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LINQ to SQL LINQ to DataSet LINQ to SQL allows querying a relational structure by converting the LINQ query into a native SQL query This means… that the queries that you write in code generates appropriate queries to access the actual database, AUTOMATICALLY! There are several concepts that you will come to know in this module… ◦ How is the query written using object names (like tables or views)? ◦ How is it validated by the compiler? ◦ When is the query generated? ◦ When is the query executed? You could either… ◦ Create a class and annotate it with the Table name ◦ Define Fields (which correspond to columns) ◦ Get the Data context (The DataContext class handles the communication between LINQ and external relational data sources) ◦ Create a Generic type ◦ Query through LINQ OR… use LINQ to SQL Classes in VS 2008 Data abstraction Working with Strongly Typed objects Tied to the object model and NOT to the database Query semantics is much more meaningful Right now, ONLY SQL is supported, but going forward there will be more providers which would provide access to different databases Once new providers come in, you could connect to any database with virtually the same code base ... LINQ to SQL LINQ to DataSet LINQ to SQL allows querying a relational structure by converting the LINQ query into a native SQL query This means… that... DataContext class handles the communication between LINQ and external relational data sources) ◦ Create a Generic type ◦ Query through LINQ OR… use LINQ to SQL Classes in VS 2008 Data abstraction... the queries that you write in code generates appropriate queries to access the actual database, AUTOMATICALLY! There are several concepts that you will come to know in this module… ◦ How is the
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