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In 14, you saw how to directly connect to a database, execute a query, loop through the records in the result set, and display them on a page. In this chapter, you ve already seen a simpler option with data binding, you can write your data access logic and then show the results in the page with no looping or control manipulation required. Now, it s time to introduce another convenience: data source controls. Amazingly enough, data source controls allow you to create data-bound pages without writing any data access code at all.

A DataSet can contain as many tables as you need, and you can even add relationships between the tables to better emulate the underlying relational data source. Unfortunately, you have no way to connect tables together automatically based on relationships in the underlying data source. However, you can add relations with a few extra lines of code, as shown in the next example. In the pubs database, authors are linked to titles using three tables. This arrangement (called a many-to-many relationship, shown in Figure 15-18) allows several authors to be related to one title and several titles to be related to one author. Without the intermediate TitleAuthor table, the database would be restricted to a one-to-many relationship, which would allow only a single author for each title. In an application, you would rarely need to access these tables individually. Instead, you would need to combine information from them in some way (for example, to find out what author wrote a given book). On its own, the Titles table indicates only the author ID. It doesn t provide additional information such as the author s name and address. To link this information together, you can use a special SQL Select statement called a Join query. Alternatively, you can use the features built into ADO.NET, as demonstrated in this section. The next example provides a simple page that lists authors and the titles they have written. The interesting thing about this page is that it s generated using ADO.NET table linking.

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Place the service.php file at http://localhost/service.php, or adjust the WSDL file to reflect your actual script location. The only place you define the service URL is in the WSDL file. When you run the client, a SOAP envelope is created and sent (posted) to service.php, which will then compute a response and return another SOAP envelope. To see what information is being sent back and forth, use the trace option, as Listing 19-7 demonstrates. Listing 19-7. Tracing SOAP Interaction < php $client = new SoapClient('demo.wsdl', array('trace'=>true)); $response = $client->Demo('abcdefg'); print($client->__getLastRequest()); print($client->__getLastResponse()); echo $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/"><SOAP-ENV:Body><ns1:Demo><param1 xsi:type= "xsd:string">abcdefg</param1></ns1:Demo></SOAP-ENV:Body></SOAP-ENV:Envelope> < 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:DemoResponse><Result xsi:type= "xsd:string">Request received with param1 = abcdefg</Result></ns1:DemoResponse> </SOAP-ENV:Body></SOAP-ENV:Envelope> Request received with param1 = abcdefg

Note As you ll soon see, often a gap exists between what you can do and what you should do. In most

Figure 15-18. A many-to-many relationship To start, the standard ADO.NET data access objects are created, including a DataSet. All these steps are performed in a custom CreateList() method, which is called from the Page.Load event handler so that the output is created when the page is first generated: ' Define ADO.NET objects. Dim selectSQL As String = "SELECT au_lname, au_fname, au_id FROM Authors" Dim con As New SqlConnection(connectionString) Dim cmd As New SqlCommand(selectSQL, con) Dim adapter As New SqlDataAdapter(cmd) Dim dsPubs As New DataSet() Next, the information for all three tables is pulled from the database and placed in the DataSet. This task could be accomplished with three separate Command objects, but to make the code a little leaner, this example uses only one and modifies the CommandText property as needed. Try con.Open() adapter.Fill(dsPubs, "Authors") ' This command is still linked to the data adapter. cmd.CommandText = "SELECT au_id, title_id FROM TitleAuthor" adapter.Fill(dsPubs, "TitleAuthor") ' This command is still linked to the data adapter. cmd.CommandText = "SELECT title_id, title FROM Titles" adapter.Fill(dsPubs, "Titles") Catch err As Exception lblList.Text = "Error reading list of names. " lblList.Text &= err.Message Finally con.Close() End Try

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