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首先导入Flask和SQLAlchemy模块:

from flask import Flask
from flask_sqlalchemy import SQLAlchemy

声明app和db对象:

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///inquestion.db' 
db = SQLAlchemy(app)

有三个表:Artist,Album和Genre.该Artist对象可以链接到多个Albums.并且Album对象可以链接到多个Artists.的albums_to_artists_table是保持之间的关系Artists和Albums紧密的:

albums_to_artists_table = db.Table('albums_to_artists_table',
                          db.Column('album_id', db.Integer, db.ForeignKey('album.id')),
                          db.Column('artist_id', db.Integer, db.ForeignKey('artist.id')))

class Genre(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(80), unique=True)


class Album(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(80), unique=True)
    genre_id = db.Column(db.Integer, …