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mysql替换表的字段里面内容，如例子： mysql> select host,user from user where user='testuser'; +-----------------------+----------+ | host | user | +-----------------------+----------+ | localhost.localdomain | testuser | +-----------------------+----------+ update字段host的内容，把"main"改成"slave",用REPLACE mysql> update user set host=REPLACE(host,'main','slave') where...
