Jangogo : 
--查询用户库Data文件默认路径:
DECLARE @DefaultData VARCHAR(100)
EXEC master..xp_regread @rootkey='HKEY_LOCAL_MACHINE',
  @key='Software\Microsoft\Microsoft SQL Server\MSSQL10.SQL2008\MSSQLServer',
  @value_name='DefaultData',
  @DefaultData=@DefaultData OUTPUT
SELECT @DefaultData

--查询用户库Log文件默认路径:
DECLARE @DefaultLog VARCHAR(100)
EXEC master..xp_regread @rootkey='HKEY_LOCAL_MACHINE',
  @key='Software\Microsoft\Microsoft SQL Server\MSSQL10.SQL2008\MSSQLServer',
  @value_name='DefaultLog',
  @DefaultLog=@DefaultLog OUTPUT
SELECT @DefaultLog

--查询用户库备份文件默认路径:
DECLARE @BackupDirectory VARCHAR(100)
EXEC master..xp_regread @rootkey='HKEY_LOCAL_MACHINE',
  @key='Software\Microsoft\Microsoft SQL Server\MSSQL10.SQL2008\MSSQLServer',
  @value_name='BackupDirectory',
  @BackupDirectory=@BackupDirectory OUTPUT
SELECT @BackupDirectory


--修改用户库Data文件默认路径:
EXEC master..xp_regwrite
     @rootkey='HKEY_LOCAL_MACHINE',
     @key='Software\Microsoft\Microsoft SQL Server\MSSQL10.SQL2008\MSSQLServer',
     @value_name='DefaultData',
     @type='REG_SZ',
     @value='D:\SQL2008\Data'

--修改用户库Log文件默认路径:
EXEC master..xp_regwrite
     @rootkey='HKEY_LOCAL_MACHINE',
     @key='Software\Microsoft\Microsoft SQL Server\MSSQL10.SQL2008\MSSQLServer',
     @value_name='DefaultLog',
     @type='REG_SZ',
     @value='D:\SQL2008\Log'

--修改用户库备份文件默认路径:
EXEC master..xp_regwrite
     @rootkey='HKEY_LOCAL_MACHINE',
     @key='Software\Microsoft\Microsoft SQL Server\MSSQL10.SQL2008\MSSQLServer',
     @value_name='BackupDirectory',
     @type='REG_SZ',
     @value='D:\SQL2008\DBBak'
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