PDO_MYSQL DSN


Description

The PDO_MYSQL Data Source Name (DSN) is composed of the following elements:

DSN prefix

The DSN prefix is mysql:.

host

The hostname on which the database server resides.

port

The port number where the database server is listening.

dbname

The name of the database.

unix_socket

The MariaDB Unix socket (shouldn't be used with host or port).

charset

The character set.

Prior to PHP 5.3.6, this element was silently ignored. The same behaviour can be partly replicated with the PDO::MYSQL_ATTR_INIT_COMMAND driver option, as the following example shows.Warning

The method in the below example can only be used with character sets that share the same lower 7 bit representation as ASCII, such as ISO-8859-1 and UTF-8. Users using character sets that have different representations (such as UTF-16 or Big5) must use the charset option provided in PHP 5.3.6 and later versions.

Example 20.205. Setting the connection character set to UTF-8 prior to PHP 5.3.6

<?php
$dsn = 'mysql:host=localhost;dbname=testdb';
$username = 'username';
$password = 'password';
$options = array(
 PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8',
); 
$dbh = new PDO($dsn, $username, $password, $options);
?>

Changelog

Version Description
5.3.6 Prior to version 5.3.6, charset was ignored.

Examples

Example 20.206. PDO_MYSQL DSN examples

The following example shows a PDO_MYSQL DSN for connecting to MariaDB databases: 

mysql:host=localhost;dbname=testdb

More complete examples: 

mysql:host=localhost;port=3307;dbname=testdb mysql:unix_socket=/tmp/mysql.sock;dbname=testdb

Notes

Unix only:

When the host name is set to 'localhost', then the connection to the server is made thru a domain socket. If PDO_MYSQL is compiled against libmysql then the location of the socket file is at libmysql's compiled in location. If PDO_MYSQL is compiled against mysqlnd a default socket can be set thru the pdo_mysql.default_socket setting.

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