安裝5.7版本的mysql無密碼設置的情況

一、windows安裝mysql5.7數據庫密碼
管理員身份打開cmd，輸入mysql -u root -p回車會直接進入如下：

Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 184
Server version: 5.7.22-log MySQL Community Server (GPL)

Copyright (c) 2000, 2018, 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數據庫，輸入：use mysql;

接下來輸入：

mysql> update user set authentication_string = password("123456") where user = "root";
Query OK, 0 rows affected, 1 warning (0.00 sec)
Rows matched: 1 Changed: 0 Warnings: 1
mysql> flush privileges; --刷新

這樣以后退出數據庫，重新輸入mysql -u root -p，輸入密碼就可以進入了。