問題表象：

我的mysql中的 my.ini文件配置：

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#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/"

#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

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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

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，但最后還是天不負有心人，終于找到了解決方法；

第一步：在mysql的安裝目錄下 basedir="D:/software_builder/mysql/的data文件夾里“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)

然后在服務里面啟動mysql服務，結果：“I get it ！”

總結

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