恢复SQL Server被误删除的数据
恢复SQL Server被误删除的数据
地址：http://www.cnblogs.com/lyhabc/p/4620764.html
曾经想实现Log Explorer for SQL Server的功能，利用ldf里面的日志来还原误删除的数据
这里有一篇文章做到了，不过似乎不是所有的数据类型都支持
以下为译文：http://raresql.com/2011/10/22/how-to-recover-deleted-data-from-sql-sever/
在我使用SQLSERVER的这些年里面，大部分人都会问我一个问题：“能不能恢复被删除的数据？？”
现在，从SQLSERVER2005 或以上版本能很容易能够恢复被删除的数据
（注意：这个脚本能恢复下面的数据类型的数据 而且兼容CS 排序规则）
- image
- text
- uniqueidentifier
- tinyint
- smallint
- int
- smalldatetime
- real
- money
- datetime
- float
- sql_variant
- ntext
- bit
- decimal
- numeric
- smallmoney
- bigint
- varbinary
- varchar
- binary
- char
- timestamp
- nvarchar
- nchar
- xml
- sysname
让我来用demo来解释一下我是怎么做到的
- USE master
- GO
- --创建数据库
- CREATE DATABASE test
- GO
- USE [test]
- GO
- --创建表
- CREATE TABLE [dbo].[aa](
- [id] [int] IDENTITY(1,1) NOT NULL,
- [NAME] [nvarchar](200) NULL
- ) ON [PRIMARY]
- GO
- --插入测试数据
- INSERT [dbo].[aa]
- ( [NAME] )
- SELECT '你好'
- GO
- --删除数据
- Delete from aa
- Go
- --验证数据是否已经删除
- Select * from aa
- Go
现在你需要创建一个存储过程来恢复你的数据
- -- Script Name: Recover_Deleted_Data_Proc
- -- Script Type : Recovery Procedure
- -- Develop By: Muhammad Imran
- -- Date Created: 15 Oct 2011
- -- Modify Date: 22 Aug 2012
- -- Version : 3.1
- -- Notes : Included BLOB data types for recovery.& Compatibile with Default , CS collation , Arabic_CI_AS.
- CREATE PROCEDURE Recover_Deleted_Data_Proc
- @Database_Name NVARCHAR(MAX) ,
- @SchemaName_n_TableName NVARCHAR(MAX) ,
- @Date_From DATETIME = '1900/01/01' ,
- @Date_To DATETIME = '9999/12/31'
- AS
- DECLARE @RowLogContents VARBINARY(8000)
- DECLARE @TransactionID NVARCHAR(MAX)
- DECLARE @AllocUnitID BIGINT
- DECLARE @AllocUnitName NVARCHAR(MAX)
- DECLARE @SQL NVARCHAR(MAX)
- DECLARE @Compatibility_Level INT
- SELECT @Compatibility_Level = dtb.compatibility_level
- FROM master.sys.databases AS dtb
- WHERE dtb.name = @Database_Name
- IF ISNULL(@Compatibility_Level, 0) <= 80
- BEGIN
- RAISERROR('The compatibility level should be equal to or greater SQL SERVER 2005 (90)',16,1)
- RETURN
- END
- IF ( SELECT COUNT(*)
- FROM INFORMATION_SCHEMA.TABLES
- WHERE [TABLE_SCHEMA] + '.' + [TABLE_NAME] = @SchemaName_n_TableName
- ) = 0
- BEGIN
- RAISERROR('Could not found the table in the defined database',16,1)
- RETURN
- END
- DECLARE @bitTable TABLE
- (
- [ID] INT ,
- [Bitvalue] INT
- )
- --Create table to set the bit position of one byte.
- INSERT INTO @bitTable
- SELECT 0 ,
- 2
- UNION ALL
- SELECT 1 ,
- 2
- UNION ALL
- SELECT 2 ,
- 4
- UNION ALL
- SELECT 3 ,
- 8
- UNION ALL
- SELECT 4 ,
- 16
- UNION ALL
- SELECT 5 ,
- 32
- UNION ALL
- SELECT 6 ,
- 64
- UNION ALL
- SELECT 7 ,
- 128
- --Create table to collect the row data.
- DECLARE @DeletedRecords TABLE
- (
- [Row ID] INT IDENTITY(1, 1) ,
- [RowLogContents] VARBINARY(8000) ,
- [AllocUnitID] BIGINT ,
- [Transaction ID] NVARCHAR(MAX) ,
- [FixedLengthData] SMALLINT ,
- [TotalNoOfCols] SMALLINT ,
- [NullBitMapLength] SMALLINT ,
- [NullBytes] VARBINARY(8000) ,
- [TotalNoofVarCols] SMALLINT ,
- [ColumnOffsetArray] VARBINARY(8000) ,
- [VarColumnStart] SMALLINT ,
- [Slot ID] INT ,
- [NullBitMap] VARCHAR(MAX)
- )
- --Create a common table expression to get all the row data plus how many bytes we have for each row.
- ;
- WITH RowData
- AS ( SELECT [RowLog Contents 0] AS [RowLogContents] ,
- [AllocUnitID] AS [AllocUnitID] ,
- [Transaction ID] AS [Transaction ID]
- --[Fixed Length Data] = Substring (RowLog content 0, Status Bit A+ Status Bit B + 1,2 bytes)
- ,
- CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0],
- 2 + 1, 2)))) AS [FixedLengthData] --@FixedLengthData
- -- [TotalnoOfCols] = Substring (RowLog content 0, [Fixed Length Data] + 1,2 bytes)
- ,
- CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0],
- CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0],
- 2 + 1, 2)))) + 1,
- 2)))) AS [TotalNoOfCols]
- --[NullBitMapLength]=ceiling([Total No of Columns] /8.0)
- ,
- CONVERT(INT, CEILING(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0],
- CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0],
- 2 + 1, 2)))) + 1,
- 2)))) / 8.0)) AS [NullBitMapLength]
- --[Null Bytes] = Substring (RowLog content 0, Status Bit A+ Status Bit B + [Fixed Length Data] +1, [NullBitMapLength] )
- ,
- SUBSTRING([RowLog Contents 0],
- CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0],
- 2 + 1, 2)))) + 3,
- CONVERT(INT, CEILING(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0],
- CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0],
- 2 + 1, 2)))) + 1,
- 2)))) / 8.0))) AS [NullBytes]
- --[TotalNoofVarCols] = Substring (RowLog content 0, Status Bit A+ Status Bit B + [Fixed Length Data] +1, [Null Bitmap length] + 2 )
- ,
- ( CASE WHEN SUBSTRING([RowLog Contents 0], 1, 1) IN (
- 0x10, 0x30, 0x70 )
- THEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0],
- CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0],
- 2 + 1, 2)))) + 3
- + CONVERT(INT, CEILING(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0],
- CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0],
- 2 + 1, 2)))) + 1,
- 2)))) / 8.0)), 2))))
- ELSE NULL
- END ) AS [TotalNoofVarCols]
- --[ColumnOffsetArray]= Substring (RowLog content 0, Status Bit A+ Status Bit B + [Fixed Length Data] +1, [Null Bitmap length] + 2 , [TotalNoofVarCols]*2 )
- ,
- ( CASE WHEN SUBSTRING([RowLog Contents 0], 1, 1) IN (
- 0x10, 0x30, 0x70 )
- THEN SUBSTRING([RowLog Contents 0],
- CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0],
- 2 + 1, 2)))) + 3
- + CONVERT(INT, CEILING(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0],
- CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0],
- 2 + 1, 2)))) + 1,
- 2)))) / 8.0))
- + 2,
- ( CASE WHEN SUBSTRING([RowLog Contents 0],
- 1, 1) IN ( 0x10,
- 0x30, 0x70 )
- THEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0],
- CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0],
- 2 + 1, 2)))) + 3
- + CONVERT(INT, CEILING(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0],
- CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0],
- 2 + 1, 2)))) + 1,
- 2)))) / 8.0)), 2))))
- ELSE NULL
- END ) * 2)
- ELSE NULL
- END ) AS [ColumnOffsetArray]
- -- Variable column Start = Status Bit A+ Status Bit B + [Fixed Length Data] + [Null Bitmap length] + 2+([TotalNoofVarCols]*2)
- ,
- CASE WHEN SUBSTRING([RowLog Contents 0], 1, 1) IN (
- 0x10, 0x30, 0x70 )
- THEN ( CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0],
- 2 + 1, 2)))) + 4
- + CONVERT(INT, CEILING(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0],
- CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0],
- 2 + 1, 2)))) + 1,
- 2)))) / 8.0))
- + ( ( CASE WHEN SUBSTRING([RowLog Contents 0],
- 1, 1) IN ( 0x10,
- 0x30, 0x70 )
- THEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0],
- CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0],
- 2 + 1, 2)))) + 3
- + CONVERT(INT, CEILING(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0],
- CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0],
- 2 + 1, 2)))) + 1,
- 2)))) / 8.0)), 2))))
- ELSE NULL
- END ) * 2 ) )
- ELSE NULL
- END AS [VarColumnStart] ,
- [Slot ID]
- FROM sys.fn_dblog(NULL, NULL)
- WHERE AllocUnitId IN (
- SELECT [Allocation_unit_id]
- FROM sys.allocation_units allocunits
- INNER JOIN sys.partitions partitions ON ( allocunits.type IN (
- 1, 3 )
- AND partitions.hobt_id = allocunits.container_id
- )
- OR ( allocunits.type = 2
- AND partitions.partition_id = allocunits.container_id
- )
- WHERE object_id = OBJECT_ID(''
- + @SchemaName_n_TableName
- + '') )
- AND Context IN ( 'LCX_MARK_AS_GHOST', 'LCX_HEAP' )
- AND Operation IN ( 'LOP_DELETE_ROWS' )
- AND SUBSTRING([RowLog Contents 0], 1, 1) IN ( 0x10,
- 0x30, 0x70 )
- /*Use this subquery to filter the date*/
- AND [TRANSACTION ID] IN (
- SELECT DISTINCT
- [TRANSACTION ID]
- FROM sys.fn_dblog(NULL, NULL)
- WHERE Context IN ( 'LCX_NULL' )
- AND Operation IN ( 'LOP_BEGIN_XACT' )
- AND [Transaction Name] IN ( 'DELETE',
- 'user_transaction' )
- AND CONVERT(NVARCHAR(11), [Begin Time]) BETWEEN @Date_From
- AND
- @Date_To )
- ),
- --Use this technique to repeate the row till the no of bytes of the row.
