Python 尝试迁移数据库时出错(slalchemy,slqite3)
我有下一个models.py文件:Python 尝试迁移数据库时出错(slalchemy,slqite3),python,sqlite,flask,sqlalchemy,alembic,Python,Sqlite,Flask,Sqlalchemy,Alembic,我有下一个models.py文件: from app import db, bcrypt from sqlalchemy import ForeignKey from sqlalchemy.orm import relationship class BlogPost(db.Model): __tablename__ = "posts" id = db.Column(db.Integer, primary_key=True) title = db.Column(db
from app import db, bcrypt
from sqlalchemy import ForeignKey
from sqlalchemy.orm import relationship
class BlogPost(db.Model):
__tablename__ = "posts"
id = db.Column(db.Integer, primary_key=True)
title = db.Column(db.String, nullable=False)
desc = db.Column(db.String, nullable=False)
author_id = db.Column(db.Integer, ForeignKey('users.id'))
def __init__(self, title, desc):
self.title = title
self.desc = desc
def __repr__(self):
return "Titulo >> " + self.title
class User(db.Model):
__tablename__ = 'users'
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String, nullable=False)
email = db.Column(db.String, nullable=False)
password = db.Column(db.String, nullable=False)
posts = relationship("BlogPost", backref="author")
def __init__(self, name, email, password):
self.name = name
self.email = email
self.password = password
def __repr__(self):
return "Usuario >> ", self.name
然后我跑:
python manage.py db init
python manage.py db migrate
一切都很好,问题是当我试图修改我的模型文件进行迁移时。。我只是换句话:
self.password = password
致:
当我跑的时候:
python manage.py db init
python manage.py db migrate
它可以工作,但当我尝试升级时:
python manage.py db upgrade
我得到下一个错误:
"No support for ALTER of constraints in SQLite dialect")
NotImplementedError: No support for ALTER of constraints in SQLite dialect
注意:数据库只有一些用于测试的记录。。谢谢大家! 自从Alembic的大多数教程编写以来,Alembic已经改变了SQLite迁移的方式<现在需要使用code>ALTER命令。如果以后决定从SQLite切换,此模式仍然与其他数据库兼容 对于要更改的每个表,将所有操作放在带有op.batch\u alter\u table('table\u name'):块的
中
def upgrade():
with op.batch_alter_table('table_name'):
op.alter_column(...)