设置SQLAlchemy自动增量起始值

from sqlalchemy import create_engine, Column, Integer, String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker

Base = declarative_base()

class User(Base):
    __tablename__ = 'users'
    id = Column(Integer, primary_key=True, autoincrement=True, start=1000)
    name = Column(String)

engine = create_engine('sqlite:///example.db')
Base.metadata.create_all(engine)

Session = sessionmaker(bind=engine)
session = Session()

new_user = User(name='Alice')
session.add(new_user)
session.commit()

print(new_user.id)  # 输出可能是 1001，取决于数据库的自动增量行为

try:
    new_user = User(name='Alice')
    session.add(new_user)
    session.commit()
except Exception as e:
    print(f"Error: {e}")
    session.rollback()

from sqlalchemy import create_engine

engine = create_engine('sqlite:///example.db', connect_args={'isolation_level': 'IMMEDIATE'})