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我是Sqlalchemy的新手。 我有列USERNAME中的多个键的表。 这就是我在模型中所做的。sqlalchemy ORM:如何声明一个包含多个键的表类?
型号:
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql://[email protected]/admin'
db = SQLAlchemy(app)
class RADUSAGE(db.Model):
__tablename__ = 'RADUSAGE'
USERNAME = db.Column(db.String(513))
AGE = db.Column(db.Integer)
def __init__(self, USERNAME, AGE):
self.USERNAME = USERNAME
self.AGE = AGE
def __repr__(self):
return '<RADUSAGE %r>' % self.USERNAME
但我得到了一个错误:
File "/Users/admin/rad_env/lib/python2.7/site-packages/sqlalchemy/ext/declarative/base.py", line 530, in map
**self.mapper_args
File "<string>", line 2, in mapper
File "/Users/admin/rad_env/lib/python2.7/site-packages/sqlalchemy/orm/mapper.py", line 677, in __init__
self._configure_pks()
File "/Users/admin/rad_env/lib/python2.7/site-packages/sqlalchemy/orm/mapper.py", line 1277, in _configure_pks
(self, self.mapped_table.description))
sqlalchemy.exc.ArgumentError: Mapper Mapper|RADUSAGE|RADUSAGE could not assemble any primary key columns for mapped table 'RADUSAGE'
我如何可以声明包含SQLAlchemy的多个关键这个表类?希望可以有人帮帮我。提前致谢。
你是指复合主键?还是多个独特的约束? – univerio
我的意思是,多列键是列是非唯一索引的第一列,其中列中允许多个出现的给定值。 (https://dev.mysql.com/doc/refman/5.7/en/show-columns.html) – RunawayBride
那么只是一个普通的索引?你做了什么没有奏效? – univerio