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As you can see, deleting tables is simple and therefore dangerous! Be sure you re deleting the correct table! The first table you ve deleted from the database is the Manufacturer table: DROP TABLE Manufacturer Executing the query successfully deletes the table from the database. When you try to delete the Player table, however, you run into problems. The Player table provides a primary key for a relationship within the database, so it can t simply be deleted. As you ll recall, you created a relationship between the WhatPlaysWhatFormat and Player table, like so: ALTER TABLE WhatPlaysWhatFormat ADD CONSTRAINT FK_WhatPlaysWhatFormat_Player FOREIGN KEY (WPWFPlayerID) REFERENCES Player (PlayerID) Because the Player table provides the primary key in a relationship defined for the WhatPlaysWhatFormat table, you can t delete the Player table without first deleting the relationship. You could do this using a DROP CONSTRAINT or DROP FOREIGN KEY command, similar to those you ve already looked at, but you use a different solution here. You can t delete a table if it s providing the primary key in the relationship, but you can delete a table if it s the foreign key in the relationship, and doing so will delete all the foreign key relationships for the table. So, in deleting the WhatPlaysWhatFormat table, you deleted the FK_WhatPlaysWhatFormat_Player and FK_WhatPlaysWhatFormat_Format relationships. Once these relationships are deleted, you can delete the Player table. You ll notice that you haven t had any problems deleting tables that have indexes on them. As you ll recall, you specified indexes on the WhatPlaysWhatFormat table, yet the table was deleted without any problems. Unlike relationships, an index deals with only one table, and deleting the table automatically deletes any indexes for the table.

@Override public void onDestroy() { super.onDestroy(); unbindService(onService); }

Since the process of importing a new release into your vendor branch is fairly mechanical and kind of tedious, some thought has gone into finding ways to automate it. One of the results of thinking about automation is the svn_load_dirs.pl script, which is available in the contrib/client-side directory of the Subversion distribution. svn_load_dirs.pl automates much of the process of checking out the current version you have in your vendor branch; comparing it to the new version of the software; figuring out what files have been deleted, moved, and renamed; and committing the results to the vendor branch and optionally tagging them. As you might expect, svn_load_dirs.pl works by checking out the current directory (or whatever directory you tell it to use) from your vendor branch and then comparing the contents with the directory tree you re importing. It looks for files that have been added and removed and tries to determine whether any of them were renamed. Renames are performed using svn move and the remaining changes are handled with svn add or svn delete. The script will ask for confirmation from the user before making any of these changes. svn_load_dirs.pl is pretty simple to use, so we ll just leave you with an example of how you would perform the import of a Mail::SimpleList version 0.91 with this script: $ tar zxvf Mail-SimpleList-0.91.tar.gz

Note You can find more information about the DROP TABLE command for SQL Server at http:// msdn.microsoft.com/en-us/library/ms173790.aspx and for MySQL at http://dev.mysql.com/ doc/refman/5.0/en/drop-table.html.

If there are no other bound clients to the service, Android will shut down the service as well, releasing its memory. Hence, we do not need to call stopService() ourselves, because Android handles that, if needed, as a side effect of unbinding. This is a fair bit more code than simply using a public static singleton for the service object. However, this approach is less likely to result in memory leaks. So to recap: To have a service start running, use bindService() with BIND_AUTO_CREATE (if you wish to communicate via the binding mechanism) or startService(). To have a service stop running, do the inverse of what you did to start it: unbindService() or stopService(). Another possibility for stopping a service is to have the service call stopSelf() on itself. You might do this if you use startService() to have a service begin running and do some work on a background thread, so the service will stop itself when that background work is completed.

If you thought deleting a table was easy and a good way to lose data, then deleting a database is just as easy and with a lot more scope to delete a lot of data you didn t want deleted. So, you need to be especially careful when you decide to delete a database. The query to drop a database is as follows: DROP DATABASE <name>

[ ... lots of output ... ]

This will delete the entire database along with any tables, relationships, and data that still exist in the database. SQL provides no safeguards against deleting entire databases, and this emphasizes why you need to restrict access to the database and, in particular, any administration privileges. If someone has the password for the administrator account, she can delete everything on the server easily. Keep your administrator password secure, and don t give any other account any administrator privileges.

In the preceding chapter, you saw how the service sends a broadcast to let the WeatherPlus activity know a change was made to the forecast based on movement. Now, you ll see how the activity receives and uses that broadcast.