How to create a voting System!
-----------------------------
For my application I've been writing, i decided to make a voting system, and thought
I'd share with you all now, how to do it :)
for this i am using my application which is about rather attractive women
http://webdev.webleicester.co.uk/test/women/
(not complete yet)
The Database
------------
vote_id = (Autonumber) (primary)
woman_id = (int) (4)
one = (int) (4)
two = (int) (4)
three = (int) (4)
four = (int) (4)
five = (int) (4)
avg_votes = (decimal) (9) (scope=1)
totalvotes = (int) (4)
Quick not about avg_votes,
this column has to be able to accept decimal places the scope=1 is something you have in MS SQL2000
and the 1 means how many decimals it can use
IF the script doesn't appear to be working open up the DB and type in 4.32432 it will then round up to where its been set to
so if it allows no decimal places it'll go to 4 if its scope is set to 2 it'll round to 4.32
But to be sure, always read your documentation
back to the tutorial!
On the main page we have links that look like this
<a href="vote.cfm?id=#id#&vote=1">1</a>
<a href="vote.cfm?id=#id#&vote=2">2</a>
<a href="vote.cfm?id=#id#&vote=3">3</a>
<a href="vote.cfm?id=#id#&vote=4">4</a>
<a href="vote.cfm?id=#id#&vote=5">5</a>
Then on the next page we will add that vote under the column that equals url.vote
and it will just +1 so then you can be more specific other than averages you could show that
50 people voted 5 where as 120 people voted as 1
then we have this for the voting page
Vote.cfm
--------
<html><head><title>Link Updated!</title></head><body>
<!--- Collect information --->
<cfquery name="GetVotes"
Datasource="#application.dsn#">
SELECT *
FROM votes
WHERE woman_id=#url.id#
</cfquery>
<!--- Set the parameters --->
<CFSET total = #GetVotes.totalvotes#>
<CFSET average = #GetVotes.avg_vote#>
<CFSET voteone = #GetVotes.one#>
<CFSET votetwo = #GetVotes.two#>
<CFSET votethree = #GetVotes.three#>
<CFSET votefour = #GetVotes.four#>
<CFSET votefive = #GetVotes.five#>
<!--- update the columns with the votes --->
<cfif url.vote eq 1>
<CFSET voteone = voteone + 1>
<cfquery name="UpdateVote"
Datasource="#application.dsn#">
UPDATE votes
SET one=#voteone#
WHERE woman_id=#url.id#
</cfquery>
</cfif>
<cfif url.vote eq 2>
<CFSET votetwo = votetwo + 1>
<cfquery name="UpdateVote"
Datasource="#application.dsn#">
UPDATE votes
SET two='#votetwo#'
WHERE woman_id=#url.id#
</cfquery>
</cfif>
<cfif url.vote eq 3>
<CFSET votethree = votethree + 1>
<cfquery name="UpdateVote"
Datasource="#application.dsn#">
UPDATE votes
SET three='#votethree#'
WHERE woman_id=#url.id#
</cfquery>
</cfif>
<cfif url.vote eq 4>
<CFSET votefour = votefour + 1>
<cfquery name="UpdateVote"
Datasource="#application.dsn#">
UPDATE votes
SET four=#votefour#
WHERE woman_id=#url.id#
</cfquery>
</cfif>
<cfif url.vote eq 5>
<CFSET votefive = votefive + 1>
<cfquery name="UpdateVote"
Datasource="#application.dsn#">
UPDATE votes
SET five='#votefive#'
WHERE woman_id=#url.id#
</cfquery>
</cfif>
<!--- Update the Total Votes --->
<cfset total = total + 1>
<cfquery name="UpdateVote"
Datasource="#application.dsn#">
UPDATE votes
SET totalvotes=#total#
WHERE woman_id=#url.id#
</cfquery>
<!--- Update the total average
the formula we are using is
1 * votes
+ 2 * votes
+ 3 * votes
+ 4 * votes
+ 5 * votes
/ totalvotes
--->
<cfset step1 = (1 * #voteone#) + (2 * #votetwo#) + (3 * #votethree#) + (4 * #votefour#) + (5 * #votefive#)>
<cfset average = step1 / #total#>
<cfquery name="UpdateVote"
Datasource="#application.dsn#">
UPDATE votes
SET avg_vote=#average#
WHERE woman_id=#url.id#
</cfquery>
<CFOUTPUT>
<html>
<head>
<meta http-equiv=refresh content="0;URL=pageyoujustcamefrom.cfm">
</head>
<center>
<table width=700>
<tr>
<td bgcolor=##000000>
<font color=##AAAA77 face=verdana,arial size=2>
If your browser does not support javascript page redirection, click <a href="pageyoujustcamefrom.cfm">here</a>.
</font>
</td>
</tr>
</table>
</center>
</html>
</CFOUTPUT>
Then after that you can say
<cfquery name="GetWomen" datasource="#application.dsn#">
SELECT *
FROM women, votes
where (women.id = votes.Woman_id)
AND id = #url.id#
</cfquery>
<cfoutput name="GetWomen">
Average Rating #avg_vote# over #totalvotes# votes!
</cfoutput>
hope this helps you all!!
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