diff --git a/Project/php/gateway/AbsGateway.php b/Project/php/gateway/AbsGateway.php
index 2d47f38..0b3ebfc 100755
--- a/Project/php/gateway/AbsGateway.php
+++ b/Project/php/gateway/AbsGateway.php
@@ -10,8 +10,11 @@ abstract class AbsGateway
 {
     protected Connection $con;
 
-    public function __construct(Connection $con) {
-        $this->con = $con;
+    public function __construct() {
+        global $dsn;
+        global $login;
+        global $password;
+        $this->con = new Connection($dsn, $login, $password);
     }
 
     public abstract function add(array $parameters): int;
diff --git a/Project/php/gateway/GroupGateway.php b/Project/php/gateway/GroupGateway.php
index f089c1f..3cae42d 100755
--- a/Project/php/gateway/GroupGateway.php
+++ b/Project/php/gateway/GroupGateway.php
@@ -10,8 +10,8 @@ use model\Group;
 
 class GroupGateway extends AbsGateway
 {
-    public function __construct(Connection $con){
-        parent::__construct($con);
+    public function __construct(){
+        parent::__construct();
     }
 
     public function add(array $parameters): int //require 4 elements
diff --git a/Project/php/gateway/UserGateway.php b/Project/php/gateway/UserGateway.php
index 273b761..fcb5557 100755
--- a/Project/php/gateway/UserGateway.php
+++ b/Project/php/gateway/UserGateway.php
@@ -9,9 +9,9 @@ use Exception;
 
 class UserGateway extends AbsGateway
 {
-    public function __construct(Connection $con)
+    public function __construct()
     {
-        parent::__construct($con);
+        parent::__construct();
     }
 
     public function add(array $parameters): int //require 9 elements
diff --git a/Project/php/gateway/VocabularyGateway.php b/Project/php/gateway/VocabularyGateway.php
index 4aee47e..b0ed969 100755
--- a/Project/php/gateway/VocabularyGateway.php
+++ b/Project/php/gateway/VocabularyGateway.php
@@ -3,13 +3,13 @@ namespace gateway;
 
 use PDO;
 use PDOException;
-use config\Connection;
+use Exception;
 use model\Vocabulary;
 
 class VocabularyGateway extends AbsGateway
 {
-    public function __construct(Connection $con){
-        parent::__construct($con);
+    public function __construct(){
+        parent::__construct();
     }
 
     public function add(array $parameters): int // require 4 elements