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loftPermalink:'',
id:'fks_',
blogTitle:'MySQL修改数据库编码为UTF8',
blogAbstract:'  &&
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{list wl as x}{/list}MySQL如何修改字符集utf8改为utf8mb4
在实行sql server 向
迁移数据时,报错:
Incorrect string value: '\xF0\x9F\x98\x8A'&
原因是mysql 采用的是 utf8 的字符集,而该字符集最多占用三个字节,而一些 表情 需要占用 4个字节,所以需要将 utf8 改成 utf8mb4。
原始配置为:
#mysql 5.5 新增参数
character_set_server=utf8
collation_server=utf8_bin
我将 character_set_server=utf8 改为:character_set_server=utf8mb4,重启mysql 却报错:
发生错误 1067 进程意外终止
但是查看错误日志,却没有显示是什么错误信息。有倒腾了一会儿,想到是不是 collation_server 也要修改成 utf8mb4_bin,测试的结果果然如此。
所以要注意在将 MySQL字符集 utf8 改为 utf8mb4 时,一定要注意 collation_server 也要同时修改!
干脆将 default-character-set=utf8mb4 也改成了算了。
最后的字符配置如下:
default-character-set=utf8mb4
init_connect='set names utf8mb4'
character_set_server=utf8mb4
collation_server=utf8mb4_bin
修改之后,启动成功。CATEGORIES:
一、升级前。
mysql& SHOW VARIABLES LIKE 'character_set%';
+--------------------------+--------------------------------------------------------------------+
| Variable_name
+--------------------------+--------------------------------------------------------------------+
| character_set_client
| character_set_connection | utf8
| character_set_database
| character_set_filesystem | binary
| character_set_results
| character_set_server
| character_set_system
| character_sets_dir
| /home/sdkserver/local/mysql-5.5.43-linux2.6-x86_64/share/charsets/ |
+--------------------------+--------------------------------------------------------------------+
8 rows in set (0.00 sec)
mysql& SHOW VARIABLES LIKE 'collation%';
+----------------------+-----------------+
| Variable_name
+----------------------+-----------------+
| collation_connection | utf8_general_ci |
| collation_database
| utf8_unicode_ci |
| collation_server
| utf8_unicode_ci |
+----------------------+-----------------+
3 rows in set (0.00 sec)
二、修改配置文件。
打开MySQL的配置文件,将字符集的配置修改成如下:
default-character-set = utf8mb4
default-character-set = utf8mb4
character-set-client-handshake = FALSE
character-set-server = utf8mb4
collation-server = utf8mb4_general_ci
init_connect='SET NAMES utf8mb4'
三、升级后。
mysql& SHOW VARIABLES LIKE 'character_set%';
+--------------------------+--------------------------------------------------------------------+
| Variable_name
+--------------------------+--------------------------------------------------------------------+
| character_set_client
| character_set_connection | utf8mb4
| character_set_database
| character_set_filesystem | binary
| character_set_results
| character_set_server
| character_set_system
| character_sets_dir
| /home/nieyong/local/mysql-5.5.43/share/charsets/
+--------------------------+--------------------------------------------------------------------+
8 rows in set (0.00 sec)
mysql& SHOW VARIABLES LIKE 'collation%';
+----------------------+--------------------+
| Variable_name
+----------------------+--------------------+
| collation_connection | utf8mb4_general_ci |
| collation_database
| utf8mb4_general_ci |
| collation_server
| utf8mb4_general_ci |
+----------------------+--------------------+
3 rows in set (0.00 sec)
Copyright &2008 - LLC. All rights reserved. Unauthorized use is prohibited.新手求教!怎么创建数据库时指定字符集为utf8_unicode_ci!_mysql吧_百度贴吧
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新手求教!怎么创建数据库时指定字符集为utf8_unicode_ci!收藏
我只会create database 数据库 default character set utf8;但是这样不能指定为utf8_unicode_ci默认是utf8_general_我想弄成utf8_general_ci,求大神教教
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collate utf8_unicode_ci
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