### 方法1
# mysqladmin -uroot -h hostname password 'new-password' -p;
### 方法2
mysql> SET PASSWORD FOR 'user'@'host'=PASSWORD('new-password');
### 方法3
mysql> UPDATE mysql.user SET PASSWORD=PASSWORD('new-password') WHERE condition;
### 方法4
mysql> GRANT PRIVILEGES ON *.* TO 'user'@'host' IDENTIFIED BY 'pass-world';