Small fixes

Author: balins

server/src/main/java/com/balinski/api_project/database/dao/Dao.java

@@ -19,6 +19,14 @@ public int getCount() throws DaoException {
         return ((Long)result.get(0).get("COUNT")).intValue();
     }
 
+    public int getMaxId() throws DaoException {
+        List<Map<String, Object>> result = DaoManager.getData(
+                String.format("SELECT MAX(%s_ID) AS ID FROM %s;", type.toString(), type.toString())
+        );
+
+        return result.size() > 0 ? (int)result.get(0).get("ID") : 0;
+    }
+
     public List<T> getById(int id) throws DaoException {
         List<Map<String, Object>> result = DaoManager.getData(
                     String.format("SELECT * FROM %s T WHERE T.%s_ID = %d;", type.toString(), type.toString(), id)

server/src/main/java/com/balinski/api_project/servlet/AddUserServlet.java

@@ -49,7 +49,7 @@ public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOExc
             if(limit < 0)
                 throw new DaoException("Limit can not be a negative number.");
 
-            int newId = DaoManager.getUserDao().getCount()+1;
+            int newId = DaoManager.getUserDao().getMaxId()+1;
             User user = new User(newId, name, sha256(name), 0, limit, LocalDateTime.now(), LocalDateTime.now());
             DaoManager.getUserDao().add(user);
 

server/src/main/java/com/balinski/api_project/servlet/UserServlet.java

@@ -18,6 +18,8 @@ public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOExc
         PrintWriter writer = resp.getWriter();
 
         try {
+            int newId = DaoManager.getUserDao().getMaxId()+1;
+            System.out.println(newId);
             List<User> users = DaoManager.getUserDao().getAll();
             String response = JsonResponseBuilder.mergeFromList(users);
             writer.print(response);