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.
(PECL PDO_MYSQL >= 0.1.0)
PDO_MYSQL DSN — Connecting to MySQL databases
The PDO_MYSQL Data Source Name (DSN) is composed of the following elements:
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.
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);
?>
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
Notă: 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.
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.
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
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);
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
));
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
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);
?>
$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;
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