python数据库操作之sqlalchemy逆向工程

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依赖安装

pip install sqlacodegen

数据库配置config.py

import os

from sqlalchemy import create_engine
from sqlalchemy.engine import Engine
from sqlalchemy.orm import declarative_base, sessionmaker, Session

HOST = 'localhost'
PORT = 3306
USERNAME = 'root'
PASSWORD = 'root'
DB = 'demo'

DB_URI = f'mysql+pymysql://{USERNAME}:{PASSWORD}@{HOST}:{PORT}/{DB}'

# 自动生成models
os.system(f'sqlacodegen {DB_URI} > models.py')

# 操作数据句柄
engine: Engine = create_engine(DB_URI)
Base = declarative_base(engine)
session: Session = sessionmaker(engine)()

右键运行config.py,会在当前目录生成models.py模型文件如下，该文件最好不要改动，后面数据库表改动的话，直接重新生成就好。

# coding: utf-8
from sqlalchemy import Column, DateTime, Integer, SmallInteger, String, TIMESTAMP, text
from sqlalchemy.dialects.mysql import TINYINT, VARCHAR
from sqlalchemy.ext.declarative import declarative_base

Base = declarative_base()
metadata = Base.metadata


class Admin(Base):
    __tablename__ = 'admin'

    id = Column(Integer, primary_key=True)
    name = Column(String(50))
    password = Column(String(50))
    status = Column(Integer)
    create_time = Column(DateTime)
    update_time = Column(DateTime)


class AdminRole(Base):
    __tablename__ = 'admin_role'

    id = Column(Integer, primary_key=True)
    user_id = Column(Integer, nullable=False, comment='用户id')
    role_id = Column(Integer, nullable=False, comment='角色id')
    create_time = Column(TIMESTAMP, nullable=False, server_default=text("CURRENT_TIMESTAMP"), comment='创建时间')

操作数据库

from orm.config import session
from orm.models import Admin


session.add(Admin(name='张三丰', password='123456', status=1))
session.commit()
# 查询数据
admin__all = session.query(Admin.id).all()
print(admin__all)