diff --git a/classes/Db.php b/classes/Db.php
index d8749b6eb..580c6d781 100644
--- a/classes/Db.php
+++ b/classes/Db.php
@@ -175,7 +175,7 @@ abstract class DbCore
 		}
 
 		if (!isset(self::$_instance[$idServer]))
-			self::$_instance[$idServer] = Db::newInstance(self::$_servers[$idServer]['server'], self::$_servers[$idServer]['user'], self::$_servers[$idServer]['password'], self::$_servers[$idServer]['database']);
+			self::$_instance[$idServer] = Db::factory(self::$_servers[$idServer]['server'], self::$_servers[$idServer]['user'], self::$_servers[$idServer]['password'], self::$_servers[$idServer]['database']);
 
 		return self::$_instance[$idServer];
 	}
@@ -190,7 +190,7 @@ abstract class DbCore
 	 * @param bool $connect If false, don't connect in constructor
 	 * @return Db
 	 */
-	public static function newInstance($server, $user, $password, $database, $connect = true)
+	public static function factory($server, $user, $password, $database, $connect = true)
 	{
 		$class = 'MySQL';
 		if (class_exists('mysqli', false))
@@ -509,8 +509,7 @@ abstract class DbCore
 	 */
 	static public function checkConnection($server, $user, $pwd, $db)
 	{
-		$instance = Db::newInstance($server, $user, $pwd, $db, false);
-		return $instance->tryConnection();
+		return Db::factory($server, $user, $pwd, $db, false)->tryConnection();
 	}
 
 		/**
@@ -526,8 +525,7 @@ abstract class DbCore
 	 */
 	static public function checkEncoding($server, $user, $pwd, $encoding = 'UTF8')
 	{
-		$instance = Db::newInstance($server, $user, $pwd, '', false);
-		return $instance->tryEncoding($encoding);
+		return Db::factory($server, $user, $pwd, '', false)->tryEncoding($encoding);
 	}
 
 	/**
diff --git a/classes/MySQL.php b/classes/MySQL.php
index ef52da264..5f526943f 100644
--- a/classes/MySQL.php
+++ b/classes/MySQL.php
@@ -139,7 +139,7 @@ class MySQLCore extends Db
 	/**
 	 * @see DbCore::tryConnection()
 	 */
-	public function tryConnection($server, $user, $pwd, $db, $newDbLink = true)
+	public function tryConnection($newDbLink = true)
 	{
 		if (!$link = @mysql_connect($server, $user, $pwd, $newDbLink))
 			return 1;
@@ -152,7 +152,7 @@ class MySQLCore extends Db
 	/**
 	 * @see DbCore::tryEncoding()
 	 */
-	public function tryEncoding($server, $user, $pwd, $encoding = 'UTF8')
+	public function tryEncoding($encoding = 'UTF8')
 	{
 		$link = @mysql_connect($server, $user, $pwd);
 		if (!mysql_query('SET NAMES \''.pSQL($encoding).'\'', $link))
@@ -164,15 +164,7 @@ class MySQLCore extends Db
 	}
 
 	/**
-	 * tryToConnect return 0 if the connection succeed and the database can be selected.
-	 * @since 1.4.4.0, the parameter $newDbLink (default true) has been added.
-	 * 
-	 * @param string $server mysql server name
-	 * @param string $user mysql user
-	 * @param string $pwd mysql user password
-	 * @param string $db mysql database name
-	 * @param boolean $newDbLink if set to true, the function will not create a new link if one already exists.
-	 * @return integer
+	 * @deprecated since 1.5.0
 	 */
 	public static function tryToConnect($server, $user, $pwd, $db, $newDbLink = true)
 	{
@@ -184,6 +176,9 @@ class MySQLCore extends Db
 		return 0;
 	}
 
+	/**
+	 * @deprecated since 1.5.0
+	 */
 	static public function tryUTF8($server, $user, $pwd)
 	{
 		$link = @mysql_connect($server, $user, $pwd);