Illegal mix of collations (utf8_general_ci,IMPLICIT) and (gbk_chinese_ci,COERCIBLE) for operation '='

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Error:Illegal mix of collations (utf8_general_ci,IMPLICIT) and (gbk_chinese_ci,COERCIBLE) for operation ‘=‘
Errno:1267

问题很明显，就是Mysql字符编码问题，所以主要排查问题方向应该往设置编码及用到编码的地方

这里是Mysql设置编码的常用命令，一般在链接数据时会用到：

SET CHARACTER_SET_CLIENT = utf8,
CHARACTER_SET_CONNECTION = utf8,
CHARACTER_SET_DATABASE = utf8,
CHARACTER_SET_RESULTS = utf8,
CHARACTER_SET_SERVER = utf8,
COLLATION_CONNECTION = utf8_general_ci,
COLLATION_DATABASE = utf8_general_ci,
COLLATION_SERVER = utf8_general_ci,

Illegal mix of collations (utf8_general_ci,IMPLICIT) and (gbk_chinese_ci,COERCIBLE) for operation '='

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原文地址：http://www.cnblogs.com/wangyulu/p/5524666.html