad(Request) Then ResponseWrite "Error loading request doc " & ErrDescription ResponseEnd Else Call requestDocsetProperty("SelectionNamespaces", _ "xmlns:vbws='" & NS & "'") End If
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'get the employee id EmpId=requestDocselectSingleNode("//vbws:GetEmpOrders/EmpId")text If Errnumber <> 0 Then ResponseWrite "Error retrieving employee id: " & _ ErrDescription End If
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Set RpcEx =ServerCreateObject("RPCExamplesRecordsetExample") Set rs=RpcExGetEmpOrders(EmpId) If Errnumber <> 0 Then ResponseWrite "Error retrieving data: " & ErrDescription
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End If 'write the response WriteSOAPResponse("<vbws:GetEmpOrdersResponse xmlns:vbws='" & _ NS & "'" _ "soapenv:encodingStyle='http://schemasxmlsoaporg/soap/encoding/'>" & _ "<theReturn>" & Rs2Xml(rs) & _ "</theReturn></vbws:GetEmpOrdersResponse>") If Errnumber <> 0 Then ResponseWrite "Error serializing data: " & ErrDescription End If Function Rs2Xml(rs) Dim doc Set doc = ServerCreateObject("MSXML2DOMDocument") rsSave doc, adPersistXML Rs2Xml = "<![CDATA[" & docxml & "]]>" End Function Sub WriteSOAPResponse(msg) ResponseContentType="text/xml" ResponseCharSet="iso-8859-1" ResponseWrite "<soapenv:Envelope " & _ "xmlns:xsi='http://wwww3org/2001/XMLSchema-instance'" & _ " xmlns:xsd='http://wwww3org/2001/XMLSchema'" & _ " xmlns:soapenv='http://schemasxmlsoaporg/soap/envelope/'>" & _ "<soapenv:Body>" ResponseWrite msg ResponseWrite "</soapenv:Body></soapenv:Envelope>" End Sub %>
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I start by loading the request message in a DOMDocument named requestDoc I then retrieve the employee id using XPath to select the element called EmpId I then instantiate an object from the example component RPCExamplesRecordsetExample and call GetEmpOrders passing it the employee id to get back an ADO Recordset I then call WriteSOAPResponse passing it the contents of <soapenv:Body> as in the example response message in listing 3-6 To serialize the Recordset, I wrote a function called Rs2Xml which creates a DOMDocument and passes it to rsSave then wraps the output XML in a CDATA section Obviously, all the serialization heavy lifting is done by the Recordset itself My legacy COM component is now exposed as a Web service and ready to be invoked via SOAP RPC/encoded messages Listing 3-8 shows the corresponding request and response SOAP RPC/Section 5 encoded messages
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Listing 3-8 Example request message passing an employee id and the response message containing an ADO Recordset with employee orders
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POST /vbwsbook/chapter3/EmployeeOrders/EmpOrdersasp HTTP/10 SOAPAction: "" Content-Type: text/xml Accept-Language: en-us Content-Length: 351 Accept: */* User-Agent: Mozilla/40 (compatible; Win32; WinHttpWinHttpRequest5) Host: VBWSServer Connection: Keep-Alive
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<soapenv:Envelope xmlns:xsi="http://wwww3org/2001/XMLSchema-instance" xmlns:xsd="http://wwww3org/2001/XMLSchema" xmlns:soapenv="http://schemasxmlsoaporg/soap/envelope/"> <soapenv:Body> <vbws:GetEmpOrders xmlns:vbws="http://schemaslearnxmlwscom/employeeOrders" soapenv:encodingStyle="http://schemasxmlsoaporg/soap/encoding/"> <EmpId xsi:type="xsd:int">3</EmpId> </vbws:GetEmpOrders> </soapenv:Body>
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</soapenv:Envelope>
HTTP/11 200 OK Server: Microsoft-IIS/51 Date: Mon, 03 Sep 2001 13:52:26 GMT Connection: keep-alive Connection: Keep-Alive Content-Length: 49198 Content-Type: text/xml; Charset=iso-8859-1 Cache-control: private <soapenv:Envelope xmlns:xsi='http://wwww3org/2001/XMLSchema-instance' xmlns:xsd='http://wwww3org/2001/XMLSchema' xmlns:soapenv='http://schemasxmlsoaporg/soap/envelope/'> <soapenv:Body> <vbws:GetEmpOrdersResponse xmlns:vbws='http://schemaslearnxmlwscom/employeeOrders' soapenv:encodingStyle='http://schemasxmlsoaporg/soap/encoding/'> <theReturn xsi:type='xsd:string'> <![CDATA[ <xml xmlns:s="uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882" xmlns:dt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882" xmlns:rs="urn:schemas-microsoft-com:rowset" xmlns:z="#RowsetSchema"> </xml> ]]> </theReturn>
