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PDO_MYSQL DSN
(PECL PDO_MYSQL >= 0.1.0)
PDO_MYSQL DSN — Connecting to MySQL databases
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 MySQL Unix socket (shouldn't be used with host or port).
- charset
-
The character set. See the character set concepts documentation for more information.
Prior to PHP 5.3.6, this element was silently ignored. The same behaviour can be partly replicated with the
PDO::MYSQL_ATTR_INIT_COMMANDdriver option, as the following example shows.WarningThe 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 #1 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);
?>
Examples
Example #2 PDO_MYSQL DSN examples
The following example shows a PDO_MYSQL DSN for connecting to MySQL databases:
mysql:host=localhost;dbname=testdb
mysql:host=localhost;port=3307;dbname=testdb mysql:unix_socket=/tmp/mysql.sock;dbname=testdb
Notes
Note: 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 libmysqlclient then the location of the socket file is at libmysqlclient'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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Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-ref.pdo-mysql.connection.html
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References
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The author This site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.
