=head1 NAME

INSTALL - How to install and configure DBD::mysql


=head1 SYNOPSIS

  perl Makefile.PL [options]
  make
  make test
  make install


=head1 DESCRIPTION

This document describes the installation and configuration of
DBD::mysql, the Perl DBI driver for the MySQL database. Before
reading on, make sure that you have the prerequisites available:
Perl, MySQL and DBI. For details see the separate section.
L</PREREQUISITES>.

Depending on your version of Perl, it might be possible to
use a binary distribution of DBD::mysql. If possible, this is
recommended. Otherwise you need to install from the sources.
If so, you will definitely need a C compiler. Installation
from binaries and sources are both described in separate
sections. L<BINARY INSTALLATION>. L<SOURCE INSTALLATION>.

Finally, if you encounter any problems, do not forget to
read the section on known problems. L<KNOWN PROBLEMS>. If
that doesn't help, you should look into the archive of the
mailing list B<msql-mysql-modules@lists.mysql.com>. See
http://www.mysql.com for archive locations. And if that
still doesn't help, please post a question on this mailing
list.


=head1 PREREQUISITES

=over

=item Perl

Preferrably a version of Perl, that comes preconfigured with
your system. For example, all Linux and FreeBSD distributions
come with Perl. For Windows, ActivePerl is recommended, see
http://www.activestate.com for details.

=item MySQL

You need not install the actual MySQL database server, the
client files and the devlopment files are sufficient. For
example, the Red Hat Linux distribution comes with RPM files
B<mysql-client> and B<mysql-devel>. These are sufficient,
if the MySQL server is located on a foreign machine. You may
also create client files by compiling from the MySQL source
distribution and using

  configure --without-server

If you are using Windows and need to compile from sources
(which is only the case if you are not using ActivePerl),
then you must ensure that the header and library files are
installed. This may require choosing a "Custom installation"
and selecting the appropriate option when running the
MySQL setup program.

=item DBI

DBD::mysql is a DBI driver, hence you need DBI. It is available
from the same source where you got the DBD::mysql distribution
from.

=item C compiler

A C compiler is only required, if you install from source. In
most cases there are binary distributions of DBD::mysql
available. However, if you need a C compiler, make sure, that
it is the same C compiler that was used for compiling Perl and
MySQL! Otherwise you will almost definitely encounter problems
because of differences in the underlying C runtime libraries.

In the worst case, this might mean to compile Perl and MySQL
yourself. But believe me, experience shows that a lot of problems
are fixed this way.

=item Gzip libraries

Late versions of MySQL come with support for compression. Thus
it B<may> be required that you have install an RPM package like
libz-devel, libgz-devel or something similar.

=back


=head1 BINARY INSTALLATION

Binary installation is possible in the most cases, depending
on your system. I give some examples:


=head2 Windows

ActivePerl offers a PPM archive of DBD::mysql. All you need to
do is typing

  ppm
  install DBI
  install DBD-mysql

This will fetch the modules via HTTP and install them. If you
need to use a WWW proxy server, the environment variable
HTTP_proxy must be set:

  set HTTP_proxy=http://my.proxy.server:8000/
  ppm
  install DBI
  install DBD-mysql

Of course you need to replace the host name C<my.proxy.server>
and the port number C<8000> with your local values.

If the above procedure doesn't work, please upgrade to the latest
version of ActivePerl. Versions before build 623 are known to
have problems.

PPM 3 is said to miss DBD::mysql in the repository. Thus use of
PPM 3 is discouraged, in favour of PPM 2. If you need to use
PPM 3, try

  ppm
  rep add PPM2 http://ppm.activestate.com/PPMPackages/5.6plus/
  rep 2
  install DBI
  install DBD-mysql



=head2 Red Hat Linux

As of version 7.1, Red Hat Linux comes with MySQL and DBD::mysql.
You need to ensure that the following RPM's are installed:

  mysql
  perl-DBI
  perl-DBD-MySQL

For installation from source the following RPM's are required

  mysql-devel
  libz-devel

Optional are

  mysql-server


=head2 Other systems

In the case of Linux or FreeBSD distributions it is very likely
that all you need comes with your distribution, as in the case
of Red Hat Linux. I just cannot give you names, as I am not using
these systems.

Please let me know if you find the files in your SuSE Linux, Debian
Linux or FreeBSD distribution so that I can extend the above list.


=head1 SOURCE INSTALLATION

So you need to install from sources. If you are lucky, the Perl
module C<CPAN> will do all for you, thanks to the excellent work
of Andreas Koenig. Otherwise you will need to do a manual
installation. Some of you, in particular system administrators
of multiple sites, will choose automatic installation. All of
these installation types have an own section. L</CPAN installation>.
L</Manual installation>. L</Configuration>.


