python 连接 mysql

rule

import pymysql.cursors# 连接数据库connect = pymysql.Connect(　　
    host='localhost',
　　
    port=3310,
　　
    user='woider',
　　
    passwd='3243',
　　
    db='python',
　　
    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()