python 连接 mysql
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()
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