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

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

来源: 作者: 时间:2016-02-18 10:28 【

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..
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,有的在本身已经为gbk或gb2312时候,但是查询出来却是乱码,这是因为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_ci

SET collation_database = gb2312_chinese_ci

SET 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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