在mysql命令行中执行
SET PASSWORD FOR ‘root‘@‘localhost‘ = PASSWORD(‘123456‘);
GRANT ALL PRIVILEGES ON *.* TO ‘root‘ @‘%‘ IDENTIFIED BY ‘‘ WITH GRANT OPTION;
flush privileges;
若以上方法行不通则用：
use mysql;
UPDATE user SET Password=PASSWORD(‘123456‘) where USER=‘root‘;
flush privileges;
解决用navicate远程连接数据库出现1045 access denied for user 'root'@'localhost' using password yes
原文：http://www.cnblogs.com/ryanlamp/p/5555086.html
