Incorrect string value: '\xF0\x9F\x92\x90' for column 'xxx' at row 1

1.一般来说MySQL(小于5.5.3)字符集设置为utf8,指定连接的字符集也为utf8，django中save unicode string是木有问题的。但是，当字符串中有特殊字符（如emoji表情符号，以及其他凡是转成utf8要占用4字节的字符），就会有问题，会报错Incorrect string value: '\xF0\x9F\x92\x90</...' for column 'xxx' at row 1

大家都知道Unicode是一个标准，utf8是unicode一个实现方式, 某些Unicode字符转成utf8可能4字节，而在MySQl5.5.3之前，utf8最长只有3字节。

所以呢，这个需要4字节才能表示的Unicode字符会被截断，存不进去。

2. 低版本Mysql<5.5.3貌似没啥好办法，把字段类型改为 MEDIUMBLOB ，其他啥都不用改(继续保持数据库字符集和连接字符集都是utf8)，问题解决。见下图，

<code><span class="pln">mysql</span><span class="pun">></span><span class="pln"> show variables like </span><span class="str">'char%'</span><span class="pun">;</span><span class="pln">
</span><span class="pun">+--------------------------+----------------------------+</span><span class="pln">
</span><span class="pun">|</span><span class="pln"> </span><span class="typ">Variable_name</span><span class="pln">            </span><span class="pun">|</span><span class="pln"> </span><span class="typ">Value</span><span class="pln">                      </span><span class="pun">|</span><span class="pln">
</span><span class="pun">+--------------------------+----------------------------+</span><span class="pln">
</span><span class="pun">|</span><span class="pln"> character_set_client     </span><span class="pun">|</span><span class="pln"> utf8                       </span><span class="pun">|</span><span class="pln"> 
</span><span class="pun">|</span><span class="pln"> character_set_connection </span><span class="pun">|</span><span class="pln"> utf8                       </span><span class="pun">|</span><span class="pln"> 
</span><span class="pun">|</span><span class="pln"> character_set_database   </span><span class="pun">|</span><span class="pln"> utf8                       </span><span class="pun">|</span><span class="pln"> 
</span><span class="pun">|</span><span class="pln"> character_set_filesystem </span><span class="pun">|</span><span class="pln"> binary                     </span><span class="pun">|</span><span class="pln"> 
</span><span class="pun">|</span><span class="pln"> character_set_results    </span><span class="pun">|</span><span class="pln"> utf8                       </span><span class="pun">|</span><span class="pln"> 
</span><span class="pun">|</span><span class="pln"> character_set_server     </span><span class="pun">|</span><span class="pln"> utf8                       </span><span class="pun">|</span><span class="pln"> 
</span><span class="pun">|</span><span class="pln"> character_set_system     </span><span class="pun">|</span><span class="pln"> utf8                       </span><span class="pun">|</span><span class="pln"> 
</span><span class="pun">|</span><span class="pln"> character_sets_dir       </span><span class="pun">|</span><span class="pln"> </span><span class="str">/usr/</span><span class="pln">share</span><span class="pun">/</span><span class="pln">mysql</span><span class="pun">/</span><span class="pln">charsets</span><span class="pun">/</span><span class="pln"> </span><span class="pun">|</span><span class="pln"> 
</span><span class="pun">+--------------------------+----------------------------+</span></code>

这个状态下 MEDIUMBLOB 就能搞定。

3.MySQl>=5.5.3，则可以不用像上面那么做。

3.1 修改mysql配置文件，设置默认字符集utf8mb4, 包括collation

[client]
default-character-set = utf8mb4

[mysql]
default-character-set = utf8mb4

[mysqld]
character-set-client-handshake = FALSE
character-set-server = utf8mb4
collation-server = utf8mb4_unicode_ci
init_connect='SET NAMES utf8mb4'

3.2 重启，确认上述配置生效

其他不用改，都用 utf8mb4 ， django中任意Unicode字符都能存入MySQL。

思路：判断你的MySQL utf8最大长度是不是4，

如果不是，支不支持utf8mb4,

如果不支持，升级 or MEDIUMBLOB

其实这个问题，网上已经太多了，没啥好写的，记一笔，仅为个人成长记录。

吃水不忘挖井人，修bug时参考了这两篇文章。

http://vivisidea.iteye.com/blog/1395571

http://www.linuxidc.com/Linux/2013-05/84360.htm

转载：http://blog.csdn.net/secretx/article/details/21253559

秒客网

Incorrect string value: '\xF0\x9F\x92\x90' for column 'xxx' at row 1

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