Database s in .NET

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Database s
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Figure 621: Our rendition of displaying the Customers and Orders data
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Master/Detail Control
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The Master/Detail control is designed for scenarios where a one-tomany relationship is de ned, such as with our Customers and Orders tables We leave it as an exercise for you to try using a Master/Detail control instead of nesting repeating controls
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Next step is to preview the form Since the data connection we created is set to retrieve data when the form is opened, we should immediately see the Customers and Orders data If you receive a Microsoft Of ce InfoPath Security Notice dialog, answer Yes to the prompt We ll discuss this dialog in 8 Figure 622 shows the result If any data in the Customers or Orders tables were to change, we would need to close and reopen the form to retrieve them The data connection is queried only when the form is loaded, so the data in the secondary data source is static for the duration of the form session If we wanted the ability to requery the database for the latest data without reopening the form, we could add a Button control that uses a rule to perform the query
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6: Retrieving Data from External Source s
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Figure 622: Preview of the modified form layout with Northwind customers and orders data
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Sorting and Filtering Data
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InfoPath does not allow for sorting the data while lling out the form If you want to add sorting in the server layer, it should be added to the SQL statement while setting up the data connection Otherwise, you can write custom form code to sort the data we ll visit the topic of form code (and show a sorting example) in 15 Filtering, on the other hand, can be set up while designing the form template 7 looks at how to lter list data, which can also be done for Repeating Tables and Repeating Sections
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Web Ser vice s
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Web Services
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What Is a Web Service A Web service is one of the richest external data sources to which InfoPath can connect If you have little experience with Web services, the next few sections should be a quick review Otherwise, you can skip reading until after we create a simple Web service in Visual Studio 2005 When we talk about a Web service, we are speci cally referring to a software component that runs on a Web server The component is de ned by the Web Service De nition Language (WSDL), which is a W3C published protocol (Details on the protocol are beyond the scope of this book MSDN is recommended as an in-depth reference on Web services speci cations; see the reference listed in the Appendix) To use a Web service data connection in InfoPath, the form uses the URL of the Web service in which you want to connect For example, Microsoft TerraServer has a Web service at http://terraservermicrosoft com/TerraService2 asmx As you can see, the URL of the Web service endpoint appears somewhat similar to other Web pages you may visit in a Web browser The distinguishing factor in the URL for this Web service is the asmx le extension The ASMX le is the actual Web service endpoint This is the URL InfoPath uses for query and submit operations against the endpoint To create a Web service data connection while designing a form, InfoPath requires the WSDL URL This is because a WSDL exposes the underlying Web service s public interfaces, including methods, input parameters, and output types Typically you can simply append wsdl to the endpoint URL to get the WSDL For the TerraServer Web service, visiting http:// terraservermicrosoftcom/TerraService2asmx wsdl yields its WSDL A WSDL, despite being XML, is really not meant for human consumption unless you are familiar with its intricacies Due to its complexity, there are tools available on the Web to help you easily decipher WSDL content As you will see in our upcoming example, InfoPath helps you to easily understand what methods (and even each of their parameters, if any) are available from a given Web service WSDL However, InfoPath is not very good at revealing the output types until you nish creating the data connection
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