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Entity Framework does not directly support the notion of lazy loading of individual entity properties. To get the effect of lazy loading expensive properties, we exploit Entity Framework s support for lazy loading of associated entities. We created a new entity type to hold the expensive full image property and created a one-to-one association between our Photograph entity type and the new PhotographFullImage entity type. We added a referential constraint on the conceptual layer that, much like a database referential constraint, tells Entity Framework that a PhotographFullImage can t exist without a Photograph. Because of the referential constraint, there are a couple of things to note about our model. If we have a newly created PhotographFullImage, an instance of Photograph must exist in the object context or the data source prior to calling SaveChanges(). Also, if we delete a Photograph, the associated PhotographFullImage is also deleted. This is just like cascading deletes in database referential constraints. The code in Listing 2-8 demonstrates inserting and retrieving from our model.

//Variables required to display the asteroid bitmap private var _asteroidBitmap:Bitmap; private var _asteroidBitmapData:BitmapData; //Embed the image of the asteroid using a relative path to the PNG image //Create a class to store the image [Embed(source="../assets/images/asteroid.png")] private var AsteroidImage:Class;

So, to import a dsimport file into an Open Directory system, use the following command:

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Listing 2-8. Inserting into and Lazy Loading Expensive Fields byte[] thumbBits = new byte[100]; byte[] fullBits = new byte[2000]; using (var context = new EFRecipesEntities()) { var photo = new Photograph { PhotoId = 1, Title = "My Dog", ThumbnailBits = thumbBits }; var fullImage = new PhotographFullImage { PhotoId = 1, HighResolutionBits = fullBits }; photo.PhotographFullImage = fullImage; context.Photographs.AddObject(photo); context.SaveChanges(); } using (var context = new EFRecipesEntities()) { foreach (var photo in context.Photographs) { Console.WriteLine("Photo: {0}, ThumbnailSize {1} bytes", photo.Title, photo.ThumbnailBits.Length.ToString()); // explicitly load the "expensive" entity, PhotographFullImage photo.PhotographFullImageReference.Load(); Console.WriteLine("Full Image Size: {0} bytes", photo.PhotographFullImage.HighResolutionBits.Length.ToString()); } } The output from Listing 2-8 is the following: Photo: My Dog, Thumbnail Size: 100 bytes Full Image Size: 2000 bytes The code in Listing 2-8 creates and initializes instances of the Photograph and PhotographFullImage entities, adds them to the object context, and calls SaveChanges(). On the query side, we retrieve each of the photographs from the database, print some information about the photograph, and then explicitly load the associated PhotographFullImage entity. Notice that we did not change the default context option that turns off lazy loading. This puts the burden on us to explicitly load related entities. This is just what we want. We could have chosen not to load the associated instances of PhotographFullImage, and if we were iterating through hundreds or thousands of photographs, this would have saved us an awful lot of cycles and bandwidth.

public function Asteroid():void { // var asteroidImage:DisplayObject = new AsteroidImage(); asteroidImage must be typed as a DisplayObject This is a bit confusing because it s obviously an instance of AsteroidImage. The problem is that the AsteroidImage class won t be available to the compiler when it tries to compile the SWF. If you try to type it as AsteroidImage, you ll get the error Type was not found or was not a compile-time constant: AsteroidImage. This just means that the compiler doesn t know what the AsteroidImage class is, and it doesn t know where to look for it. Because the AsteroidImage class is created in the class definition, it s hidden to the compiler. This is a little technical nuisance, but easily handled. Just use the more general DisplayObject, and all will be well.

dsimport ~/Documents/users_dsimport.txt /LDAPv3/odserver.myco.com M -userpreset "Staff Member" -username diradmin -password 'mydiradmin password'

You have some tables that contain additional information about a common table and you want to model this using table per type inheritance.

PNG image into it. _asteroidBitmapData = new BitmapData(asteroidImage.width, asteroidImage.height, true, 0); _asteroidBitmapData.draw(asteroidImage); This code should be starting to look quite familiar to you by now.

In this example, we are importing a user file into our LDAP directory using a merge. Here, we specify the userpreset flag, which allows us to set up a preset in Workgroup manager to establish group memberships, home directory settings, and mail and print settings. (You can create presets using Workgroup Manager.) In this command, we also supply our diradmin credentials to provide access for the import itself, presenting one of the biggest barriers to full automation for this process: any automated processes will need to have a directory administrator s credentials embedded. However, embedding administrator credentials in a script to automate import from a csv is not the only issue with a fully automated user-generation process. For instance, say you set up a launchdaemon with a QueueDirectory entry, which watches a directory for any new files from your information system, passes them to csvtowgm, and then uses the resulting file for import via dsimport. Such a script might look something like this:

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