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How It Works In the handler for the drop-down list, you use the SelectedItem property to retrieve the dropdown box value (either 0, 1, or 1, as defined when you set up the list items earlier). You convert the value it contains to a Double using the Convert.ToDouble() method, and then add this value to the current date before setting that as the SelectedDate property of the calendar. You also set the VisibleDate property to the new date to ensure it s visible in the calendar. Finally, you update the label to show this date. In order to create a handler for the SelectionChanged event, instead of double-clicking the control, you explicitly selected the control and event you wanted to handle. You needed to do this because SelectionChanged is not the default event for this control. For all events except the default one for a control (like the Click event for a button or the SelectedIndexChanged for a drop-down list), you will use this procedure to create an event handler. To ensure that the event fires as soon as a change occurs in the drop-down list, you need to set the AutoPostBack property to True. This is an important step, because unlike the button and the calendar, drop-down lists don t cause a postback by default. Figure 3-16 shows the typical output of the page as it now stands.

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Another piece of general-purpose intervention that may help the optimizer to arrive at roughly the right selectivity is to introduce function-based indexes (FBI). Of course, adding an index to a table is an overhead that should be considered carefully; but if you have SQL that needs to get the selectivity correct (and it isn t appropriate to slip in a cardinality() or selectivity() hint), then you may be able to rewrite your code to cater to the presence of functionbased indexes. For example, create an index on to_date(v1,'yyyymmdd'):

Note Text fields with delayed evaluation do not stretch to acquire all the expression s content. This is

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Figure 3-16. The News page after adding event-handling code and selecting a date What stage have we reached You now know that web server controls offer several features above and beyond those of the HTML controls, and those features can make your time more productive. Their consistent object model is also beneficial, since once you ve learned the set of properties that are available for one control, chances are that you will see those properties again in other controls. The events available for web controls are different from the HTML events that you can use in the attribute list of an HTML tag; there are no onclick, onmouseover, onkeydown, and the like. This is because web control events are exposed on the server, and so comprise only those events appropriate for server-side processing. Imagine what would happen if your page caused a postback for every single mouse move operation! Even the Click event, which roughly corresponds to HTML s onclick event, is available only for those controls (such as buttons) where it makes sense.

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create index t1_v1 on t1(to_date(v1,'yyyymmdd')); begin dbms_stats.gather_index_stats( ownname => user, indname =>'T1_V1', estimate_percent => null ); end; / begin dbms_stats.gather_table_stats( ownname => user, tabname =>'T1', cascade => false, estimate_percent => null, method_opt => 'for all hidden columns size 1' ); end; / I have used a call to the gather_index_stats() procedure, followed by a call to the gather_table_stats() procedure, with the method_opt of for all hidden columns. From 9i onwards, you might want to query view user_tab_cols to identify just those virtual columns that are in need of statistics, rather than hitting every column in the table. With this setup in place, you finally convert your code from where to where to_date(v1,'yyyymmdd') between to_date('30-Dec-2002','dd-mon-yyyy') and to_date('05-Jan-2003','dd-mon-yyyy') v1 between '20021203' and '20030105'

For a complete description of all of the web server controls and the events that each can fire, check Tip

The optimizer will be able to use the statistics on the virtual column defined in your index to come up with the correct cardinality, even if the execution plan doesn t use the index.

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