.NET/ASP.NET/C#/VB.NET PDF Document SDK

The SqlDataSource is designed to talk to the most common source of data: the relational database. It enables you to connect to, execute commands against, and update the database without writing a single line of code.

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n the previous chapter, you learned how to make the best use of objects in Oracle In particular, you learned that you should avoid using objects to store data in a table Object views, on the other hand, allow you to create a layer of abstraction on top of relational tables, giving you the option of accessing objects directly from your code, while also retaining the flexibility of writing code that works on the underlying relational tables using traditional SQL Even though it is not, in general, advisable to store data in object tables, it still makes sense to discuss how to work with objects using JDBC, for the following reasons: Even if you don t store objects in tables, you may have to pass Oracle objects back and forth between Java and your stored procedures that take objects as parameters.

Cancellation is controlled through the use of asynchronous groups, a topic covered at http://www expert-fsharpcom/Topics/Cancellation Resource lifetime management is fairly simple: You can protect resources across parts of an asynchronous computation by using use inside the workflow syntax If we put aside the question of cancellation, values of type Async<'a> are effectively identical to the following type: type Async<'a> = Async of ('a -> unit) * (exn -> unit) -> unit Here the functions are the success continuation and exception continuations, respectively Each value of type Async<'a> should eventually call one of these two continuations The async object is of type AsyncBuilder and supports the following methods, among others: type AsyncBuilder with member Return : 'a -> Async<'a> member Delay : (unit -> Async<'a>) -> Async<'a> member Using: 'a * ('a -> Async<'b>) -> Async<'b> when 'a :> System.

Since this would be also true for stored procedures that use objects as programming constructs rather than as a storage mechanism, it is useful to learn these concepts The idea of accessing and manipulating objects is an integral part of the JDBC API, and this book would be incomplete without a discussion of this topic You need to be familiar with accessing objects from object tables, in case you encounter code that uses the concepts involved In this chapter and the next two chapters, you will learn different options available for mapping Oracle database objects and collections to objects in Java In this chapter, we will discuss how to materialize database objects as weakly typed objects in Java A weakly typed object refers to a Java object that implements the javasqlStruct interface A javasql.

The SqlDataSource control also supports inserts, updates, and deletes. This markup will render a form interface for displaying, editing, and navigating to different rows in the authors table (see DetailsViewIE.aspx in the Web11 project). Figure 11-1 shows the output of the following control declarations. <asp:DetailsView ID="DetailsView1" Runat="server" DataSourceID='sdsAuthors' AutoGenerateDeleteButton=true AutoGenerateEditButton=true AutoGenerateInsertButton=true AllowPaging="True" AutoGenerateRows="true" DataKeyNames="au_id"> </asp:DetailsView> <asp:SqlDataSource Runat=server ID=sdsAuthors ConnectionString="server=.;database=pubs;uid=sa;pwd=123123" SelectCommand="SELECT * FROM [authors]" ProviderName="System.Data.SqlClient" DeleteCommand="DELETE FROM [authors] WHERE [au_id] = @original_au_id" InsertCommand="INSERT INTO [authors] ([au_id], [au_lname], [au_fname], [phone], [address], [city], [state], [zip], [contract]) VALUES (@au_id, @au_lname, @au_fname, @phone, @address, @city, @state, @zip, @contract)" UpdateCommand="UPDATE [authors] SET [au_lname] = @au_lname, [au_fname] = @au_fname, [phone] = @phone, [address] = @address, [city] = @city, [state] = @state, [zip] = @zip, [contract] = @contract WHERE [au_id] = @original_au_id"> <DeleteParameters> <asp:Parameter Type="String" Name="au_id"></asp:Parameter> </DeleteParameters> <UpdateParameters> <asp:Parameter Type="String" Name="au_lname"></asp:Parameter> <asp:Parameter Type="String" Name="au_fname"></asp:Parameter> <asp:Parameter Type="String" Name="phone"></asp:Parameter> <asp:Parameter Type="String" Name="address"></asp:Parameter> <asp:Parameter Type="String" Name="city"></asp:Parameter> <asp:Parameter Type="String" Name="state"></asp:Parameter> <asp:Parameter Type="String" Name="zip"></asp:Parameter> <asp:Parameter Type="Boolean" Name="contract"></asp:Parameter> <asp:Parameter Type="String" Name="au_id"></asp:Parameter> </UpdateParameters> <InsertParameters> <asp:Parameter Type="String" Name="au_id"></asp:Parameter> <asp:Parameter Type="String" Name="au_lname"></asp:Parameter> <asp:Parameter Type="String" Name="au_fname"></asp:Parameter> <asp:Parameter Type="String" Name="phone"></asp:Parameter>

IDisposable member Let: 'a * ('a -> Async<'b>) -> Async<'b> member Bind: Async<'a> * ('a -> Async<'b>) -> Async<'b> The full definition of Async<'a> values and the implementations of these methods for the async object are given in the F# library source code As you saw in 9, builder objects such as async containing methods like those shown previously mean that the syntax async { .. } can be used as a way of building Async<'a> values Table 13-2 shows the common constructs used in asynchronous workflow expressions For example, the following asynchronous workflow:.