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Loop through data records and for each one:

When you use the DAAB, you access the database a bit differently than you would under ODP.NET. For instance, you have to use a factory class to hand yourself a connection object instead of instantiating one

Figure 8-12. Formatting bound data Here s an example that works with the UnitCost field and duplicates the previous example. It formats the numeric value as a currency string when it s requested for display in a text box.

switch (state) { case DBPermissions.State.Hidden: mnuItem.Visible = false; break; case DBPermissions.State.Disabled: mnuItem.Enabled = false; break; } } else { mnuItem.Visible = true; mnuItem.Enabled = true; } // Search recursively through any submenus. if (mnuItem.DropDownItems.Count > 0) { SearchMenu(mnuItem.DropDownItems, dtPermissions); } } } } } Best of all, if the permissions need to change or another access level needs to be added, only the database needs to be modified. An application created in this way is easy to maintain without painful recompiles and redeployment. Our example dynamically configures menus, but there are other approaches. For example, you could disable controls in a form (at which point you would probably want to add a FormName field to the Controls table). 22 demonstrates a similar technique with dynamic help content. You also could use a similar model to create localizable content for your menus. Instead of mapping controls to user levels with a State field, you would use a Text field that would be applied to the control s Text property.

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weight ! = 2

using the OracleConnection object directly. Let s now look at how you can perform common ODP.NET tasks via the DAAB. First, add a new form to your project. Design the form to look roughly similar to the screenshot in Figure 13-4. Place a DataGridView control in the middle of the form and three buttons on the left side.

Note You can even extend this system to make a radically configurable interface supporting user-selected themes, but beware of going too far. The more variation your application supports, the more difficult it is to create support material and solve problems in the field. This is the classic flexibility-versus-ease-of-use dilemma.

Figure 2-3. Read all records into memory and compare weight. A number of major inefficiencies are involved in this scenario: Our database server is consuming a relatively large amount of memory in order to fulfill our request. Every data record must be loaded into memory in order to fulfill our query. Because there is no ordering of our data records by weight, the server has no method of eliminating records that don t meet our query s criteria. This is an important concept and worth repeating: the order in which data is stored provides the server a mechanism for reducing the number of operations required to find needed data. The server can use a number of more efficient search algorithms, such as a binary search, if it knows that the data is sorted by the criteria it needs to examine.

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