My code was working all fine yesterday and today it suddenly just don’t want to connect to my database. I have changed no settings on it or on the code and I haven’t updated any software either. All I do is this:
new PDO('mysql:host=localhost;port=3306;dbname=test', 'username', 'password');
And I get a nice exception message saying this:
Warning: PDO::__construct():  No such file or directory (trying to connect via unix:///tmp/mysql.sock) in …
The thing is: I’m clearly not trying to connect using a unix socket but using TCP/IP. What am I doing wrong? Is there something I’m missing here?
Thanks for any help.
You are using a Unix socket. When reading “localhost” MySQL client libraries don’t interpret it as TCP host “localhost” and resolve that name but use the default Socket location. For using TCP on the local machine you have to use
127.0.0.1 as hostname.
To specify the past use
host in the DSN. The location of the socket used for
localhost can be defined at compile time or in some versions of PHP using
pdo_mysql.default_socket in the
From the PHP documentation about connection to MySQL using PDO: PDO_MYSQL DNS
The note at the very end says:
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.
So in order to fix this you would have to properly configure in php.ini the location of your mysql.sock
Find your mysql.sock file. Common locations:
- or if you use MAMP or LAMP look for inside the tmp folder for mysql
Edit your php.ini file and properly set the value for pdo_mysql.default_socket
Restart your Apache server to pickup the changes in the php.ini file
On Ubuntu, you can use this setting in php.ini
I just added this line:
'unix_socket' => '/Applications/XAMPP/xamppfiles/var/mysql/mysql.sock',
and all was well.
There’s an update to the docs for Drush which is documented here.