from flask import Flaskfrom flask_sqlalchemy import SQLAlchemyimport configapp = Flask(__name__)app.config.from_object(config)db=SQLAlchemy(app)class Writer(db.Model): __tablename__='writer' id = db.Column(db.Integer,primary_key=True) name = db.Column(db.String(50),nullable=False) books = db.relationship('Book',backref='writers')class Book(db.Model): __tablename__='books' id=db.Column(db.Integer,primary_key=True) title=db.Column(db.String(50),nullable=False) publishing_office=db.Column(db.String(100),nullable=False) isbn = db.Column(db.String(50),nullable=False) writer_id = db.Column(db.Integer,db.ForeignKey('writer.id'))db.create_all()@app.route('/add')def add(): user1 = Writer(name='李兴华') user2 = Writer(name='Sweigart') db.session.add(user1) db.session.add(user2) book1 = Book(title='名师讲坛——java开发实战经典（第2版）',publishing_office='清华大学出版社', isbn='9787302483663',writer_id='1') book2=Book(title='android开发实战',publishing_office='清华大学出版社', isbn='9787302483663',writer_id='1') book3=Book(title='Python游戏编程',publishing_office='人民邮电大学出版社', isbn='9787151466419',writer_id='2') db.session.add(book1) db.session.add(book2) db.session.add(book3) db.session.commit() return '数据添加成功'@app.route('/select')def select(): writer = Writer.query.filter(Writer.id=='1').first() book = writer.books for k in book: print(k) print(k.title) book=Book.query.filter(Book.id=='1').first() writer=book.writers print(writer.name) return '查询数据成功'@app.route('/')def hello_world(): return "Hello world!"if __name__ == '__main__': app.run()
来源：https://www.cnblogs.com/hnsya/p/12275875.html