使用MYSQL数据库

## Using MYSQL Database
### Install using homebrew: `brew install mysql`

```
We've installed your MySQL database without a root password. To secure it run:
    mysql_secure_installation

MySQL is configured to only allow connections from localhost by default

To connect run:
    mysql -uroot

To have launchd start mysql now and restart at login:
  brew services start mysql
Or, if you don't want/need a background service you can just run:
  mysql.server start (stop, restart, status)

```

* To connect: `mysql -u root`
    * The `-u` says login as user `root` 
* To exit: `exit`
 
### Set default mysql password
* Run in command line: `msqladmin -u root password`
* Then it will prompt you for a new password!
*  **Once you've set a password, you will need to run `mysql -u root -p` to login**

### Install ruby gem mysql
* `gem install mysql2`, not `mysql`

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