如何迁移RDS中的加密存储过程

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1. 背景介绍

目前，迁移RDS SQL Server中的数据到其他RDS SQL Server时，使用DTS数据传输服务进行迁，无法将加密存储过程顺利迁出。加密的存储过程，无法script出其定义。

备注：
当您考虑加密数据库存储过程之前，建议先做一个备份。

2. 查看SQL Server中加密存储过程和函数的方法

1）在存储过程所在的数据库下，创建存储过程sp_decrypt (出自微软BI开拓者www.windbi.com)。 

create PROCEDURE [dbo].[sp_decrypt] (@procedure sysname = NULL) AS SET NOCOUNT ON BEGINDECLARE @intProcSpace bigint, @t bigint, @maxColID smallint,@intEncrypted tinyint,@procNameLength int select @maxColID = max(subobjid),@intEncrypted = imageval FROM sys.sysobjvalues WHERE objid = object_id(@procedure) GROUP BY imagevalselect @procNameLength = datalength(@procedure) + 29 DECLARE @real_01 nvarchar(max) DECLARE @fake_01 nvarchar(max) DECLARE @fake_encrypt_01 nvarchar(max) DECLARE @real_decrypt_01 nvarchar(max),@real_decrypt_01a nvarchar(max) declare @objtype varchar(2),@ParentName nvarchar(max) select @real_decrypt_01a = '' --提取对象的类型如是存储过程还是函数，如果是触发器，还要得到其父对象的名称 select @objtype=type,@parentname=object_name(parent_object_id) from sys.objects where [object_id]=object_id(@procedure) -- 从sys.sysobjvalues里提出加密的imageval记录 SET @real_01=(SELECT top 1 imageval FROM sys.sysobjvalues WHERE objid = object_id(@procedure) and valclass = 1 order by subobjid) --创建一个临时表 create table #output ( [ident] [int] IDENTITY (1, 1) NOT NULL , [real_decrypt] NVARCHAR(MAX) ) --开始一个事务，稍后回滚 BEGIN TRAN --更改原始的存储过程，用短横线替换 if @objtype='P' SET @fake_01='ALTER PROCEDURE '+ @procedure +' WITH ENCRYPTION AS '+REPLICATE('-', 40003 - @procNameLength) else if @objtype='FN' SET @fake_01='ALTER FUNCTION '+ @procedure +'() RETURNS INT WITH ENCRYPTION AS BEGIN RETURN 1 /*'+REPLICATE('*', datalength(@real_01) /2 - @procNameLength)+'*/ END' else if @objtype='V' SET @fake_01='ALTER view '+ @procedure +' WITH ENCRYPTION AS select 1 as col /*'+REPLICATE('*', datalength(@real_01) /2 - @procNameLength)+'*/' else if @objtype='TR' SET @fake_01='ALTER trigger '+ @procedure +' ON '+@parentname+'WITH ENCRYPTION AFTER INSERT AS RAISERROR (''N'',16,10) /*'+REPLICATE('*', datalength(@real_01) /2 - @procNameLength)+'*/' EXECUTE (@fake_01) --从sys.sysobjvalues里提出加密的假的 SET @fake_encrypt_01=(SELECT top 1 imageval FROM sys.sysobjvalues WHERE objid = object_id(@procedure) and valclass = 1 order by subobjid ) if @objtype='P' SET @fake_01='Create PROCEDURE '+ @procedure +' WITH ENCRYPTION AS '+REPLICATE('-', 40003 - @procNameLength) else if @objtype='FN' SET @fake_01='CREATE FUNCTION '+ @procedure +'() RETURNS INT WITH ENCRYPTION AS BEGIN RETURN 1 /*'+REPLICATE('*', datalength(@real_01) /2 - @procNameLength)+'*/ END' else if @objtype='V' SET @fake_01='Create view '+ @procedure +' WITH ENCRYPTION AS select 1 as col /*'+REPLICATE('*', datalength(@real_01) /2 - @procNameLength)+'*/' else if @objtype='TR' SET @fake_01='Create trigger '+ @procedure +' ON '+@parentname+'WITH ENCRYPTION AFTER INSERT AS RAISERROR (''N'',16,10) /*'+REPLICATE('*', datalength(@real_01) /2 - @procNameLength)+'*/' --开始计数 SET @intProcSpace=1 --使用字符填充临时变量 SET @real_decrypt_01 = replicate(N'A', (datalength(@real_01) /2 )) --循环设置每一个变量，创建真正的变量 --每次一个字节 SET @intProcSpace=1 --如有必要，遍历每个@real_xx变量并解密 WHILE @intProcSpace<=(datalength(@real_01)/2) BEGIN --真的和假的和加密的假的进行异或处理 SET @real_decrypt_01 = stuff(@real_decrypt_01, @intProcSpace, 1, NCHAR(UNICODE(substring(@real_01, @intProcSpace, 1)) ^ (UNICODE(substring(@fake_01, @intProcSpace, 1)) ^ UNICODE(substring(@fake_encrypt_01, @intProcSpace, 1))))) SET @intProcSpace=@intProcSpace+1 END --通过sp_helptext逻辑向表#output里插入变量 insert #output (real_decrypt) select @real_decrypt_01 -- select real_decrypt AS '#output chek' from #output --测试 -- ------------------------------------- --开始从sp_helptext提取 -- ------------------------------------- declare @dbname sysname ,@BlankSpaceAdded int ,@BasePos int ,@CurrentPos int ,@TextLength int ,@LineId int ,@AddOnLen int ,@LFCR int --回车换行的长度 ,@DefinedLength int ,@SyscomText nvarchar(4000) ,@Line nvarchar(255) Select @DefinedLength = 255 SELECT @BlankSpaceAdded = 0 --跟踪行结束的空格。