PDO connection to MySQL database refused

问题

I am trying to connect to my NearlyFreeSpeech MySQL database. I can login through PHPMyAdmin but not through PDO. I am using this code

 $dbconn = new PDO('mysql:host=127.0.0.1;dbname='.$config['db'].'; port=3307', $config['user'], $config['pass']);

Where $config is defined in a separate file. The error I get is:

Warning: PDO::__construct() [pdo.--construct]: [2002] Connection refused (trying to connect via tcp://127.0.0.1:3307) 
Error: SQLSTATE[HY000] [2002] Connection refused

and then eventually

Fatal error: Call to a member function query() on a non-object in...

If I use

mysql:host=localhost

The error I get is

Error: SQLSTATE[HY000] [2002] No such file or directory

Now I assume "Connection refused" is better than "No such file or directory", but I don't know where to go from here. Any idea why this is happening? Thank you for your help.

回答1:

Try my existing functions and constant variables, you may also change those constant to an array variable you have.

define("SERVER_SQL_VERSION","mysql");
define("SQL_SERVER","localhost");
define("SQL_PORT","3306");
define("SQL_USERNAME","root");
define("SQL_PASSWORD","");
define("SQL_DB_NAME","db");

if(!function_exists('pdoConnect')) {
    function pdoConnect() {
        $pdo = new PDO(SERVER_SQL_VERSION.":host=".SQL_SERVER.";dbname=".SQL_DB_NAME."", "".SQL_USERNAME."", "".SQL_PASSWORD.""); 
        $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
        $pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
        return $pdo;
    }
}

There might be an issue about your concatenation, this must be working...

I also seperated the SERVER_SQL_VERSION, and added a functions to check if the driver is available...I am using the XAMPP software and only mysql and sqlite is active, if you/others try to use postgresql and so on...that must be working as well.

if(!function_exists('check_sql_version')) {
    function check_sql_version() {
        $sql_available = false;     //make it false yet
        foreach(PDO::getAvailableDrivers() as $key => $val) {
            if(SERVER_SQL_VERSION == $val)
            {
                $sql_available = true;
            }
        }
        //check now if sql_available is true or false
        if($sql_available == true)
            return true;
        else
            return false;
    }
}

So a sample should be considered:

if(!check_sql_version()) {
    echo '('.SERVER_SQL_VERSION.') is not available, you only have this drivers:<br/>';
    foreach(PDO::getAvailableDrivers() as $key => $val) {
        $key = $key + 1;
        echo $key.') '.$val.'<br/>';
    }
    exit(); //exit and dont proceed
}
$stmt = pdoConnect()->prepare("SELECT * FROM accounts");
$stmt->execute();

I hope it helps!

来源：https://stackoverflow.com/questions/16267727/pdo-connection-to-mysql-database-refused

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database

pdo