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

You now know three approaches of storing parent/child type of data: good old relational tables, nested tables, and object views on top of relational tables. Which ones should you use Since this book is focused on performance, we will compare these three methods to see which ones fare better as far as performance goes. Intuitively, an approach based on relational tables should outperform the other two approaches. However, we still need to ascertain by approximately how much. Also, it would be interesting to know the difference in performance between the nested table based approach and the object view based approach, as they are more or less equivalent in functionality and expressiveness (once all the instead of triggers on the object view are in place). So without further ado, let s look at the package that compares insert, delete, and update on the three approaches based on the schema that we created earlier. The package will perform various DML operations on the relational schema, the schema that used nested tables to store data, and the object view based schema that we examined earlier. I explain the code in comments interspersed within the package code. benchmark@ORA10G> create or replace package or_nt_rel_pkg 2 as 3 g_num_of_select_runs constant number := 10000; 4 g_num_of_child_updates constant number := 10000; 5 part_rel_id number := 1; 6 part_or_id number := 1; 7 part_nt_id number := 1; 8 9 procedure do_or_select; 10 procedure do_nt_select; 11 procedure do_rel_select; 12 procedure do_or_insert( p_num_of_parents in int := 50, 13 p_num_of_children in int := 500 ); 14 procedure do_nt_insert( p_num_of_parents in int := 50, 15 p_num_of_children in int := 500 );

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<tr> <td>Last Name</td> <td> <asp:TextBox Runat=server ID=txtLastName /> </td> </tr> <tr><td colspan=2 align=center> <asp:Button Runat=server ID=btnSave Text='Save' OnClick="btnSave_Click" /> </td></tr> </table> <uc1:Timestamp ID="tsAuthor" Runat="server" /> </asp:Panel> <br /><br /><asp:Label Runat=server ID=lblOutput /> To facilitate reuse of this logic across several tables, you ll encapsulate the timestamp value in a user control. You can also do this with a custom control, making it usable across different applications. Here s the markup for the user control. (This code is in Timestamp.ascx of the Web10 project.) <%@ Control Language="C#" CodeFile="Timestamp.ascx.cs" Inherits="Timestamp_ascx" %> <asp:TextBox Runat=server ID=txtTimestamp Visible=false /> It gets included on your edit page with the following register directive from Concurrency3.aspx: <%@ Register TagPrefix="uc1" TagName="Timestamp" Src="Timestamp.ascx" %> You can see there s not much to this control. It will have no visible rendering behavior; you re really just using it to store a value in the ViewState. The timestamp will be tracked by the user control with a public property named TimestampValue. It s implemented thusly in Timestamp.ascx. public object TimestampValue { get { byte[] ba = new byte[8]; for(int indx = 0; indx < 8; indx++) { ba[indx] = Convert.ToByte( txtTimestamp.Text.Substring(indx * 3,2),16); } return ba; }

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procedure do_or_update; procedure do_or_child_update; procedure do_rel_update; procedure do_rel_child_update; procedure do_nt_update; procedure do_nt_child_update; procedure do_or_delete; procedure do_rel_delete; procedure do_nt_delete; procedure do_rel_bulk_insert( p_num_of_parents in int := 50, p_num_of_children in int := 500 ); end; /

ContextUtil.DeactivateOnReturn = true; return ds; } } Notice that in this case, we ve added not only the JustInTimeActivation attribute back on to the class definition, but also added a call to DeactivateOnReturn into the method body, to ensure COM+ knows the instance can be returned to the pool when the method call is complete. Finally, you can use object pooling to throttle access to a limited resource. By minimizing the maximum pool size, you can control the number of concurrent requests that can be processed by the pooled object. For example, you might have a document management system with a ten-connection license. In order to avoid having more than ten concurrent connections, you can pool the object with a maximum pool size of ten, and a peak in load will be serialized after the tenth instance is served from the pool.

The F# type string is an abbreviation for .NET type System.String and represents a sequence of Unicode UTF-16 characters. In the following sections, we briefly introduce strings and the most useful functions for formatting them.