MySQL修改密码

A

root

account password can
be set several ways. The following discussion demonstrates three methods:

Use the

SET
PASSWORD

statement

Use the

UPDATE

statement

Use the mysqladmin command-line
client program

To assign passwords using

SET
PASSWORD

, connect to the server as

root

and
issue a

SET
PASSWORD

statement for each

root

account
listed in the

mysql.user

table.

For Unix, do this:

shell> [code]mysql -u root

mysql>

SET PASSWORD FOR 'root'@'localhost' = PASSWORD('newpwd

');
mysql>

SET PASSWORD FOR 'root'@'127.0.0.1' = PASSWORD('newpwd

');
mysql>

SET PASSWORD FOR 'root'@'::1' = PASSWORD('newpwd

');
mysql>

SET PASSWORD FOR 'root'@'host_name

' = PASSWORD('

newpwd

');
[/code]

You can also use a single statement that assigns a password to all

root

accounts
by using

UPDATE

to
modify the

mysql.user

table
directly. This method works on any platform:

shell> [code]mysql -u root

mysql>

UPDATE mysql.user SET Password = PASSWORD('newpwd

')
->

WHERE User = 'root';

mysql>

FLUSH PRIVILEGES;

[/code]

The

FLUSH

statement
causes the server to reread the grant tables. Without it, the password change remains unnoticed by the server until you restart it.

To assign passwords to the

root

accounts
using mysqladmin,
execute the following commands:

shell> [code]mysqladmin -u root password "newpwd

"
shell>

mysqladmin -u root -h host_name

password "

newpwd

"
[/code]

Those commands apply both to Windows and to Unix. The double quotation marks around the password are not always necessary, but you should use them if the password contains spaces or other characters that are special to your command interpreter.
The mysqladmin method
of setting the

root

account
passwords does not work for the

'root'@'127.0.0.1'

or

'root'@'::1'

account.
Use the

SET
PASSWORD

method shown earlier.