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1.NET Language Integrated Query Yishai Zaltzberg
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2 Agenda: Why LINQ? What is LINQ Code samples Compare to code without LINQ Simple query Working with Xml Aggregation Join Use SP Etc. Impact and performance. Questions ?
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3 Classic ADO.NET SqlConnection conn = new SqlConnection(“...“); SqlCommand cmd = conn.CreateCommand(); cmd.CommandText = @“ SELECT * FROM Vehicles WHERE Model = @Model"; cmd.Parameters.Add("@Model", “Mercedes“); SqlDataReader r = cmd.ExecuteReader(); while ( r.HasRows ) { Console.WriteLine(r[“Number"] + r[“Year"]); } SqlConnection conn = new SqlConnection(“...“); SqlCommand cmd = conn.CreateCommand(); cmd.CommandText = @“ SELECT * FROM Vehicles WHERE Model = @Model"; cmd.Parameters.Add("@Model", “Mercedes“); SqlDataReader r = cmd.ExecuteReader(); while ( r.HasRows ) { Console.WriteLine(r[“Number"] + r[“Year"]); } Application Relational Database No intellisence No compile time checks Untyped Results
![3 Classic ADO.NET SqlConnection conn = new SqlConnection( ... ); SqlCommand cmd = conn.CreateCommand(); cmd.CommandText SELECT * FROM Vehicles WHERE Model ; , Mercedes ); SqlDataReader r = cmd.ExecuteReader(); while ( r.HasRows ) { Console.WriteLine(r[ Number ] + r[ Year ]); } SqlConnection conn = new SqlConnection( ... ); SqlCommand cmd = conn.CreateCommand(); cmd.CommandText SELECT * FROM Vehicles WHERE Model ; , Mercedes ); SqlDataReader r = cmd.ExecuteReader(); while ( r.HasRows ) { Console.WriteLine(r[ Number ] + r[ Year ]); } Application Relational Database No intellisence No compile time checks Untyped Results](http://images.slideplayer.com./26/8419609/slides/slide_3.jpg "3 Classic ADO.NET SqlConnection conn = new SqlConnection( ... ); SqlCommand cmd = conn.CreateCommand(); cmd.CommandText SELECT * FROM Vehicles WHERE Model ; , Mercedes ); SqlDataReader r = cmd.ExecuteReader(); while ( r.HasRows ) { Console.WriteLine(r[ Number ] + r[ Year ]); } SqlConnection conn = new SqlConnection( ... ); SqlCommand cmd = conn.CreateCommand(); cmd.CommandText SELECT * FROM Vehicles WHERE Model ; , Mercedes ); SqlDataReader r = cmd.ExecuteReader(); while ( r.HasRows ) { Console.WriteLine(r[ Number ] + r[ Year ]); } Application Relational Database No intellisence No compile time checks Untyped Results")
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4 XML Objects Relational Data
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5 Samples
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6 Simple Xml Build – Before LINQ
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7 Simple Xml Build
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8 Before LINQ
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9 Build Xml from DB
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