
DBD::Pg  --  the DBI PostgreSQL interface for Perl

# $Id: README,v 1.19 2003/07/21 21:45:12 turnstep Exp $

DESCRIPTION:
------------

This is version 1.30 of DBD-Pg.  The web site for this interface is at:

	http://gborg.postgresql.org/project/dbdpg/projdisplay.php

For further information about DBI look at:

	http://dbi.perl.org/

For information about PostgreSQL, visit:

	http://www.postgresql.org/

COPYRIGHT:
----------

	Portions Copyright (c) 1994,1995,1996,1997 Tim Bunce
	Copyright (c) 1997,1998,1999,2000 Edmund Mergl
	Copyright (c) 2002 Jeffrey W. Baker
	Copyright (c) 2002,2003 PostgreSQL Global Development Group

You may distribute under the terms of either the GNU General Public
License or the Artistic License, as specified in the Perl README file.


HOW TO GET THE LATEST VERSION:
------------------------------

Use the following URL to look for new versions of this module: 

	http://gborg.postgresql.org/project/dbdpg/projdisplay.php

or

	http://www.perl.com/CPAN/modules/by-module/DBD/

Note that this request will be redirected automatically to the 
nearest CPAN site.


IF YOU HAVE PROBLEMS:
---------------------

Please send comments and bug-reports to <dbd-general@gborg.postgresql.org>

Please include the output of perl -v and perl -V, the version of PostgreSQL,
the version of DBD-Pg, the version of DBI, and details about your platform
in your bug-report.


REQUIREMENTS:
-------------

	build, test, and install Perl 5         (at least 5.6.1)
	build, test, and install the DBI module (at least 1.35)
	build, test, and install PostgreSQL     (at least 7.2)
	build, test, and install Test::Simple   (at least 0.30)

INSTALLATION:
-------------

By default Makefile.PL uses App:Info to find the location of the
PostgreSQL library and include directories.  However, if you want to
control it yourself, define the environment variables POSTGRES_INCLUDE 
and POSTGRES_LIB, or POSTGRES_HOME. Note that if you've compiled
PostgreSQL with SSL support, you must define the POSTGRES_LIB
environment varable and add "-lssl" to it, like this:

	export POSTGRES_LIB="/usr/local/pgsql/lib -lssl"

Now, take the usual steps to install DBD::Pg:

	1.   perl Makefile.PL
	2.   make
	3.   make test
	4.   make install

Do steps 1 to 3 as normal user, not as root!


TESTING:
--------

The tests are designed to connect to a live database.  The following
environment variables must be set for the tests to run:

	DBI_DSN=dbi:Pg:dbname=<database>
	DBI_USER=<username>
	DBI_PASS=<password>

If you are running on a non-standard port, you must add it 
to the DBI_DSN variable like this:

	DBI_DSN='dbi:Pg:dbname=<database>;port=<port#>'

Put double quotes around the dbname if it has a semicolon in it:

	DBI_DSN='dbi:Pg:dbname="<data;base>"'

If you are using the shared library libpq.so check if your dynamic
loader finds libpq.so. With Linux the command /sbin/ldconfig -v should
tell you where it finds libpq.so. If ldconfig does not find libpq.so,
either add an appropriate entry to /etc/ld.so.conf and re-run ldconfig
or add the path to the environment variable LD_LIBRARY_PATH.

A typical error message resulting from not finding libpq.so is: 

	install_driver(Pg) failed: Can't load './blib/arch/auto/DBD/Pg/Pg.so' 
	for module DBD::Pg: File not found at

If you get an error message like:

	perl: error while loading shared libraries:
	/usr/lib/perl5/site_perl/5.6.1/i386-linux/auto/DBD/Pg/Pg.so: undefined
	symbol: PQconnectdb

when you call DBI->connect, then your libpq.so was probably not seen at
build-time.  This should have caused 'make test' to fail; did you really
run it and look at the output? Check the setting of POSTGRES_LIB and
recompile DBD-Pg.
 
Some linux distributions have incomplete perl installations.  If you have
compile errors like "XS_VERSION_BOOTCHECK undeclared", do:

	find .../lib/perl5 -name XSUB.h -print

If this file is not present, you need to recompile and re-install perl.


SGI users: if you get segmentation faults make sure, you use the malloc
which comes with perl when compiling perl (the default is not to).
"David R. Noble" <drnoble@engsci.sandia.gov>


HP users: if you get error messages like:

	can't open shared library: .../lib/libpq.sl
	No such file or directory

when running the test script, try to replace the 'shared' option in the
LDDFLAGS with 'archive'.  Dan Lauterbach <danla@dimensional.com>


FreeBSD users: if you get during make test the error message:

	'DBD driver has not implemented the AutoCommit attribute'

recompile the DBI module and the DBD-Pg module and disable optimization.
This error message is due to the broken optimization in gcc-2.7.2.1.

If you get compiler errors like:
	In function `XS_DBD__Pg__dr_discon_all_'
	`sv_yes' undeclared (first use in this function)

It may be because there is a 'patchlevel.h' file from another package 
(such as 'hdf') in your POSTGRES_INCLUDE dir.  The presence of this file 
prevents the compiler from finding the perl include file 
'mach/CORE/patchlevel.h'.  Do 'pg_config --includedir' to identify the 
POSTGRES_INCLUDE dir.  Rename patchlevel.h whilst you build DBD::Pg. 


Sun Users: if you get compile errors like:

	/usr/include/string.h:57: parse error before `]'

then you need to remove from pgsql/include/libpq-fe.h the define for
strerror, which clashes with the definition in the standard include
file.


Win32 Users: Running DBD-Pg scripts on Win32 needs some configuration work
on the server side:

	o add a postgres user with the same name as the NT-User 
	  (eg Administrator)
	o make sure, that your pg_hba.conf on the server is configured,
	  such that a connection from another host will be accepted
