mac下 MySQL的安装/启动/停止/重启

mysql 安装

# 直接到官网上下载:
https://dev.mysql.com/get/Downloads/MySQL-8.0/mysql-8.0.15-macos10.14-x86_64.dmg

安装完毕后会在/usr/local/目录下生成一个mysql的文件夹:

MySQL服务的启动、重启、停止

# 启动
sudo /usr/local/mysql/support-files/mysql.server start
# 重启
sudo /usr/local/mysql/support-files/mysql.server restart
# 停止
sudo /usr/local/mysql/support-files/mysql.server stop

或者是:打开“系统偏好设置”,单击下端的“MySQL”图标,在“MySQL”对话框中,单击“start MySQL server”按钮。

安装mysql后,登录报错:

mac ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

解决方法:

# 第一步:如果mysql服务正在进行,将之停止。
# 第二步:在终端中以管理员权限启动mysqld_safe,命令如下:
sudo /usr/local/mysql/bin/mysqld_safe --skip-grant-tables

执行结果如下:

2019-03-31T03:06:54.6NZ mysqld_safe Logging to '/usr/local/mysql/data/macdeMacBook-Pro.local.err'.
2019-03-31T03:06:54.6NZ mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/data

第三步:不要关闭当前的终端窗口,新建一个终端窗口,输入如下命令,回车登录mysql

/usr/local/mysql/bin/mysql

登陆成功后的欢迎信息:

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 8.0.15 MySQL Community Server - GPL
Copyright (c) 2000, 2019, 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> 

使用mysql的数据库:

use mysql;

更新root的密码:

update user set authentication_string='root' where Host='localhost' and User='root';

注意:
1、有的版本的mysql中,密码可能存储在password字段中,可以使用"describe user;"命令来查看下表结构再操作
2、authentication_string的值一定通过password函数来计算(password(‘root’)) # 加上会报语法错误
执行结果如下:

Query OK, 1 row affected, 1 warning (0.01 sec)
Rows matched: 1  Changed: 1  Warnings: 1

退出mysql:

exit

最后一步:关闭mysqld_safe进程,重启mysql服务。

登录mysql

/usr/local/mysql/bin/mysql -uroot -proot

这个时候,如果执行查询之类的操作,比如执行"show databases;",可能会有如下提示:

ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.

根据提示进行操作,输入如下SQL语句,这个语句的作用是修改root用户的口令为root:

alter user 'root'@'localhost' identified by 'root';

结果:

Query OK, 0 rows affected

至此,问题解决。

参考:https://www.cnblogs.com/benbenzhu/p/5578162.html

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