本文实例讲述了python使用flask框架操作sqlite3的两种方式。分享给大家供大家参考,具体如下:
方式一:raw_sql
import sqlite3 from flask import Flask, rbdZiCNzVequest, jsonify app = Flask(__name__) DATABASE_URI = ":memory:" # 创建表格、插入数据 @app.before_first_request def create_db(): # 连接 conn = sqlite3.connect(DATABASE_URI) c = conn.cursor() # 编程客栈创建表 c.execute编程客栈('''DROP TABLE IF EXISTS user''') c.execute('''CREATE TABLE user (id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT, email TEXT)''') # 数据 # 格式:用户名,邮箱 purchases = [('admin', 'admin@example.com'), ('guest1', 'guest1@example.com'), ('guest2', 'guest2@example.com'), ('guest3', 'guest3@example.com'), ('guest4', 'guest4@example.com')] # 插入数据 c.executemany('INSERT INTO user(name, email) VALUES (?,?)', purchases) # 提交!!! conn.commit() # 关闭 conn.close() def get_db(): db = sqlite3.connect(DATABASE_URI) db.row_factory = sqlite3.Row return db def query_db(query, args=(), one=False): db = get_db() cur = db.execute(query, args) db.commit() rv = cur.fetchall() db.close() return (rv[0] if rv else None) if one else rv @app.route("/user") def users(): res = query_db("SELECT * FROM user WHERE id <= ?", args=(6,)) return "<br>".join(["{0}: {1}".format(user[1], user[2]) for user in res]) @app.route("/user/<int:id>") def user(name): res = query_db("SELECT * FROM user WHERE id=?", args=(id,)) #不妨设定:第一次只返回6个数据 return jsonify(id = res[1], name = res[2], email = res[3]) # 返回json格式 if __name__ == "__main__": app.run(debug=True)
方式二:orm(既flask-SQLAlchemy)
# flask_sqlalchemy.py from flask import Flask from flask_sqlalchemy import SQLAlchemy app = Flask(__name__) app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite://' app.config['SQLALC开发者_MysqlHEMY_TRACK_MODIFICATIONS'] = True db = SQLAlchemy(app) # 定义ORM class User(db.Model): id = db.Column(db.Integer, primary_key=True) name = db.Column(db.String(80), unique=True) email = db.Column(db.String(120), unique=True) def __init__(self, name, email): self.name = name self.email = email def __repr__(self): return '<User %r>' % self.name # 创建表格、插入数据 @app.before_first_req编程客栈uest def create_db(): # Recreate database each time for demo #db.drop_all() db.create_all() admin = User('admin', 'admin@example.com') db.session.add(admin) guestes = [User('guest1', 'guest1@example.com'), User('guest2', 'guest2@example.com'), User('guest3', 'guest3@example.com'), User('guest4', 'guest4@example.com')] db.session.add_all(guestes) db.session.commit() # 查询 @app.route('/user') def users(): users = User.query.all() return "<br>".join(["{0}: {1}".format(user.name, user.email) for user in users]) # 查询 @app.route('/user/<int:id>') def user(id): user = User.query.filter_by(id=id).one() return "{0}: {1}".format(user.name, user.email) # 运行 if __name__ == '__main__': app.run('127.0.0.1', 5000)
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