PHP Australia Conference 2015

PDO_MYSQL DSN

(PECL PDO_MYSQL >= 0.1.0)

PDO_MYSQL DSNConnecting to MySQL databases

Opis

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_COMMAND driver option, as the following example shows.

Ostrzeżenie

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.

Przykład #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);
?>

Rejestr zmian

Wersja Opis
5.3.6 Prior to version 5.3.6, charset was ignored.

Przykłady

Przykład #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

Notatki

Informacja: 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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User Contributed Notes 4 notes

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16
codeslinger at compsalot dot com
5 years ago
I have tested this and found that the "dbname" field is optional.  Which is a good thing if you must first create the db.

After creating a db be sure to exec a "use dbname;"  command, or else use fully specified table references.
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-6
rustamabd at gmail dot com
5 years ago
Even though pdo_mysql accepts an additional "charset" parameter in the DSN (see mysql_driver.c:442), as of PHP 5.2.9 it does not do anything with it.

A possible workaround to set the charset to UTF-8, for example, could be:
<?php

    $dbh
= new PDO("mysql:$connstr"$user, $password);

   
$dbh -> exec("set names utf8");

?>
up
-6
damien at mc-kenna dot com
2 years ago
It appears that internally the host string infers a default of "localhost", e.g. this appears to work as a valid $dsn: mysql:host=;port=3306
up
-10
johne dot doe at hotmail dot com
7 months ago
on unix machines create a php file with the following content:

<?php>
phpinfo();
?>

and execute it. Search for MYSQL_SOCKET or mysqli.default_socket to get the correct path for unixsocket= ...
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