update DAO with theme

src/main/java/DAO/QuizzDAO.java

@@ -1,5 +1,6 @@
 package DAO;
 
+import jakarta.persistence.EntityTransaction;
 import metier.Quizz;
 
 public class QuizzDAO extends  GenericDAOImpl<Integer, Quizz>{
@@ -7,4 +8,11 @@ public class QuizzDAO extends  GenericDAOImpl<Integer, Quizz>{
         super();
         this.setClass(Quizz.class);
     }
+
+    public void deleteAllQuiz(){
+        EntityTransaction et= em.getTransaction();
+        et.begin();
+        em.createQuery("delete from Quizz").executeUpdate();
+        et.commit();
+    }
 }

src/main/java/DAO/SessionDAO.java

@@ -1,12 +1,29 @@
 package DAO;
 
 
+import jakarta.persistence.EntityTransaction;
+import jakarta.persistence.Query;
 import metier.Session;
 
+import java.util.List;
+
 public class SessionDAO extends GenericDAOImpl<Integer, Session> {
     public SessionDAO() {
         super();
         this.setClass(Session.class);
     }
 
+    public List<Session> findByTheme(String theme){
+        EntityTransaction t=em.getTransaction();
+        t.begin();
+        Query query=em.createQuery("select s from Session s where s.theme=:theme");
+        query.setParameter("theme",theme);
+        List<Session> sessions=query.getResultList();
+        t.commit();
+        if(sessions.size()>0){
+            return sessions;
+        }else{
+            return null;
+        }
+    }
 }

src/main/java/metier/Session.java

@@ -10,6 +10,7 @@ public class Session implements Serializable {
     private int codePIN;
     private ArrayList<Quizz> quizzs;
     private ArrayList<Utilisateur> utilisateurs;
+    private String theme;
 
     public Session(){
     }
@@ -41,4 +42,12 @@ public class Session implements Serializable {
     public ArrayList<Utilisateur> getUtilisateurs() {
         return this.utilisateurs;
     }
+
+    private String getTheme(){
+        return this.theme;
+    }
+
+    private void setTheme(String theme){
+        this.theme = theme;
+    }
 }