mysql出现1045错误怎么办

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–mysql5.6，安装好后进行登录出现
[root@mytest_db usr]# mysql -uroot -p
Enter password:
ERROR 1045 (28000): Access denied for user root @ localhost (using password: NO)

提示密码问题，再用命令修改，也会出现以下错误
[root@mytest_db usr]# mysqladmin -u root password petrel
mysqladmin: connect to server at localhost failed
error: Access denied for user root @ localhost (using password: NO)

这个时候需要用这种方法进行处理
– 重启 mysql 服务，采用 mysqld_safe 的方式进行
[root@mytest_db usr]# service mysql stop
Shutting down MySQL…[ OK ]
[root@mytest_db usr]# mysqld_safe –user=mysql –skip-grant-tables –skip-networking
[1] 5043
启动后，就可以直接不用密码直接进入了，这个时候重新设置密码
[root@mytest_db usr]# mysql -uroot
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.6.19 MySQL Community Server (GPL)

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type help; or \h for help. Type \c to clear the current input statement.

mysql use mysql
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql update user set Password=PASSWORD(petrel) where user = root
Query OK, 4 rows affected (0.00 sec)
Rows matched: 4 Changed: 4 Warnings: 0

mysql flush privileges;
Query OK, 0 rows affected (0.00 sec)

mysql quit
Bye
[root@mytest_db usr]# service mysql restart
这个时候，再进行登录就没问题了

[root@mytest_db data]# mysql -uroot -ppetrel
Warning: Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.6.19

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type help; or \h for help. Type \c to clear the current input statement.

登录后，需要再进行一次密码设置才能使用。
mysql use mysql;
ERROR 1820 (HY000): You must SET PASSWORD before executing this statement
mysql grant all privileges on *.* to root@ localhost identified by petrel
ERROR 1820 (HY000): You must SET PASSWORD before executing this statement
mysql set PASSWORD=PASSWORD(petrel
Query OK, 0 rows affected (0.00 sec)

– 出现 mysql.user 表里面用户为空时出现
ERROR 1045 (28000): Access denied for user
这个时候可以进行如下处理
删除这些为空的用户或者更新为其他用户名
删除 user.user 中值为 NULL 的, 或更新 NULL 为其它值等
mysql delete from user where user is NULL
Query OK, 1 rows affected (0.00 sec)
或者更新为其它值
mysql update user set user= mytest where user is NULL
Query OK, 1 rows affected (0.00 sec)

– 如果 mysql.user 表里面没有可以访问的用户，也会出现
MYSQL ERROR 1045 (28000): Access denied for user (using password: YES)
这个时候，我们就要采用如下步骤进行
[root@mytest_db usr]# service mysql stop
Shutting down MySQL…[ OK ]
[root@mytest_db usr]# mysqld_safe –user=mysql –skip-grant-tables –skip-networking
[root@mytest_db usr]# mysql -uroot
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.6.19 MySQL Community Server (GPL)

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type help; or \h for help. Type \c to clear the current input statement.
mysql select * from user;
发现没有用户
mysql INSERT INTO user(host, user, password, select_priv, insert_priv, update_priv) VALUES (localhost , username , PASSWORD(‘yourpassword), Y , Y , Y
Query OK, 1 row affected, 3 warnings (0.00 sec)

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