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DBD::Gofer::Transport::stream(3)     User Contributed Perl Documentation    DBD::Gofer::Transport::stream(3)



NAME
       DBD::Gofer::Transport::stream - DBD::Gofer transport for stdio streaming

SYNOPSIS
         DBI->connect('dbi:Gofer:transport=stream;url=ssh:username@host.example.com;dsn=dbi:...',...)

       or, enable by setting the DBI_AUTOPROXY environment variable:

         export DBI_AUTOPROXY='dbi:Gofer:transport=stream;url=ssh:username@host.example.com'

DESCRIPTION
       Without the "url=" parameter it launches a subprocess as

         perl -MDBI::Gofer::Transport::stream -e run_stdio_hex

       and feeds requests into it and reads responses from it. But that's not very useful.

       With a "url=ssh:username@host.example.com" parameter it uses ssh to launch the subprocess on a remote
       system. That's much more useful!

       It gives you secure remote access to DBI databases on any system you can login to.  Using ssh also
       gives you optional compression and many other features (see the ssh manual for how to configure that
       and many other options via ~/.ssh/config file).

       The actual command invoked is something like:

         ssh -xq ssh:username@host.example.com bash -c $setup $run

       where $run is the command shown above, and $command is

         . .bash_profile 2>/dev/null || . .bash_login 2>/dev/null || . .profile 2>/dev/null; exec "$@"

       which is trying (in a limited and fairly unportable way) to setup the environment (PATH, PERL5LIB
       etc) as it would be if you had logged in to that system.

       The ""perl"" used in the command will default to the value of $^X when not using ssh.  On most
       systems that's the full path to the perl that's currently executing.

PERSISTENCE
       Currently gofer stream connections persist (remain connected) after all database handles have been
       disconnected. This makes later connections in the same process very fast.

       Currently up to 5 different gofer stream connections (based on url) can persist.  If more than 5 are
       in the cache when a new connection is made then the cache is cleared before adding the new
       connection. Simple but effective.

TO DO
       Document go_perl attribute

       Automatically reconnect (within reason) if there's a transport error.

       Decide on default for persistent connection - on or off? limits? ttl?

AUTHOR
       Tim Bunce, <http://www.tim.bunce.name>

LICENCE AND COPYRIGHT
       Copyright (c) 2007, Tim Bunce, Ireland. All rights reserved.

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl
       itself. See perlartistic.

SEE ALSO
       DBD::Gofer::Transport::Base

       DBD::Gofer



perl v5.12.5                                     2010-12-21                 DBD::Gofer::Transport::stream(3)