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If you actually download the source code for the book, compile the NooYawk project, install it in your emulator, and run it, you will probably see a screen with a grid and a couple of pushpins, but no actual maps. That s because the API key in the source code is invalid for your development machine. Instead, you will need to generate your own API key(s) for use with your application. Full instructions for generating API keys for development and production use can be found on the Android web site (http://code.google.com/android/add-ons/googleapis/mapkey.html). In the interest of brevity, let s focus on the narrow case of getting NooYawk running in your emulator. Doing this requires the following steps: 1. 2. 3. 4. Visit the API key signup page and review the terms of service. Reread those terms of service and make really sure you want to agree to them. Find the MD5 digest of the certificate used for signing your debug-mode applications. On the API key signup page, paste in that MD5 signature and submit the form.

n 1, you learned that you can use almost any kind of data source to drive your dynamic pages You also learned that the relational database is the most commonly used type of data source for this purpose In this chapter, you ll take a closer look at how relational databases actually work You ll see how data is organized inside a database, and to make sure you understand it, you ll build your own sample database from scratch If you re wondering why this whole chapter focuses on the theory and setup of a database, it s because a badly designed and badly built database will nearly always come back to bite you once you start to build an application that uses it And this isn t an issue specific to ASPNET.

Any application on any platform that connects to a database will run into problems if the database isn t designed correctly in the first place Applications become harder to expand and slower to run as you spot-fix individual problems that wouldn t have come up if you had built the database correctly A data-driven Web site relies totally on its data source for content, so having it drag its heels because you built it wrong wouldn t be a good thing You ll look further at the actual designing of a database in 13, but you need to be familiar with the basics before you can go there.

Figure 7-7. SVN::Web viewing a revision From here, you have easy access to all the files and directories associated with a particular change, as well as to their revision histories and the log message. As with ViewVC, SVN::Web works by accessing your repository directly, so you ll need to deal with all the same problems relating to file permissions and database files that you would with mod_dav_svn and ViewVC if you are using BDB. Besides SVN::Web and ViewVC, there are a number of other web-based repository viewers, including WebSVN (http://websvn.tigris.org) and Chora (http://www.horde.org/chora). Each one has its own strengths and weaknesses, but most are customizable enough to make anyone happy.

On the resulting page, copy the API key and paste it as the value of apiKey in your MapView-using layout.

This chapter covers the following topics: The different pieces that make up a database: the tables that hold the data, the columns that define what the table holds, and the rows that contain the actual data The different types of SQL queries and an introduction to the most commonly used queries, as well as stored procedures How indexes can make your databases more efficient The different types of relationships between tables and how these can be modeled in the database How to create and use SQL Server 2005 database diagrams, which show the layout of your database An introduction to database views and triggers.

The trickiest part is finding the MD5 signature of the certificate used for signing your debug-mode applications. Actually, much of the complexity is merely in making sense of the concept. All Android applications are signed using a digital signature generated from a certificate. You are automatically given a debug certificate when you set up the SDK, and there is a separate process for creating a self-signed certificate for use in your production applications. This signature process involves the use of the Java keytool and jarsigner utilities. For the purposes of getting your API key, you only need to worry about keytool. To get your MD5 digest of your debug certificate, if you are on Mac OS X or Linux, use the following command:

Relatively recent to the world of Subversion (compared to the plain web-based repository viewers) is an all-singing, all-dancing, integrated product known as Trac. Trac provides a repository viewer, a wiki, and an issue tracker, all with a relatively unified interface. It is very easy to set up, and provides most, if not all, of what smaller projects want in one place, with a very nice interface. Links between each piece of Trac are natural, making it easy to link