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class Database {
protected static $_pdo_instance;
private function __construct () { }
public function instance () {
if (!isset(static::$_pdo_instance)) {
$args = func_get_args();
try {
switch (count($args)) {
case 0:
throw new InvalidArgumentException("The first parameter is mandatory"); break;
case 1:
static::$_pdo_instance = new PDO($args[0]);
break;
case 2:
static::$_pdo_instance = new PDO($args[0], $args[1]);
break;
case 3:
static::$_pdo_instance = new PDO($args[0], $args[1], $args[2]);
break;
case 4:
static::$_pdo_instance = new PDO($args[0], $args[1], $args[2], $args[3]);
break;
default:
throw new BadMethodCallException(__METHOD__ . " takes at least 1 parameter and at most 4 parameters");
break;
}
}
catch (Exception $e) {
throw new RuntimeException("Cannot connect to database", 0, $e);
}
}
return static::$_pdo_instance;
}
public static function beginTransaction () {
return static::$_pdo_instance->beginTransaction();
}
public static function commit () {
return static::$_pdo_instance->commit();
}
public static function errorCode () {
return static::$_pdo_instance->errorCode();
}
public static function errorInfo () {
return static::$_pdo_instance->errorInfo();
}
public static function exec ($statement) {
return static::$_pdo_instance->exec($statement);
}
public static function getAttribute ($attribute) {
return static::$_pdo_instance->getAttribute($attribute);
}
public static function getAvailableDrivers () {
return static::$_pdo_instance->getAvailableDrivers();
}
public static function lastInsertId ($name = null) {
return static::$_pdo_instance->lastInsertId($name);
}
public static function prepare ($statement, $driver_options = array()) {
return static::$_pdo_instance->prepare($statement, $driver_options);
}
public static function query ($statment) {
return static::$_pdo_instance->query($statment);
}
public static function quote ($string, $parameter_type = PDO::PARAM_STR) {
return static::$_pdo_instance->quote($string, $parameter_type);
}
public static function rollBack () {
return static::$_pdo_instance->rollBack();
}
public static function setAttribute ($attribute, $value) {
return static::$_pdo_instance->setAttribute($attribute, $value);
}
} |
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