- N1 ( n )
- AS ( SELECT 1
- UNION ALL
- SELECT 1
- ),
- N2 ( n )
- AS ( SELECT 1
- FROM N1 AS X ,
- N1 AS Y
- ),
- N3 ( n )
- AS ( SELECT 1
- FROM N2 AS X ,
- N2 AS Y
- ),
- N4 ( n )
- AS ( SELECT ROW_NUMBER() OVER ( ORDER BY X.n )
- FROM N3 AS X ,
- N3 AS Y
- )
- INSERT INTO @DeletedRecords
- SELECT RowLogContents ,
- [AllocUnitID] ,
- [Transaction ID] ,
- [FixedLengthData] ,
- [TotalNoOfCols] ,
- [NullBitMapLength] ,
- [NullBytes] ,
- [TotalNoofVarCols] ,
- [ColumnOffsetArray] ,
- [VarColumnStart] ,
- [Slot ID]
- ---Get the Null value against each column (1 means null zero means not null)
- ,
- [NullBitMap] = ( REPLACE(STUFF(( SELECT
- ','
- + ( CASE
- WHEN [ID] = 0
- THEN CONVERT(NVARCHAR(1), ( SUBSTRING(NullBytes,
- n, 1) % 2 ))
- ELSE CONVERT(NVARCHAR(1), ( ( SUBSTRING(NullBytes,
- n, 1)
- / [Bitvalue] )
- % 2 ))
- END ) --as [nullBitMap]
- FROM N4 AS Nums
- JOIN RowData AS C ON n <= NullBitMapLength
- CROSS JOIN @bitTable
- WHERE
- C.[RowLogContents] = D.[RowLogContents]
- ORDER BY [RowLogContents] ,
- n ASC
- FOR
- XML PATH('')
- ), 1, 1, ''), ',', '') )
- FROM RowData D
- IF ( SELECT COUNT(*)
- FROM @DeletedRecords
- ) = 0
- BEGIN
- RAISERROR('There is no data in the log as per the search criteria',16,1)
- RETURN
- END
- DECLARE @ColumnNameAndData TABLE
- (
- [Row ID] INT ,
- [Rowlogcontents] VARBINARY(MAX) ,
- [NAME] SYSNAME ,
- [nullbit] SMALLINT ,
- [leaf_offset] SMALLINT ,
- [length] SMALLINT ,
- [system_type_id] TINYINT ,
- [bitpos] TINYINT ,
- [xprec] TINYINT ,
- [xscale] TINYINT ,
- [is_null] INT ,
- [Column value Size] INT ,
- [Column Length] INT ,
- [hex_Value] VARBINARY(MAX) ,
- [Slot ID] INT ,
- [Update] INT
- )
- --Create common table expression and join it with the rowdata table
- -- to get each column details
- /*This part is for variable data columns*/
- --@RowLogContents,
- --(col.columnOffValue - col.columnLength) + 1,
- --col.columnLength
- --)
- INSERT INTO @ColumnNameAndData
- SELECT [Row ID] ,
- Rowlogcontents ,
- NAME ,
- cols.leaf_null_bit AS nullbit ,
- leaf_offset ,
- ISNULL(syscolumns.length, cols.max_length) AS [length] ,
- cols.system_type_id ,
- cols.leaf_bit_position AS bitpos ,
- ISNULL(syscolumns.xprec, cols.precision) AS xprec ,
- ISNULL(syscolumns.xscale, cols.scale) AS xscale ,
- SUBSTRING([nullBitMap], cols.leaf_null_bit, 1) AS is_null ,
- ( CASE WHEN leaf_offset < 1
- AND SUBSTRING([nullBitMap], cols.leaf_null_bit,
- 1) = 0
- THEN ( CASE WHEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * leaf_offset
- * -1 ) - 1, 2)))) > 30000
- THEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * leaf_offset
- * -1 ) - 1, 2))))
- - POWER(2, 15)
- ELSE CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * leaf_offset
- * -1 ) - 1, 2))))
- END )
- END ) AS [Column value Size] ,
- ( CASE WHEN leaf_offset < 1
- AND SUBSTRING([nullBitMap], cols.leaf_null_bit,
- 1) = 0
- THEN ( CASE WHEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * leaf_offset
- * -1 ) - 1, 2)))) > 30000
- AND ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * ( ( leaf_offset
- * -1 ) - 1 ) )
- - 1, 2)))), 0),
- [varColumnStart]) < 30000
- THEN ( CASE WHEN [System_type_id] IN (
- 35, 34, 99 ) THEN 16
- ELSE 24
- END )
- WHEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * leaf_offset
- * -1 ) - 1, 2)))) > 30000
- AND ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * ( ( leaf_offset
- * -1 ) - 1 ) )
- - 1, 2)))), 0),
- [varColumnStart]) > 30000
- THEN ( CASE WHEN [System_type_id] IN (
- 35, 34, 99 ) THEN 16
- ELSE 24
- END ) --24
- WHEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * leaf_offset
- * -1 ) - 1, 2)))) < 30000
- AND ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * ( ( leaf_offset
- * -1 ) - 1 ) )
- - 1, 2)))), 0),
- [varColumnStart]) < 30000
- THEN ( CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * leaf_offset
- * -1 ) - 1, 2))))
- - ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * ( ( leaf_offset
- * -1 ) - 1 ) )
- - 1, 2)))), 0),
- [varColumnStart]) )
- WHEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * leaf_offset
- * -1 ) - 1, 2)))) < 30000
- AND ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * ( ( leaf_offset
- * -1 ) - 1 ) )
- - 1, 2)))), 0),
- [varColumnStart]) > 30000
- THEN POWER(2, 15)
- + CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * leaf_offset
- * -1 ) - 1, 2))))
- - ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * ( ( leaf_offset
- * -1 ) - 1 ) )
- - 1, 2)))), 0),
- [varColumnStart])
- END )
- END ) AS [Column Length] ,
- ( CASE WHEN SUBSTRING([nullBitMap], cols.leaf_null_bit, 1) = 1
- THEN NULL
- ELSE SUBSTRING(Rowlogcontents,
- ( ( CASE WHEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * leaf_offset
- * -1 ) - 1, 2)))) > 30000
- THEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * leaf_offset
- * -1 ) - 1, 2))))
- - POWER(2, 15)
- ELSE CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * leaf_offset
- * -1 ) - 1, 2))))
- END )
- - ( CASE WHEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * leaf_offset
- * -1 ) - 1, 2)))) > 30000
- AND ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * ( ( leaf_offset
- * -1 ) - 1 ) )
- - 1, 2)))), 0),
- [varColumnStart]) < 30000
- THEN ( CASE
- WHEN [System_type_id] IN (
- 35, 34, 99 )
- THEN 16
- ELSE 24
- END ) --24
- WHEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * leaf_offset
- * -1 ) - 1, 2)))) > 30000
- AND ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * ( ( leaf_offset
- * -1 ) - 1 ) )
- - 1, 2)))), 0),
- [varColumnStart]) > 30000
- THEN ( CASE
- WHEN [System_type_id] IN (
- 35, 34, 99 )
- THEN 16
- ELSE 24
- END ) --24
- WHEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * leaf_offset
- * -1 ) - 1, 2)))) < 30000
- AND ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * ( ( leaf_offset
