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Introduction to LinqToSQL AWW YEA FOO!

Introduction to LinqToSQL AWW YEA FOO!. Jonas Avellana TYCO Thermal Controls. Who is Jonas?. Work for. Let’s Start. What is LINQ? Short for Language-Integrated Query An “SQL”-like syntax to query in-memory collections Frikken awesome! Why LINQ? DEMO. What is LinqToSQL ?

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Introduction to LinqToSQL AWW YEA FOO!

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  1. Introduction to LinqToSQLAWW YEA FOO! Jonas Avellana TYCO Thermal Controls

  2. Who is Jonas? • Work for

  3. Let’s Start • What is LINQ? • Short for Language-Integrated Query • An “SQL”-like syntax to query in-memory collections • Frikken awesome! • Why LINQ? • DEMO

  4. What is LinqToSQL? • Another OR\M • Queries are written in LINQ • Instead of in-memory collection queries, we go to a SQL Server database • One-to-one implementation

  5. Other ORM’s • NHibernate • Castle ActiveRecord (Runs under NHibernate) • Linq To Entities (Microsoft’s “NHibernate”) • Many more!

  6. Scenario • Photo Album • Has many photos • Has many sets • A set can have many photos • A set has details • A.K.A. Jonas’ Ghetto Flickr

  7. Database Diagram

  8. UML

  9. Pros • Very easy to write LINQ • No more mapping files (Photo.hbm.xml) • Can be used with existing SQL Server databases • Can call SQL & Stored Procs • Less string keys to use that may cause errors (gateway.CreateParameter(“itemId”, item.ItemId)) • Lazy Loading!

  10. Cons • SQL Server only. • Could be slower than other ORM or hand rolled data access objects. • Could be a pain to maintain if you use the LinqToSql designer (drag + drop) if you keep on refactoring your database • May cause multiple database calls • Can be avoided with DataLoadOptionsor with a proper IQueryable<T> query

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