diff --git a/server_files/classes/Team.php b/server_files/classes/Team.php
index 08a2e02..094b1ce 100644
--- a/server_files/classes/Team.php
+++ b/server_files/classes/Team.php
@@ -16,7 +16,9 @@ class Team
 	private $access_code;
 	private $year;
 
-	public function __construct($id)
+	private function __construct() {}
+
+	public static function fromId($id)
 	{
 		global $DB;
 		$req = $DB->prepare("SELECT * FROM `teams` WHERE `id` = ?;");
@@ -26,7 +28,29 @@ class Team
 		if ($data === false)
 			throw new InvalidArgumentException("L'équipe spécifiée n'existe pas.");
 
-		$this->id = $id;
+		$team = new Team();
+		$team->fill($data);
+		return $team;
+	}
+
+	public static function fromTrigram($trigram)
+	{
+		global $DB, $YEAR;
+		$req = $DB->prepare("SELECT * FROM `teams` WHERE `trigram` = ? AND `year` = $YEAR;");
+		$req->execute([htmlspecialchars($trigram)]);
+		$data = $req->fetch();
+
+		if ($data === false)
+			throw new InvalidArgumentException("L'équipe spécifiée n'existe pas.");
+
+		$team = new Team();
+		$team->fill($data);
+		return $team;
+	}
+
+	private function fill($data)
+	{
+		$this->id = $data["id"];
 		$this->name = $data["name"];
 		$this->trigram = $data["trigram"];
 		$this->tournament = $data["tournament"];
diff --git a/server_files/classes/Tournament.php b/server_files/classes/Tournament.php
index 748cca8..fd4cd69 100644
--- a/server_files/classes/Tournament.php
+++ b/server_files/classes/Tournament.php
@@ -17,9 +17,11 @@ class Tournament
     private $final;
     private $year;
 
-    public function __construct($id)
-    {
-        global $DB;
+    private function __construct() {}
+
+	public static function fromId($id)
+	{
+		global $DB;
 		$req = $DB->prepare("SELECT * FROM `tournaments` WHERE `id` = ?;");
 		$req->execute([htmlspecialchars($id)]);
 		$data = $req->fetch();
@@ -27,7 +29,29 @@ class Tournament
 		if ($data === false)
 			throw new InvalidArgumentException("Le tournoi spécifié n'existe pas.");
 
-		$this->id = $id;
+		$tournament = new Tournament();
+		$tournament->fill($data);
+		return $tournament;
+	}
+
+	public static function fromName($name)
+	{
+		global $DB, $YEAR;
+		$req = $DB->prepare("SELECT * FROM `tournaments` WHERE `name` = ? AND `year` = $YEAR;");
+		$req->execute([htmlspecialchars($name)]);
+		$data = $req->fetch();
+
+		if ($data === false)
+			throw new InvalidArgumentException("Le tournoi spécifié n'existe pas.");
+
+		$tournament = new Tournament();
+		$tournament->fill($data);
+		return $tournament;
+	}
+
+    private function fill($data)
+	{
+		$this->id = $data["id"];
 		$this->name = $data["name"];
 		$this->size = $data["size"];
 		$this->place = $data["place"];
@@ -40,7 +64,7 @@ class Tournament
 		$this->date_syntheses = $data["date_syntheses"];
 		$this->final = $data["final"] == true;
 		$this->year = $data["year"];
-    }
+	}
 
 	public function getId()
 	{
diff --git a/server_files/classes/User.php b/server_files/classes/User.php
index 692c678..0f7afad 100644
--- a/server_files/classes/User.php
+++ b/server_files/classes/User.php
@@ -27,8 +27,10 @@ class User
 	private $year;
 	private $confirm_email;
 	private $forgotten_password;
+	
+	private function __construct() {}
 
-	public function __construct($id)
+	public static function fromId($id)
 	{
 		global $DB;
 		$req = $DB->prepare("SELECT * FROM `users` WHERE `id` = ?;");
@@ -38,7 +40,29 @@ class User
 		if ($data === false)
 			throw new InvalidArgumentException("L'utilisateur spécifié n'existe pas.");
 
-		$this->id = $id;
+		$user = new User();
+		$user->fill($data);
+		return $user;
+	}
+
+	public static function fromEmail($email)
+	{
+		global $DB, $YEAR;
+		$req = $DB->prepare("SELECT * FROM `users` WHERE `email` = ? AND `year` = $YEAR;");
+		$req->execute([htmlspecialchars($email)]);
+		$data = $req->fetch();
+
+		if ($data === false)
+			throw new InvalidArgumentException("L'utilisateur spécifié n'existe pas.");
+
+		$user = new User();
+		$user->fill($data);
+		return $user;
+	}
+	
+	private function fill($data)
+	{
+		$this->id = $data["id"];
 		$this->email = $data["email"];
 		$this->pwd_hash = $data["pwd_hash"];
 		$this->surname = $data["surname"];
@@ -61,7 +85,6 @@ class User
 		$this->year = $data["year"];
 		$this->confirm_email = $data["confirm_email"];
 		$this->forgotten_password = $data["forgotten_password"];
-
 	}
 