=head2 CPAN installation

Installation of DBD::mysql can be incredibly easy:

  cpan
  install DBD::mysql

If you are using the CPAN module for the first time, just answer
the questions by accepting the defaults which are fine in most
cases. If you are using an older version of Perl, you might
instead need a

  perl -MCPAN -e shell
  install DBD::mysql

If you cannot get the CPAN module working, you might try manual
installation. If installation with CPAN fails because the your
local settings have been guessed wrong, you might try to
create a script called C<mysql_config>. This is described in
more details later. L</Configuration>.


=head2 Manual installation

For a manual installation you need to fetch the DBD::mysql
source distribution. The latest version is always available
from

  http://www.cpan.org/modules/by-module/DBD/

The name is typically something like

  DBD-mysql-1.2216.tar.gz

The archive needs to be extracted. On Windows you may use a tool
like WinZip, on Unix you type

  gzip -cd DBD-mysql-1.2216.tar.gz | tar xf -

This will create a subdirectory DBD-mysql-1.2216. Enter this
subdirectory and type

  perl Makefile.PL
  make
  make test

(On Windows you may need to replace "make" with "nmake" or
"dmake".) If the tests seem to look fine, you may continue with

  make install

If the tests fail, you might need to configure some settings.
For example you might choose a different database, the C
compiler or the linker might need some flags. L</Configuration>.
L</C Compiler flags>. L</Linker flags>.

For Windows/CygWin there is a special section below.
L<Windows/CygWin>.
 

=head2 Configuration

The install script "Makefile.PL" can be configured via a lot of
switches. All switches can be used on the command line. For
example, the test database:

  perl Makefile.PL --testdb=<db>

If you do not like configuring these switches on the command
line, you may alternatively create a script called C<mysql_config>.
This is described later on.

Available switches are:

=over

=item testdb

Name of the test database, defaults to B<test>.

=item testuser

Name of the test user, defaults to empty. If the name is empty,
then the currently logged in users name will be used.

=item testpassword

Password of the test user, defaults to empty.

=item testhost

Host name or IP number of the test database; defaults to localhost.

=item testport

Port number of the test database

=item cflags

This is a list of flags that you want to give to the C compiler.
The most important flag is the location of the MySQL header files.
For example, on Red Hat Linux the header files are in /usr/include/mysql
and you might try

  -I/usr/include/mysql

On Windows the header files may be in C:\mysql\include and you might try

  -IC:\mysql\include

The default flags are determined by running

  mysql_config --cflags

More details on the C compiler flags can be found in the following
section. L</C Compiler flags>.

=item libs

This is a list of flags that you want to give to the linker
or loader. The most important flags are the locations and names
of additional libraries. For example, on Red Hat Linux your
MySQL client libraries are in /usr/lib/mysql and you might try

  -L/usr/lib/mysql -lmysqlclient -lz

On Windows the libraries may be in C:\mysql\lib and

  -LC:\mysql\lib -lmysqlclient

might be a good choice. The default flags are determined by running

  mysql_config --libs

More details on the linker flags can be found in a separate section.
L<Linker flags>.

=back

If a switch is not present on the command line, then the
script C<mysql_config> will be executed. This script comes
as part of the MySQL distribution. For example, to determine
the C compiler flags, we are executing

  mysql_config --cflags
  mysql_config --libs

If you want to configure your own settings for database name,
database user and so on, then you have to create a script with
the same name, that replies

  
=head2 C Compiler flags

It is typically not so difficult to determine the appropriate
flags for the C compiler. The linker flags, which you find in
the next section, are another story.

The determination of the C compiler flags is usually left to
a configuration script called F<mysql_config>, which can be
invoked with

  mysql_config --cflags

When doing so, it will emit a line with suggested C compiler
flags, for example like this:

  -L/usr/include/mysql

The C compiler must find some header files. Header files have
the extension C<.h>. MySQL header files are, for example,
F<mysql.h> and F<mysql_version.h>. In most cases the header
files are not installed by default. For example, on Windows
it is an installation option of the MySQL setup program
(Custom installation), whether the header files are installed
or not. On Red Hat Linux, you need to install an RPM archive
F<mysql-devel> or F<MySQL-devel>.

If you know the location of the header files, then you will
need to add an option

  -L<header directory>

to the C compiler flags, for example C<-L/usr/include/mysql>.