- * -1 ) - 1 ) )
- - 1, 2)))), 0),
- [varColumnStart]) < 30000
- THEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * leaf_offset
- * -1 ) - 1, 2))))
- - ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * ( ( leaf_offset
- * -1 ) - 1 ) )
- - 1, 2)))), 0),
- [varColumnStart])
- WHEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * leaf_offset
- * -1 ) - 1, 2)))) < 30000
- AND ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * ( ( leaf_offset
- * -1 ) - 1 ) )
- - 1, 2)))), 0),
- [varColumnStart]) > 30000
- THEN POWER(2, 15)
- + CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * leaf_offset
- * -1 ) - 1, 2))))
- - ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * ( ( leaf_offset
- * -1 ) - 1 ) )
- - 1, 2)))), 0),
- [varColumnStart])
- END ) ) + 1,
- ( CASE WHEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * leaf_offset
- * -1 ) - 1, 2)))) > 30000
- AND ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * ( ( leaf_offset
- * -1 ) - 1 ) )
- - 1, 2)))), 0),
- [varColumnStart]) < 30000
- THEN ( CASE WHEN [System_type_id] IN (
- 35, 34, 99 )
- THEN 16
- ELSE 24
- END ) --24
- WHEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * leaf_offset
- * -1 ) - 1, 2)))) > 30000
- AND ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * ( ( leaf_offset
- * -1 ) - 1 ) )
- - 1, 2)))), 0),
- [varColumnStart]) > 30000
- THEN ( CASE WHEN [System_type_id] IN (
- 35, 34, 99 )
- THEN 16
- ELSE 24
- END ) --24
- WHEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * leaf_offset
- * -1 ) - 1, 2)))) < 30000
- AND ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * ( ( leaf_offset
- * -1 ) - 1 ) )
- - 1, 2)))), 0),
- [varColumnStart]) < 30000
- THEN ABS(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * leaf_offset
- * -1 ) - 1, 2))))
- - ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * ( ( leaf_offset
- * -1 ) - 1 ) )
- - 1, 2)))), 0),
- [varColumnStart]))
- WHEN CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * leaf_offset
- * -1 ) - 1, 2)))) < 30000
- AND ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * ( ( leaf_offset
- * -1 ) - 1 ) )
- - 1, 2)))), 0),
- [varColumnStart]) > 30000
- THEN POWER(2, 15)
- + CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * leaf_offset
- * -1 ) - 1, 2))))
- - ISNULL(NULLIF(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([ColumnOffsetArray],
- ( 2
- * ( ( leaf_offset
- * -1 ) - 1 ) )
- - 1, 2)))), 0),
- [varColumnStart])
- END ))
- END ) AS hex_Value ,
- [Slot ID] ,
- 0
- FROM @DeletedRecords A
- INNER JOIN sys.allocation_units allocunits ON A.[AllocUnitId] = allocunits.[Allocation_Unit_Id]
- INNER JOIN sys.partitions partitions ON ( allocunits.type IN (
- 1, 3 )
- AND partitions.hobt_id = allocunits.container_id
- )
- OR ( allocunits.type = 2
- AND partitions.partition_id = allocunits.container_id
- )
- INNER JOIN sys.system_internals_partition_columns cols ON cols.partition_id = partitions.partition_id
- LEFT OUTER JOIN syscolumns ON syscolumns.id = partitions.object_id
- AND syscolumns.colid = cols.partition_column_id
- WHERE leaf_offset < 0
- UNION
- /*This part is for fixed data columns*/
- SELECT [Row ID] ,
- Rowlogcontents ,
- NAME ,
- cols.leaf_null_bit AS nullbit ,
- leaf_offset ,
- ISNULL(syscolumns.length, cols.max_length) AS [length] ,
- cols.system_type_id ,
- cols.leaf_bit_position AS bitpos ,
- ISNULL(syscolumns.xprec, cols.precision) AS xprec ,
- ISNULL(syscolumns.xscale, cols.scale) AS xscale ,
- SUBSTRING([nullBitMap], cols.leaf_null_bit, 1) AS is_null ,
- ( SELECT TOP 1
- ISNULL(SUM(CASE WHEN C.leaf_offset > 1
- THEN max_length
- ELSE 0
- END), 0)
- FROM sys.system_internals_partition_columns C
- WHERE cols.partition_id = C.partition_id
- AND C.leaf_null_bit < cols.leaf_null_bit
- ) + 5 AS [Column value Size] ,
- syscolumns.length AS [Column Length] ,
- CASE WHEN SUBSTRING([nullBitMap], cols.leaf_null_bit, 1) = 1
- THEN NULL
- ELSE SUBSTRING(Rowlogcontents,
- ( SELECT TOP 1
- ISNULL(SUM(CASE
- WHEN C.leaf_offset > 1
- AND C.leaf_bit_position = 0
- THEN max_length
- ELSE 0
- END), 0)
- FROM sys.system_internals_partition_columns C
- WHERE cols.partition_id = C.partition_id
- AND C.leaf_null_bit < cols.leaf_null_bit
- ) + 5, syscolumns.length)
- END AS hex_Value ,
- [Slot ID] ,
- 0
- FROM @DeletedRecords A
- INNER JOIN sys.allocation_units allocunits ON A.[AllocUnitId] = allocunits.[Allocation_Unit_Id]
- INNER JOIN sys.partitions partitions ON ( allocunits.type IN (
- 1, 3 )
- AND partitions.hobt_id = allocunits.container_id
- )
- OR ( allocunits.type = 2
- AND partitions.partition_id = allocunits.container_id
- )
- INNER JOIN sys.system_internals_partition_columns cols ON cols.partition_id = partitions.partition_id
- LEFT OUTER JOIN syscolumns ON syscolumns.id = partitions.object_id
- AND syscolumns.colid = cols.partition_column_id
- WHERE leaf_offset > 0
- ORDER BY nullbit
- DECLARE @BitColumnByte AS INT
- SELECT @BitColumnByte = CONVERT(INT, CEILING(COUNT(*) / 8.0))
- FROM @ColumnNameAndData
- WHERE [System_Type_id] = 104;
- WITH N1 ( n )
- AS ( SELECT 1
- UNION ALL
- SELECT 1
- ),
- N2 ( n )
- AS ( SELECT 1
- FROM N1 AS X ,
- N1 AS Y
- ),
- N3 ( n )
- AS ( SELECT 1
- FROM N2 AS X ,
- N2 AS Y
- ),
- N4 ( n )
- AS ( SELECT ROW_NUMBER() OVER ( ORDER BY X.n )
- FROM N3 AS X ,
- N3 AS Y
- ),
- CTE
- AS ( SELECT RowLogContents ,
- [nullbit] ,
- [BitMap] = CONVERT(VARBINARY(1), CONVERT(INT, SUBSTRING(( REPLACE(STUFF(( SELECT
- ','
- + ( CASE
- WHEN [ID] = 0
- THEN CONVERT(NVARCHAR(1), ( SUBSTRING(hex_Value,
- n, 1) % 2 ))
- ELSE CONVERT(NVARCHAR(1), ( ( SUBSTRING(hex_Value,
- n, 1)
- / [Bitvalue] )
- % 2 ))
- END ) --as [nullBitMap]
- FROM
- N4 AS Nums
- JOIN @ColumnNameAndData
- AS C ON n <= @BitColumnByte
- AND [System_Type_id] = 104
- AND bitpos = 0
- CROSS JOIN @bitTable
