MySQL5.7改配置文件服务无法启动解决方法

MySQL5.7改配置文件服务无法启动解决方法

先记录下用source命令导sql文件,备忘:

mysql -uroot -ppassword

show variables like "%character_set";//查看编码,不是utf8的先去改编码,改配置文件,重启服务

或者mysql -uroot -ppassword --default-character-set=utf8

create database dbname;

use dbname;

show variables like "max_allowed_packet";//默认是4M,导容量较大的文件时会出现MySQL Server has gone away

set global max_allowed_packet=1024*1024*20;//设置为20M,重启会失效,最好去配置文件加,这样每次开电脑服务重启就会根据配置文件去设置

source D:/name.sql;

 

 

服务无法启动原因分析:

这部分纯属个人理解,有错还望指正,在C:\Program Files\MySQL\MySQL Server 5.7路径下没有my.ini配置文件;只有my-default.ini文件,里面的配置几乎没有,没有指定编码以及其他很多参数,我猜测mysql的默认编码就是GBK,于是我去C:\ProgramData\MySQL\MySQL Server 5.7路径下找到my.ini文件将datadir路径改为datadir=C:/Program Files/MySQL/MySQL Server 5.7\Data,复制到C:\Program Files\MySQL\MySQL Server 5.7路径下然后初始化,启动服务,成功,用临时密码登入,改密码,下面是步骤和命令:

 

mysqld --initialize --console;//会给root用户打印一个临时登录密码

net start mysql57

mysql -uroot -p 用临时密码登录,在dos窗口输的密码登不进去可以在记事本打完再copy到dos窗口,我是这样的,这个问题也坑了我半天

set password for root@localhost=password('123456');改密码

搞定。

mysqld remove mysql57

mysqld -install mysql

net start mysql

net stop mysql

 

mysql5.7.18.1修改用户密码报错ERROR 1054 (42S22): Unknown column 'password' in 'field list'解决办法

本意向修改一个用户的密码,网上搜到的命令为如下

1

mysql> update user set password=password(“新密码”) where user=”用户名”;

执行后报错  ERROR 1054(42S22) Unknown column 'password' in ‘field list’

错误的原因是 5.7版本下的mysql数据库下已经没有password这个字段了,password字段改成了authentication_string

所以请使用一下命令:

>mysql -u root -p
Enter password: ********
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 12
Server version: 5.7.18-log MySQL Community Server (GPL)

Copyright (c) 2000, 2017, 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> use mysql;
Database changed
mysql> select User from user;  #此处为查询用户命令
+-----------+
| User      |
+-----------+
| *******  |
| mysql.sys |
| root      |
+-----------+
3 rows in set (0.00 sec)

mysql> update user set password=password("*******") where user="*******";  #修改密码报错
ERROR 1054 (42S22): Unknown column 'password' in 'field list'
mysql> update mysql.user set authentication_string=password('*******') where user='*******';  #修改密码成功
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
Bye

n>mysql -u ******* -p #以该用户登录成功.
Enter password: ********
…………………………
mysql>

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