想在一个表里插入一个记录，当表的最后记录是相同用户名时，只更新时间，否则插入一个新纪录，怎么可以最简单地用mysql实现呢？
WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.
Copyright ©1998-2025 wenxuecity.com All rights reserved. Privacy Statement & Terms of Use & User Privacy Protection Policy
