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When you have two entities with a relationship, such as Customer and CustomerAddress, and you run a query to retrieve a customer, the CustomerAddresses collection is not populated. A second query is executed when you enumerate items of the CustomerAddresses collection. If you look carefully at the SQL generated for the earlier Select query example, shown in Figure 18-5, you will see that after a customer such as AW00000001 is displayed on the screen, a SELECT statement is executed to retrieve the address for that customer. This behavior of loading data only when needed is called deferred loading. If you wish, you can change the framework s default behavior to one of preloading. You make that change using the DataLoadOptions class and its LoadWith method. The LoadWith method accepts a lambda expression as a parameter. You can specify which collection to load, thus preventing the DataContext class from deferring loads for that class. The following shows a code snippet in which territories for a region are retrieved as soon as the parent record for that region is retrieved. AdventureWorksDataContext db = new AdventureWorksDataContext(); DataLoadOptions dlo = new DataLoadOptions(); dlo.LoadWith<Customer>(c => c.CustomerAddresses); db.LoadOptions = dlo; db.Log = Console.Out;

IQueryable<Customer> query = from c in db.Customers select c; foreach (Customer customer in query) { Console.WriteLine(customer.AccountNumber); Console.WriteLine("-=-=-=-=-=-=-=-=-=-=-=-=-="); foreach (CustomerAddress address in customer.CustomerAddresses) { Console.WriteLine(address.AddressTypeID); } Console.WriteLine("-=-=-=-=-=-=-=-=-=-=-=-=-="); } When the CustomerAddresses collection is used to print territory descriptions, no other query is executed, and preloaded data is used instead. The output in Figure 18-21 demonstrates this behavior.

-P N.N: Height of page in inches -c N: Number of labels across page -r N: Number of labels top to bottom

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The LINQ to SQL framework and its O/RM tools allow you to execute both a stored procedure and a SQL user-defined function using an entity. If you use the SQLMetal tool, you need to include the /sprocs option to generate code to use every stored procedure within the database. If you use Visual Studio s LINQ to SQL Classes Designer, you can drag the stored procedure from the Server Explorer window and drop it onto the designer surface as usual. The stored procedure s name will appear in the top-right corner of the designer. For example, drag and drop the uspGetEmployeeManagers stored procedure, as shown in Figure 18-22.

} $pageForm->populate($itemPage->toArray()); // create the image preview $imagePreview = $pageForm->createElement('image', 'image_preview'); // element options $imagePreview->setLabel('Preview Image: '); $imagePreview->setAttrib('style', 'width:200px;height:auto;'); // add the element to the form $imagePreview->setOrder(4); $imagePreview->setImage($itemPage->image); $pageForm->addElement($imagePreview); $this->view->form = $pageForm; }

Figure 18-22 Visual Studio designer shows the new stored procedure The same approach applies for SQL user-defined functions You can use the /functions option for the SQLMetal tool or drag and drop the function from Server Explorer onto the Visual Studio designer surface This is what both tools generate in the code: [Function(Name="dbo uspGetEmployeeManagers")] public ISingleResult<uspGetEmployeeManagersResult> uspGetEmployeeManagers ([Parameter(Name = "EmployeeID", DbType = "Int")] SystemNullable<int> employeeID) { IExecuteResult result = thisExecuteMethodCall(this, ((MethodInfo)(MethodInfoGetCurrentMethod())),employeeID); return ((ISingleResult<uspGetEmployeeManagersResult>)(resultReturnValue)); } The stored procedure name has been used as a method name of the AdventureWorksDataContext class The Function attribute decorates the method; its Name property represents either the name of the stored procedure or the user-defined function To understand when a method needs to call the stored procedure or the user-defined function, the LINQ to SQL framework looks for the IsComposable flag.

-F FONT: Font family (e.g., Helvetica, Times Roman) -S SIZE: Font size in points; one point is 1/72 inch -m N.N: Inches from left edge of label -M N.N: Inches from top edge of label -l N.N: Inches from left of page to left edge of label -t N.N: Inches from top of page to top of label -x N.N: Label width, in inches -y N.N: Label height, in inches -L LEADING: Space between lines as percentage of font size -i N.N: Indent successive lines by N.N inches; indent=0 to turn off; adjust to taste -f C: Use character C as field separator instead of the default TAB -g: Print alignment grid along with labels -G: Print alignment grid only The default settings will print to a standard business card sheet, with two cards across and five down the page. To print to a sheet of labels three across and ten down, with labels 2.25 inches by 1 inch (just a test grid until we are sure it is right), use this: $ ps-labels -G -c3 -r 10 -x 2.25 -y 1 membership-file For a sheet of numbers (the seq command prints a list of numbers) in boxes .65 inch by .5 inch (see Figure 11-2), use this: $ seq 70 | ps-labels -g -c 10 -r 7 -x.65 -y.5 -S 18 -M .1 -F Helvetica-bold > sxxxxxsr1.ps

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