Question

我正在尝试使用sqlalchemy的反射功能但遇到问题。

这是我想要反映的 mysql表。

| Country | CREATE TABLE `Country` (
  `Code` varchar(8) NOT NULL,
  `Country` varchar(64) NOT NULL,
  `IsValid` varchar(1) DEFAULT 'Y',
  PRIMARY KEY (`Code`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |

反映代码（sch.py）。

from sqlalchemy.ext.declarative import declarative_base
import sqlalchemy
import eng

#Base = sqlalchemy.ext.declarative.declarative_base()
Base = declarative_base()

country = Table('Country',eng.Meta,autoload=True)
class Country(Base):    
    __tablename__ = country
    __mapper_args = {
        'primary_key' : [country.c.Code]
    }

eng.py

import sqlalchemy
import sqlalchemy.orm

eng = sqlalchemy.create_engine('mysql://user:pass@host/db',echo=True)

Meta = sqlalchemy.MetaData()
Meta.bind = eng

sesDec = sqlalchemy.orm.sessionmaker(bind=eng)

当我import sch我收到错误时。

import sqlalchemy
from sch import Country
import eng

ses = eng.sesDec()

res = ses.query(Country.Code.label('Code'),Country.Country.label('Country'))

for rec in res.filter(Country.IsValid == 'Y').filter(Country.Code.like('A%')).order_by(Country.Code).all():
    print rec

错误（堆栈跟踪底部）

  File "/pythonlib/lib64/python2.4/site-packages/sqlalchemy/sql/expression.py", line 4198, in description
    return self.name.encode('ascii', 'backslashreplace')
AttributeError: 'Table' object has no attribute 'encode

Answer 1

class Country(Base):    
    __tablename__ = country

您的意思是__table__ = country吗？

数据库反射在sqlalchemy中抛出错误

1 个答案: