所以我正在尝试使用cdecimal在我的数据库中存储货币值。 SQLAlchemy Doc
import sys
import cdecimal
sys.modules["decimal"] = cdecimal
我已经连接了我的PostgreSQL数据库,如下所示:
sqlalchemy.url = postgresql+psycopg2://user:password@host:port/dbname
我已经设置了这样的模型:
class Exchange(Base):
amount = Column(Numeric)
...
def __init__(self, amount):
self.amount = cdecimal.Decimal(amount)
但是,每当我这样做时,都会收到以下错误:
ProgrammingError: (ProgrammingError) can't adapt type 'cdecimal.Decimal' 'INSERT INTO...
我做错了什么?
答案 0 :(得分:7)
这个适合我,请试试这个
import sys
import cdecimal
sys.modules["decimal"] = cdecimal
from sqlalchemy import create_engine, Numeric, Integer, Column
from sqlalchemy.ext.declarative import declarative_base
engine = create_engine('mysql://test:test@localhost/test1')
Base = declarative_base()
class Exchange(Base):
__tablename__ = 'exchange'
id = Column(Integer, primary_key=True)
amount = Column(Numeric(10,2))
def __init__(self, amount):
self.amount = cdecimal.Decimal(amount)
Base.metadata.create_all(engine)
from sqlalchemy.orm import sessionmaker
Session = sessionmaker(bind=engine)
session = Session()
x = Exchange(10.5)
session.add(x)
session.commit()
注意:我的电脑里没有pgsql所以我试过mysql。