SQL SERVER 如何修改数据库文件路径

DECLARE @DBNAME VARCHAR(255)
 DECLARE @TargetPath VARCHAR(255)
 DECLARE @CmdCommand VARCHAR(2000)

SET @DBNAME=‘GTN_New2019‘
 SET @TargetPath=‘D:\MyDB‘

--第一步:设置数据库脱机
SET @CmdCommand= ‘ALTER DATABASE ‘+@DBNAME+‘ SET OFFLINE‘
 EXEC(@CmdCommand)

--第二步：物理拷贝数据库文件到新目录
DECLARE @FileName VARCHAR(255)
 DECLARE @SourceFullName VARCHAR(255)
 DECLARE FileCur CURSOR for SELECT name,physical_name from sys.master_files where database_id=db_id(@DBNAME)
 OPEN FileCur
 FETCH NEXT FROM FileCur INTO @FileName,@SourceFullName
 WHILE @@FETCH_STATUS=0
 BEGIN
  SET @CmdCommand= ‘copy "‘+@SourceFullName+‘" "‘+@TargetPath+‘"‘
  EXEC master..xp_cmdshell @CmdCommand
  
  --修改数据库文件的路径指向新目录
 SET @CmdCommand=‘ALTER DATABASE ‘+@DBNAME+‘ MODIFY FILE(FILENAME=‘‘‘+@TargetPath+CASE WHEN RIGHT(@TargetPath,1)=‘\‘THEN‘‘ ELSE‘\‘ END+
   RIGHT(@SourceFullName, CHARINDEX(‘\‘, REVERSE(@SourceFullName))-1)+‘‘‘,name=‘‘‘+@FileName+‘‘‘)‘
  EXEC(@CmdCommand)
  FETCH NEXT FROM FileCur INTO @FileName,@SourceFullName
 END
 CLOSE FileCur
 DEALLOCATE FileCur

--第三步：设置数据库联机
SET @CmdCommand= ‘ALTER DATABASE ‘+@DBNAME+‘ SET ONLINE‘
 EXEC(@CmdCommand)