1）下载
mysql5.6.51介质下载地址：https://downloads.mysql.com/archives/community/
2）下载后解压到D:或E：
3）创建环境变量
4）配置参数
my.ini参数如下
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
character-set-server = utf8mb4
collation-server = utf8mb4_unicode_ci
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.
basedir = E:\mysql-5.6.51-winx64
datadir = E:\mysql-5.6.51-winx64\data
port = 3306
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
my-default.ini参数如下：
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.
basedir = .....
datadir = .....
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
mysqld
character-set-server=utf8mb4
mysql
default-character-set=utf8mb4
以管理员身份运行cmd（不然权限不够），通过命令进入mysql bin 目录运行命令|：
mysqld --initialize-insecure --user=mysql
再次执行如下命令
mysql -hlocalhost -uroot -p
netstat -ano|findstr 3306
mysqld -install
到此 说明mysql 已经安装成功。
注意如发现mysql服务安装路径不对可通过指令sc delete MySQL进行删除后再安装；
启动mysql服务：命令如下
E:\mysql-5.6.51-winx64\bin>net start mysql
MySQL 服务正在启动 .
MySQL 服务已经启动成功。
5）用户登录及实际操作
mysql -u root -p第一次登录无密码。
查看数据库：show databases;
创建数据库：create database dbai;
进入数据库：use dbai;
使用查看当前数据库的表：show tables;
user表如果没有创建：create table user(username varchar(8),password varchar(8));
向表里添加数据：insert into user(username,password) values('admin','1234');
insert into user(username,password) values('user1','1111');
然后查看user表：select * from user;
创建新表格
create table bearnumsex(id varchar(6),DateTime datetime,swimgap FLOAT(5,2),innersize1 int(6),innersize2 int(6),unit varchar(50),date varchar(10),type varchar(10),repair varchar(10),imgpath varchar(50));
alter table bearnumsex convert to character set utf8mb4 collate utf8mb4_bin; 更新表格使其支持中文
6)问题处理
问题1：程序运行访问数据库提升如下：数据库打开失败 Access denied for user 'root'@localhost (using password:YES) QMYSQL:Unable to connect
问题2：
QSqlDatabase: QMYSQL driver not loaded
QSqlDatabase: available drivers: QSQLITE QMYSQL QMYSQL3 QODBC QODBC3 QPSQL QPSQL7
处理方法：将mysql数据路径lib下的lib和dll放到Qt程序的可执行程序下。
