PHP - MYSQL - test database server

Question

I'm learning PHP MYSQL and trying to create a database.

I'm following this tutorial http://www.raywenderlich.com/2941/how-to-write-a-simple-phpmysql-web-service-for-an-ios-app

So far I'm testing to see if the server has access to MySQL. When I use the following code.

?php

class RedeemAPI {
   private $db;

   // Constructor - open DB connection
   function __construct() {
       $this->db = new mysqli('localhost', 'username', 'password', 'promos');
    $this->db->autocommit(FALSE);
}

// Destructor - close DB connection
function __destruct() {
    $this->db->close();
}

// Main method to redeem a code
function redeem() {
    // Print all codes in database
    $stmt = $this->db->prepare('SELECT id, code, unlock_code, uses_remaining FROM rw_promo_code');
    $stmt->execute();
    $stmt->bind_result($id, $code, $unlock_code, $uses_remaining);
    while ($stmt->fetch()) {
        echo "$code has $uses_remaining uses remaining!";
    }
    $stmt->close();
   }
} 
// This is the first thing that gets called when this page is loaded
// Creates a new instance of the RedeemAPI class and calls the redeem method
$api = new RedeemAPI;
$api->redeem();

?

I get the following error:

Warning: mysqli::mysqli() [mysqli.mysqli]: [2002] No such file or directory (trying to connect via unix:///var/mysql/mysql.sock) in /Users/user/Sites/promos/index.php on line 8

Warning: mysqli::mysqli() [mysqli.mysqli]: (HY000/2002): No such file or directory in /Users/user/Sites/promos/index.php on line 8

Warning: mysqli::autocommit() [mysqli.autocommit]: Couldn't fetch mysqli in /Users/user/Sites/promos/index.php on line 9

Warning: mysqli::prepare() [mysqli.prepare]: Couldn't fetch mysqli in /Users/user/Sites/promos/index.php on line 20

Fatal error: Call to a member function execute() on a non-object in /Users/user/Sites/promos/index.php on line 21

Did I perhaps forget to enable something?

It might explain why I cannot connect via my IP address to sequel pro and only to 127.0.0.1?

Answer 1

Apache servers use '127.0.0.1' instead of 'localhost'

Answer 2

There are two settings you have to check for this to work (assuming you have MySQL server installed of course):

Check the value of mysql.default_socket in your PHP configuration.

Check the value of socket in your MySQL configuration file under the [mysqld] heading.

Those values have to be identical; if they're not, change one to match the other and restart respective service.

Answer 3

This seems to be a common issue, as googling for it yields quite a few results. I experienced this on my two linux boxes as well (never under Windows though) and at some point I resolved to just use 127.0.0.1 on all dev servers. Basically, localhost makes the connection to the MySQL server use a socket, but your configuration doesn't point to the socket file correctly.

Here are a couple of resources that you might find useful:

http://westsworld.dk/blog/2011/03/problems-connecting-to-unixvarmysqlmysql-sock/ - basically what @Jack suggests, but more in depth

Can't connect to MySQL on Mac -- missing mysql.sock file - here's how to locate your socket file (for some reason, my php.ini had the path wrong, and I assume your case could be similar).

I hope this helps.