diff --git a/WebService/pom.xml b/WebService/pom.xml
index dbbd774..acc5c27 100644
--- a/WebService/pom.xml
+++ b/WebService/pom.xml
@@ -26,6 +26,10 @@
 			<artifactId>spring-boot-starter-test</artifactId>
 			<scope>test</scope>
 		</dependency>
+		<dependency>
+			<groupId>org.springframework.data</groupId>
+			<artifactId>spring-data-jpa</artifactId>
+		</dependency>
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-hateoas</artifactId>
diff --git a/WebService/src/main/java/SAE/ApiREST/WebService/controller/TeacherController.java b/WebService/src/main/java/SAE/ApiREST/WebService/controller/TeacherController.java
index 548cfbe..8515812 100644
--- a/WebService/src/main/java/SAE/ApiREST/WebService/controller/TeacherController.java
+++ b/WebService/src/main/java/SAE/ApiREST/WebService/controller/TeacherController.java
@@ -102,3 +102,4 @@ public class TeacherController {
                 linkTo(methodOn(TeacherController.class).getAllTeacher()).withRel("all"));
     }
 }
+//Todo() linkto dans service.
\ No newline at end of file
diff --git a/WebService/src/main/java/SAE/ApiREST/WebService/repository/ITeacherRepository.java b/WebService/src/main/java/SAE/ApiREST/WebService/repository/ITeacherRepository.java
new file mode 100644
index 0000000..508a18d
--- /dev/null
+++ b/WebService/src/main/java/SAE/ApiREST/WebService/repository/ITeacherRepository.java
@@ -0,0 +1,18 @@
+package SAE.ApiREST.WebService.repository;
+
+import SAE.ApiREST.WebService.model.Teacher;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+
+@Repository
+public interface ITeacherRepository extends JpaRepository< Teacher, Integer> {
+
+
+    Teacher findByUsername(String username);
+
+    Teacher findByMail(String mail);
+
+    Teacher findByDate(String date);
+}
diff --git a/WebService/src/main/java/SAE/ApiREST/WebService/service/TeacherService.java b/WebService/src/main/java/SAE/ApiREST/WebService/service/TeacherService.java
new file mode 100644
index 0000000..f4ef135
--- /dev/null
+++ b/WebService/src/main/java/SAE/ApiREST/WebService/service/TeacherService.java
@@ -0,0 +1,71 @@
+package SAE.ApiREST.WebService.service;
+
+import SAE.ApiREST.WebService.Response;
+import SAE.ApiREST.WebService.model.Teacher;
+import SAE.ApiREST.WebService.repository.ITeacherRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Service
+public class TeacherService implements ITeacherService {
+
+    @Autowired
+    private final ITeacherRepository teachRep;
+
+    public TeacherService(ITeacherRepository teachRep) {
+        this.teachRep = teachRep;
+    }
+
+
+    @Override
+    public List<Teacher> getAllTeacher() {
+        return teachRep.findAll();
+    }
+
+    @Override
+    public Teacher getTeacherById(Integer id) {
+        return teachRep.getReferenceById(id);
+    }
+
+    @Override
+    public Teacher getTeacherByUsername(String username) {
+        return teachRep.findByUsername(username);
+    }
+
+    @Override
+    public Teacher getTeacherByMail(String mail) {
+        return teachRep.findByMail(mail);
+    }
+
+    @Override
+    public Teacher getTeacherByDate(String date) {
+        return teachRep.findByDate(date);
+    }
+
+    @Override
+    public List<Teacher> addTeacher(Teacher t) {
+        List<Teacher> lT = getAllTeacher();
+        lT.add(t);
+        return lT;
+    }
+
+    @Override
+    public List<Teacher> deleteTeacher(Integer id) {
+        List<Teacher> lT = getAllTeacher();
+        lT.remove(getTeacherById(id));
+        return lT;
+    }
+
+    @Override
+    public Response modifyUsername(Teacher t, String newUsername) {
+        t.setUsername(newUsername);
+        return new Response(t.getId(), String.format("Username changed for {id}", t.getId()));
+    }
+}
+
+
+
+
+