code: def load_aead(self, public_id):
          
          connection = self.engine.connect()
          trans = connection.begin()
  
          try:
              s = sqlalchemy.select([self.aead_table]).where(
                  (self.aead_table.c.public_id == public_id)
                  & self.aead_table.c.keyhandle.in_([kh[1] for kh in self.key_handles]))
              result = connection.execute(s)
  
              for row in result:
                  kh_int = row['keyhandle']
                  aead = pyhsm.aead_cmd.YHSM_GeneratedAEAD(None, kh_int, '')
                  aead.data = row['aead']
                  aead.nonce = row['nonce']
              return aead
          except Exception as e:
              trans.rollback()
              raise Exception("No AEAD in DB for public_id %s (%s)" % (public_id, str(e)))
          finally:
              connection.close()
docs: Loads AEAD from the specified database.