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Instead of populating the whole tree, you ll populate only the currently visible portion of the tree initially. When a user clicks the plus sign to expand a directory, you ll populate the newly visible section. Hooking up to the BeforeExpand event is fairly easy. When this event occurs, a TreeViewCancelEventArgs is passed, and that class contains the node that s expanding. The event code will merely need to figure out what DirectoryNode object corresponds to the node passed with the event. When dealing with a tree view control in the MFC framework or directly in Win32, you can store a value with each tree node and use this value to point to the object that corresponds to the tree node. However, WinForms doesn t provide access to this, so you ll need to use another approach. One approach is to change DirectoryNode and FileNode so they re derived from TreeNode and then store those directly. This works fine but will complicate those classes, since they now depend on the WinForms classes. Another approach is to define a class derived from TreeNode that has a reference to the DirectoryNode or FileNode object for that node. That class is simple and looks like this: public class MyTreeNode: TreeNode { object node; // DirectoryNode or TreeNode public MyTreeNode(string text, object node): base(text) { this.node = node; }

The part between the first q/Q sequence is responsible for drawing the words Foobar Film Festival . The part between the second q/Q changes the current transformation matrix (CTM). Using the Do operator, you add an image of 232 by 362 user space units at position x = 25.5 and y = 27. The content of the image (the bits and bytes) are kept outside the content stream. Each page has a page dictionary with numerous key-value pairs. The value corresponding to the /Resources key will tell you where to find the resources that are used in the page:

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We ve seen also how and when to create subreports and multicolumn reports. Now, it is time to add more advanced report authoring techniques to our arsenal that will help us to create even more sophisticated reports. In the next chapter we ll learn how to enhance reports with expressions and functions.

The devlib directory will contain JAR files that are necessary for compilation but will not be distributed in the WAR. Libraries required for development (devlib) include the following:

As mentioned earlier, CHECKALLOC is included as part of CHECKDB, but can be run separately. CHECKALLOC validates that each page in the database has been allocated correctly. To understand how allocation works (and how it s verified by CHECKALLOC), we need to look at the space allocation process used in a database. SPACE ALLOCATION WITH GAM AND SGAM PAGES As covered earlier in the book, tables and indexes in a database are stored on one or more 8K pages. Pages are allocated to objects from extents, which are collections of eight pages, making each extent 64K. To reduce wasted space for small tables or

As figure 8.9 depicts, the USERS table contains data common to all users (such as USER_ID and USERNAME), Bidder-specific data (such as BID_FREQUENCY) and Sellerspecific data (such as CREDIT_WORTH). Records 1 and 2 contain Bidder records while record 3 contains a Seller record. This is indicated by the B and S values in the USER_TYPE column. As you can imagine, the USER_TYPE discriminator column can contain values corresponding to other user types, such as A for admin or C for CSR. The persistence provider maps each user type to the table by storing persistent data into relevant mapped columns, setting the USER_TYPE value correctly and leaving the rest of the values NULL. The next step to understanding the single-table strategy is to analyze the actual mapping implementation. Listing 8.12 shows the mapping for the User, Bidder, and Seller entities.

The compiler will catch this mistake, since you can t assign a new value to 0. Some programmers just hate the way this looks. Others love it and embrace this form for its safety. You are the programmer; you make the call.

The output looks like this:

To find all the songs by a particular artist, type that artist s name into the Search box in the upper right corner. You could also search by part or all of a particular song s name. Once you press the Enter key, you will be presented with all the matching items from the iTunes store (see Figure 30 37). You can then navigate around and purchase individual songs with the Buy Song buttons at the bottom.

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