/*插入一个admin用户 */
insert into mysql.user()
insert into mysql.user(Host,User,Password,ssl_cipher,x509_issuer,x509_subject) values('localhost','admin','admin','','','');               

/*更新 */
update mysql.user set Host='localhost',select_priv='y', insert_priv='y',update_priv='y', Alter_priv='y',delete_priv='y',create_priv='y',drop_priv='y',reload_priv='y',shutdown_priv='y',Process_priv='y',file_priv='y',grant_priv='y',References_priv='y',index_priv='y',create_user_priv='y',show_db_priv='y',super_priv='y',create_tmp_table_priv='y',Lock_tables_priv='y',execute_priv='y',repl_slave_priv='y',repl_client_priv='y',create_view_priv='y',show_view_priv='y',create_routine_priv='y',alter_routine_priv='y',create_user_priv='y' where user='admin';                               
/*授权*/

GRANT ALL PRIVILEGES ON *.* TO admin@localhost IDENTIFIED BY 
'admin' WITH GRANT OPTION;