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='SoftwareMicrosoftMicrosoft SQL ServerMSSQL.1MSSQLServer',
@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='SoftwareMicrosoftMicrosoft SQL ServerMSSQL.1MSSQLServer',
@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='SoftwareMicrosoftMicrosoft SQL ServerMSSQL.1MSSQLServer',
@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='SoftwareMicrosoftMicrosoft SQL ServerMSSQL.1MSSQLServer',
@value_name='DefaultData',
@type='REG_SZ',
@value='D:SQL2005Data'

修改用户库Log文件默认路径：
EXEC master..xp_regwrite
@rootkey='HKEY_LOCAL_MACHINE',
@key='SoftwareMicrosoftMicrosoft SQL ServerMSSQL.1MSSQLServer',
@value_name='DefaultLog',
@type='REG_SZ',
@value='D:SQL2005Log'

修改用户库备份文件默认路径：
EXEC master..xp_regwrite
@rootkey='HKEY_LOCAL_MACHINE',
@key='SoftwareMicrosoftMicrosoft SQL ServerMSSQL.1MSSQLServer',
@value_name='BackupDirectory',
@type='REG_SZ',
@value='D:SQL2005DBBak'

代码如下:
Windows Server 2008 Standard Version -bit
SQL Server 2008 Standard Version -bit

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='SoftwareMicrosoftMicrosoft SQL ServerMSSQL10.SQL2008MSSQLServer',
@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='SoftwareMicrosoftMicrosoft SQL ServerMSSQL10.SQL2008MSSQLServer',
@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='SoftwareMicrosoftMicrosoft SQL ServerMSSQL10.SQL2008MSSQLServer',
@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='SoftwareMicrosoftMicrosoft SQL ServerMSSQL10.SQL2008MSSQLServer',
@value_name='DefaultData',
@type='REG_SZ',
@value='D:SQL2008Data'

修改用户库Log文件默认路径：
EXEC master..xp_regwrite
@rootkey='HKEY_LOCAL_MACHINE',
@key='SoftwareMicrosoftMicrosoft SQL ServerMSSQL10.SQL2008MSSQLServer',
@value_name='DefaultLog',
@type='REG_SZ',
@value='D:SQL2008Log'

修改用户库备份文件默认路径：
EXEC master..xp_regwrite
@rootkey='HKEY_LOCAL_MACHINE',
@key='SoftwareMicrosoftMicrosoft SQL ServerMSSQL10.SQL2008MSSQLServer',
@value_name='BackupDirectory',
@type='REG_SZ',
@value='D:SQL2008DBBak'