flask-sqlalchemy 初步

  先创建数据库依赖文件如 flask-sqlalchemy.py

from flask_sqlalchemy import SQLAlchemy 

db = SQLAlchemy()

然后，创建数据库表单，database.py

from database_extention import db 

class User(db.Model):
    id = db.Column( db.Integer, primary_key=True)
    name = db.Column( db.String( 50 ), unique = True )
    email = db.Column( db.String( 120 ), unique = True )
    password = db.Column( db.String( 120 ) )

    __tablename__ = 'users'

    def __init__( self, name, email, password ):
        self.name = name
        self.email = email
        self.password = password

    def __repr( self ):
        return '<User %r>' % (self.name)

最后，在应用中引用数据库：

from flask import Flask, session, g, render_template

from database_extention import db 

from database import User

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:////tmp/test.db'
db.init_app( app )
db.create_all(app =app)


@app.route('/')
def show_home():
    return "ok"

@app.route('/add')
def add_user():
    user = User('liuchao', 'liuchao@hotmail.com', 'liu')
    db.session.add(user)
    db.session.commit()
    return 'save ok'

@app.route('/showrecord')
def show_record():
    users = User.query.all()
    records = [ dict( username=user.name, email=user.email ) for user in users ]
    
    return render_template('showrecord.html', records = records )

if __name__ == "__main__":
     app.run(debug=True)

需要注意的是，直接return records会导致TypeError: 'list' object is not callable错误。需要render_template模板来处理。