MySQL 8 带来了全新的体验，比如支持 NoSQL、JSON 等，拥有比 MySQL 5.7 两倍以上的性能提升。本文讲解如何在 Windows 下安装 MySQL 8，以及基本的 MySQL 用法。
下载
下载地址
本例为：MySQL Community Server 8.0.12。
解压
解压至安装目录，比如 D 盘根目录下。
本例为：D:/mysql-8.0.12-winx64。
创建 my.ini
my.ini 是 MySQL 安装的配置文件：
[mysqld]# 安装目录basedir=D://mysql-8.0.12-winx64# 数据存放目录datadir=D://mysqlData//data
my.ini放置在 MySQL 安装目录的根目录下。需要注意的是，要先创建D:/mysqlData目录。data目录是由 MySQL 来创建。
初始化安装
执行：
mysqld --defaults-file=D:/mysql-8.0.12-winx64/my.ini --initialize --console
控制台输出如下，说明安装成功：
>mysqld --defaults-file=D:/mysql-8.0.12-winx64/my.ini --initialize --console2018-08-20T16:14:45.287448Z 0 [System] [MY-013169] [Server] D:/mysql-8.0.12-winx64/bin/mysqld.exe (mysqld 8.0.12) initializing of server in progress as process 50122018-08-20T16:14:45.289628Z 0 [ERROR] [MY-010457] [Server] --initialize specified but the data directory has files in it. Aborting.2018-08-20T16:14:45.299329Z 0 [ERROR] [MY-010119] [Server] Aborting2018-08-20T16:14:45.301316Z 0 [System] [MY-010910] [Server] D:/mysql-8.0.12-winx64/bin/mysqld.exe: Shutdown complete (mysqld 8.0.12) MySQL Community Server - GPL.D:/mysql-8.0.12-winx64/bin>mysqld --defaults-file=D:/mysql-8.0.12-winx64/my.ini --initialize --console2018-08-20T16:15:25.729771Z 0 [System] [MY-013169] [Server] D:/mysql-8.0.12-winx64/bin/mysqld.exe (mysqld 8.0.12) initializing of server in progress as process 181482018-08-20T16:15:43.569562Z 5 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: L-hk!rBuk9-.2018-08-20T16:15:55.811470Z 0 [System] [MY-013170] [Server] D:/mysql-8.0.12-winx64/bin/mysqld.exe (mysqld 8.0.12) initializing of server has completed
其中，“L-hk!rBuk9-.”就是 root 用户的初始化密码。稍后可以做更改。
启动、关闭 MySQL server
执行mysqld就能启动 MySQL server，或者执行 mysqld –console可以看到完整的启动信息：
>mysqld --console2018-08-20T16:18:23.698153Z 0 [Warning] [MY-010915] [Server] 'NO_ZERO_DATE', 'NO_ZERO_IN_DATE' and 'ERROR_FOR_DIVISION_BY_ZERO' sql modes should be used with strict mode. They will be merged with strict mode in a future release.2018-08-20T16:18:23.698248Z 0 [System] [MY-010116] [Server] D:/mysql-8.0.12-winx64/bin/mysqld.exe (mysqld 8.0.12) starting as process 163042018-08-20T16:18:27.624422Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.2018-08-20T16:18:27.793310Z 0 [System] [MY-010931] [Server] D:/mysql-8.0.12-winx64/bin/mysqld.exe: ready for connections. Version: '8.0.12' socket: '' port: 3306 MySQL Community Server - GPL.
关闭，可以执行 mysqladmin -u root shutdown。
使用 MySQL 客户端
使用 mysql 来登录，账号为 root，密码为“L-hk!rBuk9-.”：
>mysql -u root -pEnter password: ************Welcome to the MySQL monitor. Commands end with ; or /g.Your MySQL connection id is 11Server version: 8.0.12Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '/h' for help. Type '/c' to clear the current input statement.
执行下面的语句来改密码。其中“123456”即为新密码。
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY '123456';Query OK, 0 rows affected (0.13 sec)
MySQL 常用指令
显示已有的数据库：
mysql> show databases;+--------------------+| Database |+--------------------+| information_schema || mysql || performance_schema || sys |+--------------------+4 rows in set (0.08 sec)
创建新的数据库：
mysql> CREATE DATABASE lite;Query OK, 1 row affected (0.19 sec)
使用数据库：
mysql> USE lite;Database changed
建表：
建表执行：
mysql> CREATE TABLE t_user (user_id BIGINT NOT NULL, username VARCHAR(20));Query OK, 0 rows affected (0.82 sec)
查看表：
查看数据库中的所有表：
mysql> SHOW TABLES;+----------------+| Tables_in_lite |+----------------+| t_user |+----------------+1 row in set (0.00 sec)
查看表的详情：
mysql> DESCRIBE t_user;+----------+-------------+------+-----+---------+-------+| Field | Type | Null | Key | Default | Extra |+----------+-------------+------+-----+---------+-------+| user_id | bigint(20) | NO | | NULL | || username | varchar(20) | YES | | NULL | |+----------+-------------+------+-----+---------+-------+2 rows in set (0.00 sec)
插入数据：
mysql> INSERT INTO t_user(user_id, username) VALUES(1, '老卫');Query OK, 1 row affected (0.08 sec)
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持VeVb武林网。
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