All the scripting languages like python, php, ruby, and perl are mature
and good to build robust, dynamic website. Perl is a good choice for
anyone wanting to build a fast, scalable internet or Intranet
application that is accessed via a web browser. The perl application
when written cleanly will run under both perl or mod_perl.
An application running under mod_perl will run 200 to 2,000 times faster
than under regular perl. Mod_perl has been closely coupled to the
Apache Web Server, which enjoys over 60% of the web server space.
Mod_perl is an executable that runs persistently within Apache,
something like FoxPro's runtime. When a perl module is called by
Apache, it is compiles into binary and cached into memory. By
specifying Apache::DBI be used in the perl script, Apache will create a
persistent connection to a PostgreSQL, MySQL, other databases.
All this adds up to web pages that display in a blink and scale even on
modest hardware. It is no longer necessary to compile special versions
of the related apps. All I had to do in Fedora 13 was select mod_perl
from the Add/Remove software menu, and mod_perl installed and was ready
to go. Its really simple now.
Mod_perl gives the programmer full access to Apache's APIs, and perl
code can even be place in the Apache httpd.conf file.
Here is an example where I create paths in httpd.conf file.
#------------------------ ssl.conf -------------------------------
PerlOptions +SetupEnv
PerlModule ModPerl::Registry
<Location /sm_demo/>
SetHandler perl-script
PerlResponseHandler ModPerl::Registry
PerlOptions +ParseHeaders
PerlSetEnv MYLIB /var/www/karts/sm_demo/Sm
PerlSetEnv MY_CONFIG_FILE /var/www/karts/sm_demo/conf/kart_config
Options +ExecCGI
Order allow,deny
Allow from none
PerlSendHeader On
</Location>
#------------------ end ssl.conf -------------------------------
Here are example of using the variables in my perl code:
The following code looks to see if the MYLIB Apache environment variable
is defined. If it is, the fully qualified path to my perl classes is
added to perl's @INC paths. If not, (eg the program is running under
normal perl), the relative path "SM" is added to perl's @inc paths.
use lib $ENV{MYLIB} || 'Sm';
The following code check to see if we have the Apache environment
variable $ENV{MY_CONFIG_FILE}. If true the file handle SMCONFIG is
created using the Apache MY_CONFIG_FILE variable, which holds the fully
qualified path to the app's configuration file. If false, (eg running
under normal perl), the relative path is used.
if ( $ENV{ MY_CONFIG_FILE })
{
open SMCONFIG, "$ENV{ MY_CONFIG_FILE }" or die;
}
else
{
open SMCONFIG, "conf/kart_config" or die
}
http://perl.apache.org/
Regards,
LelandJ
On 03/17/2011 01:14 AM, william tormey wrote:
> Hi All: I am in Bronxville NY for 3 weeks starting April 13th. Having
> just peeked through the mist and sighted land beyond my port project (C
> and Clipper to VFP), I have begun to think of what language I should
> learn considering I must start all over again, a for Internet and b for
> off line applications relating to Dedicated Business Systems and
> Process Control.
>
> If there is any gathering related to VPF and or the above query in the
> greater New York area during my stay I should love to know of it.
>
> TIA
> William Tormey,
> American Microcomputers
> Ireland
>
>
[excessive quoting removed by server]
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