Perl类、CGI和DBI编程
方法是一种属于类的特殊子例程，要求第一个参数必须是包含或指向对象的引用，并且这个参数是由perl自动隐式赋值的。
House.pm
package House;
sub new{
my $class=shift;
my $ref={};
bless($ref,$class);
return $ref;
}
sub set_data{
my $self=shift;
my $key=shift;
my $value=shift;
$self->{$key}=$value;
}
sub get_data{
my $self=shift;
my $key=shift;
$self->{$key};
}
1;
同目录下建立Perl文件useHouse
#!/usr/bin/perl
use 5.010; ##say相当于print外加换行符，但必须申明使用Perl5.1的新特征
require ("House.pm"); ##引入外部文件
my $house=new House("Bieshu");
say ref($house); ##ref函数返回类名--House
$house->set_data("name","balihaoting");
say $house->get_data("name");
在Apache服务目录下有个htdocs，用来存放html文件，form.html
<html>
<head><title>CGI Form</title></head>
<bod>
<form action="cgi-bin/form" method=get>
Name:<br>
<input type="text" size=25 name="name"><br>
Phone:<br>
<input type="text" size=25 name="phone"><br>
<input type=submit value="Submit">
<input type=reset value="Clear">
</form>
</body>
</html>
cgi-bin目录下用来存放脚本文件，form
#!/usr/bin/perl
print "Content-type:text/html\n\n";
@key_value=split(/&/,$ENV{QUERY_STRING});
foreach $pair (@key_value){
$pair=~tr/+/ /;
($key,$value)=split(/=/,$pair);
print "\t$key:$value<br>";
}
下面给一个在同一个perl程序中显示页面和处理响应的例子：
#!/usr/bin/perl
use CGI qw(:standard);
print header("text/html;charset=gb2312");
print start_html(-title=>'Function-Oriented Syntax',-bgcolor=>'silver');
print
h1("Let's hear from you!"),
h2("I'm intersted."),
start_form,
"what's your name?",textfield('Name'),
p,
"what's you occupation?",textfield('Job'),
p,
"select a vacation spot.",popup_menu(
-name=>'Place',
-value=>['Hawaii','Europe','Mexico','Japan'],
),
p,
"Do you want a green balloon?",
br,
checkbox(-name=>"Choice",-label=>'If yes,check this box'),
p,
submit("Submit"),
end_form;
print hr;
if(param()){
print "Your name is ",em(param('Name')),
p,
"Your occupation is ",em(param('Job')),
p,
"Your vacation spot is ",em(param('Place')),
p;
if(param('Choice') eq "on"){
print "You will receive a green balloon shortly!";
}
print hr;
}
print end_html;
DBI编程示例：
#!/usr/bin/perl
use DBI qw/:sql_types/;
my $dbh=DBI->connect('dbi:mysql:mysql','root','passwd',
{
PrintError=>0,
RaiseError=>1,
AutoCommit=>0,
}
)or die "Connect failed:$DGI::errstr";
my @rows=(
['zcy',3,4],
['orisun',34,5],
['zsir',4,1]
);
my $sql=qq{INSERT INTO tb_sample VALUES(?,?,?)};
my $sth=$dbh->prepare($sql);
foreach $param (@rows){
eval{$sth->bind_param(1,$param->[0],SQL_VARCHAR);
$sth->bind_param(2,$param->[1],SQL_INTEGER);
$sth->bind_param(3,$param->[2],SQL_INTEGER);
$sth->execute() or die "Insert data failed:$DBI::errstr.";
};
}
if($@){ ##如果eval执行失败，则$@为true
warn "database error:$DBI::errstr\n";
$dbh->rollback();
}
else{
$dbh->commit();
my $name='zcy';
$name=$dbh->quote($name); ##处理引号
$sth=$dbh->prepare("select * from tb_sample where name=$name");
$sth->execute();
# $sth->dump_results(); ##直接全部输出查询结果
while(my $row=$sth->fetchrow_hashref()){
print "Name=$row->{name}\t";
print "Height=$row->{height}\t";
print "Weight=$row->{weight}\n";
}
}
$sth->finish();
$dbh->disconnect();
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