?王成辉翻译整理，转贴请注明出自微软BI开拓者
www.windbi.com
感谢楼上提供Bug，该Bug产生的原因可以参见http://sqlblog.com/blogs/kalen_delaney/archive/2006/12/09/411.aspx
呵呵，该blog是《SQL2000技术内幕》和《Microsoft.Press.Inside.Microsoft.SQL.Server.2005.The.Storage.Engine》的作者哦。
已经将该Bug修正了，请继续给予反馈和支持！，具体代码如下：
create PROCEDURE [dbo].[sp__windbi$decrypt]
(@procedure sysname = NULL,@revfl int = 1)
AS
/*
王成辉翻译整理，转贴请注明出自微软BI开拓者www.windbi.com
目前这个存储过程只能解密存储过程，至于解密函数、触发器、视图的存储过程本网站会进一步关注，调用形式为：
exec dbo.sp__windbi$decrypt @procedure,0
如果第二个参数使用1的话，会给出该存储过程的一些提示。
--版本3.0? 修正存储过程过长引起的问题
*/
SET NOCOUNT ON
IF @revfl = 1
BEGIN
PRINT '警告：该存储过程会删除并重建原始的存储过程。'
PRINT ' 在运行该存储过程之前确保你的数据库有一个备份。'
PRINT ' 该存储过程通常应该运行在产品环境的一个备份的非产品环境下。'
PRINT ' 为了运行这个存储过程，将参数@refl的值更改为0。'
RETURN 0
END
DECLARE @intProcSpace bigint,@t bigint,@maxColID smallint,@procNameLength int
select @maxColID = max(subobjid) FROM
sys.sysobjvalues WHERE objid = object_id(@procedure)
--select @maxColID as 'Rows in sys.sysobjvalues'
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(cast('-'as nvarchar(max)),datalength(@real_01) /2 - @procNameLength)
else if @objtype='FN'
? SET @fake_01='ALTER FUNCTION '+ @procedure +'() RETURNS INT WITH ENCRYPTION AS BEGIN RETURN 1
? /*'+REPLICATE(cast('*'as nvarchar(max)),datalength(@real_01) /2 - @procNameLength)+'*/ END'
else if @objtype='V'
? SET @fake_01='ALTER view '+ @procedure +' WITH ENCRYPTION AS select 1 as col
? /*'+REPLICATE(cast('*'as nvarchar(max)),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(cast('*'as nvarchar(max)),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(cast('-'as nvarchar(max)),datalength(@real_01) /2 - @procNameLength)
else if @objtype='FN'
? SET @fake_01='CREATE FUNCTION '+ @procedure +'() RETURNS INT WITH ENCRYPTION AS BEGIN RETURN 1
? /*'+REPLICATE(cast('*'as nvarchar(max)),datalength(@real_01) /2 - @procNameLength)+'*/ END'
else if @objtype='V'
? SET @fake_01='Create view '+ @procedure +' WITH ENCRYPTION AS select 1 as col
? /*'+REPLICATE(cast('*'as nvarchar(max)),datalength(@real_01) /2 - @procNameLength)+'*/'
else if @objtype='TR'
? SET @fake_01='Create trigger '+ @procedure +' ON '+@parentname+'WITH ENCRYPTION AFTER INSERT AS RAISERROR (''N'',10)? /*'+REPLICATE(cast('*'as nvarchar(max)),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(cast('A'as nvarchar(max)),(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_01,1)) ^(UNICODE(substring(@fake_01,1)) ^UNICODE(substring(@fake_encrypt_01,1)))))SET @intProcSpace=@intProcSpace+1END--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(max),@Line nvarchar(255)Select @DefinedLength = 255SELECT @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.sysobjvaluesDECLARE ms_crs_syscom CURSOR LOCALFOR SELECT real_decrypt from #outputORDER BY identFOR READ ONLY--获取文本SELECT @LFCR = 2SELECT @LineId = 1OPEN ms_crs_syscomFETCH NEXT FROM ms_crs_syscom into @SyscomTextWHILE @@fetch_status >= 0BEGINSELECT @BasePos = 1SELECT @CurrentPos = 1SELECT @TextLength = LEN(@SyscomText)WHILE @CurrentPos != 0BEGIN--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 != 0BEGIN--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) > @DefinedLengthBEGINSELECT @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 = 0ENDSELECT @Line = isnull(@Line,@CurrentPos-@BasePos + @LFCR),N'')SELECT @BasePos = @CurrentPos+2INSERT #CommentText VALUES( @LineId,@Line )SELECT @LineId = @LineId + 1SELECT @Line = NULLENDELSE--如果回车没找到BEGINIF @BasePos <= @TextLengthBEGIN--如果@Lines长度的新值大于定义的长度While (isnull(LEN(@Line),0) + @BlankSpaceAdded + @TextLength-@BasePos+1 ) > @DefinedLengthBEGINSELECT @AddOnLen = @DefinedLength - (isnull(LEN(@Line),@TextLength-@BasePos+1 ),N'')if LEN(@Line) < @DefinedLength and charindex(' ',@TextLength+1 ) > 0BEGINSELECT @Line = @Line + ' ',@BlankSpaceAdded = 1ENDENDENDENDFETCH NEXT FROM ms_crs_syscom into @SyscomTextENDIF @Line is NOT NULLINSERT #CommentText VALUES( @LineId,@Line )select Text from #CommentText order by LineIdCLOSE ms_crs_syscomDEALLOCATE ms_crs_syscomDROP 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 TRANDROP TABLE #output
（编辑：李大同）
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