6: Working with Business Data in Visual Studio .NET

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6: Working with Business Data
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Figure 6-11: The Filter Parameters Configuration page
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We will create a filter for Country This will make it so users will be prompted to filter customers by country, thereby ensuring that less data will typically be returned Click the Add Filter Parameter button and a new row is added to the Filter Parameters data grid Figure 6-12 shows the Filter Parameters data grid with the new row In the Element drop-down select Country, and in the Filter row click the (Click to Add) link to add a filter based on this element The Filter Configuration dialog appears as shown in Figure 6-13 In the Filter Configuration dialog name your filter CountryFilter Select Comparison for the Filter Type, Equals for the operator, and leave the Filter Field value set to Country Table 6-4 lists all the filter types available
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Figure 6-12: The Filter Parameters data grid with new row
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Figure 6-13: The Filter Configuration dialog
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6: Working with Business Data
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TABLE 6-4: Filter Types
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Filter Comparison
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Description Used while querying an external system, this value represents a pattern of regular and wildcard characters that is matched against the value of a particular field of the set of EntityInstances The external system returns only those EntityInstances whose field values match the specified pattern Used while querying an external system and the value of this filter can be interpreted as a limit on the number of external items (EntityInstances) that are returned when the method that it belongs to is called Used when paging of result sets is required The timestamp of the latest search crawl ActivityID is used when calling an operation on the external system Its value is set to a GUID that represents the current operation context If no such value is available, this filter generates a random GUID On SharePoint Foundation 2010, this filter uses the CorrelationID Used while querying an external system; an external system can compare a ComparisonFilter value with the value of a particular field of a set of external content type instances and only those external content type instances in which the field values pass the comparison test are returned
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Limit
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Page Number Timestamp ActivityID
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Wildcard
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We leave the remaining Filter properties as set by the tool and click the OK button The Errors and Warnings section shows two warnings The first one indicates that we have a comparison filter set without a default value and the query may return more data than we wanted We can ignore this warning because we will provide filter values through the UI The second warning suggests that we should implement a limit filter as the runtime cannot return more than 2,000 instances of an external content type So let s create another filter to set the limit to 2,000 Click the Add Filter Parameter button again In the Properties section leave the Data Source Element set to CustomerID Next click the (Click to Add) link in the Filter row In the Filter Configuration dialog leave New Filter selected, and name your filter CustomerLimit In the Filter properties section select
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Limit as the Filter Type Leave the other settings as created by SharePoint Designer and click the OK button Finally, set the Default Value to 2,000 by typing 2000 in the Default Value drop-down box The Filter Parameters Configuration wizard page should now look like Figure 6-14
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Figure 6-14: The Filter Parameters Configuration page for Customer
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Click the Finish button The external content type Customer is now defined It is CRUD capable and is searchable within SharePoint through SharePoint Search SharePoint Designer automatically adds properties to external content types that allow the SharePoint Search engine to crawl external content types We could also add an association to associate it with another external content type such as the Orders table We will take a deeper look into associations later in this chapter The next step is to create a UI so that users can work with the data defined by the Customer external content type
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