异常处理：使用UTF-8编码MySQL仍然抛出Incorrect string value异常
原来问题出在mysql上，mysql如果设置编码集为utf8那么它最多只能支持到3个字节的UTF-8编码，而4个字节的UTF-8字符还是存在的，这
之前还以为从上至下统一用上UTF-8就高枕无忧了，哪知道今天在抓取新浪微博的数据的时候还是遇到字符的异常。
从新浪微博抓到的数据在入库的时候抛出异常：
Incorrect string value: '\xF0\x90\x8D\x83\xF0\x90...'
发现导致异常的字符不是繁体而是某种佛经文字。。。额滴神。。。但是按道理UTF-8应该能支持才对啊，，他不是万能的么？
原来问题出在mysql上，mysql如果设置编码集为utf8那么它最多只能支持到3个字节的UTF-8编码，而4个字节的UTF-8字符还是存在的，这样一来如果你建表的时候用的utf8字符集出异常就理所当然了。
解决方法很简单，修改字段或者表的字符集为utf8mb4。
比较蛋疼的是，字符集utf8mb4在mysql 5.5.3之后才支持。。。
要研究如何升级mysql了。 见
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