mysql -u root -p
mysql -uroot -p --socket=/data1/mysqldata/mysql/mysql.sock (使用 ps -ef |grep mysql 查看 --socket=/data1/mysqldata/mysql/mysql.sock)
use mysql;
show databases; #此处为查询有多少个数据库实例
select User from user; #此处为查询用户命令
update user set password=password("*******") where user="*******"; #修改密码报错 (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)
update mysql.user set authentication_string=password('*******') where user='*******'; #修改密码成功
示例:
update mysql.user set authentication_string=password('IT123456.') where user='root';
flush privileges; #立即生效
quit