安装完成后，无法登陆mysql,按理说新安装后默认是以root用户登陆，而且密码为空，所以可以直接进的，但是出现了下面的问题
F:\mysql-5.7.10-win32\mysql-5.7.10-win32\bin>mysql -u root
ERROR 1045(28000):Access denied for user ‘root‘@‘localhost‘(using password:NO)
经过我上网查资料后发现新版MySQL默认有密码，之后我尝试在配置文件中加了skip-grant-tables,重启之后可以进去了；所以一定是密码的问题
于是我又开始搜索各种解决办法，经过一番努力，终于找到了解决办法
mysql>delete from mysql.user where user=‘root‘ and host=‘localhost‘;
Query OK, 1 row affected(0.01 sec)
mysql> select user,host from mysql.user;
+-----------+----------+
|user |host |
+-----------+----------+
|mysql.sys |localhost |
+-----------+----------+
1 row in set(0.00 sec)
mysql>flush privileges;
Query OK,0 rows affected(0.00 sec)
mysql>grant all on *.* to ‘root‘@‘localhost‘ identified by ‘dingwei351‘;
Query OK,0 rows affected, 1 warning(0.00 sec)
mysql>select user,host from mysql.user;
+----------+-----------+
|user |host |
+----------+-----------+
|mysql.sys |localhost |
|root |localhost |
+----------+-----------+
2 rows in set(0.01 sec)
但是到这还是不行，你用下面的命令会发现一个情况
mysql>select * from mysql.user;
Grant显示N--mysql权限架构体系(应该是这么说)是关闭的，所以应该执行下面的操作
mysql>grant all on *.* to ‘root‘@‘localhost‘ identified by ‘dingwei351‘ with grant option;
Query OK,0 rows affected(0.01 sec)
退出mysql,将skip-grant-tables注掉，然后重启mysql。此时再登陆就可以了。
F：\mysql-5.7.10-win32\mysql-5.7.10-win32\bin>mysql -u root -p
Enter password:**********
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version:5.7.10 MySQL Community Server<GPL>
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