code: def fix_config(self, options):
          
          opt = "db_url"
          if opt not in options:
              options[opt] = "jdbc:mysql://somehost:3306/somedatabase"
          if opt not in self.help:
              self.help[opt] = "The JDBC database URL to connect to (str)."
  
          opt = "user"
          if opt not in options:
              options[opt] = "user"
          if opt not in self.help:
              self.help[opt] = "The database user to use for connecting (str)."
  
          opt = "password"
          if opt not in options:
              options[opt] = "secret"
          if opt not in self.help:
              self.help[opt] = "The password for the database user (str)."
  
          opt = "query"
          if opt not in options:
              options[opt] = "SELECT * FROM table"
          if opt not in self.help:
              self.help[opt] = "The SQL query for generating the dataset (str)."
  
          opt = "sparse"
          if opt not in options:
              options[opt] = False
          if opt not in self.help:
              self.help[opt] = "Whether to return the data in sparse format (bool)."
  
          opt = "custom_props"
          if opt not in options:
              options[opt] = ""
          if opt not in self.help:
              self.help[opt] = "Custom properties filename (str)."
  
          return super(LoadDatabase, self).fix_config(options)
docs: Fixes the options, if necessary. I.e., it adds all required elements to the dictionary.
  
          :param options: the options to fix
          :type options: dict
          :return: the (potentially) fixed options
          :rtype: dict