- WHERE
- C.[RowLogContents] = D.[RowLogContents]
- ORDER BY [RowLogContents] ,
- n ASC
- FOR
- XML
- PATH('')
- ), 1, 1, ''),
- ',', '') ),
- bitpos + 1, 1)))
- FROM @ColumnNameAndData D
- WHERE [System_Type_id] = 104
- )
- UPDATE A
- SET [hex_Value] = [BitMap]
- FROM @ColumnNameAndData A
- INNER JOIN CTE B ON A.[RowLogContents] = B.[RowLogContents]
- AND A.[nullbit] = B.[nullbit]
- /**************Check for BLOB DATA TYPES******************************/
- DECLARE @Fileid INT
- DECLARE @Pageid INT
- DECLARE @Slotid INT
- DECLARE @CurrentLSN INT
- DECLARE @LinkID INT
- DECLARE @Context VARCHAR(50)
- DECLARE @ConsolidatedPageID VARCHAR(MAX)
- DECLARE @LCX_TEXT_MIX VARBINARY(MAX)
- DECLARE @temppagedata TABLE
- (
- [ParentObject] SYSNAME ,
- [Object] SYSNAME ,
- [Field] SYSNAME ,
- [Value] SYSNAME
- )
- DECLARE @pagedata TABLE
- (
- [Page ID] SYSNAME ,
- [File IDS] INT ,
- [Page IDS] INT ,
- [AllocUnitId] BIGINT ,
- [ParentObject] SYSNAME ,
- [Object] SYSNAME ,
- [Field] SYSNAME ,
- [Value] SYSNAME
- )
- DECLARE @ModifiedRawData TABLE
- (
- [ID] INT IDENTITY(1, 1) ,
- [PAGE ID] VARCHAR(MAX) ,
- [FILE IDS] INT ,
- [PAGE IDS] INT ,
- [Slot ID] INT ,
- [AllocUnitId] BIGINT ,
- [RowLog Contents 0_var] VARCHAR(MAX) ,
- [RowLog Length] VARCHAR(50) ,
- [RowLog Len] INT ,
- [RowLog Contents 0] VARBINARY(MAX) ,
- [Link ID] INT DEFAULT ( 0 ) ,
- [Update] INT
- )
- DECLARE Page_Data_Cursor CURSOR
- FOR
- /*We need to filter LOP_MODIFY_ROW,LOP_MODIFY_COLUMNS from log for deleted records of BLOB data type& Get its Slot No, Page ID & AllocUnit ID*/
- SELECT LTRIM(RTRIM(REPLACE([Description], 'Deallocated', ''))) AS [PAGE ID] ,
- [Slot ID] ,
- [AllocUnitId] ,
- NULL AS [RowLog Contents 0] ,
- NULL AS [RowLog Contents 0] ,
- Context
- FROM sys.fn_dblog(NULL, NULL)
- WHERE AllocUnitId IN (
- SELECT [Allocation_unit_id]
- FROM sys.allocation_units allocunits
- INNER JOIN sys.partitions partitions ON ( allocunits.type IN (
- 1, 3 )
- AND partitions.hobt_id = allocunits.container_id
- )
- OR ( allocunits.type = 2
- AND partitions.partition_id = allocunits.container_id
- )
- WHERE object_id = OBJECT_ID('' + @SchemaName_n_TableName
- + '') )
- AND Operation IN ( 'LOP_MODIFY_ROW' )
- AND [Context] IN ( 'LCX_PFS' )
- AND Description LIKE '%Deallocated%'
- /*Use this subquery to filter the date*/
- AND [TRANSACTION ID] IN (
- SELECT DISTINCT
- [TRANSACTION ID]
- FROM sys.fn_dblog(NULL, NULL)
- WHERE Context IN ( 'LCX_NULL' )
- AND Operation IN ( 'LOP_BEGIN_XACT' )
- AND [Transaction Name] = 'DELETE'
- AND CONVERT(NVARCHAR(11), [Begin Time]) BETWEEN @Date_From
- AND
- @Date_To )
- GROUP BY [Description] ,
- [Slot ID] ,
- [AllocUnitId] ,
- Context
- UNION
- SELECT [PAGE ID] ,
- [Slot ID] ,
- [AllocUnitId] ,
- SUBSTRING([RowLog Contents 0], 15,
- LEN([RowLog Contents 0])) AS [RowLog Contents 0] ,
- CONVERT(INT, SUBSTRING([RowLog Contents 0], 7, 2)) ,
- Context --,CAST(RIGHT([Current LSN],4) AS INT) AS [Current LSN]
- FROM sys.fn_dblog(NULL, NULL)
- WHERE AllocUnitId IN (
- SELECT [Allocation_unit_id]
- FROM sys.allocation_units allocunits
- INNER JOIN sys.partitions partitions ON ( allocunits.type IN (
- 1, 3 )
- AND partitions.hobt_id = allocunits.container_id
- )
- OR ( allocunits.type = 2
- AND partitions.partition_id = allocunits.container_id
- )
- WHERE object_id = OBJECT_ID('' + @SchemaName_n_TableName
- + '') )
- AND Context IN ( 'LCX_TEXT_MIX' )
- AND Operation IN ( 'LOP_DELETE_ROWS' )
- /*Use this subquery to filter the date*/
- AND [TRANSACTION ID] IN (
- SELECT DISTINCT
- [TRANSACTION ID]
- FROM sys.fn_dblog(NULL, NULL)
- WHERE Context IN ( 'LCX_NULL' )
- AND Operation IN ( 'LOP_BEGIN_XACT' )
- AND [Transaction Name] = 'DELETE'
- AND CONVERT(NVARCHAR(11), [Begin Time]) BETWEEN @Date_From
- AND
- @Date_To )
- /****************************************/
- OPEN Page_Data_Cursor
- FETCH NEXT FROM Page_Data_Cursor INTO @ConsolidatedPageID, @Slotid,
- @AllocUnitID, @LCX_TEXT_MIX, @LinkID, @Context
- WHILE @@FETCH_STATUS = 0
- BEGIN
- DECLARE @hex_pageid AS VARCHAR(MAX)
- /*Page ID contains File Number and page number It looks like 0001:00000130.
- In this example 0001 is file Number & 00000130 is Page Number & These numbers are in Hex format*/
- SET @Fileid = SUBSTRING(@ConsolidatedPageID, 0,
- CHARINDEX(':', @ConsolidatedPageID)) -- Seperate File ID from Page ID
- SET @hex_pageid = '0x' + SUBSTRING(@ConsolidatedPageID,
- CHARINDEX(':',
- @ConsolidatedPageID)
- + 1, LEN(@ConsolidatedPageID)) ---Seperate the page ID
- SELECT @Pageid = CONVERT(INT, CAST('' AS XML).value('xs:hexBinary(substring(sql:variable("@hex_pageid"),sql:column("t.pos")) )',
- 'varbinary(max)')) -- Convert Page ID from hex to integer
- FROM ( SELECT CASE SUBSTRING(@hex_pageid, 1, 2)
- WHEN '0x' THEN 3
- ELSE 0
- END
- ) AS t ( pos )
- IF @Context = 'LCX_PFS'
- BEGIN
- DELETE @temppagedata
- INSERT INTO @temppagedata
- EXEC
- ( 'DBCC PAGE(' + @DataBase_Name + ', '
- + @fileid + ', ' + @pageid
- + ', 1) with tableresults,no_infomsgs;'
- );
- INSERT INTO @pagedata
- SELECT @ConsolidatedPageID ,
- @fileid ,
- @pageid ,
- @AllocUnitID ,
- [ParentObject] ,
- [Object] ,
- [Field] ,
- [Value]
- FROM @temppagedata
- END
- ELSE
- IF @Context = 'LCX_TEXT_MIX'
- BEGIN
- INSERT INTO @ModifiedRawData
- SELECT @ConsolidatedPageID ,
- @fileid ,
- @pageid ,
- @Slotid ,
- @AllocUnitID ,
- NULL ,
- 0 ,
- CONVERT(INT, CONVERT(VARBINARY, REVERSE(SUBSTRING(@LCX_TEXT_MIX,
- 11, 2)))) ,
- @LCX_TEXT_MIX ,
- @LinkID ,
- 0
- END
- FETCH NEXT FROM Page_Data_Cursor INTO @ConsolidatedPageID, @Slotid,
- @AllocUnitID, @LCX_TEXT_MIX, @LinkID, @Context
- END
- CLOSE Page_Data_Cursor
- DEALLOCATE Page_Data_Cursor
- DECLARE @Newhexstring VARCHAR(MAX);
- --The data is in multiple rows in the page, so we need to convert it into one row as a single hex value.
