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怎么下载mysql服务器 mysql怎么下载安装( 二 )

IT技术安装


mysql GRANT ALL PRIVILEGES ON . TO ‘yangxin’@’%’ IDENTIFIED BY ‘Yangxin0917!’ WITH GRANT OPTION;
以上部分个人实践过，以下内容待实践
数据库存emoji 表情问题
mysql SHOW VARIABLES WHERE Variable_name LIKE ‘character_set_%’ OR Variable_name LIKE ‘collation%’;
+————————–+——————-+
| Variable_name | Value |
+————————–+——————-+
| character_set_client | utf8 |
| character_set_connection | utf8 |
| character_set_database | latin1 |
| character_set_filesystem | binary |
| character_set_results | utf8 |
| character_set_server | latin1 |
| character_set_system | utf8 |
| collation_connection | utf8_general_ci |
| collation_database | latin1_swedish_ci |
| collation_server | latin1_swedish_ci |
+————————–+——————-+
10 rows in set (0.02 sec)
可以看到我的mysql版本是5.7的，utf8mb4有一个使用限制，mysql版本必须是5.5以上，大家需要注意，我目前用的ubuntu系统是16.04的 。当前mysql的字符集配置如上表，我们的目的是更改成utf8mb4 。
3.找到mysql的配置文件 ， 可用命令
sudo find / -name my.cnf
我的配置文件位置如下 ， 个别的位置有所不同
/etc/mysql/mysql.conf.d/mysqld.cnf
4.修改配置文件
在原文中添加以下内容：
[client]
default-character-set = utf8mb4
[mysql]
default-character-set = utf8mb4
[mysqld]
character-set-client-handshake = FALSE
character-set-server = utf8mb4
collation-server = utf8mb4_unicode_ci
init_connect=’SET NAMES utf8mb4’
原文件中无“[client]”和“[mysql]”，需要手动添加上 。
……
Here is entries for some specific programs
The following values assume you have at least 32M ram
[client]
default-character-set = utf8mb4
[mysql]
default-character-set = utf8mb4
[mysqld_safe]
socket = /var/run/mysqld/mysqld.sock
nice = 0
[mysqld]
#
* Basic Settings
#
user = mysql
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
port = 3306
basedir = /usr
datadir = /var/lib/mysql
tmpdir = /tmp
lc-messages-dir = /usr/share/mysql
skip-external-locking
character-set-client-handshake = FALSE
character-set-server = utf8mb4
collation-server = utf8mb4_unicode_ci
init_connect=’SET NAMES utf8mb4’
#
Instead of skip-networking the default is now to listen only on
……
5.重启mysql服务
sudo service mysql restart
6.查看结果
mysql SHOW VARIABLES WHERE Variable_name LIKE ‘character_set_%’ OR Variable_name LIKE ‘collation%’;
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect…
Connection id: 3
Current database: * NONE *
+————————–+——————–+
| 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 |
+————————–+——————–+
10 rows in set (0.00 sec)
MySQL下载及安装教程 MySQL是一个跨平台开源的关系型数据库管理系统，多用于中小型网站或系统的开发 。软件开发使用数据库技术可以方便实现数据的共享，减少数据的冗余，也方便统一对数据进行操作和控制 。MySQL相对于Oracle、DB2等大型数据库具有体积小、速度快、成本低的特点 ， 这些特性使得MySQL在开源世界大受欢迎 。下面我带领大家去学习mySQL的下载及安装 。

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