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对mysql Illegal mix of collations(gbk_chinese_ci,IMPLICIT) a_MySQL

程序员文章站 2022-03-17 19:52:35
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对mysql Illegal mix of collations(gbk_chinese_ci,IMPLICIT) and (gb2312_chinese_ci,I的解决

对于常见的乱码问题,有的在数据库本身已经为gbk或gb2312时候,但是查询出来却是乱码,这是因为mysql在连接的过程中还有道编码,因此将连接的编码设为gb2312或utf-8

即可,如:

jdbc:mysql://localhost:3306/ipanel?useUnicode=true&characterEncoding=UTF-8

hibernate和jdbc的参数设置是不一样,但大体相同,网上类似的资料很多。

最重要的是这个问题:

Illegal mix of collations (gbk_chinese_ci,IMPLICIT) and (gb2312_chinese_ci,IMPLICIT) for operation '='

相信有很多人碰到,意思是说字符编码不一样,不能进行比较,也就是说数据库内部的编码都不一样,有的数据是

gbk_chinese_ci,有的数据是gb2312_chinese_ci,因此解决此问题的核心就是将数据库所有的编码进行统一。

进入命令行模式,

如果MySQL数据库已经安装好,可以使用下列SQL命令查看MySQL当前的字符集设置:

mysql> SHOW VARIABLES LIKE 'character_set_%'; +--------------------------+----------------------------+ | Variable_name | Value | +--------------------------+----------------------------+ | character_set_client | latin1 | | character_set_connection | latin1 | | character_set_database | latin1 | | character_set_results | latin1 | | character_set_server | latin1 | | character_set_system | utf8 | | character_sets_dir | /usr/share/mysql/charsets/ | +--------------------------+----------------------------+ 7 rows in set (0.00 sec) mysql> SHOW VARIABLES LIKE 'collation_%'; +----------------------+-------------------+ | Variable_name | Value | +----------------------+-------------------+ | collation_connection | latin1_swedish_ci | | collation_database | latin1_swedish_ci | | collation_server | latin1_swedish_ci | +----------------------+-------------------+ 3 rows in set (0.00 sec) 

依次执行:

set  character_set_client  =gb2312; set  character_set_connection  =gb2312; set   character_set_database  =gb2312; set  character_set_results  =gb2312; set character_set_server  =gb2312; set  character_set_system  =gb2312; --此处utf-8也可以

然后执行:

SET collation_server = gb2312_chinese_ciSET collation_database = gb2312_chinese_ciSET collation_connection =gb2312_chinese_ci

执行完之后,请检查mysql下每个数据库,表,字段是否都是gb2312,不是则改过来,这样子就不会出现

Illegal mix of collations (gbk_chinese_ci,IMPLICIT) and (gb2312_chinese_ci,IMPLICIT) for operation '='
这个错误了,网上有资料说要重装,其实根本就不必,改动其编码即可

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