sql存储过程的解决方法

<p>CREATE TABLE [dbo].[SQL_DECODE](<br>    [ID] [int] IDENTITY(1,1) NOT NULL,<br>    [SQLTEXT] [nvarchar](max) NOT NULL,<br> CONSTRAINT [ID] PRIMARY KEY CLUSTERED <br>(<br>    [ID] ASC<br>)<br>) ON [PRIMARY]<br><br>GO</p>

<p>CREATE PROCEDURE [dbo].[DECODE_DATABASE]<br>AS<br>SET NOCOUNT ON<br>BEGIN<br><br>    DECLARE @PROC_NAME VARCHAR(256)<br>    SET @PROC_NAME = ''<br>    DECLARE @ROWS INT<br>    DECLARE @TEMP TABLE(<br>        NAME VARCHAR(256)<br>    )<br>    INSERT INTO @TEMP SELECT NAME FROM sysobjects WHERE TYPE = 'P' <br>    AND NAME NOT IN (<br>        'DECODE_DATABASE', 'DECODE_PROC'<br>    )<br>    SET @ROWS = @@ROWCOUNT<br>    WHILE @ROWS > 0<br>    BEGIN<br>        SELECT @PROC_NAME = NAME FROM (<br>            SELECT ROW_NUMBER() OVER (ORDER by NAME) AS ROW, NAME FROM @TEMP <br>        ) T <br>        WHERE ROW = @ROWS<br>        EXEC [DECODE_PROC] @PROC_NAME<br>        PRINT @PROC_NAME<br>        SET @ROWS = @ROWS - 1<br>    END<br>    <br>    RETURN<br>    <br>    EXEC master..xp_cmdshell 'bcp "SELECT [SQLTEXT] FROM TEST.dbo.[SQL_DECODE]" queryout C:decode.txt -c -T -S PC2011043012JUJ'<br>END<br><br><br>GO</p>

<p>CREATE PROCEDURE [dbo].[DECODE_PROC](<br>    @PROC_NAME SYSNAME = NULL<br>)<br>AS<br>SET NOCOUNT ON<br><br>DECLARE @PROC_NAME_LEN INT    --存储过程名长度<br>DECLARE @MAX_COL_ID SMALLINT    --最大列ID<br>SELECT @MAX_COL_ID = MAX(subobjid) FROM sys.sysobjvalues WHERE objid = OBJECT_ID(@PROC_NAME) GROUP BY imageval<br><br>SELECT @PROC_NAME_LEN = DATALENGTH(@PROC_NAME) + 29<br>DECLARE @REAL_01 NVARCHAR(MAX)    --真实加密存储过程数据<br>DECLARE @FACK_01 NVARCHAR(MAX)    --修改为假的存储过程，长度（40003 - 存在过程名长度），原理不明？<br>DECLARE @FACK_ENCRYPT_01 NVARCHAR(MAX)    --伪加密存储过街程数据<br>DECLARE @REAL_DECRYPT_01 NVARCHAR(MAX)    --最终解密后的数据，初始化为原始加密长度的一半的“A”，原理不明？<br><br>SET @REAL_01 = (<br>    SELECT imageval FROM sys.sysobjvalues WHERE objid = object_id(@PROC_NAME) AND valclass = 1 AND subobjid = 1<br>)<br><br>DECLARE @REAL_DATA_LEN BIGINT<br>SET @REAL_DATA_LEN = DATALENGTH(@REAL_01)<br>--PRINT @REAL_DATA_LEN<br><br>DECLARE @FACK_LEN BIGINT<br>SET @FACK_LEN = @REAL_DATA_LEN * 10    --改造：假的长度在原真实数据长度上放大10倍<br><br>--此处需将NVARCHAR显示转换成NVARCHAR(MAX)，不然将只能产生4K长度<br>SET @FACK_01 = 'ALTER PROCEDURE ' + @PROC_NAME + ' WITH ENCRYPTION AS ' + REPLICATE(CONVERT(NVARCHAR(MAX), '-'), @FACK_LEN - @PROC_NAME_LEN)<br>--PRINT '@FACK_01 = ' + STR(LEN(@FACK_01))<br>EXECUTE (@FACK_01)<br>SET @FACK_ENCRYPT_01 = (<br>    SELECT imageval FROM sys.sysobjvalues WHERE objid = object_id(@PROC_NAME) AND valclass = 1 AND subobjid = 1<br>)<br><br>SET @FACK_01 = 'CREATE PROCEDURE ' + @PROC_NAME + ' WITH ENCRYPTION AS ' + REPLICATE(CONVERT(VARCHAR(MAX), '-'), @FACK_LEN - @PROC_NAME_LEN)<br>SET @REAL_DECRYPT_01 = REPLICATE(CONVERT(NVARCHAR(MAX), N'A'), (DATALENGTH(@REAL_01) /2))<br>--PRINT 'LEN(@REAL_DECRYPT_01) = ' + STR(LEN(@REAL_DECRYPT_01))<br><br><br>--按位对 @REAL_01、 @FACK_01、 @REAL_DECRYPT_01 进行异或操作。<br>DECLARE @INT_PROC_SPACE BIGINT<br>SET @INT_PROC_SPACE = 1<br>WHILE @INT_PROC_SPACE <= (DATALENGTH(@REAL_01) /2 )<br>BEGIN<br>    SET @REAL_DECRYPT_01 = STUFF(<br>        @REAL_DECRYPT_01, <br>        @INT_PROC_SPACE, <br>        1, <br>        NCHAR(UNICODE(SUBSTRING(@REAL_01, @INT_PROC_SPACE, 1)) ^ (UNICODE(SUBSTRING(@FACK_01, @INT_PROC_SPACE, 1)) ^ UNICODE(SUBSTRING(@FACK_ENCRYPT_01, @INT_PROC_SPACE, 1))))<br>    )<br>    SET @INT_PROC_SPACE = @INT_PROC_SPACE + 1<br>END<br><br>--移除WITH ENCRYPTION<br>SET @REAL_DECRYPT_01 = REPLACE(@REAL_DECRYPT_01, 'WITH ENCRYPTION', '')<br>INSERT INTO [SQL_DECODE] VALUES (@REAL_DECRYPT_01)<br><br>--PRINT '@REAL_DECRYPT_01 = ' + @REAL_DECRYPT_01<br>--PRINT 'LEN(@REAL_DECRYPT_01) = ' + STR(LEN(@REAL_DECRYPT_01))<br><br>--删除原存储过程<br>SET @FACK_01 = 'DROP PROCEDURE ' + @PROC_NAME<br>EXEC(@FACK_01)<br><br>GO</p>

至此，解密全过程大功告成，命令行模式下运行：
>EXEC [DECODE_DATABASE]
>GO
在C盘根目录下，解密后的存储过程文本生成成功。
运行前别忘记打开xp_cmdshell使用权限，同打开DAC一样：


或者命令行模式下敲如下命令：
>sp_configure 'show advanced options',1
>reconfigure
>go
>sp_configure 'xp_cmdshell',1
>reconfigure
>go