- --This hex value is in string format
- INSERT INTO @ModifiedRawData
- ( [PAGE ID] ,
- [FILE IDS] ,
- [PAGE IDS] ,
- [Slot ID] ,
- [AllocUnitId] ,
- [RowLog Contents 0_var] ,
- [RowLog Length]
- )
- SELECT [Page ID] ,
- [FILE IDS] ,
- [PAGE IDS] ,
- SUBSTRING([ParentObject],
- CHARINDEX('Slot', [ParentObject]) + 4,
- ( CHARINDEX('Offset', [ParentObject])
- - ( CHARINDEX('Slot', [ParentObject]) + 4 ) )
- - 2) AS [Slot ID] ,
- [AllocUnitId] ,
- SUBSTRING(( SELECT REPLACE(STUFF(( SELECT
- REPLACE(SUBSTRING([Value],
- CHARINDEX(':',
- [Value]) + 1,
- CHARINDEX('†',
- [Value])
- - CHARINDEX(':',
- [Value])), '†',
- '')
- FROM @pagedata C
- WHERE B.[Page ID] = C.[Page ID]
- AND SUBSTRING(B.[ParentObject],
- CHARINDEX('Slot',
- B.[ParentObject])
- + 4,
- ( CHARINDEX('Offset',
- B.[ParentObject])
- - ( CHARINDEX('Slot',
- B.[ParentObject])
- + 4 ) )) = SUBSTRING(C.[ParentObject],
- CHARINDEX('Slot',
- C.[ParentObject])
- + 4,
- ( CHARINDEX('Offset',
- C.[ParentObject])
- - ( CHARINDEX('Slot',
- C.[ParentObject])
- + 4 ) ))
- AND [Object] LIKE '%Memory Dump%'
- ORDER BY '0x'
- + LEFT([Value],
- CHARINDEX(':',
- [Value]) - 1)
- FOR
- XML PATH('')
- ), 1, 1, ''), ' ', '')
- ), 1, 20000) AS [Value] ,
- SUBSTRING(( SELECT '0x'
- + REPLACE(STUFF(( SELECT
- REPLACE(SUBSTRING([Value],
- CHARINDEX(':',
- [Value]) + 1,
- CHARINDEX('†',
- [Value])
- - CHARINDEX(':',
- [Value])), '†',
- '')
- FROM
- @pagedata C
- WHERE
- B.[Page ID] = C.[Page ID]
- AND SUBSTRING(B.[ParentObject],
- CHARINDEX('Slot',
- B.[ParentObject])
- + 4,
- ( CHARINDEX('Offset',
- B.[ParentObject])
- - ( CHARINDEX('Slot',
- B.[ParentObject])
- + 4 ) )) = SUBSTRING(C.[ParentObject],
- CHARINDEX('Slot',
- C.[ParentObject])
- + 4,
- ( CHARINDEX('Offset',
- C.[ParentObject])
- - ( CHARINDEX('Slot',
- C.[ParentObject])
- + 4 ) ))
- AND [Object] LIKE '%Memory Dump%'
- ORDER BY '0x'
- + LEFT([Value],
- CHARINDEX(':',
- [Value]) - 1)
- FOR
- XML PATH('')
- ), 1, 1, ''), ' ', '')
- ), 7, 4) AS [Length]
- FROM @pagedata B
- WHERE [Object] LIKE '%Memory Dump%'
- GROUP BY [Page ID] ,
- [FILE IDS] ,
- [PAGE IDS] ,
- [ParentObject] ,
- [AllocUnitId]--,[Current LSN]
- ORDER BY [Slot ID]
- UPDATE @ModifiedRawData
- SET [RowLog Len] = CONVERT(VARBINARY(8000), REVERSE(CAST('' AS XML).value('xs:hexBinary(substring(sql:column("[RowLog Length]"),0))',
- 'varbinary(Max)')))
- FROM @ModifiedRawData
- WHERE [LINK ID] = 0
- UPDATE @ModifiedRawData
- SET [RowLog Contents 0] = CAST('' AS XML).value('xs:hexBinary(substring(sql:column("[RowLog Contents 0_var]"),0))',
- 'varbinary(Max)')
- FROM @ModifiedRawData
- WHERE [LINK ID] = 0
- UPDATE B
- SET B.[RowLog Contents 0] = ( CASE WHEN A.[RowLog Contents 0] IS NOT NULL
- AND C.[RowLog Contents 0] IS NOT NULL
- THEN A.[RowLog Contents 0]
- + C.[RowLog Contents 0]
- WHEN A.[RowLog Contents 0] IS NULL
- AND C.[RowLog Contents 0] IS NOT NULL
- THEN C.[RowLog Contents 0]
- WHEN A.[RowLog Contents 0] IS NOT NULL
- AND C.[RowLog Contents 0] IS NULL
- THEN A.[RowLog Contents 0]
- END ) ,
- B.[Update] = ISNULL(B.[Update], 0) + 1
- FROM @ModifiedRawData B
- LEFT JOIN @ModifiedRawData A ON A.[Page IDS] = CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING(B.[RowLog Contents 0],
- 15 + 14, 2))))
- AND A.[File IDS] = CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING(B.[RowLog Contents 0],
- 19 + 14, 2))))
- AND A.[Link ID] = B.[Link ID]
- LEFT JOIN @ModifiedRawData C ON C.[Page IDS] = CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING(B.[RowLog Contents 0],
- 27 + 14, 2))))
- AND C.[File IDS] = CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING(B.[RowLog Contents 0],
- 31 + 14, 2))))
- AND C.[Link ID] = B.[Link ID]
- WHERE ( A.[RowLog Contents 0] IS NOT NULL
- OR C.[RowLog Contents 0] IS NOT NULL
- )
- UPDATE B
- SET B.[RowLog Contents 0] = ( CASE WHEN A.[RowLog Contents 0] IS NOT NULL
- AND C.[RowLog Contents 0] IS NOT NULL
- THEN A.[RowLog Contents 0]
- + C.[RowLog Contents 0]
- WHEN A.[RowLog Contents 0] IS NULL
- AND C.[RowLog Contents 0] IS NOT NULL
- THEN C.[RowLog Contents 0]
- WHEN A.[RowLog Contents 0] IS NOT NULL
- AND C.[RowLog Contents 0] IS NULL
- THEN A.[RowLog Contents 0]
- END )
- --,B.[Update]=ISNULL(B.[Update],0)+1
- FROM @ModifiedRawData B
- LEFT JOIN @ModifiedRawData A ON A.[Page IDS] = CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING(B.[RowLog Contents 0],
- 15 + 14, 2))))
- AND A.[File IDS] = CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING(B.[RowLog Contents 0],
- 19 + 14, 2))))
- AND A.[Link ID] <> B.[Link ID]
- AND B.[Update] = 0
- LEFT JOIN @ModifiedRawData C ON C.[Page IDS] = CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING(B.[RowLog Contents 0],
- 27 + 14, 2))))
- AND C.[File IDS] = CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING(B.[RowLog Contents 0],
- 31 + 14, 2))))
- AND C.[Link ID] <> B.[Link ID]
- AND B.[Update] = 0
- WHERE ( A.[RowLog Contents 0] IS NOT NULL
- OR C.[RowLog Contents 0] IS NOT NULL
- )
- UPDATE @ModifiedRawData
- SET [RowLog Contents 0] = ( CASE WHEN [RowLog Len] >= 8000
- THEN SUBSTRING([RowLog Contents 0],
- 15, [RowLog Len])
- WHEN [RowLog Len] < 8000
- THEN SUBSTRING([RowLog Contents 0],
- 15 + 6,
- CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING([RowLog Contents 0],
- 15, 6)))))
- END )
- FROM @ModifiedRawData
- WHERE [LINK ID] = 0
- UPDATE @ColumnNameAndData
- SET [hex_Value] = [RowLog Contents 0]
- --,A.[Update]=A.[Update]+1
- FROM @ColumnNameAndData A
- INNER JOIN @ModifiedRawData B ON CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING([hex_value],
- 17, 4)))) = [PAGE IDS]
- AND CONVERT(INT, SUBSTRING([hex_value],
- 9, 2)) = B.[Link ID]
- WHERE [System_Type_Id] IN ( 99, 167, 175, 231, 239, 241, 165, 98 )
- AND [Link ID] <> 0
- UPDATE @ColumnNameAndData
- SET [hex_Value] = ( CASE WHEN B.[RowLog Contents 0] IS NOT NULL
- AND C.[RowLog Contents 0] IS NOT NULL
- THEN B.[RowLog Contents 0]
- + C.[RowLog Contents 0]
- WHEN B.[RowLog Contents 0] IS NULL
- AND C.[RowLog Contents 0] IS NOT NULL
- THEN C.[RowLog Contents 0]
- WHEN B.[RowLog Contents 0] IS NOT NULL
- AND C.[RowLog Contents 0] IS NULL
- THEN B.[RowLog Contents 0]
- END )
- --,A.[Update]=A.[Update]+1
- FROM @ColumnNameAndData A
- LEFT JOIN @ModifiedRawData B ON CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING([hex_value],
- 5, 4)))) = B.[PAGE IDS]
- AND B.[Link ID] = 0
- LEFT JOIN @ModifiedRawData C ON CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING([hex_value],
- 17, 4)))) = C.[PAGE IDS]
- AND C.[Link ID] = 0
- WHERE [System_Type_Id] IN ( 99, 167, 175, 231, 239, 241, 165, 98 )
- AND ( B.[RowLog Contents 0] IS NOT NULL
- OR C.[RowLog Contents 0] IS NOT NULL
- )
- UPDATE @ColumnNameAndData
- SET [hex_Value] = [RowLog Contents 0]
- --,A.[Update]=A.[Update]+1
- FROM @ColumnNameAndData A
