由於 MySQLdb 模組還不支援 Python3.x，所以 Python3.x 如果想要連接MySQL需要安裝 pymysql 模組。
pymysql 模組可以透過 pip 安裝。但如果你使用的是 pycharm IDE，則可以使用 project python 安裝第三方模組。
[File] >> [settings] >> [Project: python] >> [Project Interpreter] >> [Install按鈕]
由於Python統一了資料庫連接的接口，所以pymysql 和MySQLdb 在使用方式上是類似的：
##charset(str): 連線編碼
connection物件支援的方法
cursor()使用此連線建立並回傳遊標
commit() 提交目前交易
rollback() 回滾目前交易
cursor物件支援的方法
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,'乔布斯','18012345678',0.00,0.00,0.00);
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()#==================測試結果===================
