code: public <T> T functionOnDatabase(DbFunction<T> dbFunction) {
  		SQLiteDatabase db = getDatabaseConnection();
  		try {
  			return dbFunction.apply(db);
  		} finally {
  			reduceDatabaseConnection();
  		}
  	}
docs: Execute a function on the database, to return some values. The opening and closing of the database connection is handled for you.<br>
  Note if you want to query a cursor from the database consider using the {@code DbCreator#query} or {@code DbCreator#rawQuery} method.<br>
  This can be useful when working with {@code CursorAdapter}
  
  @param <T>        Resulting type
  @param dbFunction Function you want to execute on the database
  @return The result of the function call