pymysql 模块可以通过 pip 安装。但如果你使用的是 pycharm IDE，则可以使用 project python 安装第三方模块。

[File] >> [settings] >> [Project: python] >> [Project Interpreter] >> [Install按钮]

使用Python的pymysql模块连接数据库的接口，相关的参数如下：

pymysql.Connect()参数说明host(str):      MySQL服务器地址port(int):      MySQL服务器端口号user(str):      用户名passwd(str):    密码db(str):        数据库名称charset(str):   连接编码connection对象支持的方法cursor()        使用该连接创建并返回游标commit()        提交当前事务rollback()      回滚当前事务close()         关闭连接cursor对象支持的方法execute(op)     执行一个数据库的查询命令fetchone()      取得结果集的下一行fetchmany(size) 获取结果集的下几行fetchall()      获取结果集中的所有行rowcount()      返回数据条数或影响行数close()         关闭游标对象

创建MySQL数据库

首先在连接数据库之前，先创建一个表，方便测试pymysql的功能：

CREATE TABLE `trade` (  `id` int(4) unsigned NOT NULL AUTO_INCREMENT,  `name` varchar(6) NOT NULL COMMENT '用户真实姓名',  `account` varchar(11) NOT NULL COMMENT '银行储蓄账号',  `saving` decimal(8,2) unsigned NOT NULL DEFAULT '0.00' COMMENT '账户储蓄金额',  `expend` decimal(8,2) unsigned NOT NULL DEFAULT '0.00' COMMENT '账户支出总计',  `income` decimal(8,2) unsigned NOT NULL DEFAULT '0.00' COMMENT '账户收入总计',  PRIMARY KEY (`id`),  UNIQUE KEY `name_UNIQUE` (`name`)) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;INSERT INTO `trade` VALUES (1,'乔布斯','18012345678',0.00,0.00,0.00);

Python连接MySQL数据库

使用Python脚本实现增删改查和事务处理，代码如下：

import pymysql.cursors# 连接数据库connect = pymysql.Connect(    host='192.168.11.200',    port=3306,    user='root',    passwd='root',    db='db5',    charset='utf8')# 获取游标cursor = connect.cursor()# 插入数据sql = "INSERT INTO trade (name, account, saving) VALUES ( '%s', '%s', %.2f )"data = ('雷军', '13512345678', 10000)cursor.execute(sql % data)connect.commit()print('成功插入', cursor.rowcount, '条数据')# 修改数据sql = "UPDATE trade SET saving = %.2f WHERE account = '%s' "data = (8888, '13512345678')cursor.execute(sql % data)connect.commit()print('成功修改', cursor.rowcount, '条数据')# 查询数据sql = "SELECT name,saving FROM trade WHERE account = '%s' "data = ('13512345678',)cursor.execute(sql % data)for row in cursor.fetchall():    print("Name:%s\tSaving:%.2f" % row)print('共查找出', cursor.rowcount, '条数据')# 删除数据sql = "DELETE FROM trade WHERE account = '%s' LIMIT %d"data = ('13512345678', 1)cursor.execute(sql % data)connect.commit()print('成功删除', cursor.rowcount, '条数据')# 事务处理sql_1 = "UPDATE trade SET saving = saving + 1000 WHERE account = '18012345678' "sql_2 = "UPDATE trade SET expend = expend + 1000 WHERE account = '18012345678' "sql_3 = "UPDATE trade SET income = income + 2000 WHERE account = '18012345678' "try:    cursor.execute(sql_1)  # 储蓄增加1000    cursor.execute(sql_2)  # 支出增加1000    cursor.execute(sql_3)  # 收入增加2000except Exception as e:    connect.rollback()  # 事务回滚    print('事务处理失败', e)else:    connect.commit()  # 事务提交    print('事务处理成功', cursor.rowcount)# 关闭连接cursor.close()connect.close()

测试结果如下：