sqlalchemy实例

【核心代码】

#!/usr/bin/env python
# -*- coding: utf-8 -*-
#-------------------------------------------------------------------------------
# Name:         sqlalchemy_test02
# Purpose:
#
# Author:       longc
# Created:      2019/2/12
# IDE:          PyCharm
# Copyright:   (c) longc 2019
# Licence:     <your licence>
# Version:     <your version>
#-------------------------------------------------------------------------------
import pymysql
pymysql.install_as_MySQLdb()

import random
from faker import Factory

from sqlalchemy import create_engine, Table
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import ForeignKey
from sqlalchemy import Column, String, Integer, Text
from sqlalchemy.orm import sessionmaker, relationship


engine = create_engine('mysql mysqldb://root:123456@192.168.38.128:3306/blog_test?charset=utf8')
Base = declarative_base()


class User(Base):

    __tablename__ = 'users'

    id = Column(Integer, primary_key=True)
    username = Column(String(64), nullable=False, index=True)
    password = Column(String(64), nullable=False)
    email = Column(String(64), nullable=False, index=True)
    articles = relationship('Article', backref='author')
    userinfo = relationship('UserInfo', backref='user', uselist=False)

    def __repr__(self):
        return '%s(%r)' % (self.__class__.__name__, self.username)


class UserInfo(Base):

    __tablename__ = 'userinfos'

    id = Column(Integer, primary_key=True)
    name = Column(String(64))
    qq = Column(String(11))
    phone = Column(String(11))
    link = Column(String(64))
    user_id = Column(Integer, ForeignKey('users.id'))

    def __repr__(self):
        return '%s(%r)' % (self.__class__.__name__, self.name)

class Article(Base):

    __tablename__ = 'articles'

    id = Column(Integer, primary_key=True)
    title = Column(String(255), nullable=False, index=True)
    content = Column(Text)
    user_id = Column(Integer, ForeignKey('users.id'))
    cate_id = Column(Integer, ForeignKey('categories.id'))
    tags = relationship('Tag', secondary='article_tag', backref='articles')

    def __repr__(self):
        return '%s(%r)' % (self.__class__.__name__, self.title)


class Category(Base):

    __tablename__ = 'categories'

    id = Column(Integer, primary_key=True)
    name = Column(String(64), nullable=False, index=True)
    articles = relationship('Article', backref='category')

    def __repr__(self):
        return '%s(%r)' % (self.__class__.__name__, self.name)


article_tag = Table(
    'article_tag', Base.metadata,
    Column('article_id', Integer, ForeignKey('articles.id')),
    Column('tag_id', Integer, ForeignKey('tags.id'))
)

class Tag(Base):

    __tablename__ = 'tags'

    id = Column(Integer, primary_key=True)
    name = Column(String(64), nullable=False, index=True)

    def __repr__(self):
        return '%s(%r)' % (self.__class__.__name__, self.name)


if __name__ == '__main__':
    Base.metadata.create_all(engine)

    faker = Factory.create()
    Session = sessionmaker(bind=engine)
    session = Session()

    faker_users = [User(
        username=faker.name(),
        password=faker.word(),
        email=faker.email(),
    ) for i in range(10)]
    print("faker_users: ", faker_users)
	
	
    session.add_all(faker_users)

    faker_categories = [Category(name=faker.word()) for i in range(5)]
    print("faker_categories: ", faker_categories)
    session.add_all(faker_categories)

    faker_tags = [Tag(name=faker.word()) for i in range(20)]
    print("faker_tags: ", faker_tags)
    session.add_all(faker_tags)

    for i in range(100):
        article = Article(
            title=faker.sentence(),
            content=' '.join(faker.sentences(nb=random.randint(10, 20))),
            author=random.choice(faker_users),
            category=random.choice(faker_categories)
        )
        for tag in random.sample(faker_tags, random.randint(2, 5)):
            article.tags.append(tag)
        session.add(article)

    session.commit()