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Figure 5-1. Updating a bug in the Buglist application The following URL is used to arrive at this page: http://127.0.0.1:7780/pls/apex/f p=108:3:1716347696735738:::: P3_ID:1 Here, the itemNames parameter contains a single item (P3_ID), and the itemValues parameter contains a single value (1). In other words, when this page is called via that URL, the P3_ID page item will be set to a value of 1. The value of the P3_ID page item is used in the page to determine which record to retrieve and display to the user. Usually, you would want the user to go back to the previous page with the list of records and select a new one to edit. However, as you saw in the example of changing the page number in the URL in the previous chapter, it s possible for users to manipulate the URL directly themselves. To test this with the P3_ID value, simply change the value of 1 to 2 and enter the new URL into the browser s address bar, as shown in Figure 5-2.

We learned a lot more about the project when we started looking at the details of the stories in the first iteration. I think that keeping the focus to just the user stories in the first iteration helped us see the details better, without getting caught up in the specifics of the project as a whole. The customer seemed to appreciate the gaps we were finding early. It would be better if we had discovered the gaps up front, but I guess nobody is perfect. The developers are a little leery about all this estimating. They estimate at the story level, then again at the task level, and the estimate keeps getting adjusted. I had to remind them that refining their estimates is a good thing. The story estimates helped us all get an idea of just how big this project really is quickly, and the task estimates helped us rethink the size of a given story based on more detailed information. They still aren t too sure about all this estimating, but they are willing to keep trying it.

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this section. First, let s take it easy and use the nice graphical editor Kate. Afterward, I ll show you the real way of working with text files and discuss the venerable editor vi.

Figure 5-2. Modifying the URL directly to alter the P3_ID value By manually setting the value of the P3_ID page item, you can retrieve a different record. You can even cause the page to display an error by entering an invalid value for the P3_ID page item, such as a value that does not correspond to a record in the table, as shown in Figure 5-3.

This chapter actually doesn t discuss vi. Instead, it focuses on its user-friendly version: vi improved Tip

Figure 5-3. Modifying the URL directly with a nonexistent record ID In this example, URL manipulation lets you access records that you were able to access anyway, so the fact that the user is able to modify the URL manually might not look like all that big a deal. However, if you make some changes to the Buglist application to make it a bit more realistic in terms of the different levels of data access that people might have, the potential issues related to URL manipulation should become a bit clearer. First, instead of allowing the user to enter a free-format name into the Assigned To field, you ll make that field a list of people contained in the user_repository table. To do this, you will create a new LOV that returns the list of users in the user_repository table, as shown in Figure 5-4. The query to use for the LOV is shown in Listing 5-1.

(vim). vim has features for use with the various flavors of UNIX that you won t find in many versions of vi. There are even some UNIX versions of vi in which the arrow keys on your keyboard don t work and you have to use the commands h, j, k, and l instead!

Summary

Figure 5-4. Creating the LOV_USERS LOV Listing 5-1. LOV Query to Return Usernames in the user_repository Table select initcap(forename) || ' ' || initcap(surname) as fullname, username as username from user_repository order by surname

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