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<?php
class Db
{
/* @var Db $instance */
private static $instance;
/* @var IDb $adapter */
private $adapter;
private $link;
/* @var PDO $pdo */
private $pdo;
private function __clone() {
//
}
private function legacy_connect() {
user_error("Legacy connect requested to " . DB_TYPE, E_USER_NOTICE);
$er = error_reporting(E_ALL);
switch (DB_TYPE) {
case "mysql":
$this->adapter = new Db_Mysqli();
break;
case "pgsql":
$this->adapter = new Db_Pgsql();
break;
default:
die("Unknown DB_TYPE: " . DB_TYPE);
}
if (!$this->adapter) {
print("Error initializing database adapter for " . DB_TYPE);
exit(100);
}
$this->link = $this->adapter->connect(DB_HOST, DB_USER, DB_PASS, DB_NAME, defined('DB_PORT') ? DB_PORT : "");
if (!$this->link) {
print("Error connecting through adapter: " . $this->adapter->last_error());
exit(101);
}
error_reporting($er);
}
// this really shouldn't be used unless a separate PDO connection is needed
// normal usage is Db::pdo()->prepare(...) etc
public function pdo_connect() {
$db_port = defined('DB_PORT') && DB_PORT ? ';port=' . DB_PORT : '';
$db_host = defined('DB_HOST') && DB_HOST ? ';host=' . DB_HOST : '';
try {
$pdo = new PDO(DB_TYPE . ':dbname=' . DB_NAME . $db_host . $db_port,
DB_USER,
DB_PASS);
} catch (Exception $e) {
print "<pre>Exception while creating PDO object:" . $e->getMessage() . "</pre>";
exit(101);
}
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
if (DB_TYPE == "pgsql") {
$pdo->query("set client_encoding = 'UTF-8'");
$pdo->query("set datestyle = 'ISO, european'");
$pdo->query("set TIME ZONE 0");
$pdo->query("set cpu_tuple_cost = 0.5");
} else if (DB_TYPE == "mysql") {
$pdo->query("SET time_zone = '+0:0'");
if (defined('MYSQL_CHARSET') && MYSQL_CHARSET) {
$pdo->query("SET NAMES " . MYSQL_CHARSET);
}
}
return $pdo;
}
public static function instance() {
if (self::$instance == null)
self::$instance = new self();
return self::$instance;
}
public static function get() {
if (self::$instance == null)
self::$instance = new self();
if (!self::$instance->adapter) {
self::$instance->legacy_connect();
}
return self::$instance->adapter;
}
public static function pdo() {
if (self::$instance == null)
self::$instance = new self();
if (!self::$instance->pdo) {
self::$instance->pdo = self::$instance->pdo_connect();
}
return self::$instance->pdo;
}
}
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