注意Len函数忽略了多余的空格 CREATE TABLE #CommentText (LineId int ,Text nvarchar(255) collate database_default) --使用#output代替sys.sysobjvalues DECLARE ms_crs_syscom CURSOR LOCAL FOR SELECT real_decrypt from #output ORDER BY ident FOR READ ONLY --获取文本 SELECT @LFCR = 2 SELECT @LineId = 1 OPEN ms_crs_syscom FETCH NEXT FROM ms_crs_syscom into @SyscomText WHILE @@fetch_status >= 0 BEGIN SELECT @BasePos = 1 SELECT @CurrentPos = 1 SELECT @TextLength = LEN(@SyscomText) WHILE @CurrentPos != 0 BEGIN --通过回车查找行的结束 SELECT @CurrentPos = CHARINDEX(char(13)+char(10), @SyscomText, @BasePos) --如果找到回车 IF @CurrentPos != 0 BEGIN --如果@Lines的长度的新值比设置的大就插入@Lines目前的内容并继续 While (isnull(LEN(@Line),0) + @BlankSpaceAdded + @CurrentPos-@BasePos + @LFCR) > @DefinedLength BEGIN SELECT @AddOnLen = @DefinedLength-(isnull(LEN(@Line),0) + @BlankSpaceAdded) INSERT #CommentText VALUES ( @LineId, isnull(@Line, N'') + isnull(SUBSTRING(@SyscomText, @BasePos, @AddOnLen), N'')) SELECT @Line = NULL, @LineId = @LineId + 1, @BasePos = @BasePos + @AddOnLen, @BlankSpaceAdded = 0 END SELECT @Line = isnull(@Line, N'') + isnull(SUBSTRING(@SyscomText, @BasePos, @CurrentPos-@BasePos + @LFCR), N'') SELECT @BasePos = @CurrentPos+2 INSERT #CommentText VALUES( @LineId, @Line ) SELECT @LineId = @LineId + 1 SELECT @Line = NULL END ELSE --如果回车没找到 BEGIN IF @BasePos <= @TextLength BEGIN --如果@Lines长度的新值大于定义的长度 While (isnull(LEN(@Line),0) + @BlankSpaceAdded + @TextLength-@BasePos+1 ) > @DefinedLength BEGIN SELECT @AddOnLen = @DefinedLength - (isnull(LEN(@Line),0) + @BlankSpaceAdded) INSERT #CommentText VALUES ( @LineId, isnull(@Line, N'') + isnull(SUBSTRING(@SyscomText, @BasePos, @AddOnLen), N'')) SELECT @Line = NULL, @LineId = @LineId + 1, @BasePos = @BasePos + @AddOnLen, @BlankSpaceAdded = 0 END SELECT @Line = isnull(@Line, N'') + isnull(SUBSTRING(@SyscomText, @BasePos, @TextLength-@BasePos+1 ), N'') if LEN(@Line) < @DefinedLength and charindex(' ', @SyscomText, @TextLength+1 ) > 0 BEGIN SELECT @Line = @Line + ' ', @BlankSpaceAdded = 1 END END END END FETCH NEXT FROM ms_crs_syscom into @SyscomText END IF @Line is NOT NULL INSERT #CommentText VALUES( @LineId, @Line ) select Text from #CommentText order by LineId CLOSE ms_crs_syscom DEALLOCATE ms_crs_syscom DROP TABLE #CommentText -- ------------------------------------- --结束从sp_helptext提取 -- ------------------------------------- --删除用短横线创建的存储过程并重建原始的存储过程 ROLLBACK TRAN DROP TABLE #outputEND

2) DAC连接SQL Server
确认SQL Server实例是否支持DAC连接：

SELECT *  FROM sys.configurations where name = 'remote admin connections'--value为1，说明允许DAC连接--value为0，按照下面方式设置允许DAC连接USE master        GO        sp_configure 'show advanced options', 1 GO    sp_configure 'remote admin connections', 1 GO        RECONFIGURE WITH OVERRIDE    GO

sqlcmd方式连接实例 ：
sqlcmd -A -S servername  -E

3)切换到用户数据库
Use DBNAME

4)执行解密存储过程
sp_decrypt  EncryptSP
Go
显示结果
3. 迁移RDS中的存储过程到本地自建库和其他RDS实例

RDS上面不支持DAC连接，需要把备份集下载到本地还原，然后使用2中的方法，导出加密存储过程的定义。

若是需要RDS之间迁移加密存储过程，RDS SQL Server 2008 R2之间可以还原备份集，其他版本的RDS SQL Server需要先将备份集还原到本地自建库，然后使用2中方法解密存储过程，再将存储过程定义导入目的RDS中。

备注：

RDS SQL Server 各个版本，可以在RDS控制台，备份恢复中下载备份集。

想不想知道是什么