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You can use anonymous types and the var keyword in your queries to have the compiler infer the types in the query, whether simple or complex You can use lambda expressions in your queries to define a method for evaluating the stored data, and then project the results onto a variable The join clause can unite the data from two different collections, but it has a special syntax, requiring the name of the collection to join with, the field you re joining on in each collection, and the fields that should be in the return set LINQ to SQL classes allows you to use the LINQ syntax to query a SQL database You need to include a reference to the SystemDataLinq namespace to use LINQ to SQL.

In the Java code, we need to handle the form submission and the creation of the objects used to hold the registration information. Since the EJB3 service methods that we will be interacting with take DTOs as parameters, we need an instance of the DynaDTO builder factory to create the necessary objects. Listing 7-32 shows the Java implementation of the Register page. In the pageBeginRender listener, we create and set the DTO objects that will carry the data from the form to the form listener all the way down to the EJB3 service. Listing 7-32. Register Page Implementation package com.integrallis.techconf.web.tapestry.pages.attendee; ... public abstract class Register extends ActiveConferencePage { /** DynaDTO builders */ private Builder attendeeBuilder = null; private Builder addressBuilder = null; ...

Figure 2 shows the configuration console with the configuration used in the example application for this chapter. It defines a rule set named MyRuleset for the validated type (the Product class). MyRuleset is configured as the default rule set, and contains a series of validators for all of the properties of the Product type. These validators include two Or Composite Validators (which contain other validators) for the DateDue and Description properties, three validators that will be combined with the And operation for the ID property, and individual validators for the remaining properties. When you highlight a rule, member, or validator in the configuration console, it shows connection lines between the configured items to help you see the relationships between them. Specifying Rule Sets When Validating You can specify a rule set name when you create a type validator that will validate an instance of a type. If you use the ValidatorFactory facade to create a type validator for a type, you can specify a rule set name as a parameter of the CreateValidator method. If you create an Object Validator or an Object Collection Validator programmatically by calling the constructor, you can specify a rule set name as a parameter of the constructor. Finally, if you resolve a validator for a type through the Enterprise Library Container, you can specify a rule set name as the string key value. We look in more detail at the options for creating validators later in this chapter. If you specify a rule set name when you create a validator for an object, the Validation block will apply only those validation rules that are part of the specified rule set. It will, by default, apply all rules with the specified name that it can find in configuration, attributes, and self-validation.

Next, define an InsertQuery for the SqlDataSource control. You do so by selecting the SqlDataSource control from the Default.aspx page in Design view. Then click the ellipsis button next to the InsertQuery property in the Properties pane. This will launch the Command And Parameter Editor.

The following example illustrates default DNS query behavior. In the example, the cli ent queries its preferred DNS server, which then performs recursion by querying hier archically superior DNS servers. In the example, the DNS client and all DNS servers are assumed to have empty caches. In the example shown in Figure 4-4, a client somewhere on the Internet needs to resolve the name example.lucernepublishing.com to an IP address.

The following field properties apply to every field:

LINQ to SQL allows you to use attributes on classes so that they behave like tables, and on properties so that they behave like columns LINQ to SQL also features a DataContext class that can take a connection string in the constructor The Object Relational Designer adds a visual component to LINQ to SQL classes You can drag-and-drop database tables directly onto the design surface, and the O/R Designer will supply appropriate backing code for the classes that represent the data You can use the automatically created classes as though they were ordinary classes in your code, simplifying database access LINQ is a remarkable new technology that has the potential to partially bridge the gap that s existed between software development and database administration..

Figure 10-7

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