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The provider constructs a parallel expression tree that more closely matches the SQL implementation Once the expressions are parsed, the provider constructs the resulting SQL statement, substituting the appropriate mappings to translate the objects into table and column names taken from the attributes or XML mapping source Once all of the pieces are put together, the resulting SQL statement can be sent to the database The resulting values are then used to populate the necessary object collection, again using the mapping information as appropriate Performing the translation from the expression tree to a provider-specific implementation increases in complexity as we add more functions to the tree It would be impossible to cover all of the possible query permutations in this book.

After you build a custom form (or report) toolbar, it would be helpful (and consistent) to replace the built-in menu bar with a custom menu bar. You can then set the Menu Bar property of your forms (or reports) to point to the custom menu bar. For example, the Custom Form Menu Bar in the LawTrack Contacts sample database, as shown in Figure 24-7, has a limited set of commands that matches the functionality of the custom toolbar described in the previous section. When you open the File menu, you can see that the commands a user shouldn t need, such as New Database, aren t available on the custom menu.

Figure 24-7. The custom File menu on the Custom Form Menu Bar eliminates unneeded commands, such as Open Database, New Database, Save, Export, and Database Properties.

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Note If you or your user chooses to leave adaptive menus turned on (by entering customize mode and leaving Always show full menus turned off on the Options tab), this won t affect the design of your custom menus. You can still design full menus for your application. With this option turned on, Access shows only the most recently used options first on your custom menus. 936

The Finishing Touches Prior to Microsoft Access 97 (version 8), the only way you could define a custom menu bar was to construct a complex series of macros You needed one macro consisting of AddMenu actions to define the basic menu bar You also needed an additional macro for each dropdown menu or submenu in that menu bar You might have used as many as a dozen macros just to define one custom menu bar Access 2003 still supports AddMenu macros for backward compatibility, but it s much easier and more flexible to define a menu using the customize facility For several of the standard menus, such as Edit, Insert, Records, and Window, you can copy the built-in menu as is One of the advantages of copying built-in menus is that you automatically get any additional commands that appear on these menus in particular situations.

If you re interested in pursuing this further, Matt Warren, one of the original architects of LINQ to SQL, has a detailed explanation demonstrating how to implement an IQueryable provider in a blog series starting with http://blogsmsdncom/ mattwar/archive/2007/07/30/linq-building-an-iqueryable-provider-part-iaspx..

For example, if you copy the built-in Edit menu, when the focus is on an OLE object, you will see OLE object editing commands at the bottom of the Edit menu on your custom menu bar If you were to build these menus on your own, you would first have to place the focus on a control that activates these commands before opening the Customize dialog box and then copy the commands from the built-in Access menus (No, you can t find these commands in the Edit category on the Commands tab) If you build a custom menu on your own and copy selected focus-sensitive commands from the built-in menu, you still get the desired effect of having the commands appear only when the focus is on an appropriate object.

As another example, if you copy the built-in Window menu, you get the built-in list of open windows at the bottom of your custom Window menu To start building a custom menu, be sure you have the frmContactsPlain form open in Form view (This reveals all the built-in commands on the built-in menu bar) Right-click any menu bar or toolbar, and select Customize from the shortcut menu Click the New button on the Toolbars tab, name the menu bar Sample Custom Menu Bar in the New Toolbar dialog box, and click OK Click the Properties button, and in the Toolbar Properties dialog box, set the Type to Menu Bar Close the dialog box to go to the next step Next, click the Commands tab in the Customize dialog box, and scroll to the bottom of the Categories list.

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