（2期）數據庫還原（支持覆蓋數據庫、自動創建相關路徑）

/*********************************************************************************************
Function：數據庫還原(支持自動覆蓋現有數據庫及自動創建相關路徑)
Author：Bean
Date:2012-09-24
注：感謝“小愛”提供幫助
*********************************************************************************************/
use master
go
if OBJECT_ID('sp_restore','P') is not null drop proc sp_restore
go
create proc sp_restore
@dbName varchar(128),
@crtDBName varchar(128),
@fullDBSourcePath varchar(1024),
@dbStorePath varchar(1024)
as
Begin
	set nocount on
	declare @result int,							 --定義變量用來判斷文件是否存在
			@mdfPath varchar(1024),
			@ldfPath varchar(1024),
			@crtPath varchar(1024)
	--//把'/'替換成'\'
	set @fullDBSourcePath=REPLACE(@fullDBSourcePath,'/','\')
	set @dbStorePath=REPLACE(@dbStorePath,'/','\')
	--//得到mdf 和 ldf 生成文件地址
 	set @mdfPath=@dbStorePath+'\'+	@dbName+'.mdf'
	set @ldfPath=@dbStorePath+'\'+	@dbName+'.ldf'
	
	/*** 判斷路徑是否存在 ***/
	exec sp_configure 'show advanced options',1;reconfigure;
	exec sp_configure 'xp_cmdshell',1;reconfigure;
	set @crtPath='mkdir '+replace(@dbStorePath,' ','" "')
	--//創建路徑
	Exec master.dbo.xp_cmdshell @crtPath,NO_OUTPUT
	
	/*** 判斷數據庫是否存在 ***/
	if exists(select 1 from sys.databases where name =@dbName)
	Begin
		--//備份數據庫
		declare @filename varchar(1024)
		--獲取文件名
		set @fileName=@dbName+replace
							(replace
								(replace
									(CONVERT(varchar, getdate(), 120 )
									,'-','')
										,' ','')
											,':','')
					+'.bak'
		--開始備份
		exec
		(
			'backup database '+@dbName+' to disk='''+@dbStorePath+'\'+@fileName+''''
		)
		
		--//斷開連接
		exec
		(
			'alter database '+@dbName+' set single_user with rollback immediate'
		)
	End	
	/*** bak數據庫是否存在 ***/
	Exec master.dbo.xp_fileexist @fullDBSourcePath,@result out
	--如果存在
	if @result=1
	Begin
		exec(
			'restore database '+@dbName+
			' from disk= '''+@fullDBSourcePath+''''+
			' with replace ,
			       move '''+@crtDBName+''' to '''+@mdfPath+''','+
			     ' move '''+@crtDBName+'_log'''+' to '''+@ldfPath+''''
		)
	End
	Else 
	Begin
		RaisError('Can not find bak recourse from the Database Recourse Path.',16,1);
		Return;
	End
End
go
--測試腳本
--master.dbo.sp_restore 'XJTLU_04201','LANDAV8','D:\Data\bak\XJTLU_042020120911123443.bak','D:\Data'