DBM Databases
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<!bccstudents1.html><html><head><title>BCC Students</title></head><BODY><h1>BCC Student eMail List</h1><form action="http://www.pgrocer.com/cgi-bin/db/bccstudents1.cgi" method=post>The CIS Department is publishing a newsletter to keep students up-to-date with changes thatare being made. This page will give you the opportunity to sign up for the newsletter or remove your name from the newsletter list.<br><br>Student Name: <input type=text name=stuname size=25><br>Student Major:<input type=text name=major size=3><br>Student Option:<input type=text name=option size=3><br>eMail address: <input type=text name=email size=50><br><br><input type=submit name=button value="Add me to the CIS Mailing List"><input type=submit name=button value="Remove me from the CIS Mailing List"><br><br><input type=submit name=button value="View my information"><input type=reset value="Reset"></form></body></html>
#!/usr/bin/perl#bccstudents1.cgi - add and remove names from CIS mailing listprint "Content-type: text/html\n\n";use CGI::Carp qw(fatalsToBrowser);use CGI qw(:standard);use SDBM_File;use Fcntl;use strict;#declare variablesmy ($button, $name, $major, $option, $email);#assign values to variables$button = param('button');$name = param('stuname');$major = param('major');$option = param('option');$email = param('email');if ($button eq "Add me to the CIS Mailing List") {
add();}elsif ($button eq "Remove me from the CIS Mailing List") {
remove();}elsif ($button eq "View my information") { view()}exit;
#*****user-defined functions*****
The functions add(), remove() and view() are shown on the next few pages.
sub view { #declare variable my %mail;
#open database, view record, close database tie(%mail, "SDBM_File", "cislist", O_RDONLY, 0666)
or die "Error opening cislist. $!, stopped"; ($name, $major, $option) = split(/,/, $mail{$email});
if (exists($mail{$email})) { untie(%mail); #create Web page print "<html>\n"; print "<head><title>CIS Newsletter Mailing List</title><basefont size=5></head>\n"; print "<h1>CIS Newsletter Mailing List</h1>\n"; print "<form action='http://www.pgrocer.com/cgi-bin/db/bccstudents1a.cgi' method=post>\n"; print "Student Name: <input type=text name=stuname value='$name' size=25><br>\n"; print "Student Major: <input type=text name=major value='$major' size=3><br>\n"; print "Student Option: <input type=text name=option value='$option' size=3><br>\n"; print "eMail address: <input type=text name=email value=$email size=50><br><br>\n"; print "<input type=submit name=button value='Update Mailing List'><br><br>\n"; print "<a href='http://www.pgrocer.com/db/bccstudents1.html'>OR...Click here to return to main page</a>\n"; print "</body></html>\n"; } else { untie(%mail); #create Web page print "<html>\n"; print "<head><title>CIS Newsletter Mailing List</title><basefont size=5></head>\n"; print "<h1>CIS Newsletter Mailing List</h1>\n"; print "Record does not exist.<br><br>\n"; print "<a href='http://www.pgrocer.com/db/bccstudents1.html'>Click here to return to main page</a>\n"; print "</body></html>\n"; }} #endview
This is the code that opens the database. Note that I am opening in as readonly. I then take the record that the key located and split it into the appropriate fields so I can display them on the screen.
sub add { #declare variable
my %mail;
#open database, add record, close database tie(%mail, "SDBM_File", "cislist", O_CREAT|O_RDWR, 0666)
or die "Error opening cislist. $!, stopped"; $mail{$email} = "$name,$major,$option"; untie(%mail); #create Web page print "<html>\n"; print "<head><title>CIS Newsletter Mailing List</title><basefont size=5></head>\n"; print "<h1>CIS Newsletter Mailing List</h1>\n"; print "You are on our list to receive your newsletter at $email.<br><br>\n"; print "<a href='http://www.pgrocer.com/db/bccstudents1.html'>Click here to return to main page</a>\n"; print "</body></html>\n";
} #end add
sub remove { #declare variables my (%mail, $msg); #open database tie(%mail, "SDBM_File", "cislist", O_RDWR, 0)
or die "Error opening cislist. $!, stopped";
#determine if user's information is in the database if (exists($mail{$email})) {
delete($mail{$email});$msg = "Mail will not be sent to $email";
} else {
$msg = "Our mailing list does not include $email.";}
#close database untie(%mail);
#create Web page print "<html>\n"; print "<head><title>CIS Newsletter Mailing List</title><basefont size=5></head>\n"; print "<h1>CIS Newsletter Mailing List</h1>\n"; print "$msg<br><br>\n"; print "<a href='http://www.pgrocer.com/db/bccstudents1.html'>Click here to return to main page</a>\n"; print "</body></html>\n";} #end remove
#!/usr/bin/perl#bccstudents1a.cgi - change names from CIS mailing listprint "Content-type: text/html\n\n";use CGI::Carp qw(fatalsToBrowser);use CGI qw(:standard);use SDBM_File;use Fcntl;use strict;#declare variablesmy ($button, $name, $major, $option, $email);#assign values to variables$button = param('button');$name = param('stuname');$major = param('major');$option = param('option');$email = param('email');if ($button eq "Update Mailing List") {
change();}exit;#*****user-defined functions*****
sub change { #declare variable
my %mail;
#open database, add record, close database tie(%mail, "SDBM_File", "cislist", O_CREAT|O_RDWR, 0666)
or die "Error opening cislist. $!, stopped"; $mail{$email} = "$name,$major,$option"; untie(%mail);
#create Web page print "<html>\n"; print "<head><title>CIS Newsletter Mailing List</title><basefont size=5></head>\n"; print "<h1>CIS Newsletter Mailing List</h1>\n"; print "The information has been changed.<br>\n"; print "Name: $name<br>\n"; print "Major: $major<br>\n"; print "Option: $option<br>\n"; print "eMail: $email<br><br><br>\n"; print "<a href='http://www.pgrocer.com/db/bccstudents1.html'>Click here to return to main page</a>\n"; print "</body></html>\n";} #end change
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