0.前言

mysql8安裝：https://blog.csdn.net/qq_21383435/article/details/80577038

1.下載

地址：https://www.mysql.com/downloads/

然后找到mysql

找到下載地址

選擇以前的版本，然后選擇系統和版本

點擊下載

然后下載后雙擊安裝，直到結束

2.修改root密碼

2.1 轉到管理員權限

lcc@lcc bin$ sudo su

進入mysql目錄

cd /usr/local/mysql/bin/

2.2 跳過權限

root@lcc bin# ./mysqld_safe --user=mysql --skip-grant-tables --skip-networking &

[1] 955

root@lcc bin# Logging to '/usr/local/mysql-5.7.28-macos10.14-x86_64/data/lcc.err'.

2019-11-09T02:23:40.6NZ mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql-5.7.28-macos10.14-x86_64/data

2.3 登錄mysql

root@lcc bin# ./mysql -u root -p

Enter password:

Welcome to the MySQL monitor. Commands end with ; or g.

Your MySQL connection id is 7

Server version: 5.7.28 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>

2.4 修改密碼

ysql> use mysql;

ysql> update user set password=password('123456') where user='root' and host='localhost';

ERROR 1054 (42S22): Unknown column 'password' in 'field list'

執行后報錯 　ERROR 1054(42S22) Unknown column ‘password’ in ‘field list’

錯誤的原因是 5.7版本下的mysql數據庫下已經沒有password這個字段了，password字段改成了authentication_string

mysql> update mysql.user set authentication_string=password('*******') where user='*******'; #修改密碼成功

Query OK, 1 row affected, 1 warning (0.00 sec)

Rows matched: 1 Changed: 1 Warnings: 1

mysql> flush privileges; #立即生效

Query OK, 0 rows affected (0.00 sec)

mysql> quit

2.5 驗證登錄

# 退出root用戶

root@lcc bin# exit

exit

lcc@lcc bin$ ./mysql -u root -p

Enter password:123456

Welcome to the MySQL monitor. Commands end with ; or g.

Your MySQL connection id is 183

Server version: 5.7.28

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.

# 參考：https://blog.csdn.net/memory6364/article/details/82426052

mysql> show databases;

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

mysql> alter user 'root'@'localhost' identified by '123456';

Query OK, 0 rows affected (0.01 sec)

mysql> flush privileges;

Query OK, 0 rows affected (0.01 sec)

mysql> show databases;

+--------------------+

| Database |

+--------------------+

| information_schema |

| mysql |

| performance_schema |

| sys |

+--------------------+

4 rows in set (0.00 sec)

mysql>

總結

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