Developing MySQL Database Applications With PHP Part 1: Using the MySQL Improved Exte

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pdo_mysql-dsn

PDO_MYSQL-DSN(3)							 1							  PDO_MYSQL-DSN(3)

PDO_MYSQL DSN - Connecting to MySQL databases

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

	      o DSN prefix
		- The DSN prefix is mysql:.

	      o host - The hostname on which the database server resides.

	      o port - The port number where the database server is listening.

	      o dbname - The name of the database.

	      o unix_socket - The MySQL Unix socket (shouldn't be used with host or port).

	      o 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_COMMAND driver option, as the fol-
		lowing 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 #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);
		     ?>

       +--------+-----------------------------------------------+
       |Version |						|
       |	|						|
       |	|		   Description			|
       |	|						|
       +--------+-----------------------------------------------+
       | 5.3.6	|						|
       |	|						|
       |	|  Prior to version 5.3.6, charset was ignored. |
       |	|						|
       +--------+-----------------------------------------------+
       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

       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.

PHP Documentation Group 													  PDO_MYSQL-DSN(3)

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