Database class based on Philip Brown's tutorial at http://culttt.com/2012/10/01/roll-your-own-pdo-php-class/

class.database.php

<?php

// Define database configuration
define("DB_HOST", $dblocation);
define("DB_USER", $dbusername);
define("DB_PASS", $dbpassword);
define("DB_NAME", $dbname);

class Database{
    private $host      = DB_HOST;
    private $user      = DB_USER;
    private $pass      = DB_PASS;
    private $dbname    = DB_NAME;

    private $dbh;
    private $error;
    private $stmt;
 
    public function __construct(){
        // Set DSN
        $dsn = 'mysql:host=' . $this->host . ';dbname=' . $this->dbname;
        // Set options
        $options = array(
            PDO::ATTR_PERSISTENT    => true,
            PDO::ATTR_ERRMODE       => PDO::ERRMODE_EXCEPTION
        );
        // Create a new PDO instanace
        try{
            $this->dbh = new PDO($dsn, $this->user, $this->pass, $options);
        }
        // Catch any errors
        catch(PDOException $e){
            $this->error = $e->getMessage();
        }
    }
    
    public function query($query){
        $this->stmt = $this->dbh->prepare($query);
    }

    public function bind($param, $value, $type = null){
        if (is_null($type)) {
            switch (true) {
                case is_int($value):
                    $type = PDO::PARAM_INT;
                    break;
                case is_bool($value):
                    $type = PDO::PARAM_BOOL;
                    break;
                case is_null($value):
                    $type = PDO::PARAM_NULL;
                    break;
                default:
                    $type = PDO::PARAM_STR;
            }
        }
        $this->stmt->bindValue($param, $value, $type);
    }

    public function execute(){
        return $this->stmt->execute();
    }    
    
    public function resultset(){
        $this->execute();
        return $this->stmt->fetchAll(PDO::FETCH_ASSOC);
    }
    
    public function single(){
        $this->execute();
        return $this->stmt->fetch(PDO::FETCH_ASSOC);
    }
    
    public function rowCount(){
        return $this->stmt->rowCount();
    }
    
    public function lastInsertId(){
        return $this->dbh->lastInsertId();
    }
    
    public function beginTransaction(){
        return $this->dbh->beginTransaction();
    }
    
    public function endTransaction(){
        return $this->dbh->commit();
    }
    
    public function cancelTransaction(){
        return $this->dbh->rollBack();
    }
    
    public function debugDumpParams(){
        return $this->stmt->debugDumpParams();
    }
    
    public function close(){
      $this->dbh = null;
    }

}

?>