diff --git a/server/db/database.py b/server/db/database.py
index b79cf2e..c3d68da 100644
--- a/server/db/database.py
+++ b/server/db/database.py
@@ -1,13 +1,14 @@
 from pymongo import MongoClient
-from .get_db import find_one, get_games, get_users
-from .add_db import add_game, add_user
-
+from .get_db import *
+from .add_db import *
+from .imp_exp import save_db, restore_db
 
 class Database:
   def __init__(self, connection_str, db_name):
     self.db = MongoClient(connection_str).get_database(db_name)
     self.game_id = 1
     self.user_id = 1
+    self.event_id = 1
 
   def users_list(self):
     return get_users(self.db)
@@ -17,7 +18,7 @@ def games_list(self):
 
   def register_game(self, team_info):
     host = team_info["admin"]
-    host.update({"id": self.user_id, "game_id":self.game_id, "is_host": True})
+    host.update({"id": self.user_id, "game_id": self.game_id, "is_host": True})
     add_user(self.db, host)
     self.user_id += 1
 
@@ -43,3 +44,27 @@ def get_user(self, user_id):
 
   def get_game(self, game_id):
     return find_one("games", self.db, game_id)
+
+  def export_db(self, file_name):
+    return save_db(self.db, file_name)
+
+  def import_db(self, import_json):
+    max_ids = (1, 1, 1)
+    try:
+      max_ids = restore_db(self.db, import_json)
+    except ValueError:
+      print("синтаксически неверный JSON")
+      return False
+    self.user_id, self.game_id, self.event_id = max_ids
+
+  def search_host(self, fields):
+    return search_host_w_fields(self.db, fields)
+
+  def search_player(self, fields):
+    return search_player_w_fields(self.db, fields)
+
+  def search_game(self, fields):
+    return search_games_w_fields(self.db, fields)
+
+  def search_event(self, fields):
+    return search_events_w_fields(self.db, fields)
diff --git a/server/db/get_db.py b/server/db/get_db.py
index 8dbdad0..fa9ead8 100644
--- a/server/db/get_db.py
+++ b/server/db/get_db.py
@@ -42,4 +42,25 @@ def game_full_info(db, game_id):
   host = users_coll.find_one({"game_id": game_id, "is_host": True})
   return {"admin_name": host["name"], "players_num": players_num, "form_num": status_count["form"],
           "accepted_cheques" :accepted_cheques, "not_accepted_cheques": not_accepted_cheques,
-          "sent_gifts": status_count["sent"], "got_gifts": got_gifts }
\ No newline at end of file
+          "sent_gifts": status_count["sent"], "got_gifts": got_gifts }
+
+
+def search_player_w_fields(db, fields):
+  documents = db["users"]
+  results = documents.find({"branch": {"$eq": "CSE"}}, {"branch": {"$exists": True}})
+  return results
+
+def search_host_w_fields(db, fields):
+  documents = db["users"]
+  results = documents.find({"branch": {"$eq": "CSE"}}, {"branch": {"$exists": True}})
+  return results
+
+def search_games_w_fields(db, fields):
+  documents = db["games"]
+  results = documents.find({"branch": {"$eq": "CSE"}}, {"branch": {"$exists": True}})
+  return results
+
+def search_events_w_fields(db, fields):
+  documents = db["events"]
+  results = documents.find({"branch": {"$eq": "CSE"}}, {"branch": {"$exists": True}})
+  return results
\ No newline at end of file
diff --git a/server/db/imp_exp.py b/server/db/imp_exp.py
new file mode 100644
index 0000000..5407a52
--- /dev/null
+++ b/server/db/imp_exp.py
@@ -0,0 +1,38 @@
+from bson.json_util import dumps
+import json
+
+def save_db(db, filename="dump.json"):
+    collections = db.collection_names()
+    db_dump_str = "{"
+    delim = ""
+    for i, collection_name in enumerate(collections):
+      col = getattr(db, collections[i])
+      collection = col.find()
+      db_dump_str += delim + "{\"" + collection_name + "\":["
+      db_dump_str += dumps(collection) + "]"
+      delim = ","
+
+    db_dump_str += "}"
+    try:
+      with open(filename, 'wb') as jsonfile:
+        jsonfile.write(str.encode(db_dump_str))
+    except (IOError, OSError):
+      print("ошибка записи")
+      return False
+    except (FileNotFoundError, PermissionError, OSError):
+      print("ошибка открытия файла")
+      return False
+
+    return True
+
+
+def restore_db(db, import_json):
+    json_colls = json.loads(import_json)
+    for col_name in json_colls:
+        col = db[col_name]
+        col.insert_many(json_colls[col_name])
+    max_uid = len(json_colls["users"]) + 1
+    max_gid = len(json_colls["games"]) + 1
+    max_eid = len(json_colls["events"]) + 1
+
+    return max_uid, max_gid, max_eid
\ No newline at end of file