=head2 Linker flags

Appropriate linker flags are the most common source of problems
while installing DBD::mysql. I will only give a rough overview,
you'll find more details in the troubleshooting section.
L<KNOWN PROBLEMS>

The determination of the C compiler flags is usually left to
a configuration script called F<mysql_config>, which can be
invoked with

  mysql_config --libs

When doing so, it will emit a line with suggested C compiler
flags, for example like this:

   -L'/usr/lib/mysql' -lmysqlclient -lnsl -lm   -lz -lcrypt

The following items typically need to be configured for the
linker:

=over

=item The mysqlclient library

The MySQL client library comes as part of the MySQL distribution.
Depending on your system it may be a file called

  F<libmysqlclient.a>   statically linked library, Unix
  F<libmysqlclient.so>  dynamically linked library, Unix
  F<mysqlclient.lib>    statically linked library, Windows
  F<mysqlclient.dll>    dynamically linked library, Windows

or something similar.

As in the case of the header files, the client library is typically
not installed by default. On Windows you will need to select them
while running the MySQL setup program (Custom installation). On
Red Hat Linux an RPM archive F<mysql-devel> or F<MySQL-devel> must
be installed.

The linker needs to know the location and name of the mysqlclient
library. This can be done by adding the flags

  -L<lib directory> -lmysqlclient

or by adding the complete path name. Examples:

  -L/usr/lib/mysql -lmysqlclient
  -LC:\mysql\lib -lmysqlclient

  /usr/lib/mysql/libmysqlclient.a
  C:\mysql\lib\mysqlclient.lib

The latter examples are using a statically linked library. This
may be required in some cases, if the dynamically linked library
is not found at run time.

=item The gzip library

The MySQL client can use compression when talking to the MySQL
server, a nice feature when sending or receiving large texts over
a slow network.

On Unix you typically find the appropriate file name by running

  ldconfig -p | grep libz
  ldconfig -p | grep libgz

Once you know the name (libz.a or libgz.a is best), just add it
to the list of linker flags. If this seems to be causing problem
you may also try to link without gzip libraries.

=back


=head1 SPECIAL SYSTEMS

Below you find information on particular systems:


=head2 Windows/CygWin

If you are a user of Cygwin (the Redhat distribution) you already
know, it contains a nicely running perl 5.6.1, installation of
additional modules usually works as a charme via the standard
procedure of

    perl makefile.PL
    make
    make test
    make install

The Windows binary distribution of MySQL runs smoothly under Cygwin.
You can start/stop the server and use all Windows clients without problem.
But to install DBD::mysql you have to take a little special action.

Don't attempt to build DBD::mysql against either the MySQL Windows or
Linux/Unix BINARY distributions: neither will work!

You MUST compile the MySQL clients yourself under Cygwin, to get a
'libmysqlclient.a' compiled under Cygwin. Really! You'll only need
that library and the header files, you don't need any other client parts.
Continue to use the Windows binaries. And don't attempt (currently) to
build the MySQL Server part, it is unneccessary, as MySQL AB does an
excellent job to deliver optimized binaries for the mainstream
operating systems, and it is told, that the server compiled under Cygwin is
unstable.

Install MySQL (if you havn't already)

=over

=item -

download the MySQL Windows Binaries from
http://www.mysql.com/downloads/index.html

=item -

unzip mysql-<version>-win.zip into some temporary location

=item -

start the setup.exe there and follow the instructions

=item -

start the server

=item -

alternatively download, install and start the server on a remote
server, on what supported OS ever

=back


Build MySQL clients under Cygwin:

=over

=item -

download the MySQL LINUX source from
http://www.mysql.com/downloads/index.html

=item -

unpack mysql-<version>.tar.gz into some tmp location

=item -

cd into the unpacked dir mysql-<version>

  ./configure --prefix=/usr/local/mysql --without-server

This prepares the Makefile with the installed Cygwin features. It
takes some time, but should finish without error. The 'prefix', as
given, installs the whole Cygwin/MySQL thingy into a location not
normally in your PATH, so that you continue to use already installed
Windows binaries. The --without-server parameter tells configure to
only build the clients.

=item -

  make

This builds all MySQL client parts ... be patient. It should finish
finally without any error.

=item -

  make install

This installs the compiled client files under /usr/local/mysql/.
Remember, you don't need anything except the library under
/usr/local/mysql/lib and the headers under /usr/local/mysql/include!

Essentially you are now done with this part. If you want, you may try
your compiled binaries shortly; for that, do:

=item -

  cd /usr/local/mysql/bin
  ./mysql -h 127.0.0.1

The host (-h) parameter 127.0.0.1 targets the local host, but forces
the mysql client to use a TCP/IP connection. The default would be a
pipe/socket connection (even if you say '-h localhost') and this
doesn't work between Cygwin and Windows (as far as I know).

If you have your MySQL server running on some other box, then please
substitute '127.0.0.1' with the name or IP-number of that box.

=back

Please note, in my environment the 'mysql' client did not accept a
simple RETURN, I had to use CTRL-RETURN to send commands
... strange,
but I didn't attempt to fix that, as we are only interested in the
built lib and headers.

