Added automatic module delete

+ small Changes

backend/src/main/java/com/example/backend/anwprj/DataBaseHandler.java

@@ -312,6 +312,8 @@ public class DataBaseHandler
     {
         try
         {
+            st.executeUpdate("DELETE FROM module WHERE semesterId = " + id);
+
             st.executeUpdate("delete from semester where id=" + id);
         }
         catch(Exception e)
@@ -344,10 +346,10 @@ public class DataBaseHandler
      MODULE
      */
 
-    //get a semester object by its name
+    //get a module object by its name
     public Module getModule(String name) {
         try {
-            ResultSet rs = st.executeQuery("SELECT * FROM SEMESTER WHERE name = '" + name + "'");
+            ResultSet rs = st.executeQuery("SELECT * FROM modules WHERE name = '" + name + "'");
             return resultSetToModule(rs);
         }
         catch (Exception ex){
@@ -355,10 +357,10 @@ public class DataBaseHandler
         }
     }
 
-    //get a semester object by its id
+    //get a module object by its id
     public Module getModule(int id) {
         try {
-            ResultSet rs = st.executeQuery("SELECT * FROM Module WHERE id=" + id);
+            ResultSet rs = st.executeQuery("SELECT * FROM modules WHERE id=" + id);
             return  resultSetToModule(rs);
         }
         catch (Exception ex) {
@@ -369,7 +371,7 @@ public class DataBaseHandler
     public Module addModule(Module m)
     {
         try {
-            st.executeUpdate("INSERT INTO Module (lecturerId, semesterId, name) " +
+            st.executeUpdate("INSERT INTO modules (lecturerId, semesterId, name) " +
                     "Values (" + m.getLecturerId() + m.getSemesterId() + m.getName() + ")");
             return getModule(m.getId());
 
@@ -382,7 +384,7 @@ public class DataBaseHandler
     public Module[] getAllModules() {
         try
         {
-            ResultSet rs = st.executeQuery("SELECT * FROM semester");
+            ResultSet rs = st.executeQuery("SELECT * FROM modules");
             List<Module> moduleList = new ArrayList<>();
             Module m = null;
             while((m = resultSetToModule(rs)) != null)
@@ -401,7 +403,7 @@ public class DataBaseHandler
     public Module updateModule(Module m)
     {
         try {
-            st.executeUpdate("UPDATE module SET lecturerId=" + m.getLecturerId() + ", " +
+            st.executeUpdate("UPDATE modules SET lecturerId=" + m.getLecturerId() + ", " +
                     "semesterId=" + m.getSemesterId() + ", " +
                     "name='" + m.getName() + "'");
             return getModule(m.getId());
@@ -415,7 +417,7 @@ public class DataBaseHandler
     public boolean deleteModule(int id)
     {
         try {
-            st.executeUpdate("DELETE FROM module WHERE id=" + id);
+            st.executeUpdate("DELETE FROM modules WHERE id=" + id);
             return true;
         }
         catch(Exception ex) {
@@ -583,6 +585,11 @@ public class DataBaseHandler
     {
         try
         {
+            ResultSet rs = st.executeQuery("SELECT id FROM user WHERE mail='" + mail + "'");
+            rs.next();
+            int id = rs.getInt("id");
+            st.executeUpdate("DELETE FROM modules WHERE lecturerId = " + id);
+
             st.executeUpdate("delete from users where mail='" + mail + "'");
             return true;
         }

backend/src/main/java/com/example/backend/anwprj/controller/ModuleController.java

@@ -2,7 +2,6 @@ package com.example.backend.anwprj.controller;
 
 import com.example.backend.anwprj.DataBaseHandler;
 import com.example.backend.anwprj.Module.Module;
-import com.example.backend.anwprj.Semesters.Semester;
 import com.example.backend.anwprj.Users.User;
 import com.example.backend.anwprj.Users.UserPermissions;
 import com.example.backend.anwprj.Users.UserSessionIDHandler;
@@ -73,6 +72,24 @@ public class ModuleController {
         return null;
     }
 
+    @CrossOrigin
+    @PostMapping("/module")
+    public ResponseEntity<Module> addModule(@RequestBody Module module, @RequestParam(name="sessionid") String sessionID) {
+        User user = UserSessionIDHandler.getUserBySessionID(sessionID);
+
+        if(user.getPermissions() == UserPermissions.admin.getValue()) {
+            Module m = db.addModule(module);
+            if(m != null) {
+                return new ResponseEntity<>(m, HttpStatus.OK);
+            }
+
+            return new ResponseEntity<>(HttpStatus.NOT_FOUND);
+        }
+
+
+        return new ResponseEntity<>(HttpStatus.FORBIDDEN);
+    }
+
     @CrossOrigin
     @PutMapping("/module")
     public ResponseEntity<Module> updateModule(@RequestBody Module module, @RequestParam(name="sessionid") String sessionID) {