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<HEAD> <TITLE>Hello ASP World</TITLE> </HEAD> <BODY> <CENTER> <% Dim x For x=1 to 5 Response.Write("<FONT size=" & x) Response.Write(">Hello ASP World</FONT><BR>" & vbCrLf) Next %> </CENTER> </BODY> </HTML>
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The SayHelloASP application s output is shown in Figure 1-4.
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Figure 1-4: The output from the SayHelloASP sample in Listing 1-3 The SayHelloASP example is a little grander than the previous SayHelloCGI and SayHelloISAPI examples, to show you some of the power of ASP. Rather than simply displaying Hello ASP World a single time, here the text is displayed in a loop, with the text gradually increasing in size. The first line in Listing 1-3 is a directive to the VBScript engine, Option Explicit. This directive instructs VBScript to insist that all variables be explicitly declared. (I ll elaborate on that directive and its implications in the section The Bad News About ASP later in this chapter.) The directive is enclosed within a <% and %> character pair. This character pair represents the start and end delimiters for scripting within an ASP page. Scripting to be executed on the client can be enclosed within the <SCRIPT></SCRIPT> tags. What follows in the next six lines is standard HTML code, just like you would see in a typical HTML file. After these six lines, the code enters another section of script (denoted by the <% delimiter). A variable named x is declared, but notice that the variable isn t
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declared as any particular type of variable. A For loop increments x from 1 through 5, and within the loop, the Write method of the Response object is used. The Response object is made available to all ASP pages, along with several other objects, including Request, Server, Session, and Application objects. At the end of the loop, the script section is terminated using a %> delimiter, and then I finish up with a few lines of standard HTML. The For loop could also be written as follows: <% Dim x For x = 1 To 5 %> <FONT size=<%=x %>>Hello ASP World</FONT><BR> <% Next %> In this version, the loop doesn t use the Response.Write method to write out the five versions of the Hello ASP World line. Instead, the font tag and the text are written directly, with one special string, <%=x %>. Within HTML code on an ASP page, using <%= followed by a variable and an end delimiter (%>) is a shortcut for using Response.Write to write a variable to the HTML stream. Note Using the <%= variable%> syntax has some debugging implications. If you receive an error message related to, for example, the variable not being declared, the message might refer to Response.Write(variable) rather than the actual syntax used. If you receive an error message referring to code you don t actually have in your script, you should look at these kinds of script shortcuts. The Good News About ASP ASP became an instant hit, in large part because it made something that was difficult (create dynamic Web content) relatively easy. Creating CGI applications and ISAPI applications wasn t terribly difficult, but using ASP was much simpler. By default, ASP uses VBScript. Literally millions of developers are at least somewhat familiar with Visual Basic, Visual Basic for Applications (VBA), or VBScript. For these developers, ASP was the way to enter the Internet age. Certainly the developers could have learned a new programming language, but they didn t have to with ASP. Partly because of its use of VBScript, ASP became a viable way to build Web applications. Just as important was the relatively easy access to databases allowed through Microsoft ActiveX Data Objects (ADO). When you need to generate dynamic content, that dynamic content obviously needs to come from somewhere, and ADO made it easy to get at that data. Finally, and perhaps most important, the ASP development model allowed developers to essentially write code and run it. There was no need to perform compilation or elaborate installation steps. As you ll see in 4, the ASP.NET architects were careful to capture this same development model, even though what s going on under the covers is quite a bit different. The Bad News About ASP ASP is a powerful tool for Web developers who need to build large, scalable Web applications. Web sites such as www.microsoft.com and www.dell.com and many other sites large and small have used ASP with great success. I have no experience on such massive Web sites, but I ve done a fair amount of work with ASP on a moderate-size site for SportSoft Golf, www.golfsocietyonline.com. Much of my experience with real-world Internet application scalability comes from working with this site, which I think is fairly representative of such moderate-size sites.
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The first thing I looked into when considering ASP on sites larger than single-server intranet sites was the overhead of interpreting the VBScript or JScript code on each request. To my great surprise, with just a few notable exceptions, ASP was almost always fast enough. On most moderate-size ASP sites, more bottlenecks are caused by database access and updates than by the ASP scripting engine. Later versions of ASP have become increasingly efficient in serving up pages, even pages with somewhat complex scripting.
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Why Is VBScript String Manipulation So Slow My background is very heavy on C and C++, much lighter on Visual Basic, VBA, and VBScript. One of my greatest complaints about Visual Basic in general, and VBScript in particular, was the seemingly abysmal string handling performance. For instance, to use a silly example, try to append 50,000 A s to a string in Visual Basic, like so: Private Sub GoSlow_Click() Dim tstr As String Dim tloop As Long
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For tloop = 1 To 50000 tstr = tstr & "A" Next MsgBox "Done" End Sub On my 400 MHz Dual Pentium machine, this code takes about 12 seconds to run. This is an extreme example, of course, but it surely shouldn t take that long to append characters to a string, even 50,000 of them. Bob Snyder, active in the Microsoft Access and Visual Basic communities, showed me a better way to achieve the same results in a much more efficient manner, as shown here: Private Sub GoFast_Click() Dim tstr As String Dim tloop As Long
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