实例：同一主机下的运行
主机配置：PIII450 128M 15GB
操作系统：Red Hat Linux 6.1
数据库：MySQL-3.22.29
建议使用RPM方式安装，至少要安装下面三个包：
MySQL-3.22.29-1.i386.rpm
MySQL-client-3.22.29-1.i386.rpm
MySQL-devel-3.22.29-1.i386.rpm
WWW服务器：Apache 1.3.6 for Linux
Perl 解释器：version 5.005_03 built for i386-linux
DBI: 版本为：1.13
Data-ShowTable: 版本为：3.3
DBD: Msql-Mysql-modules-1.2018
本人成功地在上述环境下实现了对MySQL数据库的访问。与Windows环境下的数据库不同，它不需要建立外部数据源.
下面是一个应用的简单例子：
为了统计用户访问我们的网站的次数，我们建立了一个数据库, 在其中建一个表，表名为：usedata, 共有三列：userno,userpass,lognum,分别代表用户名,密码,登录次数.
假定我们使用test数据库，在该库中创建表usedata, 我们既可以编一个PERL程序实现，也可以在命令行方式下实现：
#mysql test
>CREATE TABLE usedata(userno CHAR(8) NOT NULL, usepass CHAR(8) NOT NULL, lognum INT);
>exit
共有两个htm文件，两个pl文件.
regist.htm <html>
<head>
<meta http-equiv="Content-Type"
content="text/html; charset=gb_2312-80">
<meta name="GENERATOR" content="Microsoft FrontPage Express 2.0">
<title>注册</title>
</head>
<body>
<p><center><font color=ff3380>用户在线注册</font></center>
</p>
<form action="/cgi-bin/database/regist.pl" method="POST">
<table border="0">
<td valign="top"><font color="#400080">用户名<input type=text name='IDNO' size=4 maxlength=8></font>
<td valign="top"><font color="#400080">密码<input type=password name='PASS' size=6 maxlength=8></font>
</table>
<font color="#0080C0"><input type="submit"
value="注册"> <input type="reset" value="清除"> </font>
</form>
</body>
</html>
login.htm <html>
<head>
<meta http-equiv="Content-Type"
content="text/html; charset=gb_2312-80">
<meta name="GENERATOR" content="Microsoft FrontPage Express 2.0">
<title>登录</title>
</head>
<body>
<p><center><font color=ff3380>用户在线登录</font></center>
</p>
<form action="/cgi-bin/database/login.pl" method="POST">
<table border="0">
<td valign="top"><font color="#400080">用户名<input type=text name='IDNO' size=4 maxlength=8></font>
<td valign="top"><font color="#400080">密码<input type=password name='PASS' size=6 maxlength=8></font>
</table>
<font color="#0080C0"><input type="submit"
value="登录"> <input type="reset" value="清除"> </font>
</form>
</body>
</html>
regist.pl #!/usr/bin/perl
# regist.pl
<p>read(STDIN, $buffer, $ENV{'CONTENT_LENGTH'});
@pairs = split(/&/, $buffer);
foreach $pair (@pairs) {
($name, $value) = split(/=/, $pair);
$value =~ tr/+/ /;
$value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg;
$value =~ s/<!--(.|\n)*-->//g;
$value=~ s/<([^>]|\n)*>//g;
$value=~ s/>/>/g;
$value=~ s/</</g;
$FORM{$name} = $value;
}
<p>print "Content-type: text/html\n\n";
<p>print "<HTML><HEAD><TITLE>注册</TITLE></HEAD>\n";
<p>print "<body bgcolor=#FFFFFF>\n";
<p>
if ($FORM{'IDNO'} eq "")
{
print<<EOF;
<center><font color=red>用户名不能为空!</font>
返回<a href='javascript:history.go(-1);'>前页</a>修改
</center>
EOF
exit(0);
}
<p>if ($FORM{'PASS'} eq "")
