1、下载安装：
mysql：https://dev.mysql.com/downloads/mysql/
选择不登录,直接下载即可
安装：下一步下一步即可，最后选择安全性强的密码设置，设置一个至少八位的密码
然后在系统偏好里开启
配置环境变量：
-打开终端，
ls -a查看全部文件，
open .bash_profile 编辑文件（若不存在就先新建一个 touch .bash_profile）
在文本中添加export PATH=${PATH}:/usr/local/mysql/bin ，保存
让 .bash_profile 配置文件立即生效：source ~/.bash_profile
navicat：百度地址
我下载的试用，以后网上找对应版本的注册码使用即可。
2.使用：
打开navicat，connection-mysql-输入连接名、密码，ok。首次使用若提示重置密码，按提示操作即可
新建数据库：new database-
运行sql文件：在对应的数据库上，执行execute sql file-选择对应的sql文件-start-执行完成后close-refresh刷新表
3.遇到问题：
#navicat链接数据库时出错#
输入密码后提示：
Client does not support authentication protocol requested by server; consider upgrading MySQL client
终端输入也提示错误
$ sudo ./mysql
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
$ mysqld -install
-bash: mysqld: command not found
$ sudo ./mysqld -install
2018-10-10T05:27:29.522288Z 0 [System] [MY-010116] [Server] /usr/local/mysql-8.0.12-macos10.13-x86_64/bin/mysqld (mysqld 8.0.12) starting as process 3193
2018-10-10T05:27:29.525119Z 0 [Warning] [MY-010159] [Server] Setting lower_case_table_names=2 because file system for /usr/local/mysql-8.0.12-macos10.13-x86_64/data/ is case insensitive
2018-10-10T05:27:29.525198Z 0 [ERROR] [MY-010123] [Server] Fatal error: Please read "Security" section of the manual to find out how to run mysqld as root!
2018-10-10T05:27:29.525222Z 0 [ERROR] [MY-010119] [Server] Aborting
2018-10-10T05:27:29.525369Z 0 [System] [MY-010910] [Server] /usr/local/mysql-8.0.12-macos10.13-x86_64/bin/mysqld: Shutdown complete (mysqld 8.0.12) MySQL Community Server - GPL.
解决办法：
打开cmd：
cd /usr/local/mysql/bin/
mysql -u root -p
输入安装时设置的密码，启动成功，进入到了mysql的终端
mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.03 sec)
mysql> use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql>ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '你的八位以上密码';
Query OK, 0 rows affected (0.06 sec)
mysql> SELECT plugin FROM mysql.user WHERE User = 'root';
再次连接navicat，输入设置的密码。连接成功