從官網下載MySQL-5.7.11-winx64壓縮版，安裝后發現竟然有密碼，嘗試無果，通過修改密碼搞定

安裝成功后：

關閉mysql服務在跟目錄下修改文件my.ini，內容如下：注意兩點 1：內容中myql的安裝目錄換成讀者的安裝目錄；2最后一行代表登錄是否需要密碼，這里我們繞過密碼登錄進入mysql修改密碼，所以不注釋skip-grant-tables

####################配置文件開始################### 
 
 # For advice on how to change settings please see 

 # http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html 
 
 # *** DO NOT EDIT THIS FILE. It's a template which will be copied to the 
 
 # *** default location during install, and will be replaced if you 

 # *** upgrade to a newer version of MySQL. 
 
 [client] 
 
 default-character-set=utf8 
 
 [mysqld] 
 
 port=3306 
 # D:\Program Files\mysql-5.7.11-winx64\mysql-5.7.11-winx64 
 basedir ="D:\Program Files\mysql-5.7.11-winx64\mysql-5.7.11-winx64/" 
 
 datadir ="D:\Program Files\mysql-5.7.11-winx64\mysql-5.7.11-winx64/data/" 
 
 tmpdir ="D:\Program Files\mysql-5.7.11-winx64\mysql-5.7.11-winx64/data/" 
 
 socket ="D:\Program Files\mysql-5.7.11-winx64\mysql-5.7.11-winx64/data/mysql.sock" 
 
 log-error="D:\Program Files\mysql-5.7.11-winx64\mysql-5.7.11-winx64/data/mysql_error.log" 
 
  #server_id = 2 
 
 #skip-locking 

 max_connections=100 
 
 table_open_cache=256 
 
 query_cache_size=1M 
 
 tmp_table_size=32M 
 
 thread_cache_size=8 
 
 innodb_data_home_dir="D:\Program Files\mysql-5.7.11-winx64\mysql-5.7.11-winx64/data/" 
 
 innodb_flush_log_at_trx_commit =1 
 
 innodb_log_buffer_size=128M 
 
 innodb_buffer_pool_size=128M 
 
 innodb_log_file_size=10M 
 
 innodb_thread_concurrency=16 
 
 innodb-autoextend-increment=1000 
 
 join_buffer_size = 128M 
 
 sort_buffer_size = 32M 
 
 read_rnd_buffer_size = 32M 
 
 max_allowed_packet = 32M 
 
 explicit_defaults_for_timestamp=true 
 
 sql-mode="STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION" 
 
 skip-grant-tables 
 
 
####################配置文件結束###################

修改保存后，在cmd中，由于我們已經在path配置了環境變量，所以我們可以直接啟動mysql

net start mysql

啟動成功后，登錄mysql

mysql -u root -p

密碼為空 這里我們直接回車登錄成功
登錄成功后，我們修改數據庫執行如下

use mysql

update user set authentication_string=password("123456") where user="root";

這里注意最后必需加上分號

成功后刷新

flush privileges;

致此我們密碼就修改成功了，退出關閉mysql服務，然后把my.ini中最后一行注釋掉，從新啟動mysql服務，發現新密碼生效。

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