一.创建数据库test sql语句：create database test
二.创建表trade sql语句：
DROP TABLE IF EXISTS `trade`;
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,'马化腾','654321',0.00,0.00,0.00);
三.通过pyMySQL操纵MySQL数据库（pyMySQL下载命令：pip install pymysql）
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import pymysql.cursors
# 连接数据库
connect = pymysql.Connect(
host='localhost',
port=3306,
user='root',
passwd='',
db='test',
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 = ('马云', '123456', 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, '123456')
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 = ('123456',)
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（可以先不测这个，观察数据库是否已经添加数据）
# sql = "DELETE FROM trade WHERE account = '%s' LIMIT %d"
# data = ('123456', 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 = '654321' "
sql_2 = "UPDATE trade SET expend = expend + 1000 WHERE account = '654321' "
sql_3 = "UPDATE trade SET income = income + 2000 WHERE account = '654321' "
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2000
except 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()