2009/3/19 Andreas Jung <[email protected]>: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On 19.03.2009 5:24 Uhr, 一首诗 wrote: >> This is my ORM class definition: >> >> #========================= >> class User(Base): >> __tablename__ = 'b_taa_user' >> >> user_id = Column(Integer, primary_key=True, autoincrement=True, >> nullable=False) # 用户ID >> user_name = Column(Unicode(255), unique=True, nullable=False, >> server_default="") # 用户名称 >> user_password = Column(Unicode(255), nullable=False, >> server_default="") # 用户密码 >> email = Column(Unicode(255), nullable=False, server_default="") # 邮 >> 箱 >> mobile = Column(Unicode(255), nullable=False, server_default="") # >> 手机 >> phone = Column(Unicode(255), nullable=False, server_default="") # 电 >> 话 >> >> def __init__(self, user_name = ""): >> self.user_name = username >> #========================= >> >> I made some debug by the code below: >> >> #========================= >> >> #!/usr/bin/python >> >> import xmlrpclib >> from blf.model import User >> >> u = User('333') >> s = xmlrpclib.dumps((u,), methodresponse=True, allow_none=True) >> print s >> #========================= >> >> Finally, I found that the first problem is : xmlrpclib only serialize >> type *instance*. >> But to my surprise, when I check type of u, it's a *class* object. >> Don't know why ... >> >> > > Sending mapped instances over XMLRPC is basically nonsense. XMLRPC is > designed for transporting elementary datatypes over the wire in order to > invoke a remote method. It is not designed for sending instances of some > class and not for sending Python pickles. No idea what you are trying to > accomplish. Consider converting a mapped instance to dict and sending > this dict serialized in JSON format to a remote XMLRPC server.
SQLAlchemy needs a concept of Data Transfer Objects so that it can be easily transmitted and reconstituted as necessary and everyone doesn't have to reimplemented the idea themselves. There are many cases where one might want to transfer a model from a data source on a server side to a client, and vice verse. -- Fedora 9 : sulphur is good for the skin ( www.pembo13.com ) --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
