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WhatPlaysWhatFormat table. In fact, you saw that updating an existing Player actually requires three queries to be executed. When inserting or updating, you trap any errors that occur and continue the save only if the previous query executed correctly. Consider the Click event handler for the Save button: // only save if valid if (Page.IsValid == true) { // save the player to the database bool blnPlayerError = SavePlayer(); // did an error occur if (blnPlayerError == true) { QueryResult.Text = "An error has occurred!"; } else { // save the formats for the player bool blnFormatError = SaveFormats(); // did an error occur if (blnFormatError == true) { QueryResult.Text = "An error has occurred!"; } else { // show the result QueryResult.Text = "Save of player '" + Request.QueryString["PlayerID"].ToString() + "' was successful"; // disable the submit button SubmitButton.Enabled = false; } } } If the SavePlayer() method fails, you ll tell the user that there is an error and not attempt to execute the SaveFormats() method. If the SavePlayer() method succeeds, then the SaveFormats() method is called. But what if the SaveFormats() method fails The SavePlayer() method has already made its changes to the database, and only the second set of changes fail. The result is that the Player stored in the database is now incorrect. What you need to happen is for all queries to the database to succeed. If any of the queries that are being executed fail, then they must all fail. What you need is a transaction.

< xml version="1.0" encoding="utf-8" > <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.commonsware.android.maps"> <uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> <application android:label="@string/app_name" android:icon="@drawable/cw"> <uses-library android:name="com.google.android.maps" /> <activity android:name=".NooYawk" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>

Transactions are a way to group different queries so that they all complete or they all fail it s all or nothing To use the correct terminology, you begin, or start, a transaction, and then perform whatever steps you need to take as part of the transaction If everything went as you wanted it to, you then commit the transaction, and all modifications are saved to the database If something has gone wrong, a rollback of the transaction takes place, and the database isn t modified it will appear as though the SQL queries you executed never took place Transactions, as with most things in the computing world, have their own acronym: ACID It s not some throwback to the 1960s, but the first letters of the four properties that all transactions must exhibit: Atomic: All queries within the transaction should succeed or fail.

Note that psvn tends to run svn status in the background to implement a number of its commands, so depending on the size of your working copy, you may find psvn more responsive if you display only a subset of your working copy by giving M-x svn-status a subdirectory within your working copy. The h command will allow you to jump back and forth between the various directories you ve given to M-x svn-status within a given session.

That is pretty much all you need for starters, plus to subclass your activity from MapActivity. If you were to do nothing else, and built that project and tossed it in the emulator, you would get a nice map of the world. Note, however, that MapActivity is abstract. You need to implement isRouteDisplayed() to indicate if you are supplying some sort of driving directions. In theory, users could pan around the map using the D-pad. However, that s not terribly useful when they have the whole world in their hands. Since a map of the world is not much good by itself, we need to add a few things, as described next.

The archetypal example that s always used is a bank transfer scenario If money is being transferred between two bank accounts, the tasks of taking the money from the source account and putting the money in the destination account both must succeed or both must fail You can t have money removed from the source account but not added to the destination account, and you can t have money appearing in the destination account without the money being removed from the source account Consistent: A transaction transforms the database from one consistent state to another consistent state Isolated: A transaction that s currently executing will not see the results of any other transaction until the other transaction has completed Durable: A committed transaction should remain committed in the database, even if a failure occurs after the transaction has been committed.

In the Java world, it has become increasingly common to manage a project s build process with Ant (http://antapacheorg/) Ant provides a simple XML language for describing the actions that should occur during the build, and an API for writing extensions to the core Ant functionality in Java As with just about every other tool used in software development, the standard reaction of a software developer is, of course, to see whether version control software can be integrated into Ant As you might expect, it can be, via the svnAnt project, an offshoot of the Subclipse project, which we will discuss later in the section Eclipse To install svnAnt, you simply need to download a release from the svnant directory of the Documents & Files section of the project s web site, located at http://subclipsetigrisorg/.