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8: Submitting Form Data
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For this example, we already created a SqlDataAdapter and a SqlConnection and also generated a DataSet called MOI_Customer_ Dataset by using Visual Studio 2005 (See 7 for the general steps to follow) Listing 82 shows the Web service code to get and update the DataSet, respectively
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Listing 82: Web Service Code to Get and Set the DataSet Object Data
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[WebMethod] public MOI_Customer_Dataset GetMoiCustomers() { sqlDataAdapter1Fill(moI_Customer_Dataset1); return moI_Customer_Dataset1; } [WebMethod] public void SetMoiCustomers(MOI_Customer_Dataset customerData) { if (customerDataHasChanges()) { sqlDataAdapter1Update(customerDataCustomers); } }
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Designing a Form Template with a Dataset Since dataset change tracking is supported only on the main data source, as we discussed in 7, we ll create a new form based on a Web service that will receive and submit data Next, as we do for all Web service connections, we enter the location of the Web service WSDL The next page of the Data Connection Wizard, shown in Figure 828, presents the Include change information when submitting data option Without this checkbox enabled, the dataset would not be properly serialized to a diffgram format when submitted to a Web service As a result, the dataset would be submitted in a raw XML format Since the SetMoiCustomers code snippet in Listing 82 accepts a DataSet object as a parameter, InfoPath must submit a properly serialized diffgram when the user is lling out the form Thus this checkbox must be checked Submitting raw XML to a Web service method that accepts a DataSet object will not properly update the database and may even cause unintended side effects like duplication of data
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Figure 828: Configuring change tracking for an ADONET dataset Web service
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Change tracking is not supported in browser forms As a result, the raw XML data is sent to the Web service instead of a diffgram The Web service will need to accept XML (such as an XmlNode object) and manually parse the changes to apply to the database
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The next few wizard steps include the nal page for setting up the receive data connection, locating the WSDL le for the submit connection, and selecting the SetMoiCustomers Web service method Finally, we get to the step where the wizard asks us to set up parameter mappings (Figure 829) As you can see in Figure 829 by the Type being set as (Complex Type), the parameter mapping step does not tell you that the tns:customerData parameter is a DataSet object Actually, there is no good way to know it s a
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Figure 829: Setting up a parameter mapping for a DataSet object
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dataset without looking at the Web service source code or WSDL Well, there is another way, but it s just to go ahead and click the button adjacent to the Field or group text box to select a data source node Expanding the data source in the Select a Field or Group dialog (Figure 830) might yield some hints that you re working with a dataset instead of some arbitrary data structure The data source in Figure 830 has telltale signs of a dataset First and most easy to see is the repeating virtual (Choice) group The other sign is the single group (or many groups for multiple tables) under the (Choice) group, which contains only elds To nd the root of the dataset itself, look no further than the immediate parent of the repeating (Choice) group: ns1:MOI_Customer_Dataset In this case, we made it easy since the dataset node has the name Dataset in it That s only because we used that name for the SetMoiCustomers DataSet object parameter But we could have called it anything
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Figure 830: Data source representative of a dataset structure
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Why are we discussing the root of the dataset and how to recognize it That s the node that must to be selected when mapping a dataset parameter As expected, Figure 830 has the correct dataset root node selected When the dataset root node is properly mapped to a submit parameter, InfoPath will perform the proper serialization to create a diffgram when the form is submitted Picking any other node in the data source will only send the raw XML data The other Parameter options settings in Figure 829 do not affect dataset serialization as long as the correct DataSet object is selected as the group to submit
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