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Instead of going into more detail about what you can do to be sure that you can always migrate an object, and there would be a lot of detail, let s ask whether there is a way you can avoid having to change a schema. Surely not! You can write your application now and try to imagine everything you need to keep track of, but once people start using it, they are going to have suggestions. One of the downsides of putting an application out into the world is that you then have to deal with users, and users have suggestions and report bugs and behave in other inconvenient ways. You have to deal with users who have entered data into your application and who do not want you to upgrade your app in such a way that their data gets deleted. When I was working on EOF and WebObjects for Apple, I created a class that uses KVC in an unusual way. I am going to use this trick again to make it so that the Event entity will not have to be changed, even when you want to see new attributes in the UI. To do this, add another entity to your schema. It will be helpful to create a third version of your schema at this point and add the entity in that version. Call the new entity EventExtra. Add an attribute called name and an attribute called value. These are both of type String. After you are done, your new Locations03.xcdatamodel file should look like Figure 6-7.

Where is the testresults.log file We gave it a physical name, testresults.log, but we did not specify a path for it, so it will be located in the default path for this application, which is in the application s bin folder. If you followed the instructions at the start of this exercise and used the DownloadFiles\3\VB\Exercise3-1\FirstTest\ (or replace the VB with C#) application, then you can open that folder and find the bin directory within it, then the Debug directory within that. The testresults.log file will be there. So the full location will be DownloadFiles\3\VB\Exercise3-1\FirstTest\bin\ Debug (or replace the VB with C#). However, hold off there s an easier way to find it, and you ll do that in the next two steps. 7. Locate the Solution Explorer window in the .NET IDE. Note that it has three buttons in its toolbar. Click the middle button to Show All Files. Your Solution Explorer window will look like Figure 3-1.

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We know that this SQL query will not retrieve any data (because the Boolean expression 1 = 0 will be always false), but all of the metadata for the ztest table will be captured.

You are going to rely on something that the NSManagedObject gives you that most people do not take full advantage of. It is the fact that the KVC protocol has two methods for recovering from the use of nonexistent keys when reading from or writing to an object. Most developers do not override these methods, and the default behavior of these methods is to throw an exception. But these methods can be overridden, and they can be used to dynamically modify the attributes of an entity. First, save your schema, and verify that your application works as it did before. You will see that the object has the same attributes. Adding a new relationship did not change that. Here is what you need to add to your Event.m file:

Figure 3-1. Showing all files in the Solution Explorer window 8. Expand the bin folder in the Solution Explorer window (using C#, you will also have to expand the Debug folder). Inside this window, you will see the testresults.log file listed. Double-click it to open the testresults.log file as a tab in the .NET IDE. The contents will look similar to the following: Test Results for Test Run XYZ; 4/23/2005 7:07:24 PM File Doesn't Exist: Test Failed Test Completed for Test Run XYZ; 4/23/2005 7:07:42 PM No matter how many different files you searched for when you ran this utility, this is all that will display. This is because the code creates the text file each time the button is clicked, so it wipes out any results except those results for the last click. There are some other issues with this code as well. For example, it doesn t even say which file it failed to find! We ll fix all of this in Part II of this exercise. You can find the answer for Part I of this exercise in the Download Files folder.

mysql> use octopus; Database changed mysql> desc ztest; +-------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+-------------+------+-----+---------+-------+ | id | varchar(10) | | PRI | | | | name | varchar(20) | YES | | NULL | | +-------+-------------+------+-----+---------+-------+

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