diff --git a/persistence/src/main/java/fr/gasser/daoexample/DummyConnection.java b/persistence/src/main/java/fr/gasser/daoexample/DummyConnection.java
deleted file mode 100644
index 3f72644..0000000
--- a/persistence/src/main/java/fr/gasser/daoexample/DummyConnection.java
+++ /dev/null
@@ -1,5 +0,0 @@
-package fr.gasser.daoexample;
-
-public class DummyConnection {
-
-}
diff --git a/persistence/src/main/java/fr/gasser/daoexample/dao/Dao.java b/persistence/src/main/java/fr/gasser/daoexample/dao/Dao.java
index 5e262f5..fe3b9fe 100644
--- a/persistence/src/main/java/fr/gasser/daoexample/dao/Dao.java
+++ b/persistence/src/main/java/fr/gasser/daoexample/dao/Dao.java
@@ -1,15 +1,15 @@
 package fr.gasser.daoexample.dao;
 
-import fr.gasser.daoexample.DummyConnection;
 import fr.gasser.daoexample.model.Entity;
+import fr.gasser.daoexample.sql.Connection;
 
 import java.util.List;
 
 public abstract class Dao<T extends Entity> {
 
-    protected DummyConnection connection;
+    protected Connection connection;
 
-    public Dao(DummyConnection connection) {
+    public Dao(Connection connection) {
         this.connection = connection;
     }
 
diff --git a/persistence/src/main/java/fr/gasser/daoexample/dao/DaoFactory.java b/persistence/src/main/java/fr/gasser/daoexample/dao/DaoFactory.java
index c258b5d..606f263 100644
--- a/persistence/src/main/java/fr/gasser/daoexample/dao/DaoFactory.java
+++ b/persistence/src/main/java/fr/gasser/daoexample/dao/DaoFactory.java
@@ -1,9 +1,10 @@
 package fr.gasser.daoexample.dao;
 
-import fr.gasser.daoexample.DummyConnection;
+import fr.gasser.daoexample.sql.Connection;
+import fr.gasser.daoexample.sql.DummyConnection;
 
 public class DaoFactory implements DaoAbstractFactory {
-    private static DummyConnection connection = new DummyConnection();
+    private static Connection connection = new DummyConnection();
 
     @Override
     public StudentDao createStudentDao() {
diff --git a/persistence/src/main/java/fr/gasser/daoexample/dao/DisciplineDao.java b/persistence/src/main/java/fr/gasser/daoexample/dao/DisciplineDao.java
index fc52a23..61ac979 100644
--- a/persistence/src/main/java/fr/gasser/daoexample/dao/DisciplineDao.java
+++ b/persistence/src/main/java/fr/gasser/daoexample/dao/DisciplineDao.java
@@ -1,7 +1,7 @@
 package fr.gasser.daoexample.dao;
 
-import fr.gasser.daoexample.DummyConnection;
 import fr.gasser.daoexample.model.Discipline;
+import fr.gasser.daoexample.sql.Connection;
 
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -16,7 +16,7 @@ public class DisciplineDao extends Dao<Discipline> {
             new Discipline(2, "Qsdf")
     ));
 
-    public DisciplineDao(DummyConnection connection) {
+    public DisciplineDao(Connection connection) {
         super(connection);
     }
 
diff --git a/persistence/src/main/java/fr/gasser/daoexample/dao/StudentDao.java b/persistence/src/main/java/fr/gasser/daoexample/dao/StudentDao.java
index 3df5427..34b0c5c 100644
--- a/persistence/src/main/java/fr/gasser/daoexample/dao/StudentDao.java
+++ b/persistence/src/main/java/fr/gasser/daoexample/dao/StudentDao.java
@@ -1,7 +1,7 @@
 package fr.gasser.daoexample.dao;
 
-import fr.gasser.daoexample.DummyConnection;
 import fr.gasser.daoexample.model.Student;
+import fr.gasser.daoexample.sql.Connection;
 
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -16,7 +16,7 @@ public class StudentDao extends Dao<Student> {
             new Student(2, "Qsdf", "Jklm"))
     );
 
-    StudentDao(DummyConnection connection) {
+    StudentDao(Connection connection) {
         super(connection);
     }
 
diff --git a/persistence/src/main/java/fr/gasser/daoexample/dao/TeacherDao.java b/persistence/src/main/java/fr/gasser/daoexample/dao/TeacherDao.java
index c10b644..8becfa0 100644
--- a/persistence/src/main/java/fr/gasser/daoexample/dao/TeacherDao.java
+++ b/persistence/src/main/java/fr/gasser/daoexample/dao/TeacherDao.java
@@ -1,7 +1,7 @@
 package fr.gasser.daoexample.dao;
 
-import fr.gasser.daoexample.DummyConnection;
 import fr.gasser.daoexample.model.Teacher;
+import fr.gasser.daoexample.sql.Connection;
 
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -16,7 +16,7 @@ public class TeacherDao extends Dao<Teacher> {
             new Teacher(2, "Sit", "Amet"))
     );
 
-    TeacherDao(DummyConnection connection) {
+    TeacherDao(Connection connection) {
         super(connection);
     }
 
diff --git a/persistence/src/main/java/fr/gasser/daoexample/sql/Connection.java b/persistence/src/main/java/fr/gasser/daoexample/sql/Connection.java
new file mode 100644
index 0000000..36ac760
--- /dev/null
+++ b/persistence/src/main/java/fr/gasser/daoexample/sql/Connection.java
@@ -0,0 +1,9 @@
+package fr.gasser.daoexample.sql;
+
+public interface Connection {
+    void connect();
+
+    void close();
+
+    java.sql.Connection getConnection();
+}
diff --git a/persistence/src/main/java/fr/gasser/daoexample/sql/DummyConnection.java b/persistence/src/main/java/fr/gasser/daoexample/sql/DummyConnection.java
new file mode 100644
index 0000000..936647e
--- /dev/null
+++ b/persistence/src/main/java/fr/gasser/daoexample/sql/DummyConnection.java
@@ -0,0 +1,18 @@
+package fr.gasser.daoexample.sql;
+
+public class DummyConnection implements Connection {
+    @Override
+    public void connect() {
+
+    }
+
+    @Override
+    public void close() {
+
+    }
+
+    @Override
+    public java.sql.Connection getConnection() {
+        return null;
+    }
+}