mysql utf8改utf8mb4
由于需要用到utf8mb4,之前是utf8现在给改成utf8mb4
查看当前环境
SHOW VARIABLES WHERE Variable_name LIKE 'character\_set\_%' OR Variable_name LIKE 'collation%';
+--------------------------+--------------------+
| Variable_name | Value |
+--------------------------+--------------------+
| character_set_client | latin1 |
| character_set_connection | latin1 |
| character_set_database | utf8mb4 |
| character_set_filesystem | binary |
| character_set_results | latin1 |
| character_set_server | utf8mb4 |
| character_set_system | utf8 |
| collation_connection | latin1_swedish_ci |
| collation_database | utf8mb4_general_ci |
| collation_server | utf8mb4_general_ci |
+--------------------------+--------------------+
打开MySQL的配置文件,将字符集的配置修改成如下:
[client]
default-character-set = utf8mb4 [mysql]
default-character-set = utf8mb4 [mysqld]
character-set-client-handshake = FALSE
character-set-server = utf8mb4
collation-server = utf8mb4_general_ciinit_connect=
'SET NAMES utf8mb4'
修改后
root@localhost:(none)>SHOW VARIABLES WHERE Variable_name LIKE 'character\_set\_%' OR Variable_name LIKE 'collation%';
+--------------------------+--------------------+
| Variable_name | Value |
+--------------------------+--------------------+
| character_set_client | utf8mb4 |
| character_set_connection | utf8mb4 |
| character_set_database | utf8mb4 |
| character_set_filesystem | binary |
| character_set_results | utf8mb4 |
| character_set_server | utf8mb4 |
| character_set_system | utf8 |
| collation_connection | utf8mb4_unicode_ci |
| collation_database | utf8mb4_unicode_ci |
| collation_server | utf8mb4_unicode_ci |
+--------------------------+--------------------+ root@localhost:(none)>\s;
--------------
mysql Ver 14.14 Distrib 5.1.73, for redhat-linux-gnu (x86_64) using readline 5.1 Connection id: 61
Current database:
Current user: root@localhost
SSL: Not in use
Current pager: stdout
Using outfile: ''
Using delimiter: ;
Server version: 5.5.36-log Source distribution
Protocol version: 10
Connection: Localhost via UNIX socket
Server characterset: utf8mb4
Db characterset: utf8mb4
Client characterset: utf8mb4
Conn. characterset: utf8mb4
UNIX socket: /tmp/mysql.sock
Uptime: 3 min 22 sec
修改后发现连接报错
mysql: Character set 'utf8mb4' is not a compiled character set and is not specified in the '/usr/share/mysql/charsets/Index.xml' file
修改/usr/share/mysql/charsets/Index.xml
修改前
<charset name="utf8">
<family>Unicode</family>
<description>UTF-8 Unicode</description>
<alias>utf-8</alias>
<collation name="utf8_general_ci" id="33">
<flag>primary</flag>
<flag>compiled</flag>
</collation>
<collation name="utf8_bin" id="83">
<flag>binary</flag>
<flag>compiled</flag>
</collation>
</charset>
修改后
<charset name="utf8mb4">
<family>Unicode</family>
<description>UTF-8 Unicode</description>
<alias>utf-8</alias>
<collation name="utf8_general_ci" id="33">
<flag>primary</flag>
<flag>compiled</flag>
</collation>
<collation name="utf8_bin" id="83">
<flag>binary</flag>
<flag>compiled</flag>
</collation>
</charset>
mysql utf8改utf8mb4的更多相关文章
- mysql 5.5 数据库 utf8改utf8mb4
由于需要用到utf8mb4,之前是utf8现在给改成utf8mb4 查看当前环境 SHOW VARIABLES WHERE Variable_name LIKE 'character\_set\_ ...
- Java Unicode编码 及 Mysql utf8 utf8mb3 utf8mb4 的区别与utf8mb4的过滤
UTF-8简介 UTF-8(8-bit Unicode Transformation Format)是一种针对Unicode的可变长度字符编码,也是一种前缀码.它可以用来表示Unicode标准中的任何 ...
