mac mysql 5.7 安装过程

1：https://dev.mysql.com/downloads/ 下载Community版本“Mac OS X 10.12 (x86, 64-bit), DMG Archive”

2：双击安装 最后一步会生成随机的数据库密码一定要记住，否则会很麻烦

3：打开 terminal 输入 mysql --version 查看安装状态。

4：如果查询失败则需要配置环境变量  修改.bash_profile文件，增加如下内容
export PATH=${PATH}:/usr/local/mysql/bin
保存并执行source ~/.bash_profile 使环境变量生效

5：登录数据库
mysql -u root -p
     登陆成功，但是运行命令的时候会报错，提示我们需要重设密码。(密码就是第二步中的密码)
mysql> show databases;
     ERROR 1820 (HY000): You must reset your password using ALTER USER statement
     before executing this statement.
mysql>
   修改密码，新密码为123456
    set PASSWORD =PASSWORD('123456');
   再次执行show databases;就正常了。


6：编码集设置
mysql> show variables like '%char%';
+--------------------------+--------------------------------------------------------+
| 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                                                   |
| character_sets_dir       | /usr/local/mysql-5.7.18-macos10.12-x86_64/share/charsets/  |
+--------------------------+--------------------------------------------------------+
8 rows in set (0.00 sec)
character_set_database 默认是latin1 输入中文的话 会有乱码问题。需要修改该my.cnf文件。默认在/etc问价下是没有的，需要自己创建一个，文件内容如下：
[mysqld]
character-set-server=utf8mb4

[client]
default-character-set=utf8mb4

[mysql]
default-character-set=utf8mb4
重启mysql服务
再次查询
+--------------------------+-----------------------------------------------------------+
| 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                                                      |
| character_sets_dir       | /usr/local/mysql-5.7.18-macos10.12-x86_64/share/charsets/ |
+--------------------------+-----------------------------------------------------------+
8 rows in set (0.00 sec)
修改完毕＃