diff --git a/osm_common/dbmemory.py b/osm_common/dbmemory.py
index c2d9a11..c994640 100644
--- a/osm_common/dbmemory.py
+++ b/osm_common/dbmemory.py
@@ -17,6 +17,7 @@
 
 import logging
 from osm_common.dbbase import DbException, DbBase
+from osm_common.dbmongo import deep_update
 from http import HTTPStatus
 from uuid import uuid4
 from copy import deepcopy
@@ -44,16 +45,102 @@
 
     @staticmethod
     def _format_filter(q_filter):
-        return q_filter    # TODO
+        db_filter = {}
+        # split keys with ANYINDEX in this way:
+        # {"A.B.ANYINDEX.C.D.ANYINDEX.E": v }  -> {"A.B.ANYINDEX": {"C.D.ANYINDEX": {"E": v}}}
+        if q_filter:
+            for k, v in q_filter.items():
+                db_v = v
+                kleft, _, kright = k.rpartition(".ANYINDEX.")
+                while kleft:
+                    k = kleft + ".ANYINDEX"
+                    db_v = {kright: db_v}
+                    kleft, _, kright = k.rpartition(".ANYINDEX.")
+                deep_update(db_filter, {k: db_v})
+
+        return db_filter
 
     def _find(self, table, q_filter):
+
+        def recursive_find(key_list, key_next_index, content, operator, target):
+            if key_next_index == len(key_list) or content is None:
+                try:
+                    if operator == "eq":
+                        if isinstance(target, list) and not isinstance(content, list):
+                            return True if content in target else False
+                        return True if content == target else False
+                    elif operator in ("neq", "ne"):
+                        if isinstance(target, list) and not isinstance(content, list):
+                            return True if content not in target else False
+                        return True if content != target else False
+                    if operator == "gt":
+                        return content > target
+                    elif operator == "gte":
+                        return content >= target
+                    elif operator == "lt":
+                        return content < target
+                    elif operator == "lte":
+                        return content <= target
+                    elif operator == "cont":
+                        return content in target
+                    elif operator == "ncont":
+                        return content not in target
+                    else:
+                        raise DbException("Unknown filter operator '{}' in key '{}'".
+                                          format(operator, ".".join(key_list)), http_code=HTTPStatus.BAD_REQUEST)
+                except TypeError:
+                    return False
+
+            elif isinstance(content, dict):
+                return recursive_find(key_list, key_next_index+1, content.get(key_list[key_next_index]), operator,
+                                      target)
+            elif isinstance(content, list):
+                look_for_match = True  # when there is a match return immediately
+                if (target is None and operator not in ("neq", "ne")) or \
+                        (target is not None and operator in ("neq", "ne")):
+                    look_for_match = False  # when there is a match return immediately
+
+                for content_item in content:
+                    if key_list[key_next_index] == "ANYINDEX" and isinstance(v, dict):
+                        for k2, v2 in target.items():
+                            k_new_list = k2.split(".")
+                            new_operator = "eq"
+                            if k_new_list[-1] in ("eq", "ne", "gt", "gte", "lt", "lte", "cont", "ncont", "neq"):
+                                new_operator = k_new_list.pop()
+                            if not recursive_find(k_new_list, 0, content_item, new_operator, v2):
+                                match = False
+                                break
+                        else:
+                            match = True
+
+                    else:
+                        match = recursive_find(key_list, key_next_index, content_item, operator, target)
+                    if match == look_for_match:
+                        return match
+                if key_list[key_next_index].isdecimal() and int(key_list[key_next_index]) < len(content):
+                    match = recursive_find(key_list, key_next_index+1, content[int(key_list[key_next_index])],
+                                           operator, target)
+                    if match == look_for_match:
+                        return match
+                return not look_for_match
+            else:  # content is not dict, nor list neither None, so not found
+                if operator in ("neq", "ne"):
+                    return True if target is None else False
+                else:
+                    return True if target is None else False
+
         for i, row in enumerate(self.db.get(table, ())):
-            match = True
-            if q_filter:
-                for k, v in q_filter.items():
-                    if k not in row or v != row[k]:
-                        match = False
-            if match:
+            q_filter = q_filter or {}
+            for k, v in q_filter.items():
+                k_list = k.split(".")
+                operator = "eq"
+                if k_list[-1] in ("eq", "ne", "gt", "gte", "lt", "lte", "cont", "ncont", "neq"):
+                    operator = k_list.pop()
+                match = recursive_find(k_list, 0, row, operator, v)
+                if not match:
+                    break
+            else:
+                # match
                 yield i, row
 
     def get_list(self, table, q_filter=None):
@@ -144,6 +231,59 @@
         except Exception as e:  # TODO refine
             raise DbException(str(e))
 