 	public function getEmail()
@@ -73,7 +96,7 @@ class User
 	{
 		global $DB;
 		$this->email = $email;
-		$DB->prepare("UPDATE `users` SET `email` = ?, WHERE `id` = ?;")->execute([$email, $this->getId()]);
+		$DB->prepare("UPDATE `users` SET `email` = ? WHERE `id` = ?;")->execute([$email, $this->getId()]);
 	}
 
 	public function getId()
@@ -95,7 +118,7 @@ class User
 	{
 		global $DB;
 		$this->pwd_hash = $password_hash;
-		$DB->prepare("UPDATE `users` SET `pwd_hash` = ?, WHERE `id` = ?;")->execute([$password_hash, $this->getId()]);
+		$DB->prepare("UPDATE `users` SET `pwd_hash` = ? WHERE `id` = ?;")->execute([$password_hash, $this->getId()]);
 	}
 
 	public function getSurname()
@@ -107,7 +130,7 @@ class User
 	{
 		global $DB;
 		$this->surname = $surname;
-		$DB->prepare("UPDATE `users` SET `surname` = ?, WHERE `id` = ?;")->execute([$surname, $this->getId()]);
+		$DB->prepare("UPDATE `users` SET `surname` = ? WHERE `id` = ?;")->execute([$surname, $this->getId()]);
 	}
 
 	public function getFirstName()
@@ -119,7 +142,7 @@ class User
 	{
 		global $DB;
 		$this->first_name = $first_name;
-		$DB->prepare("UPDATE `users` SET `first_name` = ?, WHERE `id` = ?;")->execute([$first_name, $this->getId()]);
+		$DB->prepare("UPDATE `users` SET `first_name` = ? WHERE `id` = ?;")->execute([$first_name, $this->getId()]);
 	}
 
 	public function getBirthDate()
@@ -131,7 +154,7 @@ class User
 	{
 		global $DB;
 		$this->birth_date = $birth_date;
-		$DB->prepare("UPDATE `users` SET `birth_date` = ?, WHERE `id` = ?;")->execute([$birth_date, $this->getId()]);
+		$DB->prepare("UPDATE `users` SET `birth_date` = ? WHERE `id` = ?;")->execute([$birth_date, $this->getId()]);
 	}
 
 	public function getGender()
@@ -143,7 +166,7 @@ class User
 	{
 		global $DB;
 		$this->gender = $gender;
-		$DB->prepare("UPDATE `users` SET `email` = ?, WHERE `id` = ?;")->execute([$gender, $this->getId()]);
+		$DB->prepare("UPDATE `users` SET `email` = ? WHERE `id` = ?;")->execute([$gender, $this->getId()]);
 	}
 
 	public function getAddress()
@@ -155,7 +178,7 @@ class User
 	{
 		global $DB;
 		$this->address = $address;
-		$DB->prepare("UPDATE `users` SET `address` = ?, WHERE `id` = ?;")->execute([$address, $this->getId()]);
+		$DB->prepare("UPDATE `users` SET `address` = ? WHERE `id` = ?;")->execute([$address, $this->getId()]);
 	}
 
 	public function getPostalCode()
@@ -167,7 +190,7 @@ class User
 	{
 		global $DB;
 		$this->postal_code = $postal_code;
-		$DB->prepare("UPDATE `users` SET `postal_code` = ?, WHERE `id` = ?;")->execute([$postal_code, $this->getId()]);
+		$DB->prepare("UPDATE `users` SET `postal_code` = ? WHERE `id` = ?;")->execute([$postal_code, $this->getId()]);
 	}
 
 	public function getCity()
@@ -179,7 +202,7 @@ class User
 	{
 		global $DB;
 		$this->city = $city;
-		$DB->prepare("UPDATE `users` SET `city` = ?, WHERE `id` = ?;")->execute([$city, $this->getId()]);
+		$DB->prepare("UPDATE `users` SET `city` = ? WHERE `id` = ?;")->execute([$city, $this->getId()]);
 	}
 
 	public function getCountry()
@@ -191,7 +214,7 @@ class User
 	{
 		global $DB;
 		$this->country = $country;
-		$DB->prepare("UPDATE `users` SET `country` = ?, WHERE `id` = ?;")->execute([$country, $this->getId()]);
+		$DB->prepare("UPDATE `users` SET `country` = ? WHERE `id` = ?;")->execute([$country, $this->getId()]);
 	}
 
