Hi all,
I'm using SqlAlchemy 0.5rc2 on a Windows Server 2003 system and I've got
a question about re-creating objects from a database. I'm building a
Windows Service using Python and the win32all modules and using SA to
save the state machine data for each of the Job objects I'm tracking in
a collection class. The Job objects look like this:
class Job(srsmanagerdb.Base):
__tablename__ = "jobs"
id = Column(Integer, primary_key=True,
autoincrement=True)
created = Column(DateTime, default=None)
job_id = Column(String(32), default=None)
srcpath = Column(String(128), default=None)
filesize = Column(Integer, default=None)
productType = Column(String(1), default=None)
contentType = Column(String(10), default=None)
priorityType = Column(String(10), default=None)
priority = Column(Integer, default=None)
press = Column(Integer, default=None)
assignedPress = Column(Integer, default=None)
state = Column(Integer, default=None)
scheduled = Column(Boolean, default=None)
def __init__(self, srcpath=None):
'''constructor - initializes the instance variables.
'''
self._config = __config__
self._logger = __logger__
self._fileops = __fileops__
self.srcpath = srcpath
self.filesize = os.stat(self.srcpath).st_size
self.created =
datetime.datetime.fromtimestamp(os.stat(self.srcpath).st_ctime)
self.state = 0
self.oldState = None
self.stateSS = singleshot.SingleShot()
self._pressesStatus = PressesStatus()
session = srsmanagerdb.Session()
session.add(self)
session.commit()
self._logger.debug("job %s added" % self.filename)
I've got attributes that are saved in the database and some that aren't
(the ones that have _ prefix). If my server crashes I'd like it to read
the database and rebuild my collection class of Job objects. I do this
in the collection class constructor, and it works fine, but it doesn't
restore the atttributes that aren't in the database, the _ prefixed
ones. Does anyone have any suggestions about what is a good method to
re-create a collection of objects that are represented in a table that
also have attributes that aren't stored in the table?
Thanks in advance,
Doug
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