MySql - “Can‘t connect to MySQL server on ‘127.0.0.1‘ ([Errno 61] Connection refused)“

之前用 PyMySql 模组连结本地端的 MySQL 工作的挺顺利的，谁知道在 Mac 重开机后资料库连不上了，报错讯息如下：

 "Can't connect to MySQL server on '127.0.0.1' ([Errno 61] Connection refused)"

查了一堆网文，发现可能是先前在安装时配置设的不对，因此要更改 my.cnf 的设定内容。

1. 先确定 MySQL 取用配置文件的位置。在MySQL 的安装目录下执行：$ mysql --help | grep cnf，可以看到MySQL最优先使用的配置文件是 /etc/my.cnf:

$ mysql --help | grep cnforder of preference, my.cnf, $MYSQL_TCP_PORT,
/etc/my.cnf /etc/mysql/my.cnf /usr/local/etc/my.cnf ~/.my.cnf

2. cd 到 /etc/my.cnf, 编辑这份文件内容需要系统使用者权限，所以用 sudo vim 进行编辑。配置文件内容如下：

# Default Homebrew MySQL server config
[client]port = 3306
socket = /tmp/mysql.sock[mysqld]
# 设置与MySQL伺服器联线的 port
port = 3306# 设置与MySQL伺服器联线的socket位置 <- 缺乏或设置错误会导致（Can’t connect to local MySQL server through socket ‘/tmp/mysql.sock’）
socket = /tmp/mysql.sock# 设置与MySQL伺服器联线的资料夹位置
datadir = /usr/local/var/mysql# 设置暂存档资料夹位置
tmpdir = /tmp# 设置连线 IP
bind-address = 127.0.0.1#设置pid资料夹位置 <- 缺乏或设置错误会导致（The server quit without updating PID file）
pid-file = /usr/local/var/mysql/Ha.lan.pid）
pid-file = /usr/local/var/mysql/Ha.lan.pid

修改完之后按 esc +：+q！退出

my.cnf 里的配置设定修改完成后，MySql server终于可以顺利启动了！安装目录下的 support-files 资料夹里可以start / stop / restart SQL server. 因为是用 root 登录的，所以直接下指令，不用 sudo：

$ cd  /usr/local/Cellar/mysql@5.7/5.7.32/support-files/
$ mysql.server start

接着用 mysql -u root -p 登入之后，就可以用 SQL指令来操作资料库了：

$ mysql -u root -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.7.32 HomebrewCopyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| recommend          |
| stock              |
| sys                |
| test               |
| test2              |
+--------------------+
8 rows in set (0.00 sec)

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MySql - “Can‘t connect to MySQL server on ‘127.0.0.1‘ ([Errno 61] Connection refused)“

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