- INNER JOIN @ModifiedRawData B ON CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING([hex_value],
- 9, 4)))) = [PAGE IDS]
- AND CONVERT(INT, SUBSTRING([hex_value],
- 3, 2)) = [Link ID]
- WHERE [System_Type_Id] IN ( 35, 34, 99 )
- AND [Link ID] <> 0
- UPDATE @ColumnNameAndData
- SET [hex_Value] = [RowLog Contents 0]
- --,A.[Update]=A.[Update]+10
- FROM @ColumnNameAndData A
- INNER JOIN @ModifiedRawData B ON CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING([hex_value],
- 9, 4)))) = [PAGE IDS]
- WHERE [System_Type_Id] IN ( 35, 34, 99 )
- AND [Link ID] = 0
- UPDATE @ColumnNameAndData
- SET [hex_Value] = [RowLog Contents 0]
- --,A.[Update]=A.[Update]+1
- FROM @ColumnNameAndData A
- INNER JOIN @ModifiedRawData B ON CONVERT(INT, CONVERT(VARBINARY(MAX), REVERSE(SUBSTRING([hex_value],
- 15, 4)))) = [PAGE IDS]
- WHERE [System_Type_Id] IN ( 35, 34, 99 )
- AND [Link ID] = 0
- UPDATE @ColumnNameAndData
- SET [hex_value] = 0xFFFE + SUBSTRING([hex_value], 9, LEN([hex_value]))
- --,[Update]=[Update]+1
- WHERE [system_type_id] = 241
- CREATE TABLE [#temp_Data]
- (
- [FieldName] VARCHAR(MAX) ,
- [FieldValue] NVARCHAR(MAX) ,
- [Rowlogcontents] VARBINARY(8000) ,
- [Row ID] INT
- )
- INSERT INTO #temp_Data
- SELECT NAME ,
- CASE WHEN system_type_id IN ( 231, 239 )
- THEN LTRIM(RTRIM(CONVERT(NVARCHAR(MAX), hex_Value))) --NVARCHAR ,NCHAR
- WHEN system_type_id IN ( 167, 175 )
- THEN LTRIM(RTRIM(CONVERT(VARCHAR(MAX), hex_Value))) --VARCHAR,CHAR
- WHEN system_type_id IN ( 35 )
- THEN LTRIM(RTRIM(CONVERT(VARCHAR(MAX), hex_Value))) --Text
- WHEN system_type_id IN ( 99 )
- THEN LTRIM(RTRIM(CONVERT(NVARCHAR(MAX), hex_Value))) --nText
- WHEN system_type_id = 48
- THEN CONVERT(VARCHAR(MAX), CONVERT(TINYINT, CONVERT(BINARY(1), REVERSE(hex_Value)))) --TINY INTEGER
- WHEN system_type_id = 52
- THEN CONVERT(VARCHAR(MAX), CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(hex_Value)))) --SMALL INTEGER
- WHEN system_type_id = 56
- THEN CONVERT(VARCHAR(MAX), CONVERT(INT, CONVERT(BINARY(4), REVERSE(hex_Value)))) -- INTEGER
- WHEN system_type_id = 127
- THEN CONVERT(VARCHAR(MAX), CONVERT(BIGINT, CONVERT(BINARY(8), REVERSE(hex_Value))))-- BIG INTEGER
- WHEN system_type_id = 61
- THEN CONVERT(VARCHAR(MAX), CONVERT(DATETIME, CONVERT(VARBINARY(8000), REVERSE(hex_Value))), 100) --DATETIME
- WHEN system_type_id = 58
- THEN CONVERT(VARCHAR(MAX), CONVERT(SMALLDATETIME, CONVERT(VARBINARY(8000), REVERSE(hex_Value))), 100) --SMALL DATETIME
- WHEN system_type_id = 108
- THEN CONVERT(VARCHAR(MAX), CONVERT(NUMERIC(38, 20), CONVERT(VARBINARY, CONVERT(VARBINARY(1), xprec)
- + CONVERT(VARBINARY(1), xscale))
- + CONVERT(VARBINARY(1), 0) + hex_Value)) --- NUMERIC
- WHEN system_type_id = 106
- THEN CONVERT(VARCHAR(MAX), CONVERT(DECIMAL(38, 20), CONVERT(VARBINARY, CONVERT(VARBINARY(1), xprec)
- + CONVERT(VARBINARY(1), xscale))
- + CONVERT(VARBINARY(1), 0) + hex_Value)) --- DECIMAL
- WHEN system_type_id IN ( 60, 122 )
- THEN CONVERT(VARCHAR(MAX), CONVERT(MONEY, CONVERT(VARBINARY(8000), REVERSE(hex_Value))), 2) --MONEY,SMALLMONEY
- WHEN system_type_id = 104
- THEN CONVERT(VARCHAR(MAX), CONVERT (BIT, CONVERT(BINARY(1), hex_Value)
- % 2)) -- BIT
- WHEN system_type_id = 62
- THEN RTRIM(LTRIM(STR(CONVERT(FLOAT, SIGN(CAST(CONVERT(VARBINARY(8000), REVERSE(hex_Value)) AS BIGINT))
- * ( 1.0
- + ( CAST(CONVERT(VARBINARY(8000), REVERSE(hex_Value)) AS BIGINT)
- & 0x000FFFFFFFFFFFFF )
- * POWER(CAST(2 AS FLOAT),
- -52) )
- * POWER(CAST(2 AS FLOAT),
- ( ( CAST(CONVERT(VARBINARY(8000), REVERSE(hex_Value)) AS BIGINT)
- & 0x7ff0000000000000 )
- / EXP(52 * LOG(2))
- - 1023 ))), 53,
- LEN(hex_Value)))) --- FLOAT
- WHEN system_type_id = 59
- THEN LEFT(LTRIM(STR(CAST(SIGN(CAST(CONVERT(VARBINARY(8000), REVERSE(hex_Value)) AS BIGINT))
- * ( 1.0
- + ( CAST(CONVERT(VARBINARY(8000), REVERSE(hex_Value)) AS BIGINT)
- & 0x007FFFFF )
- * POWER(CAST(2 AS REAL), -23) )
- * POWER(CAST(2 AS REAL),
- ( ( ( CAST(CONVERT(VARBINARY(8000), REVERSE(hex_Value)) AS INT) )
- & 0x7f800000 )
- / EXP(23 * LOG(2))
- - 127 )) AS REAL), 23,
- 23)), 8) --Real
- WHEN system_type_id IN ( 165, 173 )
- THEN ( CASE WHEN CHARINDEX(0x,
- CAST('' AS XML).value('xs:hexBinary(sql:column("hex_Value"))',
- 'VARBINARY(8000)')) = 0
- THEN '0x'
- ELSE ''
- END ) + CAST('' AS XML).value('xs:hexBinary(sql:column("hex_Value"))',
- 'varchar(max)') -- BINARY,VARBINARY
- WHEN system_type_id = 34
- THEN ( CASE WHEN CHARINDEX(0x,
- CAST('' AS XML).value('xs:hexBinary(sql:column("hex_Value"))',
- 'VARBINARY(8000)')) = 0
- THEN '0x'
- ELSE ''
- END ) + CAST('' AS XML).value('xs:hexBinary(sql:column("hex_Value"))',
- 'varchar(max)') --IMAGE
- WHEN system_type_id = 36
- THEN CONVERT(VARCHAR(MAX), CONVERT(UNIQUEIDENTIFIER, hex_Value)) --UNIQUEIDENTIFIER
- WHEN system_type_id = 231
- THEN CONVERT(VARCHAR(MAX), CONVERT(SYSNAME, hex_Value)) --SYSNAME
- WHEN system_type_id = 241
- THEN CONVERT(VARCHAR(MAX), CONVERT(XML, hex_Value)) --XML
- WHEN system_type_id = 189
- THEN ( CASE WHEN CHARINDEX(0x,
- CAST('' AS XML).value('xs:hexBinary(sql:column("hex_Value"))',
- 'VARBINARY(8000)')) = 0
- THEN '0x'
- ELSE ''
- END ) + CAST('' AS XML).value('xs:hexBinary(sql:column("hex_Value"))',
- 'varchar(max)') --TIMESTAMP
- WHEN system_type_id = 98
- THEN ( CASE WHEN CONVERT(INT, SUBSTRING(hex_Value, 1,
- 1)) = 56
- THEN CONVERT(VARCHAR(MAX), CONVERT(INT, CONVERT(BINARY(4), REVERSE(SUBSTRING(hex_Value,
- 3,
- LEN(hex_Value)))))) -- INTEGER
- WHEN CONVERT(INT, SUBSTRING(hex_Value, 1,
- 1)) = 108
- THEN CONVERT(VARCHAR(MAX), CONVERT(NUMERIC(38,
- 20), CONVERT(VARBINARY(1), SUBSTRING(hex_Value,
- 3, 1))
- + CONVERT(VARBINARY(1), SUBSTRING(hex_Value,
- 4, 1))
- + CONVERT(VARBINARY(1), 0)
- + SUBSTRING(hex_Value, 5,
- LEN(hex_Value)))) --- NUMERIC
- WHEN CONVERT(INT, SUBSTRING(hex_Value, 1,
- 1)) = 167
- THEN LTRIM(RTRIM(CONVERT(VARCHAR(MAX), SUBSTRING(hex_Value,
- 9,
- LEN(hex_Value))))) --VARCHAR,CHAR
- WHEN CONVERT(INT, SUBSTRING(hex_Value, 1,
- 1)) = 36
- THEN CONVERT(VARCHAR(MAX), CONVERT(UNIQUEIDENTIFIER, SUBSTRING(( hex_Value ),
- 3, 20))) --UNIQUEIDENTIFIER
- WHEN CONVERT(INT, SUBSTRING(hex_Value, 1,
- 1)) = 61
- THEN CONVERT(VARCHAR(MAX), CONVERT(DATETIME, CONVERT(VARBINARY(8000), REVERSE(SUBSTRING(hex_Value,
- 3,
- LEN(hex_Value))))), 100) --DATETIME
- WHEN CONVERT(INT, SUBSTRING(hex_Value, 1,
- 1)) = 165
- THEN '0x'
- + SUBSTRING(( CASE WHEN CHARINDEX(0x,
- CAST('' AS XML).value('xs:hexBinary(sql:column("hex_Value"))',
- 'VARBINARY(8000)')) = 0
- THEN '0x'
- ELSE ''
- END )
- + CAST('' AS XML).value('xs:hexBinary(sql:column("hex_Value"))',
- 'varchar(max)'),
- 11, LEN(hex_Value)) -- BINARY,VARBINARY
- END )
- END AS FieldValue ,
- [Rowlogcontents] ,
- [Row ID]
- FROM @ColumnNameAndData
- ORDER BY nullbit
- --Create the column name in the same order to do pivot table.