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</vbws:GetEmpOrdersResponse> </soapenv:Body> </soapenv:Envelope>
Looking at listing 3-8, you ll see that the request message uses HTTP POST with SOAPAction "" because the Web service does not rely on SOAPAction Within the request message s <soapBody>, there s a single element that must have the same name as the method, ie GetEmpOrders This element s namespace is called the operation namespace and is determined by the creator of the Web service, which in this example, I decided to make http://schemaslearnxmlwscom/employeeOrders The soapenv:encodingStyle attribute indicates the type of encoding used for the method parameters, with the value http://schemasxmlsoaporg/soap/encoding/ indicating SOAP Section 5 encoding<GetEmpOrders> must contain an element for each parameter of the method being invoked with the same name as the parameter, EmpId in this case Note that according to SOAP Section 5 rules, these elements must not belong to any namespace, so <EmpId> has no namespace prefix or default namespace declaration EmpId is a VB Long which maps to an XSD int and, when serialized according to Section 5 encoding rules, comes out as the string 3 Although this is simple and quite intuitive, it is important to standardize to enable interoperability among different SOAP implementations Otherwise, someone might decide to serialize the integer value 3 as 0x03 which would be incompatible with my Web service Note that xsi:type="xsd:int" is used to indicate the type of <EmpId> which might be helpful for the server when it tries to deserialize this parameter xsi:type is not the only way to specify parameter types nor is it required You will learn in 4 how an XSD schema as part of a WSDL document serves the same purpose and can be used instead of inline type information Still on listing 3-8, the response begins with HTTP status code 200 which indicates that the RPC call completed successfully Within <soapenv:Body> there s one element which, only by convention, is named after the method name with "Response" appended to it, ie <GetEmpOrdersResponse> The method s return value is repesented by an element that must be the first child of <GetEmpOrdersResponse> The name of the return value element, eg <theReturn> is insignificant In this example, the method call returns an ADO Recordset so I use its Save method to serialize it to XML I cannot however just stuff the serialized Recordset into <theReturn> because the result would be invalid according to Section 5 encoding rules Instead, I enclose it in a CDATA section making it appear as if it were just a string with no XML markup, hence as far as SOAP is concerned, the return value s type is simply a string, ie xsi:type="xsd:string" On the client side, the proxy will extract this string, loaded in a DOMDocument , then deserialize or rehydrate an ADO Recordset from it and return it to the client application which doesn t know how this Recordset was created or where it came from Listing 3-9 shows the proxy class used by the client to invoke this Web service This class relies on SOAPSender to form and send the SOAP request message It then parses the response document, extracts the XML that represents the serialized Recordset and loads it into a new Recordset Listing 3-7 The Web service proxy class which acts as a data source (VBWSClientCode\chapter3 \EmployeeOrdersClient\CEmployeeOrderscls)
Private Sub Class_GetDataMember(DataMember As String, Data As Object) On Error GoTo eh Dim soapMsg As MSXML2DOMDocument Dim doc As MSXML2DOMDocument Dim vbws As SOAPSender