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Figure 617: Sort Order dialog for setting three levels of sorting order
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InfoPath user interface on child tables since the Modify Table button shows the Edit Relationship dialog If you wanted to implement sorting on child tables, you could edit the SQL statement for yourself
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Allowing Multiple Records to Be Displayed in a Form
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Checking the box Allow multiple records from this table to be displayed in the form, shown in Figure 617, modi es the XML Schema created by InfoPath to accept multiple items back from the database table If you expect only a single item to be returned, you can uncheck this box It s important to remember that if you do not check the box and multiple items are returned, a structural validation error will occur and the query will be canceled It s ne if you check the box and only one item is returned, however
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Can t Finish with Bad Sorting Conditions
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The Finish button may be disabled in the Sort Order dialog if you have a sorting condition that doesn t make sense For example, it will be disabled if you sort by the same eld name more than once
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6: Retrieving Data from External Source s
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Let s now look at the Edit SQL button shown in Figure 614 and what we can do with it Clicking it shows a plain dialog with a lot of text (Figure 618) Any changes you make in this dialog will attempt to be parsed by InfoPath to re-create the data source structure shown in Figure 614 If you make this shape query invalid through your own edits, you may receive one of these warnings or errors: Bad SQL Cannot create data source structure Column or table names do not adhere to XML naming standards It s highly recommended that you use the Test SQL Statement button in the Edit SQL dialog to ensure that your SQL query is valid and that data is properly returned from the database If you don t validate the SQL statement in this dialog, it will happen anyway when you click the Next button shown in Figure 614 So if you re making any modi cations to the SQL query, we highly recommend that you save time and test it rst If you receive a warning about the column or table names not adhering to XML node name rules, you can ignore it, however, because the invalid characters (such as spaces) will be automatically replaced with underscores by InfoPath to create the data source Since our current query is getting all customers and orders from the database, there will be way too much data and will take too long for the data connection to nish As a result, let s modify our query to give us just the rst three customers and all of their orders Toward the beginning of the SQL statement, replace {select "CustomerID" with {select TOP 3 "CustomerID" (The bold text is what you re adding to the query) When you click OK to the Edit SQL dialog, you will receive a warning that the SQL statement cannot be represented as a tree view This is simply a warning and will not affect the outcome of our data connection As you can see, sometimes warnings are okay to ignore, assuming you test your form and ensure that your modi cation works as expected In a moment when we open the form in preview, only three customers (and many more orders) will appear instead of almost one hundred customers (and who knows how many orders)!
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Figure 618: Edit SQL dialog, which allows hand-editing of the query statement used by InfoPath to create the data source
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To nd out more information about the ADO Shape command, its syntax, and usage, please see the How to Use the ADO SHAPE Command Microsoft Knowledge base article Q189657 (http://supportmicrosoftcom/ kb/q189657) After your database connection is set up as you d like and you are ready to nish, click on the Next button shown in Figure 614 In the next step of the Data Connection Wizard, do not select the option Store a copy of the data in the form template This option enables of ine query support, which we ll talk about in 7 The last page of the wizard is similar to that of the XML le data connection shown in Figure 67, except that the default name of the connection is usually the name of the primary table In our case, since the SQL Query could not be successfully parsed by InfoPath, the name defaults to Secondary Data Source Let s change it to Customers The fact that the query could not be parsed is not a problem as it affects only InfoPath s attempt to guess at a default connection name This time, let s leave the Automatically retrieve data when form is opened checkbox checked (which is the default setting)
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