Equally important is the discussion of using LINQ to SQL in a multi-tier environment and other
topics, such as external mapping with LINQ to SQL and entity classes.
Therefore, this chapter will discuss the following:
??‘ Object Relational Designer
??‘ SQL Metal tool
??‘ External mapping
??‘ Multi-tier operations
Object Relational Designer
The O/R Designer (Object Relational Designer) is a tool that provides the ability to create and manage
LINQ to SQL entity classes, their associated relationships, and mappings through a graphical
user interface. Through the O/R Designer you create an object model thatmaps entity classes within
your application to objects within your database, such as tables and stored procedures. Instead of
creating and defining these mappings by hand as you have done in previous chapters, the O/R
Designer provides a graphical user interface in which you can accomplish these tasks.
Part III: LINQ to SQL
Creating and Opening the O/R Designer
The Object Relational Designer is created by adding a specific file type to your Visual Studio project.
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