def get record, keys
      resource = record.new(keys)
      execute(record, command_get(record), *resource.tuple.values_at(*record.header.keys)).first
    end
def get record, keys
      resource = record.new(keys)
      execute(record, command_get(record), *resource.tuple.values_at(*record.header.keys)).first
    end
Select by id(s).

 @example Single key.
   Swift.db.get(User, id: 12)
 @example Complex primary key.
   Swift.db.get(UserAddress, user_id: 12, address_id: 15)

 @param  [Swift::Record] record Concrete record subclass to load.
 @param  [Hash]          keys   Hash of id(s) <tt>{id_name: value}</tt>.
 @return [Swift::Record, nil]
 @see    Swift::Record.get
--
 NOTE: Not significantly shorter than Record.db.first(User, 'id = ?', 12)