- MySQL utf8 和 utf8mb4 的区别
utf-8 时变化长度的编码,储存一个code point 需要1~4个字节. 然而,mysql的utf8只存储最多3个字节per code point. 所以,utf8字符集不能存储所有的unico ...
- Emoji表情符号录入MySQL数据库报错的解决方案(MySQL utf8与utf8mb4区别)
本文转自:http://blog.itpub.net/26230597/viewspace-1243233/前言:手机app应用评论的时候,恢复表情符号,提示失败. 1,查看tomcat后台日志,核心 ...
- MySQL UTF8 转为 utf8mb4
https://mathiasbynens.be/notes/mysql-utf8mb4#utf8-to-utf8mb4 How to support full Unicode in MySQL da ...
- MySQL 如何修改字符集 utf8 改为 utf8mb4
在实行sql server 向 mysql 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 ...
- 浅谈mysql中utf8和utf8mb4区别
转自:http://ourmysql.com/archives/1402 实践过程中发现有时mysql的字符集会引起故障,所以需要了解下这个知识点. 一.简介 MySQL在5.5.3之后增加了这个u ...
- 清官谈mysql中utf8和utf8mb4区别
清官谈mysql中utf8和utf8mb4区别 发布时间:2015 年 10 月 4 日 发布者: OurMySQL 来源:JavaRanger - 专注JAVA高性能程序开发.JVM.Mysql优化 ...
- MySQL 编码:utf8 与 utf8mb4,utf8mb4_unicode_ci 与 utf8mb4_general_ci
参考:mysql字符集小结 utf8mb4 已成为 MySQL 8.0 的默认字符集,在MySQL 8.0.1及更高版本中将 utf8mb4_0900_ai_ci 作为默认排序规则. 新项目只考虑 u ...
随机推荐
- [洛谷P5068][Ynoi2015]我回来了
题目大意:给你一张$n(n\leqslant10^3)$个点$m(m\leqslant10^5)$个点的无向无权图,多组询问,每次询问给你一些二元组$(x_i,y_i)$,求有多少个$u$于至少一个二 ...
- [洛谷P4735]最大异或和
题目大意:有一串初始长度为$n$的序列$a$,有两种操作: $A\;x:$在序列末尾加一个数$x$ $Q\;l\;r\;x:$找一个位置$p$,满足$l\leqslant p\leqslant r$, ...
- BZOJ1597 土地购买 【dp + 斜率优化】
1597: [Usaco2008 Mar]土地购买 Time Limit: 10 Sec Memory Limit: 162 MB Submit: 5466 Solved: 2035 [Submi ...
- CodeForces - 158B.Taxi (贪心)
CodeForces - 158B.Taxi (贪心) 题意分析 首先对1234的个数分别统计,4人组的直接加上即可.然后让1和3成对处理,只有2种情况,第一种是1多,就让剩下的1和2组队处理,另外一 ...
- GSM之AT操作命令详解20160615
因工作接触到GSM模块,所以收集整理了一下关于操作GSM模块的AT命令的资料: 1.AT的历史与应用 1.1 AT的历史AT命令集是由拨号调制解调器(MODEM)的发明者贺氏公司(Hayes)为了控制 ...
- ImageNet: what is top-1 and top-5 error rate?
https://stats.stackexchange.com/questions/156471/imagenet-what-is-top-1-and-top-5-error-rate Your cl ...
- New Year and Domino 二维前缀和
C. New Year and Domino time limit per test 3 seconds memory limit per test 256 megabytes input stand ...
- HDU 4258 斜率优化dp
Covered Walkway Time Limit: 30000/10000 MS (Java/Others) Memory Limit: 131072/131072 K (Java/Othe ...
- 神奇的sed替换
1. 替换含有某关键字的行 $ sed 's/.*ami-07bc4ae4d4d662f53.*/ami = "ami-07bc4ae4d4d662f53898989898989" ...
- [技巧篇]04.使用PowerDesigner逆向生成