Requerimientos
Please note that libmySQL.dll in MySQL bin directory should be renamed in order to use right library (that comes with PHP).
Instalación
Para compilar, simplemente usar la opción de configuración --with-mysql[=DIR] donde opcionalmente [DIR] apunta al directorio de instalación de MySQL.
Aunque esta extensión de MySQL es compatible con MySQL 4.1.0 y superior, no da soporte a las funcionalidades extra que estas versiones proveen. Para ello usar la extensión MySQLi.
Si se quisiera instalar la extensión de MySQL junto con la extensión MySQLi se debe usar la misma libreria de cliente para evitar cualquier conflicto.
Instalación en sistemas GNU Linux
PHP 4
La opción --with-mysql está habilitada por defecto. Este comportamiento predeterminado puede ser deshabilitado con la opción de configuración --without-mysql configure option. Si MySQL está habilitado sin especificar la ruta de acceso al directorio de instalación de MySQL, PHP usará las librerías de cliente de MySQL.
Los usuarios que ejecuten otras aplicaciones que usan MySQL (por ejemplo, auth-mysql) no deben usar la libreria incorporada, sino especificar la ruta al directorio de instalación de MySQL, por ejemplo: --with-mysql=/path/to/mysql . Esto obligará a PHP a usar las librerias de cliente instaladas por MySQL, evitando así cualquier conflicto.
PHP 5.0.x, 5.1.x, 5.2.x
MySQL no está habilitado por defecto, ni es una libreria incorporada con PHP. Leer esta FAQ para los detalles sobre por qué. Usar la opción de configuración--with-mysql[=DIR] para incluir el soporte de MySQL. Se pueden descargar headers y librerias desde » MySQL.
PHP 5.3.0+
En PHP 5.3.0 y sobre las extensiones relacionada con MySQL usa el driver nativo de MySQL por defecto. Esto significa que la libreria de cliente de MySQL (libmysql) ya no es requerida para soportar una conexión a una base de datos MySQL. Las extensiones mysql, mysqli, and PHP_PDO_MYSQL están todas habilitadas por defecto en PHP 5.3.0+, y todas usan el driver nativo de MySQL por defecto. En estos casos ya no hacen falta más pasos en la instalación para usar estas extensiones, aunque es posible que desee establecer algunas preferencias en el php.ini dependiendo de sus necesidades.
Instalación en sistemas Windows
PHP 4
La extensión PHP MySQL está compilada con PHP.
PHP 5.0.x, 5.1.x, 5.2.x
MySQL ya no está activado por defecto, así la DLLphp_mysql.dll debe ser habilitada dentro de php.ini. Además, PHP necesita acceso a la libreria de cliente de MySQL. Un archivo llamado libmysql.dll que está incluido en la distribución de PHP de Windows, y así PHP se comunica con MySQL, este fichero necesita estar disponible en el PATH de los sistemas Windows. Para información sobre como hacerlo ver el FAQ titulado "Cómo agrego mi directorio de PHP a PATH en Windows". Aunque copiando libmysql.dll al directorio del sistema de Windows también funcionará (por qué el directorio del sistema está por defecto en el PATH del sistema), pero no está recomendado.
Como ocurre con cualquier otra extensión de PHP (tal como php_mysql.dll), la directiva de PHP extension_dir, debe establecer el directorio donde estan localizada las extensiones de PHP. Ver también See also the Manual de instrucciónes de instalación en Windows. Un ejemplo de valor de extension_dir para PHP 5 es c:\php\ext
Note:
Si al iniciar el servidor web se produce un error similar al siguiente: "Unable to load dynamic library './php_mysql.dll'", esto se debe a que php_mysql.dll y/o libmysql.dll no puede ser encontrado por el sistema.
PHP 5.3.0+
Por favor, consulte estas notas para instalar el soporte de MySQL en PHP 5.3.0 y superiores.
Notas de la instalación de MySQL
Warning
Se pueden encontrar errores y problemas de inicio de PHP al cargar esta extensión en conjunción con la extensión recode. Para más información ver la extension recode.
Note:
Si se necesitan otros caracteres que los latin (por defecto), se ha de instalar externamente libmysql con el soporte para el juego de caracteres compilado (no incluido).
add a note
User Contributed Notes
Instalación
o dot kochetilov at gmail dot com
30-Apr-2011 07:39
buzzr515 at gmx dot de
03-Sep-2010 04:13
i've experienced a similar (if not the same) problem.
to enable the mysql_... and mysqli_... funtionality, i opened the php.ini file to uncomment the following lines:
;extension=php_mysql.dll
;extension=php_mysqli.dll
;extension=php_pdo_mysql.dll
but phpinfo() still stated that no mysql extensions were loaded.
i tried the fixes and suggestions above with no success.
so i invoked the windows shell and typed ("Path" environment variable set to the PHP & MySQL directories):
php.exe -m
this returned the following error: "PHP Startup: Unable to load dynamic library 'C:\php5\php_mysql.dll' - Module not found."
this told me that PHP didn't recognize what i thought was the extensions directory. it searched all other places first (sys-dir, workin'-dir, the MySQL "bin" dir because of the "Path" variable set, and even a curious directory "C:\php5" that doesn't even exist on my mashine) but not the expected "ext" directory.
so the fix was to go to "php.ini" again and uncomment the following line:
;extension_dir="ext"
this fixed it for me.
so if module loading is done improperly, first of all check the "Path" environment variable and the "php.ini" file - especially the "extension_dir" config value - and check if all values are set to their correct values.
hope this helps any1.
