python sqlite3教程_Python使用flask框架操作sqlite3的两种方式
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, request, 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()
# 创建表
c.execute('''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', '[email protected]'),
('guest1', '[email protected]'),
('guest2', '[email protected]'),
('guest3', '[email protected]'),
('guest4', '[email protected]')]
# 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 "
".join(["{0}: {1}".format(user[1], user[2]) for user in res])
@app.route("/user/")
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['SQLALCHEMY_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 '' % self.name
# 创建表格、插入数据
@app.before_first_request
def create_db():
# Recreate database each time for demo
#db.drop_all()
db.create_all()
admin = User('admin', '[email protected]')
db.session.add(admin)
guestes = [User('guest1', '[email protected]'),
User('guest2', '[email protected]'),
User('guest3', '[email protected]'),
User('guest4', '[email protected]')]
db.session.add_all(guestes)
db.session.commit()
# 查询
@app.route('/user')
def users():
users = User.query.all()
return "
".join(["{0}: {1}".format(user.name, user.email) for user in users])
# 查询
@app.route('/user/')
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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