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We query the values we inserted so far to get one row we inserted. The result shows the column email_addresses as a single entity representing all the e-mail addresses nested within: benchmark@ORA10G> select * from dep_email_addresses; DEP_NO EMAIL_ADDRESSES ------ ---------------------------------------------------------------10 VARRAY_OF_VARCHARS('king@mycompany.com', 'joe@mycompany.com', 'john@mycompany.com') To unnest the individual e-mail address values tucked away in the varray column into separate rows, we can use the table clause along with the keyword column_value in our query as follows. Essentially, we have to do a join of the table dep_email_addresses with our varray column cast as a table using the table clause. As you can see, what would be a simple select joining a parent/child table looks more complicated when we use objects to store data in tables: benchmark@ORA10G> select c.dep_no, a.column_value 2 from dep_email_addresses c, table(c.email_addresses) a; DEP_NO -----10 10 10 COLUMN_VALUE -------------------------------------------------king@mycompany.com joe@mycompany.com john@mycompany.com

event property names with the word On , to make it easy to distinguish event properties from ordinary properties. Using this convention, events like ButtonClicked and DocumentDownloaded would be exposed through event properties called OnButtonClicked and OnDocumentLoaded. The related Fire methods would be named FireButtonClicked and FireDocumentLoaded, respectively. Once you adopt a naming convention, it allows you to make certain inferences from a wiring diagram. Consider the simple diagram in Figure 8-25.

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3 rows selected. Next, we insert another row into dep_email_addresses. This row is obtained as the result of a query from the same table (this shows how to use the syntax for insert into <table_name> <select from>-type statements with tables containing columns of the collection type). The code is even more complicated in this case. The innermost select uses the syntax to unnest the varray column values, as you saw in the previous example. The keyword multiset is used to specify that the subquery can return more than a row (without it, Oracle will give an error if the subquery returns more than one row). The cast function casts a value from one type to another. We use it here to cast the resulting query rows into our varray type: benchmark@ORA10G> insert into dep_email_addresses 2 select 20, 3 cast 4 ( 5 multiset 6 ( 7 select a.column_value 8 from dep_email_addresses c, TABLE(c.email_addresses) a 9 ) 10 as varray_of_varchars 11 ) 12 from dep_email_addresses 13 where dep_no = 10; 1 row created.

Figure 8-25. A wiring diagram with only one signal The diagram shows a single notification signal, called DownloadComplete, being sent from A to B. If you implement the system using your naming convention, you could infer that object A would have two things: an event property called OnDownloadComplete and a fire method called FireDownloadComplete. To bind a handler to the event, subscribers would access A s OnDownloadComplete property. While the On naming pattern originated with Visual Basic, it was adopted by other systems, such as Microsoft Foundation Classes (MFC), COM, and Delphi. The use of a naming convention is good, because it simplifies the task of locating artifacts in the source code that aren t documented explicitly. The JavaBeans world uses a different naming convention that relates events, notification payload types, and listener interfaces. If an object supports an event named Action, then it can fire notifications that carry a payload of type ActionEvent. Listeners must expose an interface named ActionListener. The event source advertises the presence of its Action event by exposing the methods addActionListener and removeActionListener, which subscribers can call to subscribe and unsubscribe. As an example, consider the wiring diagram for a Java system, shown in Figure 8-26.

If Show Details is used in a pivot table, all columns from the source data are shown, not just the fields currently in the pivot table layout. A new worksheet is automatically created for the extracted records; you can t change a setting to control where the extracted records are placed.

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