{
print<<EOF;
<center><font color=red>密码不能为空!</font>
返回<a href='javascript:history.go(-1);'>前页</a>修改
</center>
EOF
exit(0);
}
<p>$host= shift || "";
$test_db="test";
$opt_user=$opt_password="";
<p>use DBI;
<p>$|= 1; # Autoflush
<p>$table="usedata";
<p>$dbh = DBI->connect("DBI:mysql:$test_db:$host",$opt_user,$opt_password) || die "Can't connect: $DBI::errstr\n";
<p>$n1 = $FORM{'IDNO'};
<p>$sth=$dbh->prepare("select * from usedata where userno=$n1 ") or die $dbh->errstr;
<p>$sth->execute() or die $sth->errstr;
<p>if (($row = $sth->fetchrow_arrayref))
{
$dbh->disconnect();
print<<EOF;
<center><font color=red>用户名已存在!</font>
返回<a href='javascript:history.go(-1);'>前页</a>修改
</center>
EOF
exit(0);
}
$n2 = $FORM{'PASS'};
$n3 = 1;
$dbh->do("insert into $table values($n1, $n2,$n3)") or die $DBI::errstr;
<p>$dbh->disconnect();
print<<EOF;
<center>您已注册成功!</center>
</BODY></HTML>
EOF
exit(0);
<p>login.pl #!/usr/bin/perl
# login.pl
<p>read(STDIN, $buffer, $ENV{'CONTENT_LENGTH'});
@pairs = split(/&/, $buffer);
foreach $pair (@pairs) {
($name, $value) = split(/=/, $pair);
$value =~ tr/+/ /;
$value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg;
$value =~ s/<!--(.|\n)*-->//g;
$value=~ s/<([^>]|\n)*>//g;
$value=~ s/>/>/g;
$value=~ s/</</g;
$FORM{$name} = $value;
}
<p>print "Content-type: text/html\n\n";
<p>print "<HTML><HEAD><TITLE>登录</TITLE></HEAD>\n";
<p>print "<body bgcolor=#FFFFFF>\n";
<p>
if ($FORM{'IDNO'} eq "")
{
print<<EOF;
<center><font color=red>用户名不能为空!</font>
返回<a href='javascript:history.go(-1);'>前页</a>修改
</center>
EOF
exit(0);
}
<p>if ($FORM{'PASS'} eq "")
{
print<<EOF;
<center><font color=red>密码不能为空!</font>
返回<a href='javascript:history.go(-1);'>前页</a>修改
</center>
EOF
exit(0);
}
<p>$host= shift || "";
$test_db="test";
$opt_user=$opt_password="";
use DBI;
$|= 1; # Autoflush
<p>$table="usedata";
<p>$dbh = DBI->connect("DBI:mysql:$test_db:$host",$opt_user,$opt_password) || die "Can't connect: $DBI::errstr\n";
<p>$n1 = $FORM{'IDNO'};
$sth=$dbh->prepare("select * from usedata where userno=$n1 ") or die $dbh->errstr;
<p>$sth->execute() or die $sth->errstr;
if (($row = $sth->fetchrow_arrayref))
{
if ($row->[1] eq $FORM{'PASS'})
{
$NUM = $row->[2]+1;
$sth=$dbh->prepare("UPDATE usedata SET lognum=$NUM where userno=$n1 ") or die $dbh->errstr;
$sth->execute() or die $sth->errstr; print<<EOF;
<center>您第 $NUM 次登录!</center>
EOF
}
else
{
print<<EOF;
<center><font color=red>密码不正确!</font>
返回<a href='javascript:history.go(-1);'>前页</a>修改
</center>
EOF
}
}
else
{
print<<EOF;
<center><font color=red>用户名不正确!</font>
返回<a href='javascript:history.go(-1);'>前页</a>修改
</center>
EOF
}
$dbh->disconnect();
print <<EOF;
</body></html>
EOF
exit(0);
