MySQL database localhost's root user login encountered failure

Issue:Access denied for user ' root ' @ ' localhost ' (using Password:yes)

Open the MySQL directory under the My.ini file (Linux is/etc/my.cnf), add a line at the end of the file "Skip-grant-tables", save and close the file.
2. Restart the MySQL service.
3, enter "Mysql-uroot-p" in the command line (do not enter a password), enter the database.
4, execute, "use MySQL;" Use the MySQL database.
5. Execute, "Update user set Password=password (" Rootadmin ") where user= ' root '; (Change the root password)
(During the period I also select the record in the user table, query all the time shows some garbled, and then I only query the user table in the host, user, password field, it seems to show 3 records, there are 1 No name.) Of course, in order to solve the problem, I can not control it. )
6. Open the My.ini file in MySQL directory, delete the last line "Skip-grant-tables", save and close the file.
7. Restart the MySQL service.
8, enter "Mysql-uroot-prootadmin" in the command line, the problem is done.
MY.CNF samples such as the next

# Example MySQL config file for medium systems.##-a system with little memory (32m-64m) where MySQL plays# a n important part, or systems up to 128M where MySQL was used together with# other programs (such as a Web server) # # MySQL P Rograms look for option files in a set of# locations which depend on the deployment platform.# you can copy this option fi Le to one of those# locations. For information about these locations, see:# http://dev.mysql.com/doc/mysql/en/option-files.html## in this file, you can u Se All long options This a program supports.# If you want to know which options a program supports and run the program# with             The "--help" option.# the following options would be passed to all MySQL clients[client] #password = Your_passwordport = 3306socket =/tmp/mysql.sock# Here follows entries for some specific programs# the MySQL Server[mys Qld]port = 3306socket =/tmp/mysql.sockskip-external-lockinglog-error=/alidata/log/mysql/error.Logkey_buffer_size = 16mmax_allowed_packet = 1mtable_open_cache = 64sort_buffer_size = 512Knet_buffer_length = 8Kread_ Buffer_size = 256kread_rnd_buffer_size = 512kmyisam_sort_buffer_size = 8m# Don ' t listen on a TCP/IP port at all. This can is a security enhancement,# if all processes then need to connect to mysqld run in the same host.# all Interactio N with Mysqld must is made via Unix sockets or named pipes.# Note that using the this option without enabling named Pipes on W indows# (via the "enable-named-pipe" option) would render mysqld useless!# #skip-networking# Replication Master Server (def Ault) # Binary logging is required for replicationlog-bin=mysql-bin# binary logging format-mixed Recommendedbinlog_format =mixed# required Unique ID between 1 and 2^32-1# defaults to 1 if Master-host isn't set# but would not function as a Mas ter if Omittedserver-id = # Replication Slave (Comment out master sections to use this) # to configure this host as A replication slave, you can choose between# methods: # 1) Use the Change MASTER to command (fully described in our manual)-# the syntax is:## CHAN GE MASTER to Master_host=
　　
MySQL database localhost's root user login encountered failure