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the domain might be integer values greater than 0. All database systems have built-in domains or types such as text, integer, or date that can be chosen for each of the fields in a table. Systems vary as to whether users can define their own more highly specified domains that they can use across different tables; however, all good database systems allow the designer to specify constraints on a particular attribute in a table. For example, in a particular table we might specify that a birth date is a date in the past, that the value for a gender field must be M or F , or that a student s exam mark is between 0 and 100. The idea of domains becomes important for queries when we need to compare values of columns in different tables. When I refer to a database table in this book, I mean a set of rows with a nominated primary key to ensure every row is different and where every column has a domain of allowed values. Listing 1-1 shows the SQL code for creating the Member table with the attribute names and domains specified. In SQL, the keyword INT means an integer or nonfractional number, and CHAR(n) means a string of characters n long. The code also specifies that MemberID will be the primary key. (Listing 1-1 doesn t create the relationship with the Team table yet.) The code is fairly self-explanatory.

When users click the icon in the logo, the Silverlight runtime will start to download. Once the runtime is finished installing, the Silverlight application is immediately available to the user.

Hibernate Query Language (HQL) is a relational language that can be used to manage the persistent Hibernate entities. It is exactly analogous to SQL, except that it manipulates objects in place of database entities. HQL queries are converted into SQL for execution, and the results of these SQL queries are then converted back into objects (although the use of caching may eliminate some or all calls into the database layer).

Listing 1-1. SQL to Create the Member Table CREATE TABLE Member ( MemberID INT PRIMARY KEY, LastName CHAR(20), FirstName CHAR(20), Phone CHAR(20), Handicap INT, JoinDate DATETIME, Gender CHAR(1))

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In the past, setting up an environment to work with Microsoft s latest and greatest has been relatively straightforward, typically involving only the setup of the latest version of Visual Studio and the appropriate software development kit. However, with Silverlight, the situation is quite a bit different due to the introduction of many new tools. Let s look at the tools involved in setting up a Silverlight 4 development environment. 1. Visual Studio 2010: As noted, this is the latest version of Microsoft s IDE, the successor to Visual Studio 2008 (see Figure 1-8). For your Silverlight environment you should install Visual Studio 2010, which automatically installs Microsoft .NET Framework 4. 2 covers Visual Studio 2010 in more depth.

A large part of the implementation of a Hibernate-based DAO is in fact the configuration information required by Hibernate to associate the tables and columns of the database representation of an entity with the classes and properties of its Java representation. Before Java 5, this could be represented by configuring the DAO from code, or by creating a set of XML-based mapping files. The advent of Java 5 s annotation features, however, allows us to include these configuration details in the implementation of the entity itself. These are the annotations that you can see in Listing 4-11. With a correctly configured Hibernate session available, the DAO implementation then becomes a set of calls to the ORM engine. For comparison with the JdbcTemplate-based implementation that we looked at first, Listing 4-12 shows that a delete method can be created in a similarly compact form.

The emphasis in this book is on getting accurate information out of a database, but the data has to get in somehow. Most database application developers will provide user-friendly interfaces for inserting data into the various tables. Often a form is presented to the user for entering data that may end up in several tables. Figure 1-4 shows a simple Microsoft Access form that allows a user to enter and amend data in the Member table. It is also possible to construct web forms or mechanical readers (such as the bar-code readers at supermarkets) that collect data and insert it into a database. Behind all the different interfaces for updating data, SQL update queries are generated. I will show you three types of queries for inserting or changing data just so you get an idea of what they look like. I think you will find them quite easy to understand.

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