- DECLARE @FieldName VARCHAR(MAX)
- SET @FieldName = STUFF(( SELECT ','
- + CAST(QUOTENAME([Name]) AS VARCHAR(MAX))
- FROM syscolumns
- WHERE id = OBJECT_ID(''
- + @SchemaName_n_TableName
- + '')
- FOR
- XML PATH('')
- ), 1, 1, '')
- --Finally did pivot table and get the data back in the same format.
- SET @sql = 'SELECT ' + @FieldName
- + ' FROM #temp_Data PIVOT (Min([FieldValue]) FOR FieldName IN ('
- + @FieldName + ')) AS pvt'
- EXEC sp_executesql @sql
- GO
恢复你的数据
--恢复数据，不加时间段条件 参数：数据库名，表名
--EXAMPLE #1 : FOR ALL DELETED RECORDS
EXEC Recover_Deleted_Data_Proc 'test','dbo.aa'
GO --恢复数据，加时间段条件
--EXAMPLE #2 : FOR ANY SPECIFIC DATE RANGE
EXEC Recover_Deleted_Data_Proc 'test','dbo.aa','2014-04-23','2014-04-23'
执行了下面的存储过程之后你会发现会显示出刚才删除的数据
EXEC Recover_Deleted_Data_Proc 'test','dbo.aa'
GO
解释
究竟他是如何工作的?让我们来一步一步来,这个过程涉及到7个步骤:
步骤1:
我们需要获得SQLSERVER删除的数据记录.使用标准SQLSERVER函数fn_dblog，我们能够容易的获得事务日志记录（包括
已删的数据。不过，我们只需要事务日志中选中的被删数据，所以我们的过滤条件需要包含3个字段 Context, Operation & AllocUnitName）
We need to get the deleted records from sql server. By using the standard SQL Server function fn_blog, we can easily get all transaction log (Including deleted data. But, we need only the selected deleted records from the transaction log. So we included three filters (Context, Operation , AllocUnitName).
- Context (‘LCX_MARK_AS_GHOST’and ‘LCX_HEAP’)
- Operation (‘LOP_DELETE_ROWS’)
- AllocUnitName(‘dbo.aa’) –- Schema + table Name
Context可以说明是堆表还是聚集表
Operation：删除操作
AllocUnitName：分配单元名称，表名
下面是一个代码片段
SELECT [RowLog Contents 0]
FROM sys.fn_dblog(NULL, NULL)
WHERE AllocUnitName = 'dbo.aa'
AND Context IN ( 'LCX_MARK_AS_GHOST', 'LCX_HEAP' )
AND Operation IN ( 'LOP_DELETE_ROWS' )
这个查询会返回不同列的信息，但是我们只需要选择[RowLog Contents 0]列，去获得被删除的数据的内容
RowLog content 0列的内容类似于这样
“0x300018000100000000000000006B0000564920205900000
00500E001002800426F62206A65727279″
步骤2:
现在，我们已经删除了数据，这些数据以hex码的形式放在事务日志里，这些hex码是有规律的，我们根据这些规律可以很容易恢复这些数据。
不过在恢复这些数据之前，我们需要理解这些格式。这些格式在KalenDelaney’s SQL Internal’s book.的书里面有讲解
- 1 Byte : Status Bit A
- 1 Byte : Status Bit B
- 2 Bytes : Fixed length size
- n Bytes : Fixed length data
- 2 Bytes : Total Number of Columns
- n Bytes : NULL Bitmap (1 bit for each column as 1 indicates that the column is null and 0 indicate that the column is not null)
- 2 Bytes : Number of variable-length columns
- n Bytes : Column offset array (2x variable length column)
- n Bytes : Data for variable length columns
所以, hex码的“RowLog content 0″列的内容就等价于
“Status Bit A +Status Bit B +Fixed length size +Fixed length data +Total Number of Columns +NULL Bitmap +Number of variable-length columns +NULL Bitmap+Number of variable-length columns +Column offset array +Data for variable length columns.”
更详细的可以参考：SQL Server2008存储结构之堆表、行溢出
关于数据行的结构我们还可以采用稍微宏观一些的视角来查看。
步骤3:
现在，我们需要解剖RowLog Content o列的内容（我们删除的数据的Hex码），利用上面的数据行的结构
- [Fixed Length Data] = Substring (RowLog content 0, Status Bit A+Status Bit B + 1,2 bytes)
- [Total No of Columns]= Substring (RowLog content 0, [Fixed Length Data] + 1,2 bytes)
- [Null Bitmap length] = Ceiling ([Total No of Columns]/8.0)
- [Null Bytes]= Substring (RowLog content 0, Status Bit A+ Status Bit B +[Fixed Length Data] +1, [Null Bitmap length] )
- Total no of variable columns = Substring (RowLog content 0, Status Bit A+ Status Bit B + [Fixed Length Data] +1, [Null Bitmap length] + 2 )
- Column Offset Array= Substring (RowLog content 0, Status Bit A+ Status Bit B + [Fixed Length Data] +1, [Null Bitmap length] + 2 , Total no of variable columns*2 )
- Variable Column Start = Status Bit A+ Status Bit B + [Fixed Length Data] + [Null Bitmap length] + 2+( Total no of variable columns*2)
步骤4:
现在我们已经将hex码切开了(0x300008000100000002000001001300604F7D59),所以,我们能找到删除的行的某列的数据是否为null值
根据NULL位图。为了完成将NULL Bytes的hex码转换为二进制格式（正如之前讨论的，1表示行中对应的那一列为null，而0则表示对应的列有实际的数据）
如果还不是明白的童鞋可以看一下我写的这篇文章：《SQLSERVER中NULL位图的作用》
步骤5:
现在，我们已经做了初步的数据分割 (Step-3) 和null值判断(Step-4) 。然后我们需要使用代码片段去获得列数据，例如：列名，列大小，精度，范围
和最重要的叶子的null位（确保列数据是固定长度的（<=-1表示可变长度）或者固定长度的（>=1））
使用下面的SQL语句
SELECT *
FROM sys.allocation_units allocunits
INNER JOIN sys.partitions partitions ON ( allocunits.type IN ( 1, 3 )
AND partitions.hobt_id = allocunits.container_id
)
OR ( allocunits.type = 2
AND partitions.partition_id = allocunits.container_id
)
INNER JOIN sys.system_internals_partition_columns cols ON cols.partition_id = partitions.partition_id
LEFT OUTER JOIN syscolumns ON syscolumns.id = partitions.object_id
AND syscolumns.colid = cols.partition_column_id
与(Step-1,2,3,4) 获得的数据表做join连接，根据allocunits.[Allocation_Unit_Id]。
现在我们知道表和表中的数据信息，那么我们需要利用这些数据去将 [RowLog Contents 0] 列里的hex码的数据插入到表中的相应列
现在我们需要关心每一列的数据究竟是固定长度的还是可变长度的
步骤6:
我们收集了每列的hex格式的数据。现在我们需要利用[System_type_id]去转换这些数据回去正确的数据类型
每一种数据类型都有不同的数据类型转换机制。
--NVARCHAR ,NCHAR
WHEN system_type_id IN (231, 239) THEN LTRIM(RTRIM(CONVERT(NVARCHAR(max),hex_Value))) --VARCHAR,CHAR
WHEN system_type_id IN (167,175) THEN LTRIM(RTRIM(CONVERT(VARCHAR(max),REPLACE(hex_Value, 0x00, 0x20)))) --TINY INTEGER
