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Accessing Data in InfoPath Forms
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One of the powerful features of InfoPath, especially when it comes to generating browserbased forms, is the ability to connect to additional data sources We can reuse our earlier Demonstration Equipment Request form to see this in action 1 Open the EquipmentRequestxsn file from the local file system Our form has two sections: the top section captures customer details and the bottom section captures a list of products Rather than manually keying in customer details, we ll make use of a SQL Server database to look up the required information and automatically populate the fields
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TIP For demonstration purposes, SQL connections are easiest to use However, their usefulness within InfoPath forms is pretty limited Passing parameters generally requires custom code, as you ll see later As a general rule, the best way to communicate with external data sources is to create a custom web service interface InfoPath can then parse the Web Service Definition Language (WSDL) and create fields for any parameters that may be required To provide some sample data to work within our various examples, we need to download and install the SQL Server 2008 sample databases, which can be found at wwwcodeplexcom/MSFTDBProdSamples Our examples make use of the AdventureWorksLT database installed on the local instance of SQL Server 2008 2 At the bottom of the Customer Details section, add a button Buttons and other controls can be found in the Controls section of the Home ribbon Type the button label as Find Customer 3 To add a data connection, switch to the Data tab on the ribbon, and then click From Other Sources | From Database, as shown:
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4 Click Select Database to select from the data sources that are available on the current machine If one is not available for the AdventureWorksLT database, click New Source to add one Select the Customer table when prompted Once the data connection has been made, the columns will be listed, as shown next:
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Part II
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PART II
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5 Since we want to use a query to extract data from more than one table, click Edit SQL and enter the following SQL statement:
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Select CCustomerID, CCompanyName, AAddressLine1, AAddressLine2, ACity, AStateProvince, APostalCode SalesLTCustomer as C SalesLTCustomerAddress as CA CACustomerID=CCustomerID SalesLTAddress as A AAddressID=CAAddressID
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6 Click Next Leave the Store A Copy Of The Data In The Form Template checkbox unchecked Click Next and then uncheck the Automatically Retrieve Data When Form Is Opened checkbox Set the connection name to Customer and then click Finish to create the connection 7 We ll make use of the Company Name field to search for customers All other fields will be populated automatically from the search results To make all other fields read-only, select the field and then from the Properties tab of the ribbon, check the Read-Only option in the Modify section Repeat this process for all fields in the Customer Details section other than the Company Name field 8 We ll display our search results on a separate page From the Page Design tab s Views section, select New Name the new view Customer Search Results 9 Type the title of the new view as Customer Search and then, from the Fields pane, in the Fields drop-down, select Customer (Secondary) (The Fields drop-down is something of a misnomer In reality, the drop-down contains a list of the data connections that are available to the current form) 10 Drag the d:Customer repeating group onto the Customer Search form Select Repeating Table as the control type When producing a schema from a SQL statement, InfoPath also adds columns for both sides of a join relationship As a result, three redundant columns are named CustomerID1, AddressID, and AddressID1 To remove these from our repeating table, simply select the offending columns and choose Delete | Columns from the Layout tab 11 Since we don t want the user to be able to edit the contents of these fields, using the Change Control button on the Properties menu that we demonstrated earlier, change the controls to Calculated Values 12 The final item that we need to add to our search form is a button to select the correct customer Place the cursor in the first column of the table and then, from the Table tab in the ribbon, click Insert Left 13 Add a button in the data area of the new column and type the label as Select The completed form should look like this:
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