Python:操作SQLite数据库简单示例-编程知识

Python:操作SQLite数据库简单示例

本文用最简单的示例演示python标准库提供的SQLite数据库进行新增、查询数据的过程。

代码文件app.py

# -*- coding: UTF-8 -*-
from flask import Flask
import sqlite3app = Flask(__name__)@app.route('/')
def hello_world():return 'Hello World!'#创建数据库
@app.route('/createdb')
def createdb():conn = sqlite3.connect("test.db") #若不存在则自动新建conn.close()return 'createdb ok.'#创建数据表
@app.route('/createtb')
def createtb():conn = sqlite3.connect("test.db")sql = 'create table if not exists user(id char,username text)'conn.execute(sql)conn.close()return 'createtb ok.'#添加记录
@app.route('/add')
def add():conn = sqlite3.connect("test.db")sql = "insert into user(id,username) values(1,'quan')"conn.execute(sql)sql = "insert into user(id,username) values(2,'test')"conn.execute(sql)sql = "insert into user(id,username) values(3,'demo')"conn.execute(sql)conn.commit()conn.close()return 'add ok.'#查询列表
@app.route('/query')
def query():conn = sqlite3.connect("test.db")cur=conn.cursor()sql = "select * from user "cur.execute(sql)list=cur.fetchall()print(f"共计{len(list)}条记录")print(list)cur.close()conn.close()return listif __name__ == '__main__':app.run()

终端执行显示结果：