diff --git a/src/ExercicesTP/CRUD/EtudiantDAO.java b/src/ExercicesTP/CRUD/EtudiantDAO.java
index dedb71b..a4c663e 100644
--- a/src/ExercicesTP/CRUD/EtudiantDAO.java
+++ b/src/ExercicesTP/CRUD/EtudiantDAO.java
@@ -1,30 +1,110 @@
 package ExercicesTP.CRUD;
+import ExercicesTP.Config;
 import ExercicesTP.Etudiant;
 import ExercicesTP.interfaces.EtudiantDaoCRUD;
+import TP_Base.MyConnexion;
+
+import java.sql.*;
+
 public class EtudiantDAO implements EtudiantDaoCRUD{
 
+    Connection con = null;
+    Statement st = null;
+    public EtudiantDAO() {
+        con = MyConnexion.getConnection(Config.URL, Config.USERNAME, Config.PASSWORD);
+        try {
+            st = con.createStatement();
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
     @Override
     public void addEtudiant(Etudiant etudiant) {
-
+        PreparedStatement ps = null;
+        try {
+            ps = con.prepareStatement("INSERT INTO etudiant (id,nom, prenom, filiere, niveau, groupe) VALUES (?,?,?,?,?,?)");
+            ps.setInt(1, etudiant.getId());
+            ps.setString(2, etudiant.getNom());
+            ps.setString(3, etudiant.getPrenom());
+            ps.setString(4, etudiant.getFiliere());
+            ps.setInt(5, etudiant.getNiveau());
+            ps.setInt(6, etudiant.getGroupe());
+            ps.executeUpdate();
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
     }
 
     @Override
     public void deleteEtudiant(int id) {
-
+        PreparedStatement ps = null;
+        try {
+            ps = con.prepareStatement("DELETE FROM etudiant WHERE id = ?");
+            ps.setInt(1, id);
+            ps.executeUpdate();
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
     }
 
     @Override
     public void updateEtudiant(Etudiant etudiant) {
-
+        PreparedStatement ps = null;
+        try {
+            ps = con.prepareStatement("UPDATE etudiant SET nom = ?, prenom = ?, filiere = ?, niveau = ?, groupe = ? WHERE id = ?");
+            ps.setString(1, etudiant.getNom());
+            ps.setString(2, etudiant.getPrenom());
+            ps.setString(3, etudiant.getFiliere());
+            ps.setInt(4, etudiant.getNiveau());
+            ps.setInt(5, etudiant.getGroupe());
+            ps.setInt(6, etudiant.getId());
+            ps.executeUpdate();
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
     }
 
     @Override
     public Etudiant getEtudiant(int id) {
-        return null;
+        PreparedStatement ps = null;
+        try {
+            ps = con.prepareStatement("SELECT * FROM etudiant WHERE id = ?");
+            ps.setInt(1, id);
+            ResultSet rs = ps.executeQuery();
+            if (rs.next()) {
+                return new Etudiant(rs.getInt("id"), rs.getString("nom"), rs.getString("prenom"), rs.getString("filiere"), rs.getInt("niveau"), rs.getInt("groupe"));
+            }else{
+                return null;
+            }
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
     }
 
     @Override
     public Etudiant[] getAllEtudiants() {
-        return new Etudiant[0];
+        try {
+            ResultSet rs = st.executeQuery("SELECT * FROM etudiant");
+            Etudiant[] etudiants = new Etudiant[getRowCount(rs)];
+            int i = 0;
+            while (rs.next()) {
+                etudiants[i] = new Etudiant(rs.getInt("id"), rs.getString("nom"), rs.getString("prenom"), rs.getString("filiere"), rs.getInt("niveau"), rs.getInt("groupe"));
+                i++;
+            }
+            return etudiants;
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private int getRowCount(ResultSet rs) {
+        try {
+            int rowCount = 0;
+            while(rs.next())
+                rowCount++;
+            return rowCount;
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
     }
 }