python连接mysql数据库

python连接mysql数据库简单案例

1. 安装启动mysql

2. 创建数据库与表结构

   CREATE DATABASE /*!32312 IF NOT EXISTS*/`test` /*!40100 DEFAULT CHARACTER SET utf8 */;
   
   USE `test`;
   
   DROP TABLE IF EXISTS `user`;
   
   CREATE TABLE `user` (
     `id` bigint(11) NOT NULL AUTO_INCREMENT,
     `username` varchar(255) NOT NULL,
     `password` varchar(255) NOT NULL,
     PRIMARY KEY (`id`)
   ) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;
   
   insert  into `user`(`id`,`username`,`password`) values (1,'user','e10adc3949ba59abbe56e057f20f883e'),(2,'admin','e10adc3949ba59abbe56e057f20f883e');
   
   

3. 导入pymysql模块

   pip install pymysql
   

4. 编写代码

   import pymysql
   
   # 打开链接
   conn = pymysql.connect(host="localhost", user="root", password="root", database="test")
   # 获取游标
   cur = conn.cursor()
   
   # 执行sql，返回受影响的行数或者查询结果的条数
   result = cur.execute("select * from user")
   # 提交事务(如果是更新操作)
   # conn.commit()
   print("查询到:%s条数据" % result)
   # 查询所有
   result_list = cur.fetchall()
   print(result_list)
   
   cur.close()
   conn.close()
   
   

5. 控制台输出

   查询到:2条数据
   ((1, 'user', 'e10adc3949ba59abbe56e057f20f883e'), (2, 'admin', 'e10adc3949ba59abbe56e057f20f883e'))