在linux安裝mysql重啓提示You must SET PASSWORD before executing this statement的解決方法

利用安全模式成功登錄，而後修改密碼，等於給MySql設置了密碼。登錄進去後，想查詢全部存在的數據庫測試下。獲得的結果確實：

ERROR 1820 (HY000): You must SET PASSWORD before executing this statement

很是詭異啊，明明用密碼登錄進去了，怎麼還提示須要密碼。
參考官方的一個文檔，見http://dev.mysql.com/doc/refman/5.6/en/alter-user.html。以下操做後就ok了：

mysql> show databases;
ERROR 1820 (HY000): You must SET PASSWORD before executing this statement
mysql> SET PASSWORD = PASSWORD('123456');
Query OK, 0 rows affected (0.00 sec)

mysql> show databases;
5 rows in set (0.00 sec)

也就是用mysql> SET PASSWORD = PASSWORD('123456');這句話從新設置一次密碼！哎，搞得真費勁啊。

有的童鞋也會遇到以下問題：

最近新裝好的mysql在進入mysql工具時，老是有錯誤提示:

# mysql -u root -p
Enter password:
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
或者
# mysql -u root -p password 'newpassword'
Enter password:
mysqladmin: connect to server at 'localhost' failed
error: 'Access denied for user 'root'@'localhost' (using password: YES)'

如今終於找到解決方法了。原本準備重裝的，如今沒必要了。
方法操做很簡單，以下：
# /etc/init.d/mysql stop
# mysqld_safe --user=mysql --skip-grant-tables --skip-networking &
# mysql -u root mysql
mysql> UPDATE user SET Password=PASSWORD('newpassword') where USER='root' and host='root' or host='localhost';//把空的用戶密碼都修改爲非空的密碼就好了。
mysql> FLUSH PRIVILEGES;
mysql> quit # /etc/init.d/mysqld restart
# mysql -uroot -p
Enter password: <輸入新設的密碼newpassword>

MySql5.6操做時報錯：You must SET PASSWORD before executing this statement解決 mysql> SET PASSWORD = PASSWORD('123456'); Query OK, 0 rows affected (0.03 sec) mysql> create database roger; Query OK, 1 row affected (0.00 sec) 也就是用mysql> SET PASSWORD = PASSWORD('123456');這句話從新設置一次密碼！就搞定了。