diff --git a/db.cpp b/db.cpp
index 0cf4220..af6b890 100644
--- a/db.cpp
+++ b/db.cpp
@@ -1,143 +1,32 @@
 #include "db.h"
-#include <sqlite3.h>
-#include <iostream>
 #include <fstream>
+#include <iostream>
 
-sqlite3* db = nullptr;
-
-// --- Connexion / fermeture ---
-bool openDB(const std::string& filename) {
-    int rc = sqlite3_open(filename.c_str(), &db);
-    if(rc) {
-        std::cerr << "Impossible d'ouvrir la base : " << sqlite3_errmsg(db) << "\n";
-        return false;
-    }
-    return true;
-}
-
-void closeDB() {
-    if(db) sqlite3_close(db);
-}
-
-// --- Authentification ---
-int loginUser(const std::string& login, const std::string& password) {
-    sqlite3_stmt* stmt;
-    std::string sql = "SELECT id, role FROM users WHERE login=? AND password=?";
-    sqlite3_prepare_v2(db, sql.c_str(), -1, &stmt, nullptr);
-    sqlite3_bind_text(stmt, 1, login.c_str(), -1, SQLITE_STATIC);
-    sqlite3_bind_text(stmt, 2, password.c_str(), -1, SQLITE_STATIC);
-
-    int role = -1;
-    int rc = sqlite3_step(stmt);
-    if(rc == SQLITE_ROW) {
-        role = sqlite3_column_int(stmt, 1); // 0=ADMIN, 1=PROF, 2=STUDENT
-    }
-    sqlite3_finalize(stmt);
-    return role;
-}
-
-// --- Étudiants ---
-std::vector<Student> getAllStudents() {
-    std::vector<Student> list;
-    sqlite3_stmt* stmt;
-    std::string sql = "SELECT s.id, s.nom, n.note1, n.note2, n.note3 FROM students s JOIN notes n ON s.id=n.student_id";
-    sqlite3_prepare_v2(db, sql.c_str(), -1, &stmt, nullptr);
-
-    while(sqlite3_step(stmt) == SQLITE_ROW) {
-        Student s;
-        s.id = sqlite3_column_int(stmt, 0);
-        s.nom = reinterpret_cast<const char*>(sqlite3_column_text(stmt, 1));
-        s.notes[0] = sqlite3_column_int(stmt, 2);
-        s.notes[1] = sqlite3_column_int(stmt, 3);
-        s.notes[2] = sqlite3_column_int(stmt, 4);
-        list.push_back(s);
-    }
-    sqlite3_finalize(stmt);
-    return list;
-}
-
-Student getStudentByLogin(const std::string& login) {
-    Student s;
-    sqlite3_stmt* stmt;
-    std::string sql = "SELECT s.id, s.nom, n.note1, n.note2, n.note3 FROM students s JOIN notes n ON s.id=n.student_id WHERE s.nom=?";
-    sqlite3_prepare_v2(db, sql.c_str(), -1, &stmt, nullptr);
-    sqlite3_bind_text(stmt, 1, login.c_str(), -1, SQLITE_STATIC);
-
-    if(sqlite3_step(stmt) == SQLITE_ROW){
-        s.id = sqlite3_column_int(stmt, 0);
-        s.nom = reinterpret_cast<const char*>(sqlite3_column_text(stmt, 1));
-        s.notes[0] = sqlite3_column_int(stmt, 2);
-        s.notes[1] = sqlite3_column_int(stmt, 3);
-        s.notes[2] = sqlite3_column_int(stmt, 4);
-    }
-    sqlite3_finalize(stmt);
-    return s;
-}
-
-// --- Modifier une note ---
-bool updateNote(int studentId, int noteIndex, int newNote) {
-    std::string col = "note" + std::to_string(noteIndex+1);
-    std::string sql = "UPDATE notes SET " + col + "=? WHERE student_id=?";
-    sqlite3_stmt* stmt;
-    sqlite3_prepare_v2(db, sql.c_str(), -1, &stmt, nullptr);
-    sqlite3_bind_int(stmt, 1, newNote);
-    sqlite3_bind_int(stmt, 2, studentId);
-
-    int rc = sqlite3_step(stmt);
-    sqlite3_finalize(stmt);
-    return rc == SQLITE_DONE;
-}
-
-// --- Export / Import ---
-bool exportData(const std::string& filename, const std::string& role, const std::string& login) {
+bool exportData(const std::string& filename, const std::vector<Student>& students) {
     std::ofstream file(filename);
     if(!file.is_open()) return false;
 
-    std::vector<Student> list;
-    if(role == "ADMIN" || role == "PROF") list = getAllStudents();
-    else list.push_back(getStudentByLogin(login));
-
-    for(auto& s : list){
+    for(auto& s : students){
         file << s.nom << " " << s.notes[0] << " " << s.notes[1] << " " << s.notes[2] << "\n";
     }
     file.close();
     return true;
 }
 
-bool importData(const std::string& filename, const std::string& role) {
-    if(role == "STUDENT") return false; // pas autorisé
-
+bool importData(const std::string& filename, std::vector<Student>& students) {
     std::ifstream file(filename);
     if(!file.is_open()) return false;
 
     std::string nom;
     int n1,n2,n3;
-    while(file >> nom >> n1 >> n2 >> n3){
-        if(role == "ADMIN"){
-            // chercher étudiant
-            sqlite3_stmt* stmt;
-            std::string sql = "UPDATE notes SET note1=?, note2=?, note3=? WHERE student_id=(SELECT id FROM students WHERE nom=?)";
-            sqlite3_prepare_v2(db, sql.c_str(), -1, &stmt, nullptr);
-            sqlite3_bind_int(stmt, 1, n1);
-            sqlite3_bind_int(stmt, 2, n2);
-            sqlite3_bind_int(stmt, 3, n3);
-            sqlite3_bind_text(stmt, 4, nom.c_str(), -1, SQLITE_STATIC);
-            sqlite3_step(stmt);
-            sqlite3_finalize(stmt);
-        } else if(role == "PROF"){
-            // modification notes seulement
-            sqlite3_stmt* stmt;
-            std::string sql = "UPDATE notes SET note1=?, note2=?, note3=? WHERE student_id=(SELECT id FROM students WHERE nom=?)";
-            sqlite3_prepare_v2(db, sql.c_str(), -1, &stmt, nullptr);
-            sqlite3_bind_int(stmt, 1, n1);
-            sqlite3_bind_int(stmt, 2, n2);
-            sqlite3_bind_int(stmt, 3, n3);
-            sqlite3_bind_text(stmt, 4, nom.c_str(), -1, SQLITE_STATIC);
-            sqlite3_step(stmt);
-            sqlite3_finalize(stmt);
-        }
+    int i = 0;
+    while(file >> nom >> n1 >> n2 >> n3 && i < students.size()){
+        students[i].nom = nom;
+        students[i].notes[0] = n1;
+        students[i].notes[1] = n2;
+        students[i].notes[2] = n3;
+        i++;
     }
-
     file.close();
     return true;
 }
\ No newline at end of file