ASP.NET PDF Viewer using C#, VB/NET

Struct object represents in a uniform fashion, in Java, database objects belonging to any given database object type It represents the database object as an array of attributes, which are stored in an array of Java objects (ie, Object[]) For example, using this technique, a database object of type person and a database object of type address can both be mapped to a single javasqlStruct object and initialized with an appropriate set of attributes In 10, we will discuss how to materialize objects as strongly typed objects in Java A strongly typed object refers to an object belonging to a custom Java class specifically created to represent a given database object type in Java For example, when we use strongly typed Java objects, a database object of type person object would map to a Java object of a custom.

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class, say Person, whereas a database object of type address would map to, for instance, a Java object of custom class Address. In 11, we will discuss how to materialize a database collection of built-in types (such as a varray of varchar2), a database collection of object types (such as a nested table of person objects), and database object references (references are defined in 11) as either weakly typed java.sql.Struct objects or as strongly typed custom class objects in Java. In addition, in this chapter and in s 10 and 11, we will cover how to manipulate data stored in tables containing objects or collections using either weakly typed or strongly typed Java objects. Although we will use tables with object columns in our examples for simplicity, the same code should work with object views as well, with appropriate triggers, as explained in 8 (regardless of whether we use weakly typed or strongly typed objects).

<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> </InsertParameters> </asp:SqlDataSource>

async { let req = WebRequest.Create("http://moma.org/") let! resp = req.GetResponseAsync() let stream = resp.GetResponseStream() let reader = new StreamReader(stream) let! html = reader.ReadToEndAsync() html } is shorthand for the following code: async.Delay(fun () -> async.Let(WebRequest.Async("http://moma.org/"), (fun req -> async.Bind(req.GetResponseAsync(), (fun resp -> async.Let(resp.GetResponseStream(), (fun stream -> async.Let(new StreamReader(stream), (fun reader -> async.Bind(reader.ReadToEndAsync(), (fun html -> async.Return(html)))))))))) As you saw in 9, the key to understanding the F# workflow syntax is always to understand the meaning of let!. In the case of async workflows, let! executes one asynchronous computation and schedules the next computation for execution once the first asynchronous computation completes. This is syntactic sugar for the Bind operation on the async object.

Note There are many tools and frameworks available outside the realm of JDBC that address the issue of

Execute the asynchronous computation expr and bind its result to pat when it completes. If expr has type Async<'a>, then pat has type 'a. Equivalent to async.Bind(expr,(fun pat -> ...)). Execute an expression synchronously and bind its result to pat immediately. If expr has type 'a, then pat has type 'a. Equivalent to async.Let(expr,(fun pat -> ...)). Equivalent to let! () = expr. Equivalent to let () = expr. Evaluate the expression, and return its value as the result of the containing asynchronous workflow. Equivalent to async.Return(expr). Execute the expression as an asynchronous computation, and return its result as the overall result of the containing asynchronous workflow. Equivalent to expr. Execute the expression immediately, and bind its result immediately. Call the Dispose method on each variable bound in the pattern when the subsequent asynchronous workflow terminates, regardless of whether it terminates normally or by an exception. Equivalent to async.Using(expr,(fun pat -> ...)).

Figure 11-1. An editable form created with no code using the SqlDataSource Queries can also be parameterized. This page uses a drop-down list to pick a publisher, and then renders a list of titles by that publisher when the user picks one (see ParamIE.aspx in the Web11 project). Figure 11-2 shows the results. <asp:SqlDataSource Runat=server ID=sdsPublishers ConnectionString="server=.;database=pubs;uid=sa;pwd=123123" SelectCommand="select pub_id, pub_name from publishers" /> <asp:DropDownList Runat=server ID=ddlPublishers DataSourceID='sdsPublishers' DataTextField='pub_name' AutoPostBack=true DataValueField='pub_id' />