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SOAP is used to exchange data between the web service and its clients. It encodes both the data and the request. The easiest way to understand SOAP is by looking at an example of how it is generated. The WSDL file in Listing 19-1 defines an operation called Demo, which has one input parameter that takes a string. If you were to call that method, the SOAP-formatted request would look like Listing 19-2. Listing 19-2. An Encoded SOAP Request < xml version="1.0" encoding="UTF-8" > <SOAP-ENV:Envelope xmlns:SOAP-ENV=http://schemas.xmlsoap.org/soap/envelope/ xmlns:ns1="http://localhost/demo" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" > <SOAP-ENV:Body> <ns1:Demo> <param1 xsi:type="xsd:string">abcdefg</param1> </ns1:Demo> </SOAP-ENV:Body> </SOAP-ENV:Envelope> This message contains a SOAP envelope, which encapsulates the method call. The Envelope element assigns the ns1 prefix to your targetNamespace in order to give it a distinct namespace. In the body, it will call an operation using this prefix, passing along the param1 parameter defined by the WSDL and with the data provided by the application. The PHP equivalent method call would look like $ns1->Demo('abcdefg'). The service will then respond with a SOAP datagram that looks like Listing 19-3. Listing 19-3. A SOAP Response < xml version="1.0" encoding="UTF-8" > <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="http://localhost/demo" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" >

Before you go any further, make sure you ve imported the SystemDataSqlClient namespace, which allows you to use the SQL Server provider to retrieve data protected void Page_Load(Object sender, EventArgs e) { if (!thisIsPostBack) { // Define the ADONET objects for selecting products from the database string selectSQL = "SELECT ProductName, ProductID FROM Products"; SqlConnection con = new SqlConnection(connectionString); SqlCommand cmd = new SqlCommand(selectSQL, con); // Open the connection conOpen(); // Define the binding lstProductDataSource = cmdExecuteReader(); lstProductDataTextField = "ProductName"; lstProductDataValueField = "ProductID"; // Activate the binding thisDataBind(); conClose(); // Make sure nothing is currently selected in the list box lstProductSelectedIndex = -1; } } Once again, the list is only filled the first time the page is requested (and stored in view state automatically) If the page is posted back, the list keeps its current entries.

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Interestingly, delete operations rarely succeed with the records in the pubs database, because they have corresponding child records linked in another table of the pubs database. Specifically, each author can have one or more related book titles. Unless the author s records are removed from the TitleAuthor table first, the author cannot be deleted. Because of the careful error handling used in the previous example, this problem is faithfully reported in your application (see Figure 15-15) and doesn t cause any real problems.

This reduces the amount of database work, and keeps the page working quickly and efficiently You should also note that this page doesn t attempt to deal with errors If you were using it in a real application, you d need to use the exception handling approach demonstrated in 14..

Figure 15-15. A failed delete attempt To get around this limitation, you can use the Create New and Insert New buttons to add a new record and then delete this record. Because this new record won t be linked to any other records, its deletion will be allowed.

The actual database code is similar to what was used in the previous chapter. The example uses a Select statement but carefully limits the returned information to just the ProductName and ProductID fields, which are the only pieces of information it will use. The resulting window lists all the products defined in the database, as shown in Figure 15-9.

When you use disconnected data access, you keep a copy of your data in memory using the DataSet. You connect to the database just long enough to fetch your data and dump it into the DataSet, and then you disconnect immediately.

<SOAP-ENV:Body> <ns1:DemoResponse> <Result xsi:type="xsd:string"> Request received with param1 = abcdefg </Result> </ns1:DemoResponse> </SOAP-ENV:Body> </SOAP-ENV:Envelope> The function that generated this response looks like Listing 19-4. Listing 19-4. A Demo Function function Demo($param1) { return 'Request received with param1 = '. $param1; }

Figure 15-9. Product choices The drop-down list enables AutoPostBack, so as soon as the user makes a selection, a lstProduct.SelectedItemChanged event fires. At this point, your code performs the following tasks: It reads the corresponding record from the Products table and displays additional information about it in a label. In this case, a Join query links information from the Products and Categories tables. The code also determines what the category is for the current product. This is the piece of information it will allow the user to change.

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