为什麽需要使用DAC连接？
1) 外围应用配置——启用DAC
EXEC SP_CONFIGURE 'remote admin connections', 1
GO
RECONFIGURE
GO
-----------------------------------------------------------------------------------
配置选项 'remote admin connections' 已从 1 更改为 1。请运行 RECONFIGURE 语句进行安装。
命令提示符配置
D:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\Binn>sqlcmd -
A -S 192.168.194.20 -U sa -P ******
1> exit
2) 断开所有连接，新进查询 Server 名称格式为 "ADMIN:Servername"
3) 查询以文本格式显示结果，执行解密存储过程 sp_decrypt
USE MyDB
GO
EXEC master.dbo.sp_decrypt 'dbo.encry_1', 0
GO
温馨提示，以下解密存储过程摘自网络....
-----------------------------------------------------------------------------------
USE [master]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
Create PROCEDURE [dbo].[sp_decrypt]
(@function sysname = NULL, @revfl int = 1)
AS
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,@intEncrypted
tinyint,@procNameLength int
select @maxColID = max(subobjid),@intEncrypted = p_w_picpathval FROM
sys.sysobjvalues WHERE objid = object_id(@function)
GROUP BY p_w_picpathval
--select @maxColID as 'Rows in sys.sysobjvalues'
select @procNameLength = datalength(@function) + 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)
select @real_decrypt_01a = ''
-- 从sys.sysobjvalues里提出加密的p_w_picpathval记录
SET @real_01=(SELECT p_w_picpathval FROM sys.sysobjvalues WHERE objid =
object_id(@function) and valclass = 1 and subobjid = 0 )
--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
SET @fake_01='ALTER FUNCTION '+ @function +'() RETURNS INT WITH ENCRYPTION AS BEGIN RETURN 1
/*'+REPLICATE('*', datalength(@real_01) /2 - @procNameLength)+'*/ END'
EXECUTE (@fake_01)
--从sys.sysobjvalues里提出加密的假的
SET @fake_encrypt_01=(SELECT p_w_picpathval FROM sys.sysobjvalues WHERE objid =
object_id(@function) and valclass = 1 and subobjid = 0)
SET @fake_01='CREATE FUNCTION '+ @function +'() RETURNS INT WITH ENCRYPTION AS BEGIN RETURN 1
/*'+REPLICATE('*', datalength(@real_01) /2 - @procNameLength)+'*/ END'
--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
--版本1.1，重建不必要的存储过程
ROLLBACK TRAN
DROP TABLE #output
GO
-----------------------------------------------------------------------------------
