如何迁移RDS中的加密存储过程

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 
BEGIN
DECLARE @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 imageval

select @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 #output
END

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。