python中executemany的使用

 conn = MySQLdb.connect(host = “localhost”, user = “root”, passwd = “password”, db = “myDB”, charset=’utf8′)
 cursor = conn.cursor()
 sql = “insert into myTable (created_day,name,count) values(%s,%s,%s) ON DUPLICATE KEY UPDATE count=count+values(count)”
 args=[("2012-08-27","name1",100),("2012-08-27","name1",200),("2012-08-27","name2",300)]
 try:
     cursor.executemany(sql, args)
 except Exception as e:
     print0(“执行MySQL: %s 时出错：%s” % (sql, e))
 finally:
     cursor.close()
     conn.commit()
     conn.close()

这里args是一个包含多个元组的数组，每个元组对应mysql当中的一条数据，注意这里的created_day对应的%s没有引号。这里推测executemany自己首先对sql语句进行正则匹配%s然后在此基础上，对字符串进行嵌入处理，如果这里%s加上引号的话，插入mysql当中会出现”0000-00-00″类型的错误日期。