mysql安装配置

本来不打算写的，但是最近又安装了一次，每次安装都得百度一遍。。。所以还是自己写一篇，下次安装也不用再找别人的。。

1.下载

2.配置系统变量

MYSQL_HOME:D:\Java\mysql-8.0.18-winx64

Path变量里加上 %MYSQL_HOME%\bin

3.新建一个my-default.ini文件

内容如下：

# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.6/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.

[mysqld]

# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M

# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin

# These are commonly set, remove the # and set as required.
port=3306
basedir=D:\Java\mysql-8.0.18-winx64
datadir=D:\Java\mysql-8.0.18-winx64\data
# port = .....
# server_id = .....


# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M 

sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES 

4.安装。。。

必须用管理员身份打开命令行。。

 1）mysqld --initialize --console   

 这个命令会生成3中的data文件夹，所以如果安装失败重新安装的时候，执行此命令前先删掉data文件夹

这里红框部分是初始密码，第四步会用上

2） mysqld install mysql  

这个命令的mysql是一个mysql服务代号，如果mysql已经存在，执行1）的时候会生成mysql2，因此这里的命令就要用对应的net install mysql2, 这里如果想删掉mysql2, 可以执行 mysqld -remove mysql2

3） net start mysql 

启动mysql服务

4）登录mysql并修改密码

 mysql -u root -p 

  输入刚刚1）中的密码....

修改密码: ALTER USER 'root'@'localhost' IDENTIFIED BY '123456'; // 记住你的密码是123456

退出: exit;

完成。。。。。