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Although the Entity Framework is technically part of ADONET (and it uses the familiar ADONET classes behind the scenes), when you use the Entity Framework, you don t worry about these details Instead of writing your own ADONET code, you let the Entity Framework take care of all the details for you This sort of automatic code-generation system is nothing new In fact, hundreds of companies and independent developers have spent years inventing their own technologies that automatically build data code Some of these technologies are quite good (and some even resemble the Entity Framework) However, many suffer from serous limitations.

Whether you realize it at first, every piece of code in .NET exists inside a .NET type (typically a class). In turn, every type exists inside a namespace. Figure 3-3 shows this arrangement for your own code and the DateTime class. Keep in mind that this is an extreme simplification the System namespace alone is stocked with several hundred classes. This diagram is designed only to show you the layers of organization.

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Although they make the programmer s life easier for basic database operations, they fail to deal with more sophisticated scenarios such as calling stored procedures, working with different types of relational database products, translating data into different representations, dealing with errors, and assembling data from multiple tables into a single set of objects Although the Entity Framework isn t a complete replacement for traditional ADONET, it deals with all these issues, which makes it a practical option for developers who need to quickly create datadriven applications..

Public Class DBUtil Private connectionString As String Public Sub New() connectionString = _ WebConfigurationManager.ConnectionStrings( _ "AdBoard").ConnectionString End Sub

Note In fact, the Entity Framework is a replacement for a similar Microsoft technology called LINQ to SQL,

Public Function GetCategories() As DataSet Dim query As String = "SELECT * FROM Categories" Dim cmd As New SqlCommand(query) Return FillDataSet(cmd, "Categories") End Function Public Function GetItems() As DataSet Dim query As String = "SELECT * FROM Items" Dim cmd As New SqlCommand(query) Return FillDataSet(cmd, "Items") End Function Public Function GetItems(ByVal categoryID As Integer) As DataSet ' Create the Command. Dim query As String = "SELECT * FROM Items WHERE Category_ID=@CategoryID" Dim cmd As New SqlCommand(query) cmd.Parameters.AddWithValue("@CategoryID", categoryID) ' Fill the DataSet. Return FillDataSet(cmd, "Items") End Function Public Sub AddCategory(ByVal name As String) Dim con As New SqlConnection(connectionString) ' Create the Command. Dim insertSQL As String = "INSERT INTO Categories " insertSQL &= "(Name) VALUES @Name" Dim cmd As New SqlCommand(insertSQL, con) cmd.Parameters.AddWithValue("@Name", name) Try con.Open() cmd.ExecuteNonQuery() Finally con.Close() End Try End Sub Public Sub AddItem(ByVal title As String, ByVal description As String, _ ByVal price As Decimal, ByVal categoryID As Integer) Dim con As New SqlConnection(connectionString)

Determines if a given offset exists in the array Sets or replaces the data at a given offset Returns the data at a given offset Nullifies data at a given offset

which was released with .NET 3.5. Although LINQ to SQL is still in use today and has many similarities to the Entity Framework, it also has disadvantages. Most obviously, it doesn t work with databases other than SQL Server, and it doesn t give developers the flexibility to use data objects that don t exactly match the underlying tables.

' Create the Command. Dim insertSQL As String = "INSERT INTO Items " insertSQL &= "(Title, Description, Price, Category_ID)" insertSQL &= "VALUES (@Title, @Description, @Price, @CategoryID)" Dim cmd As New SqlCommand(insertSQL, con) cmd.Parameters.AddWithValue("@Title", title) cmd.Parameters.AddWithValue("@Description", description) cmd.Parameters.AddWithValue("@Price", price) cmd.Parameters.AddWithValue("@CategoryID", categoryID) Try con.Open() cmd.ExecuteNonQuery() Finally con.Close() End Try End Sub Private Function FillDataSet(ByVal cmd As SqlCommand, ByVal tableName As String) _ As DataSet Dim con As New SqlConnection(connectionString) cmd.Connection = con Dim adapter As New SqlDataAdapter(cmd) Dim ds As New DataSet() Try con.Open() adapter.Fill(ds, tableName) Finally con.Close() End Try return ds End Function End Class

The Entity Framework isn t for everyone. If you re already comfortable using the traditional ADO.NET objects, you may find that the Entity Framework adds little benefit but introduces additional

When a DBUtil object is created, the constructor automatically retrieves the connection string from the web.config file, using the technique described in 5. However, it s important to note that this is the web.config file of the web application (as the component doesn t have a configuration file). This is a good design, because it allows a website to use the database component with any database server. However, if the client web application doesn t have the appropriate configuration setting, the database component won t work.

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