多用户加外键
role_id=db.Column(db.Integer,db.ForeignKey('roles.id'))
一方角色加关系映射
users=db.relationship('Users',backref='roles')
from flaskimport Flask
from flask_scriptimport Manager
from flask_sqlalchemyimport SQLAlchemy
from flask_migrateimport Migrate,MigrateCommand
app=Flask(__name__)
manager=Manager(app)
db=SQLAlchemy(app)
migrate=Migrate(app,db)
manager.add_command('db',MigrateCommand)
class Config(object):
DEBUG=True
SQLALCHEMY_DATABASE_URI='mysql://root:root@localhost:3306/flask01'
SQLALCHEMY_TRACK_MODIFICATIONS=True
SQLALCHEMY_COMMIT_ON_TEAR=True
SQLALCHEMY_ECHO=True
app.config.from_object(Config)
class Roles(db.Model):
__tablename__='roles'
id=db.Column(db.Integer,autoincrement=True,primary_key=True)
name=db.Column(db.String(20),nullable=False)
info=db.Column(db.String(50))
users=db.relationship('Users',backref='roles')
def __init__(self,name,info):
self.name=name
self.info=info
def __str__(self):
return "name * %s info * %s" %self.name,self.info
class Users(db.Model):
__tablename__='usrs'
id=db.Column(db.Integer,autoincrement=True,primary_key=True)
name=db.Column(db.String(50),nullable=False)
pwd=db.Column(db.String(20),nullable=False)
role_id=db.Column(db.Integer,db.ForeignKey('roles.id'))
def __init__(self,name,pwd,role_id):
self.name=name
self.pwd=pwd
self.role_id=role_id
@app.route('/')
def index():
return '
使用manager扩展命令来迁移数据库
'
if __name__ =='__main__':
manager.run()
控制台显示
(first_flask) D:\Flask项目设计\review_first>python apps.py db init
D:\python\first_flask\lib\site-packages\flask_sqlalchemy\__init__.py:812: UserWarning: Neither SQ
LALCHEMY_DATABASE_URI nor SQLALCHEMY_BINDS is set. Defaulting SQLALCHEMY_DATABASE_URI to "sqlite:
///:memory:".
warnings.warn(
D:\python\first_flask\lib\site-packages\flask_sqlalchemy\__init__.py:833: FSADeprecationWarning:
SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in the f
uture. Set it to True or False to suppress this warning.
warnings.warn(FSADeprecationWarning(
Creating directory D:\Flask项目设计\review_first\migrations ... done
Creating directory D:\Flask项目设计\review_first\migrations\versions ... done
Generating D:\Flask项目设计\review_first\migrations\alembic.ini ... done
Generating D:\Flask项目设计\review_first\migrations\env.py ... done
Generating D:\Flask项目设计\review_first\migrations\README ... done
Generating D:\Flask项目设计\review_first\migrations\script.py.mako ... done
Please edit configuration/connection/logging settings in 'D:\\Flask项目设计\\review_first\\migrat
ions\\alembic.ini' before proceeding.
(first_flask) D:\Flask项目设计\review_first>python apps.py db migrate
D:\python\first_flask\lib\site-packages\flask_sqlalchemy\__init__.py:812: UserWarning: Neither SQ
LALCHEMY_DATABASE_URI nor SQLALCHEMY_BINDS is set. Defaulting SQLALCHEMY_DATABASE_URI to "sqlite:
///:memory:".
warnings.warn(
D:\python\first_flask\lib\site-packages\flask_sqlalchemy\__init__.py:833: FSADeprecationWarning:
SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in the f
uture. Set it to True or False to suppress this warning.
warnings.warn(FSADeprecationWarning(
INFO [alembic.runtime.migration] Context impl MySQLImpl.
INFO [alembic.runtime.migration] Will assume non-transactional DDL.
INFO [alembic.autogenerate.compare] Detected added table 'roles'
Generating D:\Flask项目设计\review_first\migrations\versions\2ce58beca98f_.py ... done
(first_flask) D:\Flask项目设计\review_first>python apps.py db upgrade
D:\python\first_flask\lib\site-packages\flask_sqlalchemy\__init__.py:812: UserWarning: Neither SQ
LALCHEMY_DATABASE_URI nor SQLALCHEMY_BINDS is set. Defaulting SQLALCHEMY_DATABASE_URI to "sqlite:
///:memory:".
(first_flask) D:\Flask项目设计\review_first>python apps.py db migrate
D:\python\first_flask\lib\site-packages\flask_sqlalchemy\__init__.py:812: UserWarning: Neither SQ
LALCHEMY_DATABASE_URI nor SQLALCHEMY_BINDS is set. Defaulting SQLALCHEMY_DATABASE_URI to "sqlite:
///:memory:".
warnings.warn(
D:\python\first_flask\lib\site-packages\flask_sqlalchemy\__init__.py:833: FSADeprecationWarning:
SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in the f
uture. Set it to True or False to suppress this warning.
warnings.warn(FSADeprecationWarning(
INFO [alembic.runtime.migration] Context impl MySQLImpl.
INFO [alembic.runtime.migration] Will assume non-transactional DDL.
INFO [alembic.autogenerate.compare] Detected added column 'roles.info'
Generating D:\Flask项目设计\review_first\migrations\versions\51108d4647a0_.py ... done
(first_flask) D:\Flask项目设计\review_first>python apps.py db upgrade
D:\python\first_flask\lib\site-packages\flask_sqlalchemy\__init__.py:812: UserWarning: Neither SQ
LALCHEMY_DATABASE_URI nor SQLALCHEMY_BINDS is set. Defaulting SQLALCHEMY_DATABASE_URI to "sqlite:
///:memory:".
warnings.warn(
D:\python\first_flask\lib\site-packages\flask_sqlalchemy\__init__.py:833: FSADeprecationWarning:
SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in the f
uture. Set it to True or False to suppress this warning.
warnings.warn(FSADeprecationWarning(
INFO [alembic.runtime.migration] Context impl MySQLImpl.
(first_flask) D:\Flask项目设计\review_first>python apps.py db migrate
D:\python\first_flask\lib\site-packages\flask_sqlalchemy\__init__.py:812: UserWarning: Neither SQ
LALCHEMY_DATABASE_URI nor SQLALCHEMY_BINDS is set. Defaulting SQLALCHEMY_DATABASE_URI to "sqlite:
///:memory:".
warnings.warn(
D:\python\first_flask\lib\site-packages\flask_sqlalchemy\__init__.py:833: FSADeprecationWarning:
SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in the f
uture. Set it to True or False to suppress this warning.
warnings.warn(FSADeprecationWarning(
INFO [alembic.runtime.migration] Context impl MySQLImpl.
INFO [alembic.runtime.migration] Will assume non-transactional DDL.
INFO [alembic.autogenerate.compare] Detected added table 'usrs'
Generating D:\Flask项目设计\review_first\migrations\versions\f042b5b9b41c_.py ... done
(first_flask) D:\Flask项目设计\review_first>python apps.py db upgrade
D:\python\first_flask\lib\site-packages\flask_sqlalchemy\__init__.py:812: UserWarning: Neither SQL
SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in the f
uture. Set it to True or False to suppress this warning.
warnings.warn(FSADeprecationWarning(
INFO [alembic.runtime.migration] Context impl MySQLImpl.
INFO [alembic.runtime.migration] Will assume non-transactional DDL.
INFO [alembic.runtime.migration] Running upgrade 51108d4647a0 -> f042b5b9b41c, empty message