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calling the SubmitChanges method. That s not much code considering it is also detecting concurrency conflicts and resolving them if they occur. Run Listing 12-1 by pressing Ctrl+F5. There is no console output, but if you check the database, you should see that the ContactName for customer LAZYK is now "Ned Plimpton".

N ote This example makes a change to the data in the database without changing it back. The original value of the ContactName for customer LAZYK is "John Steel". You should change this back so that no subsequent examples behave improperly. You could change it manually, or you could just change the example code to set it back, and run the example again.

So what is the problem you ask For this discussion, assume you are the developer responsible for designing a new way to query multitudes of objects. Let s say you decide to create a Where method to help with the where clauses. How would you do it Would you make the Where operator an instance method If so, to what class would you add that Where method You want the Where method to work for querying any collection of objects. There just

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The renderer-specific ProShowOneDeck subclass is registered in faces-config.xml, as shown in Code Sample 3-32. Code Sample 3-32. Registering the ProShowOneDeck Renderer-Specific Subclass < xml version="1.0" encoding="UTF-8" > <!DOCTYPE faces-config PUBLIC "-//Sun Microsystems, Inc.//DTD JavaServer Faces Config 1.1//EN" "http://java.sun.com/dtd/web-facesconfig_1_1.dtd"> <faces-config> <component> <component-type> com.apress.projsf.ProShowOneDeck </component-type> <component-class> com.apress.projsf.ch3.component.pro.ProShowOneDeck </component-class> <!-- UIComponent attributes --> <attribute> <attribute-name>id</attribute-name> <description> The component identifier for this component. This value must be unique within the closest parent component that is a naming container. </description> </attribute> <attribute> <attribute-name>rendered</attribute-name> <attribute-class>boolean</attribute-class> <default-value>true</default-value> <description> Flag indicating whether or not this component should be rendered (during Render Response Phase), or processed on any subsequent form submit. </description> </attribute> <attribute> <attribute-name>binding</attribute-name>

This book uses an extended version of the Northwind database. Please read the section in this chapter titled Obtaining the Appropriate Version of the Northwind Database for details.

isn t a logical class to add the Where method to. Taking this approach, you would have to modify a zillion different classes if you want universal data querying capability. So now that you realize the method must be static, what is the problem Think of your typical (SQL) query and how many where clauses you often have. Also consider the joins, grouping, and ordering. Let s imagine that you have created the concept of a new data type, a sequence of generic data objects that we will call an Enumerable. It makes sense that the Where method would need to operate on an Enumerable (of data) and return another filtered Enumerable. In addition, the Where method will need to accept an argument allowing the developer to specify the exact logic used to filter data records from or into the Enumerable. This argument, that I will call the predicate, could be specified as a named method, an anonymous method, or a lambda expression.

At this point, we have discussed using LINQ with in-memory data collections and arrays, XML, and DataSets Now, we will move on to what many think is the most compelling reason to use LINQ, LINQ to SQL LINQ to SQL is an application programming interface (API) for working with SQL Server databases In the current world of object-oriented programming languages, there is a mismatch between the programming language and the relational database When writing an application, we model classes to represent real-world objects such as customers, accounts, policies, and flights We need a way to persist these objects so that when the application is restarted, these objects and their data are not lost However, most production-caliber databases are still relational and store their data as records in tables, not as objects.

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