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LINQ to SQL involves using entity classes, where each entity class is typically mapped to a single database table. However, using entity class inheritance mapping, it is possible to map an entire class hierarchy to a single table under special circumstances. You can read more about this in 18. So, we have entity classes mapping to database tables, and the entity class properties get mapped to table columns. This entity class-to-table and property-to-column mapping is the essence of LINQ to SQL.

This option allows you to specify the timeout value in seconds to use for database commands Omitting this option will cause SQLMetal to default to 0, which means never timeout At this time, this option is not supported, and no changes will exist in the generated code because of this option You may want to check to see if this option works in your installation of Visual Studio 2008 If this option does not work, consider setting the CommandTimeout property of the DataContext class, or for even more granular control, call the DataContext GetCommand method to set the timeout for a specific query See Listing 16-29 in 16 for an example doing this Specify this option to have SQLMetal generate the necessary Table<T> properties and entity classes to support the specified database s views Specify this option to have SQLMetal generate methods to call the specified database s user-defined functions.

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N ote The essence of LINQ to SQL is mapping entity classes to database tables and entity class properties to database table columns.

You need to create custom actions for the renderer-specific ProShowOneDeck component and the behavioral UIShowItem component; in addition, you need to create a custom action for adding a ShowListener to the ProShowOneDeck component.

Specify this option have SQLMetal generate methods to call the specified database s stored procedures This option specifies the file name for a DBML intermediate file The purpose of generating this file is so that you control class and property names of the generated entity classes You would generate the dbml intermediate file with this option, edit the file, and then create a source code module by calling SQLMetal on the intermediate dbml file and specifying the /code option Alternatively, you could load the DBML intermediate file created with this option into the Object Relational Designer, edit the file in the designer using its GUI, and allow the designer to generate the necessary source code This option cannot be used with the /map option This is the file name for SQLMetal to create containing the derived DataContext and entity classes in the specified programming language.

This mapping can occur directly in class source files by decorating classes with the appropriate attributes, or it can be specified with an external XML mapping file. By using an external XML mapping file, the LINQ-to-SQL-specific bits can be kept external to the source code. This could be very handy if you don t have source code or want to keep the code separated from LINQ to SQL. For the majority of examples in the LINQ to SQL chapters, we will be using entity classes that have been generated by the SQLMetal command-line tool. SQLMetal generates the entity classes with the LINQ to SQL mapping bits right in the source module it generates. These mapping bits are in the form of attributes and attribute properties. You will be able to detect the existence of entity classes in our examples when you see classes or objects that have the singular form of a Northwind database table name. For example, in Listing 12-1, we use a class named Customer. Because Customer is the singular form of Customers and the Northwind database has a table named Customers, this is your clue that the Customer class is an entity class for the Northwind database s Customers table. The SQLMetal command-line tool has an option called /pluralize that causes the entity classes to be named in the singular form of the database table name. Had we not specified the /pluralize option when generating our entity classes, our entity class would be named Customers, as opposed to Customer, because the name of the table is Customers. We mention this in case you get confused reading other writings about LINQ to SQL. Depending on how the author ran the SQLMetal tool and what options were specified, the entity class names may be plural or singular.

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