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34 from sqlalchemy import Table, Column, MetaData
35 from sqlalchemy.types import BigInteger
36 from sqlalchemy.sql import select
37 from sqlalchemy.exc import NoSuchTableError
39 from dbworker import DBWorker
41 def create_tables(engine):
44 columns.append(Column('serial', BigInteger, primary_key=True))
45 config = Table('qh_sync', metadata, *columns, mysql_engine='InnoDB')
47 metadata.create_all(engine)
48 return metadata.sorted_tables
50 class QuotaholderSync(DBWorker):
51 """QuotaholderSync are entries for syncing with quota holder.
54 def __init__(self, **params):
55 DBWorker.__init__(self, **params)
57 metadata = MetaData(self.engine)
58 self.qh_sync = Table('qh_sync', metadata, autoload=True)
59 except NoSuchTableError:
60 tables = create_tables(self.engine)
61 map(lambda t: self.__setattr__(t.name, t), tables)
63 def get_lower(self, serial):
64 """Return entries lower than serial."""
66 s = select([self.qh_sync.c.serial])
67 s = s.where(self.qh_sync.c.serial < serial)
68 r = self.conn.execute(s)
73 def insert_serial(self, serial):
77 s = self.qh_sync.insert()
78 r = self.conn.execute(s, serial=serial)
79 inserted_primary_key = r.inserted_primary_key[0]
81 return inserted_primary_key