本文参考：https://www.jianshu.com/p/2316ec970946
https://blog.csdn.net/qq_37392932/article/details/81011150
ubantu下安装数据库，本想安装5.7的但是在ubantu14.04 我总是安装显示5.5的版本 最终升级为5.5.62
1.下载mysql-apt 配置包,并安装，在安装过程中会让选择mysql版本号，选择5.7版本后，点击OK
wget https://dev.mysql.com/get/mysql-apt-config_0.8.1-1_all.debsudo dpkg -i mysql-apt-config_0.8.1-1_all.deb
2.更新apt-get
sudo apt-get update
更新时可能出现错误如：
-
W: GPG error: http://repo.mysql.com jessie InRelease: The following signatures were invalid: KEYEXPIRED 1487236823 KEYEXPIRED 1487236823 KEYEXPIRED 1487236823
解决办法：
先查看执行命令：apt-key list
---------------------------------------------
pub 4096R/89DF5277 2010-07-11
uid Guillaume Plessis <gui@dotdeb.org>
sub 4096R/3D624A3B 2010-07-11
sub 4096R/A2098A6E 2010-07-11
pub 1024D/5072E1F5 2003-02-03 [expired: 2017-02-16]
uid MySQL Release Engineering <mysql-build@oss.oracle.com>
---------------------------------------------
删除mysql 的repository GPG key，删除命令如下：
sudo apt-key del 5072E1F5
---------------------------------------------
删除完了之后，检查还有没有那个mysql的key
没有了，执行命令：apt-key adv --keyserver pgp.mit.edu --recv-keys A4A9406876FCBD3C456770C88C718D3B5072E1F5
如下输出
--------------------------------------------------
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --homedir /tmp/tmp.z5SEIWWrbt --no-auto-check-trustdb --trust-model always --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyring /etc/apt/trusted.gpg.d/debian-archive-jessie-automatic.gpg --keyring /etc/apt/trusted.gpg.d/debian-archive-jessie-security-automatic.gpg --keyring /etc/apt/trusted.gpg.d/debian-archive-jessie-stable.gpg --keyring /etc/apt/trusted.gpg.d/debian-archive-squeeze-automatic.gpg --keyring /etc/apt/trusted.gpg.d/debian-archive-squeeze-stable.gpg --keyring /etc/apt/trusted.gpg.d/debian-archive-wheezy-automatic.gpg --keyring /etc/apt/trusted.gpg.d/debian-archive-wheezy-stable.gpg --keyring /etc/apt/trusted.gpg.d/php.gpg --keyserver pgp.mit.edu --recv-keys A4A9406876FCBD3C456770C88C718D3B5072E1F5
gpg: requesting key 5072E1F5 from hkp server pgp.mit.edu
gpg: key 5072E1F5: "MySQL Release Engineering <mysql-build@oss.oracle.com>" 62 new signatures
gpg: Total number processed: 1
gpg: new signatures: 62
--------------------------------------------------
完成后，再执行apt-get update3.在安装数据库过程中会自动卸载老版本数据
-
sudo apt-get install mysql-server
这个过程会提示你输入密码，该密码就是登录密码
4.安装mysql 后，使用mysql_upgrade升级数据库文件版本
sudo mysql_upgrade -uroot -p'youpassword'
5.重启mysql,并检查数据是否正常
sudo service mysql restart
mysqlcheck -uroot -p'youpassword' --all-databases
6.数据库命令
#进入MySQL: mysql -u root -p
#启动: sudo service mysql start
#重启:sudo service mysql restart
#关闭: sudo service mysql stop
7.数据库配置字符类型为utf8
修改MySQL配置文件（/et/mysql/my.cnf）如下:
[client]
default_character_set=utf8
[mysql]
default_character_set=utf8
[mysqld]
character_set_server=utf8
8.更新数据库密码并可以远程连接数据库
>use mysql;
> update user set authentication_string=PASSWORD("这里输入你要改的密码") where User='root'; #更改密码 我使用了这行
> update user set plugin="mysql_native_password"; #如果没这一行可能也会报一个错误，因此需要运行这一行
> flush privileges; #更新所有操作权限
>ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass4!' (修改密码)
>GRANT ALL PRIVILEGES ON *.* TO 'myuser'@'%'IDENTIFIED BY 'mypassword' WITH GRANT OPTION;
>FLUSH PRIVILEGES（开启远程访问）
然后重启数据库：
sudo service mysql restart
附带：ubant卸载mysql
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sudo apt-get autoremove --purge mysql-server-5.0
sudo apt-get remove mysql-server
sudo apt-get autoremove mysql-server
sudo apt-get remove mysql-common
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清除残留数据
| 1 |
dpkg -l |grep ^rc|awk '{print $2}' |sudo xargs dpkg -P
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本文只为自己后续使用