Homebrew安装mysql 5.7

知识点掌握了，还需要不断练习才能熟练运用。下面golang学习网给大家带来一个数据库开发实战，手把手教大家学习《Homebrew安装mysql 5.7》，在实现功能的过程中也带大家重新温习相关知识点，温故而知新，回头看看说不定又有不一样的感悟！

安装Homebrew

https://brew.sh/

brew -v

# 查看 homebrew 是否可用
brew doctor

安装mysql 5.7

# 搜索 mysql 版本
brew search mysql

# 安装 5.7
brew install mysql@5.7

# 配置环境变量，如下图红框1
echo 'export PATH="/opt/homebrew/opt/mysql@5.7/bin:$PATH"' >> ~/.zshrc

# 使配置生效
source ~/.zshrc

# 启动 mysql 服务
mysql.server start

mysql 设置密码

mysql安装完是没有配置密码的，MySQL 被配置为默认只允许来自 localhost 的连接

# 输入安装后，提示的修改密码的命令
mysql_secure_installation


# 无法设置简单密码，增加了密码强度验证插件validate_password
 ... Failed! Error: Your password does not satisfy the current policy requirements



# 查看 msyql密码相关的几个全局参数
mysql> SHOW VARIABLES LIKE 'validate_password%';
+--------------------------------------+--------+
| Variable_name                        | Value  |
+--------------------------------------+--------+
| validate_password_check_user_name    | OFF    |
| validate_password_dictionary_file    |        |
| validate_password_length             | 8      |
| validate_password_mixed_case_count   | 1      |
| validate_password_number_count       | 1      |
| validate_password_policy             | MEDIUM |
| validate_password_special_char_count | 1      |
+--------------------------------------+--------+


# 修改mysql参数配置
mysql> set global validate_password_policy=0;

mysql> set global validate_password_mixed_case_count=0;

mysql> set global validate_password_number_count=0;

mysql> set global validate_password_special_char_count=0;

mysql> set global validate_password_length=3;


# 查看 是否修改成功
mysql> SHOW VARIABLES LIKE 'validate_password%';


# 修改密码
mysql> SET PASSWORD FOR 'root'@'localhost' = PASSWORD('root');

mysql无法远程连接

数据库客户端、命令行可以成功连接本地数据库。
idea SpringBoot项目、其他同学电脑连接我的本地数据库失败

• Access denied for user ‘root’@‘localhost’(using password: YES)
• 拒绝连接
• ERROR 1130 (HY000): Host '10.50.122.22' is not allowed to connect to this MySQL server

#  开启mysql远程访问权限


mysql> use mysql;

mysql> select user, host from mysql.user;
+---------------+-----------+
| user          | host      |
+---------------+-----------+
| root          | localhost         |
| mysql.session | localhost |
| mysql.sys     | localhost |
+---------------+-----------+

#  %代表的是任意机器都能通过root来远程链接到服务器

mysql> update user set host = '%' where user = 'root';

#  更新权限命令
mysql> flush privileges;

# 查看能否远程连接数据库
mysql -uroot -p -h

# 如果不能，继续下面的操作

SpringBoot项目中的配置：用户名、密码、url等都是正确的，而且其他电脑也无法访问我电脑的数据库，估计是mysql绑定的ip有问题
因为是通过homebrew安装的mysql，所以查看brew info mysql

MySQL is configured to only allow connections from localhost by default

# 查找配置文件
 mysql --help | grep cnf

# 用 Homebrew 安装 mysql，默认配置在/usr/local/etc/my.cnf；其他目录不存在my.cnf

vim  /usr/local/etc/my.cnf

# bind-addres的配置绑定了本地IP，所以远程无法连接

# 修改为：
bind-address = 0.0.0.0

# 重启 mysql
brew services restart mysql

# 自此，数据库远程访问成功
mysql -uroot -p -h

mysql 官方文档， bind-address 的配置是这样描述的：

If the address is 0.0.0.0, the server accepts TCP/IP connections on all server host IPv4 interfaces.

If the server was started with —bind-address=127.0.0.1, it will listen for TCP/IP connections only locally on the loopback interface and will not accept remote connections.

今天带大家了解了MySQL的相关知识，希望对你有所帮助；关于数据库的技术知识我们会一点点深入介绍，欢迎大家关注golang学习网公众号，一起学习编程~