----------------------------------------
OS: Win7 Ultimate x86
Apache v2.2.16
PHP v5.3.3
MySQL v5.1.50
titus at antennasystems dot com
28-Jun-2010 05:00
I ran into the soon to be infamous problem of upgrading to PHP 5.3.x.
The way I found to resolve the issue was to
1: Do "mysql_upgrade" on the server (to make MySQL compliant with MySQL 4.1+).
2: Modify my.cf to not use old passwords:
(Just comment out "old_passwords=1")
#old_passwords=1
3: Change the root password so you can properly connect to the server:
SET PASSWORD FOR 'root'@'localhost' = PASSWORD('enter_new_password_here');
http://dev.mysql.com/doc/refman/5.1/en/old-client.html
http://tinyurl.com/mysql-old-password
Taken from http://www.comsiteconstruction.com/blueonyx-modifications
samishiikihaku23 at gmail dot com
17-Jun-2010 06:36
I've checked all the 5.3 distribution files from http://windows.php.net/ for the "libmysql.dll" file that this article claims is in the distributions.
None of the 5.3 dist. supplies "libmysql.dll". Download the recent 5.2 release for the file.
heneryville at gmail dot com
30-Apr-2010 08:32
I believe that this is happens especially with Windows 7. As far I I've been able to tell XP and Vista come with this line enabled, but windows 7 comments it out and notes that the DNS will handle this.
jez300
10-Mar-2010 01:34
Windows 7 / Vista:
This took me hours to realise... If you receive the message:
Warning: mysql_connect(): [2002] A connection attempt failed because the connected party did not (trying to connect via tcp://localhost:3306)
You may need to map localhost to your IP address (127.0.0.1) which is used to find your Mysql server.
Edit {systemdrive}:\Windows\System32\drivers\etc
Make sure "127.0.0.1 localhost" isn't commented out with # at the begining of the line!
-----
You may also like to know that if you change from MySQL 32 bit to 64 bit and the Mysql service wont start you may need to rename or delete your Mysql data
{systemdrive}:\ProgramData\x MySQL\MySQL Server 5.1\data
Regards,
Jez.
amatsak at gmail dot com
22-Jun-2009 09:46
I have experienced exactly the same problem as flo_stefi at yahoo dot com below. It appears that instead of loading libmysql.dll that came with the PHP package, the PHP engine was loading libmySQL.dll located in MySQL's bin directory, which was causing Apache to crash.
I fixed the problem by renaming MySQL's libmySQL.dll into libmySQL_renamed.dll. Now PHP loads the library that came with its package and everything works fine.
flo_stefi at yahoo dot com
01-Apr-2009 12:10
I had a problem to make mysql work with php on Windows. Using mysql-5.1.32-win32 and php-5.2.9-1-win32-installer I've installed mysql and php. All seemed to be ok (phpinfo displayed the right information) but when running a basic script mysql_connect(..) the apache ends with a stupid error like "[Wed Apr 01 14:44:05 2009] [notice] Parent: child process exited with status 3221225477 -- Restarting.".
I manage to fix it by using instead of libMySQL.dll from mysql package another version (libmysql.dll) I had from a previous installation.
lobbanhousehold at gmail dot com
12-Feb-2009 03:05
I figured my problem why php and mysql weren't working together even though they worked independent of each other. PHP was configured with IIS 5.1 (XP) using the php5isapi.dll file.
I also set system variables in PATH adding the locations of both php and mysql folders. I also moved the mysql DLL files from ext folder to the root folder of php.
I discovered that php would not work with mysql if php folder was not located on the C:\ (i.e. C:\php). I also renamed the libmysql.dll that came with mysql so that the system would not see it, and moved the one that came with php to C:\WINDOWS\system32.
After I did this last paragraph i was able to see MySQL and MySQLi sections listed in phpinfo() which indicates MySQL is finally enabled
admin at kobashicomputing dot com
02-Nov-2008 07:02
Unfortunately this one bit me for a good half day.
Placing libmysql.dll in the php/ext directory did not work. I tested this under 5.6.2. You need to have it somewhere in the PATH or in SYSTEM or SYSTEM32. But to me this is very silly to force the user to have to setup environment variables or move DLLs around. It shouldn't have to go that far and be the responsibility of the setup program and/or developer.
I really think this issue could be solved doing this:
1) Installer/distribution bundle all three files together under one directory (ext) - php_mysql.dll/php_mysqli.dll/libmysql.dll
2) Developer goes into php_mysql.dll/php_mysqli.dll and in DllMain() on DLL_PROCESS_ATTACH:
LoadLibrary ("./libmysql.dll");
Then you don't have to deal with this problem and neither do your users.
Kerry Kobashi
rogerc at clubsites dot net
20-Jul-2008 02:05
This error also occurs if the windows path entry for an older version of MYSQL appears before the path entry for a late version of php. In which case the version of libmysl.dll in the MySQL bin directory will be found before the one bundled with php. Reversing the system path entries so php is first fixes this problem. e.g.
PATH= ... c:\php;C:\Program Files\MySQL\MySQL Server 4.1\bin
Mahesh
13-Jun-2008 09:37
In windows systems, the error "unable to load dynamic library php_mysql.dll" also happens if there's an old version of the file libmysql.dll in the "windows\system32" folder.
jonnus
12-May-2008 12:42
In windows systems, the same error "unable to load dynamic library php_mysql.dll" will happen, if there's an old version of the file in the "windows\system32" folder.
Either remove it or update it.