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662 ChAPTER 11
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Connecting to and Querying Data with LINQ
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Sample of C# Code DatabaseSchema dbSchema = new DatabaseSchema(); DataSet titlesDs = dbSchema.GetTitles(); var titleQuery = from title in titlesDs.Tables["titles"].AsEnumerable() where title.Field<int>("ytd_sales") > 1000 orderby title.Field<decimal>("price") select title.Field<decimal>("price"); var prices = titleQuery.Distinct(); GridView1.DataSource = prices; GridView1.DataBind();
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As another example, the following code executes two queries against the titles DataSet. The first query returns all titles that were written with an advance of $5,000 or more. The second query returns all titles with year-to-date sales greater than $3,000. These queries are each converted into separate DataTable objects by using the CopyToDataTable method. Finally, the Intersect method is called to return all titles that match between the two DataSet objects.
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Sample of Visual Basic Code Dim dbSchema As DatabaseSchema = New DatabaseSchema() Dim titlesDs As DataSet = dbSchema.GetTitles() Dim titleAdvQuery = From title In titlesDs.Tables("titles") Where title.Field(Of Decimal)("advance") > 5000 Select title Dim titleSalesQuery = From title In titlesDs.Tables("titles") Where title.Field(Of Integer)("ytd_sales") > 3000 Select title Dim dtAdvance As DataTable = titleAdvQuery.CopyToDataTable() Dim dtSales As DataTable = titleSalesQuery.CopyToDataTable() Dim advanceSales As IEnumerable(Of DataRow) = _ dtAdvance.AsEnumerable().Intersect( _ dtSales.AsEnumerable(), DataRowComparer.Default) GridView1.DataSource = advanceSales.CopyToDataTable() GridView1.DataBind() Sample of C# Code DatabaseSchema dbSchema = new DatabaseSchema(); DataSet titlesDs = dbSchema.GetTitles(); var titleAdvQuery = from title in titlesDs.Tables["titles"].AsEnumerable() where title.Field<decimal>("advance") > 5000 select title;
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Lesson 2: LINQ and ADO.NET
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ChAPTER 11
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var titleSalesQuery = from title in titlesDs.Tables["titles"].AsEnumerable() where title.Field<int>("ytd_sales") > 3000 select title; DataTable dtAdvance = titleAdvQuery.CopyToDataTable(); DataTable dtSales = titleSalesQuery.CopyToDataTable(); IEnumerable<DataRow> advanceSales = dtAdvance.AsEnumerable().Intersect( dtSales.AsEnumerable(), DataRowComparer.Default); GridView1.DataSource = advanceSales.CopyToDataTable(); GridView1.DataBind();
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LINQ to SQL
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LINQ to SQL is a technology in ADO.NET built to work directly with a SQL Server database to enable LINQ-style programming against it. With LINQ to SQL, you build an object-relational (O/R) map that connects .NET classes to database elements. This O/R map can be built in several ways (which will be discussed later in this section). After the map is built, you can program against your database as if you were writing code against objects (because you are). This greatly simplifies and accelerates database development. Instead of writing SQL script and code that is not strongly typed, you are able to write .NET, object-oriented code to work with your database.
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Note
LinQ TO sQL vs. LinQ TO EnTiTiEs
Microsoft has released the Entity Framework, which provides similar features as LINQ to SQL but is not so directly tied to SQL Server. If you are writing a new application, you might want to consider the Entity Framework as an alternative to LINQ to SQL. The Entity Framework is covered in the next section.
To enable LINQ to SQL programming, you must follow a few basic steps before you can get started writing LINQ code against your database. The following is an overview:
Add a reference to the System.Data.Linq namespace to your project. This namespace contains the DataContext object, which is the core object that connects the database to the O/R map. Create an O/R map that connects objects to data tables, columns, and more. There are multiple ways to create an O/R map in the .NET Framework. We look at three of them in the next section.
664 ChAPTER 11
Connecting to and Querying Data with LINQ
3. 4.
Connect to your database by using the LINQ to SQL DataContext object. Again, this object represents the pipeline between the database and your objects. Use the features of LINQ and LINQ to SQL to work with your database. For instance, you can write queries by using strongly typed objects. In addition, you can use the features of LINQ to SQL to insert, update, and delete data.
It is important to note that LINQ to SQL is part of ADO.NET. Therefore, you can use it with other ADO.NET components, such as transactions. This allows you to build LINQ to SQL items but still take advantage of any existing objects you ve written against ADO.NET. In addition, LINQ to SQL allows you to use your existing database code, including stored procedures.
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