 	public function getPhoneNumber()
@@ -203,7 +226,7 @@ class User
 	{
 		global $DB;
 		$this->phone_number = $phone_number;
-		$DB->prepare("UPDATE `users` SET `phone_number` = ?, WHERE `id` = ?;")->execute([$phone_number, $this->getId()]);
+		$DB->prepare("UPDATE `users` SET `phone_number` = ? WHERE `id` = ?;")->execute([$phone_number, $this->getId()]);
 	}
 
 	public function getSchool()
@@ -215,7 +238,7 @@ class User
 	{
 		global $DB;
 		$this->school = $school;
-		$DB->prepare("UPDATE `users` SET `school` = ?, WHERE `id` = ?;")->execute([$school, $this->getId()]);
+		$DB->prepare("UPDATE `users` SET `school` = ? WHERE `id` = ?;")->execute([$school, $this->getId()]);
 	}
 
 	public function getClass()
@@ -227,7 +250,7 @@ class User
 	{
 		global $DB;
 		$this->class = $class;
-		$DB->prepare("UPDATE `users` SET `class` = ?, WHERE `id` = ?;")->execute([$class, $this->getId()]);
+		$DB->prepare("UPDATE `users` SET `class` = ? WHERE `id` = ?;")->execute([$class, $this->getId()]);
 	}
 
 	public function getResponsibleName()
@@ -239,7 +262,7 @@ class User
 	{
 		global $DB;
 		$this->responsible_name = $responsible_name;
-		$DB->prepare("UPDATE `users` SET `responsible_name` = ?, WHERE `id` = ?;")->execute([$responsible_name, $this->getId()]);
+		$DB->prepare("UPDATE `users` SET `responsible_name` = ? WHERE `id` = ?;")->execute([$responsible_name, $this->getId()]);
 	}
 
 	public function getResponsiblePhone()
@@ -251,7 +274,7 @@ class User
 	{
 		global $DB;
 		$this->responsible_phone = $responsible_phone;
-		$DB->prepare("UPDATE `users` SET `responsible_phone` = ?, WHERE `id` = ?;")->execute([$responsible_phone, $this->getId()]);
+		$DB->prepare("UPDATE `users` SET `responsible_phone` = ? WHERE `id` = ?;")->execute([$responsible_phone, $this->getId()]);
 	}
 
 	public function getResponsibleEmail()
@@ -263,7 +286,7 @@ class User
 	{
 		global $DB;
 		$this->responsible_email = $responsible_email;
-		$DB->prepare("UPDATE `users` SET `responsible_email` = ?, WHERE `id` = ?;")->execute([$responsible_email, $this->getId()]);
+		$DB->prepare("UPDATE `users` SET `responsible_email` = ? WHERE `id` = ?;")->execute([$responsible_email, $this->getId()]);
 	}
 
 	public function getDescription()
@@ -275,7 +298,7 @@ class User
 	{
 		global $DB;
 		$this->description = $desc;
-		$DB->prepare("UPDATE `users` SET `description` = ?, WHERE `id` = ?;")->execute([$desc, $this->getId()]);
+		$DB->prepare("UPDATE `users` SET `description` = ? WHERE `id` = ?;")->execute([$desc, $this->getId()]);
 	}
 
 	public function getRole()
@@ -288,7 +311,7 @@ class User
 		global $DB;
 		$this->role = $role;
 		/** @noinspection PhpUndefinedMethodInspection */
-		$DB->prepare("UPDATE `users` SET `email` = ?, WHERE `id` = ?;")->execute([$role->getName(), $this->getId()]);
+		$DB->prepare("UPDATE `users` SET `email` = ? WHERE `id` = ?;")->execute([$role->getName(), $this->getId()]);
 	}
 
 	public function getTeamId()
@@ -300,7 +323,7 @@ class User
 	{
 		global $DB;
 		$this->team_id = $team_id;
-		$DB->prepare("UPDATE `users` SET `team_id` = ?, WHERE `id` = ?;")->execute([$team_id, $this->getId()]);
+		$DB->prepare("UPDATE `users` SET `team_id` = ? WHERE `id` = ?;")->execute([$team_id, $this->getId()]);
 	}
 
 	public function getYear()
@@ -317,7 +340,7 @@ class User
 	{
 		global $DB;
 		$this->confirm_email = $token;
-		$DB->prepare("UPDATE `users` SET `confirm_email` = ?, WHERE `id` = ?;")->execute([$token, $this->getId()]);
+		$DB->prepare("UPDATE `users` SET `confirm_email` = ? WHERE `id` = ?;")->execute([$token, $this->getId()]);
 	}
 
 	public function getForgottenPasswordToken()
@@ -329,6 +352,6 @@ class User
 	{
 		global $DB;
 		$this->forgotten_password = $token;
-		$DB->prepare("UPDATE `users` SET `forgotten_password` = ?, WHERE `id` = ?;")->execute([$token, $this->getId()]);
+		$DB->prepare("UPDATE `users` SET `forgotten_password` = ? WHERE `id` = ?;")->execute([$token, $this->getId()]);
 	}
 }
\ No newline at end of file