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The Wrapper module that is created by the default installation is essentially a blank module instance created from the mod_wrapper module type. You can create other wrapper modules using the New button in the Module Manager and setting the module type to mod_wrapper.

As discussed earlier in this section, recall that the Canvas class is abstract and so must be subclassed in order to develop a low-level graphical user interface displayable. A simple example of a Canvas class is shown in listing 5.6.

) If there were such an index on employee names, the optimizer could decide to abandon the full table scan approach and perform an index search instead The index offers a very efficient access path to all names, returning all row identifiers of employees with a name starting with a Q This probably would result in a huge performance improvement, because there are only a few database blocks to be visited to produce the query result..

Listing 5.6 CanvasDemo Displaying a string at position 1,1

Random Image (mod_random_image)

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For some of your other queries, indexes on department numbers or birth dates could be useful. You can create as many indexes per table as you like. In summary, the performance of your SQL statements can often be improved significantly by creating indexes. Sometimes, it is obvious that an index will help, such as when your tables contain a lot of rows and your queries are very selective (only retrieving a few rows). On the other hand, though, you may find that your application benefits from an index on a single-row, single-column table. Indexes may speed up queries, but the other side of the index picture is the maintenance overhead. Every additional index slows down data manipulation further, because every INSERT/UPDATE/DELETE statement against a table must immediately be processed against all corresponding indexes to keep the indexes synchronized with the table. Also, indexes occupy additional space in your database. This means that you should carefully consider which columns should be indexed and which ones should not be indexed. These are some suggestions for index candidates: Foreign key columns Columns often used in WHERE clauses Columns often used in ORDER BY and GROUP BY clauses

import javax.microedition.lcdui.*; class CanvasDemo extends Canvas {

Figure 7-11. CREATE INDEX command syntax diagram The storage clause allows you to influence various physical index storage attributes, such as the storage location and the space allocation behavior. See the Oracle SQL Reference for more details. If the table rows happen to be inserted and stored in index order, you can specify the NOSORT option to speed up index creation. The Oracle DBMS will skip the sort phase (normally needed during index creation), but if the rows turn out to be in the wrong order, the CREATE INDEX command will fail with an error message.

The Random Image module displays a random image chosen from a specified folder. This module is useful for displaying random banner images that have a similar theme or presentation. The module can essentially impart to frequent visitors that the site is changing and new without requiring the system administrator to do any work beyond the initial setup. This module can also be used for banner advertising, but given the primitive nature of the module, the Banners module would be a better choice for that application. The parameters for the Random Image module are shown in Figure 7-7. The Image Type and Image Folder settings determine how the images will be retrieved. The Link parameter will attach a hyperlink to the displayed image. The Width and Height parameters will scale the image to fit the corresponding values. Finally, the Module Class Suffix parameter will append a suffix to the style sheet names to access a custom style sheet for this module that has been created in the CSS file.

protected void paint(Graphics g){ g.drawString("Canvas Demo",1,1,Graphics.TOP|Graphics.LEFT); g.fillRect (20,30,30,20); Drawing a filled rectangle g.drawLine(50,50,75,50); g.drawLine(75,50,75,75); g.drawLine(75,75,50,75); Drawing a rectangle g.drawLine(50,75,50,50); using four lines }

Unique indexes serve two purposes: they provide additional access paths to improve response times (like nonunique indexes), and they also prevent duplicate values. You create unique indexes by specifying the UNIQUE option of the CREATE INDEX command (see Figure 7-11). Note, however, that it is recommended to ensure uniqueness in your tables using the PRIMARY KEY and UNIQUE constraints, leaving it up to the Oracle DBMS to choose an appropriate physical implementation of those constraints.

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