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Create an Associated External Content Type
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Now that you re familiar with the tools used to create external content types, you re ready to create another external content type for product information Then we ll define a parent-child relationship between our new Product content type and our existing Model content type 1 Follow the steps detailed earlier to create a new external content type named Product based on the AdventureWorks Product table Rather than manually configuring each operation, select Create All Operations from the context menu to allow the wizard to do most of the work This time flag the Name and ProductNumber fields to appear in the picker Remember to include a Limit filter to restrict the number of rows returned 2 In the Operations Design View, right-click the Product table to show the operations context menu This time, select New Association to create an association between this entity and our Model entity
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3 In the Association wizard, change the Association Name and the Association Display Name to Product Model The Association Display Name is shown in any form as the label for the External Data Picker control 4 Click the Browse button and in the dialog that appears, select Model When an entity is selected, its identifiers are listed in the Related Identifier column To the right is a Field column that contains drop-down lists, where we can select the field in our content type that maps to the identifier in the associated entity In effect, the Related Identifier column contains the primary key columns of the entity that we re associating with, and by selecting a matching field in our entity, we re creating a foreign key relationship 5 Click Next to proceed to the Input Parameters page Even though in the preceding step we defined the relationships between the entities, in the Input Parameters page we have to select the foreign key field from the list of Data Source Elements, and then check the Map To Identifier checkbox to create the foreign key relationship physically Click Finish to complete the wizard The list of external content type operations should be populated, as shown here:
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External Data Picker Control
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We ve now created a new Product external content type that has a relationship with our existing Model content type To see the effects of this association in action, create a new external list based on the Product content type In the Create List and Form dialog, set the List Name to Products
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By browsing to the new Products list using Internet Explorer, you ll see that when editing an item in the list, models can be selected from a list using an External Data Picker control, as shown here:
You should notice a few things when you re using the data picker First, the list displays all rows from the Models table If you enter criteria in the Find box, you ll get an error message, as shown next Second, if you select an item from the list and then click OK, the
Part IV
PART IV
Data Access Layer
Product Model control contains the ID of the selected item rather than the user-friendly text you might expect
Both of these problems are easy to resolve and take us back to our Model content type
Setting Picker Display Text
When opening the Model content type in Summary View, you ll notice a list of fields on the right side of the page 1 Select the Name field, and from the ribbon, click the Set As Title button 2 Save the changes to the external content type, and then review the Products list in Internet Explorer This time, when editing an item, the model name is displayed when a model is selected rather than the ID Each external content type can have a title column defined If no title is defined, the ID is used instead Any column in the entity can be flagged as the title
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