At the 'mysql>' prompt do a quick check:

  mysql> use mysql
  mysql> show tables;
  mysql> select * from db;
  mysql> exit

You are now ready to build DBD::mysql!


Build DBD::mysql:

=over

=item -

download DBD-mysql-<version>.tar.gz from CPAN

=item -

unpack DBD-mysql-<version>.tar.gz

=item -

cd into unpacked dir DBD-mysql-<version>
you probably did that already, if you are reading this!

=item -

  cp /usr/local/mysql/bin/mysql_config .

This copies the executable script mentioned in the DBD::mysql docs
from your just built Cywin/MySQL client directory; it knows about
your Cygwin installation, especially about the right libraries to link
with.

=item -

  perl Makefile.PL --testhost=127.0.0.1

The --testhost=127.0.0.1 parameter again forces a TCP/IP connection
to the MySQL server on the local host instead of a pipe/socket
connection for the 'make test' phase.

=item -

  make

This should run without error

=item -

  make test

with DBD-mysql-2.1022 or earlier you will see several errors in
dbdadmin.t, mysql.t and mysql2.t; with later versions you should not
get errors (except possibly one, indicating, that some tables could
not be dropped. I'm hunting for a solution to that problem, but have
none yet).

=item -

  make install

This installs DBD::mysql into the Perl hierarchy.

=back

Notes:

This was tested with MySQL version 3.23.54a and DBD::mysql version
2.1022. I patched the above mentioned test scripts and sent the
patches
to the author of DBD::mysql Jochen Wiedman.

Georg Rehfeld          15. Jan. 2003


=head1 KNOWN PROBLEMS

=over

=item 1.)

Some Linux distributions don't come with a gzip library by default.
Running "make" terminates with an error message like

  LD_RUN_PATH="/usr/lib/mysql:/lib:/usr/lib" gcc
    -o blib/arch/auto/DBD/mysql/mysql.so  -shared
    -L/usr/local/lib dbdimp.o mysql.o -L/usr/lib/mysql
    -lmysqlclient -lm -L/usr/lib/gcc-lib/i386-redhat-linux/2.96
    -lgcc -lz 
  /usr/bin/ld: cannot find -lz
  collect2: ld returned 1 exit status
  make: *** [blib/arch/auto/DBD/mysql/mysql.so] Error 1

If this is the case for you, install an RPM archive like
libz-devel, libgz-devel, zlib-devel or gzlib-devel or something
similar.

=item 2.)

If Perl was compiled with gcc or egcs, but MySQL was compiled
with another compiler or on another system, an error message like
this is very likely when running "Make test":

  t/00base............install_driver(mysql) failed: Can't load
  '../blib/arch/auto/DBD/mysql/mysql.so' for module DBD::mysql:
  ../blib/arch/auto/DBD/mysql/mysql.so: undefined symbol: _umoddi3
  at /usr/local/perl-5.005/lib/5.005/i586-linux-thread/DynaLoader.pm
  line 168.

This means, that your linker doesn't include libgcc.a. You have
the following options:

The solution is telling the linker to use libgcc. Run

  gcc --print-libgcc-file

to determine the exact location of libgcc.a or for older versions
of gcc

  gcc -v

to determine the directory. If you know the directory, add a

  -L<directory> -lgcc

to the list of C compiler flags. L</Configuration>. L</Linker flags>.

=item 3.)

There are known problems with shared versions of libmysqlclient,
at least on some Linux boxes. If you receive an error message
similar to

  install_driver(mysql) failed: Can't load
  '/usr/lib/perl5/site_perl/i586-linux/auto/DBD/mysql/mysql.so'
  for module DBD::mysql: File not found at
  /usr/lib/perl5/i586-linux/5.00404/DynaLoader.pm line 166

then this error message can be misleading: It's not mysql.so
that fails being loaded, but libmysqlclient.so! The usual
problem is that this file is located in a directory like

  /usr/lib/mysql

where the linker doesn't look for it.

The best workaround is using a statically linked mysqlclient
library, for example

  /usr/lib/mysql/libmysqlclient.a

You force linking against this file by replacing

  -L/usr/lib/mysql -lmysqlclient

with

  /usr/lib/mysql/libmysqlclient.a

in the list of linker flags. L</Configuration>. L</Linker flags>.  

=item 4.)

Red Hat 8 & 9 set the Default locale to UTF which causes problems with 
MakeMaker.  To build DBD::mysql on these systems, do a 'unset LANG' 
before runing 'perl Makefile.PL'

=back


=head1 SUPPORT

Finally, if everything else fails, you are not alone. First of
all, for an immediate answer, you should look into the archives
of the mailing list B<msql-mysql-modules@lists.mysql.com>. See
http://www.mysql.com for archive locations.

If you don't find an appropriate posting and reply in the
mailing list, please post a question. Typically a reply will
be seen within one or two days.
