問題表象：
我的mysql中的 my.ini文件配置： www.2cto.com
[csharp]
#Path to installation directory. All paths are usually resolved relative to this.
basedir="D:/software_builder/mysql/"
#Path to the database root
datadir="C:/ProgramData/MySQL/MySQL Server 5.5/Data/"
我在 datadir的路徑下找到.err文件，查看錯誤原因 www.2cto.com
[html]
121022 15:21:06 [Note] Plugin 'FEDERATED' is disabled.
D:\software_builder\mysql\bin\mysqld: Table 'mysql.plugin' doesn't exist
121022 15:21:06 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
121022 15:21:06 InnoDB: The InnoDB memory heap is disabled
121022 15:21:06 InnoDB: Mutexes and rw_locks use Windows interlocked functions
121022 15:21:06 InnoDB: Compressed tables use zlib 1.2.3
121022 15:21:06 InnoDB: Initializing buffer pool, size = 500.0M
121022 15:21:06 InnoDB: Completed initialization of buffer pool
121022 15:21:06 InnoDB: Log file .\ib_logfile0 did not exist: new to be created
InnoDB: Setting log file .\ib_logfile0 size to 100 MB
InnoDB: Database physically writes the file full: wait...
InnoDB: Progress in MB: 100
121022 15:21:07 InnoDB: Log file .\ib_logfile1 did not exist: new to be created
InnoDB: Setting log file .\ib_logfile1 size to 100 MB
InnoDB: Database physically writes the file full: wait...
InnoDB: Progress in MB: 100
121022 15:21:10 InnoDB: highest supported file format is Barracuda.
InnoDB: The log sequence number in ibdata files does not match
InnoDB: the log sequence number in the ib_logfiles!
121022 15:21:10 InnoDB: Database was not shut down normally!
InnoDB: Starting crash recovery.
InnoDB: Reading tablespace information from the .ibd files...
InnoDB: Restoring possible half-written data pages from the doublewrite
InnoDB: buffer...
121022 15:21:10 InnoDB: Waiting for the background threads to start
121022 15:21:11 InnoDB: 1.1.8 started; log sequence number 3700748
121022 15:21:11 [ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist
嘗試過無數種網絡搜索的解決方法，有過重裝mysql的念頭，也有過砸電腦的沖動，但最後還是天不負有心人，終於找到了解決方法； www.2cto.com
第一步：在mysql的安裝目錄下 basedir="D:/software_builder/mysql/的data文件夾裡“D:\software_builder\mysql\data”" 下面還有一個mysql的文件夾（如圖），
把“mysql文件夾”拷貝到數據庫的數據存放位置的data文件夾下（我的是：C:\ProgramData\MySQL\MySQL Server 5.5\data） www.2cto.com
然後在服務裡面啟動mysql服務，結果：“I get it ！”
