1. 准备文件
?? mysql解压版? 下载地址ftp://ftp.iij.ad.jp/pub/db/mysql/Downloads/MySQL-5.5/mysql-5.5.22-win32.zip

2. 解压到本地目录
?? D:\devTools\mysql

3. 把添加系统环境变量
?? MYSQL_HOME? ==> D:\devTools\mysql? (新建)
?? Path??????????????? ==> ;%MYSQL_HOME%\bin? (追加)

4. 修改MySQL5.5的配置文件，把my-small.ini改名为my.ini进行编辑
?? a）在[mysqld]下追加
?? -------
?? basedir = "d:\\devTools\\mysql"
?? datadir = "d:\\devTools\\mysql\\data"
?? character-set-server = utf8
?? -------
?? b) 在[client]下追加
?? -------
?? default-character-set = utf8
?? -------

5. 保存my.ini的配置， 然后打开命令行（开始菜单==>运行==>cmd ）
?? 输入: mysqld --console 然后回车将看到如下类似内容:
?? -------
?? C:\Windows\system32>mysqld --console
?? 120410 14:25:22 [Note] Plugin 'FEDERATED' is disabled.
?? 120410 14:25:22 InnoDB: The InnoDB memory heap is disabled
?? 120410 14:25:22 InnoDB: Mutexes and rw_locks use Windows interlocked functions
?? 120410 14:25:22 InnoDB: Compressed tables use zlib 1.2.3
?? 120410 14:25:22 InnoDB: Initializing buffer pool, size = 128.0M
?? 120410 14:25:22 InnoDB: Completed initialization of buffer pool
?? 120410 14:25:22 InnoDB: highest supported file format is Barracuda.
?? 120410 14:25:22? InnoDB: Waiting for the background threads to start
?? 120410 14:25:23 InnoDB: 1.1.8 started; log sequence number 1595675
?? 120410 14:25:23 [Note] Event Scheduler: Loaded 0 events
?? 120410 14:25:23 [Note] mysqld: ready for connections.
?? Version: '5.5.22'? socket: ''? port: 3306? MySQL Community Server (GPL)
?? -------
?? ==> 证明mysql服务已启动

6. 设置登陆mysql root帐号的的密码
?? 打开新的命令行，输入 mysql -uroot 回车
?? -------
?? Welcome to the MySQL monitor.? Commands end with ; or \g.
?? Your MySQL connection id is 1
?? Server version: 5.5.22 MySQL Community Server (GPL)

?? Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.

?? Oracle is a registered trademark of Oracle Corporation and/or its
?? affiliates. Other names may be trademarks of their respective
?? owners.

?? Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
?? -------
?? ==〉看到上面类似内容说明登陆成功，此时的root帐号是没有密码的
?? 执行命令修改密码：

?

?? use mysql; ?

?? update user set password=PASSWORD("这里填写你要设置的密码") where user='root';

??
?? 执行完成后退出mysql操作,然后关闭mysql服务（ctrl+C 关闭另一个命令窗口），然后重启mysql服务

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初学者，如有疏漏，请多见谅