PHP - Manual: PDO_MYSQL DSN

2024-12-21

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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 or port).
charset: The character set. See the character set concepts documentation for more information.

范例

示例 #1 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

注意: Unix only:
When the host name is set to "localhost", then the connection to the server is made through 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 through the pdo_mysql.default_socket setting.

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User Contributed Notes 8 notes

down

codeslinger at compsalot dot com ¶

13 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.

down

rhian ¶

5 years ago


xwisdom made a mistake in his comment and got it backwards, correction below:

If you are having problems accessing a remote MYSQL database, the solution is to make sure that you add a white-space after "mysql:"

Change this...:
mysql:host=remote;

...to this:
mysql: host=remote;

See original solution here:
http://stackoverflow.com/a/25432156

down

divinity76 at gmail dot com ¶

2 years ago


here is the example i prefer myself, in my opinion, this is almost always "the correct way" to do it:

<?php


$db = new \PDO('mysql:host=localhost;dbname=testdb;charset=utf8mb4', 'username', 'password', array(

    \PDO::ATTR_EMULATE_PREPARES => false,

    \PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION

));

down

FireDev ¶

2 years ago


The best way for me

$bdd= new PDO("mysql:host=localhost;dbname=test_db;charset=UTF8", "username", "password");
$bdd->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING);

down

-1

anrdaemon at yandex dot ru ¶

3 months ago


Wrappers may add support for extra parameters in the DSN, which are ignored by PDO itself, but facilitate more fine-grained connection setup.

F.e. localization (particularly LC_TIME) and timezones support.

https://github.com/AnrDaemon/library-php/blob/335e9e58f22cca8c185b35cf201ad0a367ae4c9f/src/Wrappers/PDOMysql.php#L54-L69

down

siguza at siguza dot net dot IGNORETHIS ¶

7 years ago


It should be noted that unix_socket can also be used for named pipes under Windows.

<?php
$pipeName = 'my_awesome_pipe';
$username = 'username';
$password = 'password';
$dbh = new PDO('mysql:unix_socket='.$pipeName, $username, $password);
?>

down

-14

xwisdom at gmail dot com ¶

6 years ago


If you are having problems accessing a remote MYSQL database, the solution is to make sure that you remove any white-space after "mysql:" 

Change this...:
mysql: host=remote;

...to this:
mysql:host=remote;

See original solution here:
http://stackoverflow.com/a/25432156

down

-8

yuqiangliu at outlook dot com ¶

3 years ago


$options = array(
    PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8',
); 

SET NAMES utf8 is equivalent to

SET character_set_client = utf8;
SET character_set_results = utf8;
SET character_set_connection = utf8;

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官方地址：https://www.php.net/manual/en/ref.pdo-mysql.connection.php

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PDO_MYSQL DSN

说明

范例

注释

User Contributed Notes 8 notes