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In the previous sections, we saw the algebra operations select (a subset of rows) and project (a subset of columns) acting independently. One of the most powerful features of the algebra is that the result of an operation is another table (or, more formally, another set of unique rows). This means we can apply another operation to the result of the first operation and so build up complex queries. We can use successive operations to create an algebra expression for the query in Figure 2-2c, retrieving the names and handicaps of junior members. First we find the rows for juniors using a select operation, and then we use a project operation to retrieve the required columns from the result. Listing 2-10 shows the full expression.

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.apress.timesheets</groupId> <artifactId>timesheets-core</artifactId> <packaging>jar</packaging> <version>1.0-SNAPSHOT</version> <name>timesheets-core</name> <url>http://maven.apache.org</url>

The objects within a Canvas panel have no layout policies placed on them by the layout control and will not resize automatically when your application is resized within the browser.

Listing 2-10. Combining a Select and Project Operation LastName, FirstName, Handicap ( MemberType = 'Junior' (Member))

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<dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> </dependencies> </project> The only build-related configuration detail is related to the type of file that should be produced by a full build. In Listing 2-4, this will be a JAR file called timesheets-core-1.0SNAPSHOT.jar (composed from the artifactId, version, and packaging elements of the POM file). To generate this file, the install target should be invoked with the command mvn install. The output of this target will then be installed into the local repository. To perform a build from scratch, you can add the clean target thus: mvn clean install. The most important section of the file is the dependencies element containing a list of dependency elements. These are the libraries that your application will utilize. So, in the generated code there is a dependency on the JUnit library at version 3.8.1 that will be used only when running unit tests (that is, it will not be included in the output of any builds). Dependencies will be downloaded from the repositories available to your build, starting with the local repository; and if not available from there, an attempt to download from the remote repository will occur (or any other repositories you may add to the POM configuration). In the example application, you will not need to specify the contents of the POM files because they have already been provided for you. However, if you want to build on the examples or create an application from scratch, you should spend some time reading about the Maven build tool on the Maven website at http://maven.apache.org.

Let s try out a quick example of using the Canvas panel. 1. Open Visual Studio 2010 and create a new Silverlight application called CanvasPanel. Allow Visual Studio to create a Web Application project to host the application. When the project is created, you should be looking at the MainPage.xaml file. If you do not see the XAML source, switch to that view so you can edit the XAML. Within the main Grid element, add a Canvas element. Assign it a Width property of 300 and a Height property of 300. In order to see the Canvas panel in the application, also set the background color to green. The following XAML adds this Canvas: <Grid x:Name="LayoutRoot" Background="White"> <Canvas Background="Green" Width="300" Height="200"> </Canvas> </Grid> At this point, your Silverlight application doesn t look that exciting. It contains only a single green rectangle positioned at the very center of your application, as shown in Figure 3-2.

As you can see, the algebra tells us how to get the result we want. First get the appropriate rows, and then get the required columns. The calculus doesn t tell us how to carry out a series of steps; it just describes what the final set of rows will be like. Have a look at Listing 2-11.

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