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Note Of course, pipelined PL/SQL functions deviate from normal PL/SQL functions. In normal PL/SQL

To use AWS, you need an account on Amazon.com. You can use your existing Amazon.com retail account, but you must also visit Amazon Web Services at http://aws.amazon.com and explicitly sign up for the various cloud services, such as EC2, that you intend to use.

Writing to that Stream object will send data to the client. Data that the client has sent to your server can be accessed by reading from the Stream. In Listing 21-6, you call the HandleClientStream method, which is where you will implement a custom network protocol later in this section. Note that it is the HandleClientStream method that you will want to modify if you are using this example as a template in your own program:

Once you have established what your XML messages and data types will look like, it is time to start building them. XSD schema files are the building blocks for XML messages, so you need to design the schema files first. XSD schema files may be coded by hand, but it is easier to use a visual designer tool, such as Visual Studio .NET s XML Designer. To access the designer, you simply add a new XSD schema file to a project. Visual Studio provides both a visual design view and an XML design view. Figure 3-3 illustrates the visual design view for StockTrader.xsd, which defines all of the data types for this chapter s StockTrader sample application.

<Serializable()> _ Public Class EditableChild Inherits BusinessBase(Of EditableChild) #Region "Business Methods" ' TODO: add your own fields, properties, and methods ' example with private backing field Private Shared IdProperty As PropertyInfo(Of Integer) = _ RegisterProperty(New PropertyInfo(Of Integer)("Id"))Integer)("Id")) Private _Id As Integer = IdProperty.DefaultValue Public Property Id() As Integer Get Return GetProperty(IdProperty, _Id) End Get Set(ByVal value As Integer) SetProperty(IdProperty, _Id, value) End Set End Property ' example with managed backing field Private Shared NameProperty As PropertyInfo(Of String) = _ RegisterProperty(New PropertyInfo(Of String)("Name")) Public Property Name() As String Get Return GetProperty(NameProperty) End Get Set(ByVal value As String) SetProperty(NameProperty, value) End Set End Property #End Region #Region "Validation Rules" Protected Overrides Sub AddBusinessRules() ' TODO: add validation rules 'ValidationRules.AddRule(RuleMethod, NameProperty) End Sub #End Region #Region "Authorization Rules" Protected Overrides Sub AddAuthorizationRules() ' TODO: add authorization rules 'AuthorizationRules.AllowWrite(NameProperty, "Role") End Sub Private Shared Sub AddObjectAuthorizationRules() ' TODO: add authorization rules 'AuthorizationRules.AllowEdit(GetType(EditableChild), "Role") End Sub #End Region #Region "Factory Methods" Friend Shared Function NewEditableChild() As EditableChild Return DataPortal.CreateChild(Of EditableChild)() End Function Friend Shared Function GetEditableChild( _ ByVal childData As Object) As EditableChild Return DataPortal.FetchChild(Of EditableChild)(childData) End Function

cm.CommandType = CommandType.StoredProcedure; cm.Parameters.Add( "@PageName", SqlDbType.VarChar, 400).Value = Request.Url.AbsoluteUri; cm.Parameters.Add( "@SessionID", SqlDbType.VarChar, 50).Value = vsk.Value; cm.Parameters.Add( "@StateData", SqlDbType.Image).Value = ms.ToArray(); cn.Open(); cm.ExecuteNonQuery(); cn.Close(); } protected override object LoadPageStateFromPersistenceMedium() { if (Request.Params["__VIEWSTATE_KEY"] == null) return null; string viewstatekey = Request.Params["__VIEWSTATE_KEY"].ToString(); SqlConnection cn = new SqlConnection(connStr); SqlCommand cm = new SqlCommand("usp_LoadState", cn); SqlDataReader dr = null; cm.CommandType = CommandType.StoredProcedure; cm.Parameters.Add( "@PageName", SqlDbType.VarChar, 400).Value = Request.Url.AbsoluteUri; cm.Parameters.Add( "@SessionID", SqlDbType.VarChar, 50).Value = viewstatekey; try { cn.Open(); dr = cm.ExecuteReader();

The detailed design issues around building an ASP.NET data source control are outside the scope of this book. Nonetheless, I ll walk quickly through the code in these classes to call out the highlights of the implementation. It turns out that implementing runtime functionality is relatively straightforward, but providing design time functionality is more complex. Table 10-7 lists the classes required to implement the CslaDataSource control s runtime and design time support.