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CHAPTER 4 INTRODUCTION TO QUADRANT
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PartOfComponent name by the key value. It turns out that Quadrant defaults to displaying the name of an item rather than the key, as long as a Name field exists. This is usually more informative, as compared to seeing only the numeric key.
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Managing Changes to the Data in Quadrant
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As you ve seen, Quadrant flags changes to the data (additions or edits) with an asterisk and by displaying a count of changes at the right of the status bar. Figure 4-24 shows that I ve mistakenly changed the PartOfComponent value for the Valves item from Engine to Steering, but I haven t yet committed this change. This, of course, would be an error, so I would like to reverse this change without saving it. I ve brought up the detail window for the Valves item, and it shows that only the PartOfComponent value has been altered (as indicated by the asterisk next to this property name), and nothing else. Note also that the title of the detail window also has an asterisk indicator. If you cursor over an asterisk (edited), exclamation point (conflict), or question mark (stale) indicator, the cursor will change momentarily to an annotation that states the meaning of the indicator. (The next several figures show this feature.)
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Figure 4-24. Indicators for an editing change (*) There are four ways to revert changes: Click the View Changes menu in the Quadrant menu bar to bring up a Changes view window, as shown in Figure 4-25. (See the name in the right side of the window s title bar.) Double-click Changes (1) displayed on the status bar. This will bring up the same Changes view invoked through the menu. The number of changes (in parentheses) shown in the status bar will, of course, vary according to the number of changes pending.
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Select the File Revert All Changes menu option in the Quadrant menu bar. This is the easiest way of reverting a batch of changes if you re not interested in saving any. Change the value of the item back to its original value, and then save the change.
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Figure 4-25. Reverting the change to the Valves PartOfComponent I ve selected the Valves item in this Changes view in order to display the nature of the change. This shows you the pending (Proposed) change to the PartOfComponent value (Steering), which is in error (for the purposes of this discussion), and the original value (Engine), which I d like to revert back to. Right-click in the right frame of the window (shown in Figure 4-26), then select Revert Changes in the resulting context menu.
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CHAPTER 4 INTRODUCTION TO QUADRANT
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Figure 4-26. Reverting the change after right-clicking in the right frame of the Changes view
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Managing Conflicts in Quadrant
As you know by now, SQL Server Modeling uses SQL Server as the Repository for persisting models. It can be used in a multi-user or team environment, as can the Repository. This means it is possible for more than one user to post conflicting changes to an entity or record in the database. Quadrant has a facility for resolving such conflicts. In this section, I ll show an example of how such a conflict can occur, and then how it can be resolved. Say, for example, User A changes the description for the Shock Absorbers entity from One for Each Wheel to Two for Each Wheel, and User B changes this to Three for Each Wheel by editing the table in SQL Server Management Studio. By doing this, the different users have introduced a discrepancy, or conflict, between the change made in Quadrant and the change made in SQL Server Management Studio. This could also happen if two are more team members are working with Quadrant on the same data but on two different computers. It could even happen if you have a second Quadrant session open to the same database. Figure 4-27 shows how such a conflict is indicated in Quadrant. Here again, the cursor shows an annotation as you hover over the indicator.
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