1DBD::Gofer::Transport::UssterreaCmo(n3t)ributed Perl DocDuBmDe:n:tGaotfieorn::Transport::stream(3)
2
3
4
6 DBD::Gofer::Transport::stream - DBD::Gofer transport for stdio
7 streaming
8
10 DBI->connect('dbi:Gofer:transport=stream;url=ssh:username@host.example.com;dsn=dbi:...',...)
11
12 or, enable by setting the DBI_AUTOPROXY environment variable:
13
14 export DBI_AUTOPROXY='dbi:Gofer:transport=stream;url=ssh:username@host.example.com'
15
17 Without the "url=" parameter it launches a subprocess as
18
19 perl -MDBI::Gofer::Transport::stream -e run_stdio_hex
20
21 and feeds requests into it and reads responses from it. But that's not
22 very useful.
23
24 With a "url=ssh:username@host.example.com" parameter it uses ssh to
25 launch the subprocess on a remote system. That's much more useful!
26
27 It gives you secure remote access to DBI databases on any system you
28 can login to. Using ssh also gives you optional compression and many
29 other features (see the ssh manual for how to configure that and many
30 other options via ~/.ssh/config file).
31
32 The actual command invoked is something like:
33
34 ssh -xq ssh:username@host.example.com bash -c $setup $run
35
36 where $run is the command shown above, and $command is
37
38 . .bash_profile 2>/dev/null || . .bash_login 2>/dev/null || . .profile 2>/dev/null; exec "$@"
39
40 which is trying (in a limited and fairly unportable way) to setup the
41 environment (PATH, PERL5LIB etc) as it would be if you had logged in to
42 that system.
43
44 The ""perl"" used in the command will default to the value of $^X when
45 not using ssh. On most systems that's the full path to the perl that's
46 currently executing.
47
49 Currently gofer stream connections persist (remain connected) after all
50 database handles have been disconnected. This makes later connections
51 in the same process very fast.
52
53 Currently up to 5 different gofer stream connections (based on url) can
54 persist. If more than 5 are in the cache when a new connection is made
55 then the cache is cleared before adding the new connection. Simple but
56 effective.
57
59 Document go_perl attribute
60
61 Automatically reconnect (within reason) if there's a transport error.
62
63 Decide on default for persistent connection - on or off? limits? ttl?
64
66 Tim Bunce, <http://www.tim.bunce.name>
67
69 Copyright (c) 2007, Tim Bunce, Ireland. All rights reserved.
70
71 This module is free software; you can redistribute it and/or modify it
72 under the same terms as Perl itself. See perlartistic.
73
75 DBD::Gofer::Transport::Base
76
77 DBD::Gofer
78
79
80
81perl v5.36.0 2023-01-20 DBD::Gofer::Transport::stream(3)