Design and implementation of an online trading market scheme (i)

This paper designs an online commodity trading system. As a part of the virtual community, the system simulates the market behavior of people in real life and provides the purchase and sale service for the community users. Using this system, users can not only publish and query supply and demand information, but also real-time online communication, express the purchase and sale of the intention to engage in purchase and sale activities, so as to achieve online transactions.


System with Windows NT 4.0 as the platform, IIS 4.0 as a Web server, MS SQL Server 7.0 database server, the database has a user table, supply and demand information table and sales Record table, three data tables record related transaction data, development tools using HTML, ASP and JavaScript, part of the program is as follows.


User identity authentication Subsystem
The system uses the member system, all users must register first, can enter the market. The user is managed hierarchically, depending on the user level to determine the length of the user's registered supply and demand information release time. The user name and password are used to control the registration behavior and transaction behavior of the users. This subsystem mainly by the program login.htm, CHECK. ASP completed.

Provide user login interface

LOGIN. Htm
......
< FORM action= "check.asp" method=
"Post" Name= "Form1" target= "_top" >
User:< INPUT name= "username" size= ">< br >
Password:< INPUT name= "USERPD" type=
"Password" size= ">< br >
< INPUT type= "submit" value= "enter" >  
< INPUT type= "reset" value= "rewrite" >
......

Validate user login information and automatically register new users

CHECK. Asp
......
' Handle actions that have been registered with the user
If not rs.eof then
' The password is not correct
If Userpd#trim (RS (1). Value) Then
Response.Write "< title > Login Error Tip </title >< br >"
Response.Write "< center > username" and
"Password" does not match! </center >< br > "
Response.Write "Causes and Treatment methods:< br >
1. If you are the first time to log in, then the user name has been registered by someone else!
You can only change other names to register;< br > "