+    def set_one(self, table, q_filter, update_dict, fail_on_empty=True, unset=None, pull=None, push=None):
+        """
+        Modifies an entry at database
+        :param table: collection or table
+        :param q_filter: Filter
+        :param update_dict: Plain dictionary with the content to be updated. It is a dot separated keys and a value
+        :param fail_on_empty: If nothing matches filter it returns None unless this flag is set tu True, in which case
+        it raises a DbException
+        :param unset: Plain dictionary with the content to be removed if exist. It is a dot separated keys, value is
+                      ignored. If not exist, it is ignored
+        :param pull: Plain dictionary with the content to be removed from an array. It is a dot separated keys and value
+                     if exist in the array is removed. If not exist, it is ignored
+        :param push: Plain dictionary with the content to be appended to an array. It is a dot separated keys and value
+                     is appended to the end of the array
+        :return: Dict with the number of entries modified. None if no matching is found.
+        """
+        try:
+            with self.lock:
+                for i, db_item in self._find(table, self._format_filter(q_filter)):
+                    break
+                else:
+                    if fail_on_empty:
+                        raise DbException("Not found entry with _id='{}'".format(q_filter), HTTPStatus.NOT_FOUND)
+                    return None
+                for k, v in update_dict.items():
+                    db_nested = db_item
+                    k_list = k.split(".")
+                    k_nested_prev = k_list[0]
+                    for k_nested in k_list[1:]:
+                        if isinstance(db_nested[k_nested_prev], dict):
+                            if k_nested not in db_nested[k_nested_prev]:
+                                db_nested[k_nested_prev][k_nested] = None
+                        elif isinstance(db_nested[k_nested_prev], list) and k_nested.isdigit():
+                            # extend list with Nones if index greater than list
+                            k_nested = int(k_nested)
+                            if k_nested >= len(db_nested[k_nested_prev]):
+                                db_nested[k_nested_prev] += [None] * (k_nested - len(db_nested[k_nested_prev]) + 1)
+                        elif db_nested[k_nested_prev] is None:
+                            db_nested[k_nested_prev] = {k_nested: None}
+                        else:  # number, string, boolean, ... or list but with not integer key
+                            raise DbException("Cannot set '{}' on existing '{}={}'".format(k, k_nested_prev,
+                                                                                           db_nested[k_nested_prev]))
+
+                        db_nested = db_nested[k_nested_prev]
+                        k_nested_prev = k_nested
+
+                    db_nested[k_nested_prev] = v
+                return {"updated": 1}
+        except DbException:
+            raise
+        except Exception as e:  # TODO refine
+            raise DbException(str(e))
+
     def replace(self, table, _id, indata, fail_on_empty=True):
         """
         Replace the content of an entry
@@ -189,6 +329,29 @@
         except Exception as e:  # TODO refine
             raise DbException(str(e))
 
+    def create_list(self, table, indata_list):
+        """
+        Add a new entry at database
+        :param table: collection or table
+        :param indata_list: list content to be added
+        :return: database ids of the inserted element. Raises a DbException on error
+        """
+        try:
+            _ids = []
+            for indata in indata_list:
+                _id = indata.get("_id")
+                if not _id:
+                    _id = str(uuid4())
+                    indata["_id"] = _id
+                with self.lock:
+                    if table not in self.db:
+                        self.db[table] = []
+                    self.db[table].append(deepcopy(indata))
+                _ids.append(_id)
+            return _ids
+        except Exception as e:  # TODO refine
+            raise DbException(str(e))
+
 
 if __name__ == '__main__':
     # some test code