问题表象：
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的路径下找到.err文件，查看错误原因
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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
尝试过无数种网络搜索的解决方法，有过重装mysql的念头，也有过砸电脑的冲动，但最后还是天不负有心人，终于找到了解决方法；
第一步：在mysql的安装目录下 basedir="D:/software_builder/mysql/的data文件夹里“D:\software_builder\mysql\data”" 下面还有一个mysql的文件夹(如图)，
把“mysql文件夹”拷贝到数据库的数据存放位置的data文件夹下(我的是：C:\ProgramData\MySQL\MySQL Server 5.5\data)
然后在服务里面启动mysql服务，结果：“I get it ！”
