Php/docs/ref.pdo-mysql.connection
PDO_MYSQL DSN
(PECL PDO_MYSQL >= 0.1.0)
PDO_MYSQL DSN — Connecting to MySQL databases
说明
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
orport
).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 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 #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);?>
范例
Example #2 PDO_MYSQL DSN examples
The following example shows a PDO_MYSQL DSN for connecting to MySQL databases:
mysql:host=localhost;dbname=testdb
More complete examples:
mysql:host=localhost;port=3307;dbname=testdb mysql:unix_socket=/tmp/mysql.sock;dbname=testdb
注释
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.