方法一、通过navicat中sql语句新增

CREATE USER 'username'@'localhost' IDENTIFIED BY 'password';
GRANT ALL PRIVILEGES ON *.* TO 'username'@'localhost' WITH GRANT OPTION;
FLUSH PRIVILEGES;

把其中的username和password改成自己的即可

如果将上面的localhost改成%，则这个用户可以通过局域网访问
如

CREATE USER 'username'@'%' IDENTIFIED BY 'password';
GRANT ALL PRIVILEGES ON *.* TO 'username'@'%' WITH GRANT OPTION;
FLUSH PRIVILEGES;

查看已新增

方法二、通过mysql命令行新增

CREATE USER 'username'@'localhost' IDENTIFIED BY 'password';
GRANT ALL PRIVILEGES ON *.* TO 'username'@'localhost' WITH GRANT OPTION;
FLUSH PRIVILEGES;

把其中的username和password改成自己的即可

查看已新增