'Returns database block with the lowest sequence number higher than the block\'s sequence_number
:param block: The block who\'s successor we want to find
:return A block'

def get_block_after(self, block):

    return self._get(u'WHERE    sequence_number    >    ?    AND    public_key    =    ?    ORDER    BY    sequence_number    ASC', (block.sequence_number, buffer(block.public_key)))