WHEN system_type_id = 48 THEN CONVERT(VARCHAR(MAX), CONVERT(TINYINT, CONVERT(BINARY(1), REVERSE (hex_Value)))) --SMALL INTEGER
WHEN system_type_id = 52 THEN CONVERT(VARCHAR(MAX), CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE (hex_Value)))) -- INTEGER
WHEN system_type_id = 56 THEN CONVERT(VARCHAR(MAX), CONVERT(INT, CONVERT(BINARY(4), REVERSE(hex_Value)))) -- BIG INTEGER
WHEN system_type_id = 127 THEN CONVERT(VARCHAR(MAX), CONVERT(BIGINT, CONVERT(BINARY(8), REVERSE(hex_Value)))) --DATETIME
WHEN system_type_id = 61 Then CONVERT(VARCHAR(Max),CONVERT(DATETIME,Convert(VARBINARY(max),REVERSE (hex_Value))),100) --SMALL DATETIME
WHEN system_type_id =58 Then CONVERT(VARCHAR(Max),CONVERT(SMALLDATETIME,CONVERT(VARBINARY(MAX),REVERSE(hex_Value))),100) --SMALL DATETIME --- NUMERIC
WHEN system_type_id = 108 THEN CONVERT(VARCHAR(MAX), CAST(CONVERT(NUMERIC(18,14), CONVERT(VARBINARY,CONVERT(VARBINARY,xprec)+CONVERT(VARBINARY,xscale))+CONVERT(VARBINARY(1),0) + hex_Value) as FLOAT)) --MONEY,SMALLMONEY
WHEN system_type_id In(60,122) THEN CONVERT(VARCHAR(MAX),Convert(MONEY,Convert(VARBINARY(MAX),Reverse(hex_Value))),2) --- DECIMAL
WHEN system_type_id = 106 THEN CONVERT(VARCHAR(MAX), CAST(CONVERT(Decimal(38,34), Convert(VARBINARY,Convert(VARBINARY,xprec)+CONVERT(VARBINARY,xscale))+CONVERT(VARBINARY(1),0) + hex_Value) as FLOAT)) -- BIT
WHEN system_type_id = 104 THEN CONVERT(VARCHAR(MAX),CONVERT (BIT,CONVERT(BINARY(1), hex_Value)%2)) --- FLOAT
WHEN system_type_id = 62 THEN RTRIM(LTRIM(Str(Convert(FLOAT,SIGN(CAST(Convert(VARBINARY(max),Reverse(hex_Value)) AS BIGINT)) * (1.0 + (CAST(CONVERT(VARBINARY(max),Reverse(hex_Value)) AS BIGINT) & 0x000FFFFFFFFFFFFF) * POWER(CAST(2 AS FLOAT), -52)) * POWER(CAST(2 AS FLOAT),((CAST(CONVERT(VARBINARY(max),Reverse(hex_Value)) AS BIGINT) & 0x7ff0000000000000) / EXP(52 * LOG(2))-1023))),53,LEN(hex_Value)))) --REAL
When system_type_id =59 THEN Left(LTRIM(STR(Cast(SIGN(CAST(Convert(VARBINARY(max),Reverse(hex_Value)) AS BIGINT))* (1.0 + (CAST(CONVERT(VARBINARY(max),Reverse(hex_Value)) AS BIGINT) & 0x007FFFFF) * POWER(CAST(2 AS Real), -23)) * POWER(CAST(2 AS Real),(((CAST(CONVERT(VARBINARY(max),Reverse(hex_Value)) AS INT) )& 0x7f800000)/ EXP(23 * LOG(2))-127))AS REAL),23,23)),8) --BINARY,VARBINARY
WHEN system_type_id In (165,173) THEN (CASE WHEN Charindex(0x,cast('' AS XML).value('xs:hexBinary(sql:column("hex_value"))', 'varbinary(max)')) = 0 THEN '0x' ELSE '' END) +cast('' AS XML).value('xs:hexBinary(sql:column("hex_value"))', 'varchar(max)') --UNIQUEIDENTIFIER
WHEN system_type_id =36 THEN CONVERT(VARCHAR(MAX),CONVERT(UNIQUEIDENTIFIER,hex_Value))
步骤7:
最终我们做一个数据透视表，你会看到最后的结果：被删的数据回来了！
注意：这些数据只是展示出来并没有自动插入回表中，你需要将这些数据重新插入回去表中！
我的测试
经过测试，作者写的这个存储过程还是有些问题
如果你创建的测试表的数据类型有xml或者是一些text数据类型的字段会有报错
Msg 537, Level 16, State 3, Procedure Recover_Deleted_Data_Proc, Line 525
Invalid length parameter passed to the LEFT or SUBSTRING function. Msg 9420, Level 16, State 1, Procedure Recover_Deleted_Data_Proc, Line 651
XML parsing: line 1, character 2, illegal xml character
但是一般的数据类型则不会，例如nvarchar这些
还有不要在存储过程的最后加
--Recover the deleted data without date range
EXEC Recover_Deleted_Data_Proc 'test','dbo.Test_Table'
GO
--Recover the deleted data it with date range
EXEC Recover_Deleted_Data_Proc 'test','dbo.Test_Table','2012-06-01','2012-06-30'
否则会报错
消息 50000，级别 16，状态 1，过程 Recover_Deleted_Data_Proc，第 290 行
There is no data in the log as per the search criteria
总结
实际上这个存储过程还是挺有研究意义的，对于想做一个跟Log Explorer for SQL Server软件功能差不多的软件出来
还是有可能的，跟着作者的思路，一步一步实现
苦于最近太忙，先分享出来，以后再研究这个存储过程了~
如有不对的地方，欢迎大家拍砖o(∩_∩)o
支持date类型 感谢园友 dwchaoyue
EXEC Recover_Deleted_Data_Proc 'sss','dbo.testdaterecover','2014-04-23','2014-10-23'
--DROP TABLE testdaterecover
CREATE TABLE testdaterecover(dd DATE,cc DATETIME)
GO
INSERT INTO [dbo].[testdaterecover]
( [dd], [cc] )
VALUES ( GETDATE(), -- dd - date
GETDATE() -- cc - datetime
) SELECT CONVERT(VARCHAR(MAX),CONVERT(DATETIME, CONVERT(VARBINARY(8000),[cc])),120) FROM [dbo].[testdaterecover] DELETE [dbo].[testdaterecover] THEN CONVERT(VARCHAR(MAX), CONVERT(DATETIME, CONVERT(VARBINARY(8000), REVERSE(hex_Value))), 121) --DATETIME
2015-12-17 补充
注意：脚本中大量使用了reverse函数来进行转换，因为reverse函数的定义是返回字符串值的逆序，不是字节的逆序
那么就会导致有些数据类型是按字节逆序的，就会出错
WHEN system_type_id = 52 THEN CONVERT(VARCHAR(MAX), CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE (hex_Value))))
在SQL Server中，sys.fn_PhysLocFormatter这个函数也是使用reverse函数进行RID逆序，当遇到81-FE之间的字节时 被认为是双字节字符组合在一起参与逆序运算
所以得出来的某些结果也是错的，详细请参考《SQL Server性能调优实战》 P115
函数的逻辑是，每个字节加上相应的位数
比如 2这个数字是在第二个字节位置的，那么公式就是2*POWER(2,8) =512
相应进制
二进制后面加8个0
十六进制后面加2个0
只要学过计算机基础都不难理解的
本文版权归作者所有，未经作者同意不得转载。
恢复SQL Server被误删除的数据的更多相关文章
- 恢复SQL Server被误删除的数据（再扩展）
恢复SQL Server被误删除的数据(再扩展) 大家对本人之前的文章<恢复SQL Server被误删除的数据> 反应非常热烈,但是文章里的存储过程不能实现对备份出来的日志备份里所删数据的 ...
- SQL Server中误删除数据的恢复
SQL Server中误删除数据的恢复本来不是件难事,从事务日志恢复即可.但是,这个恢复需要有两个前提条件: 1. 至少有一个误删除之前的数据库完全备份. 2. 数据库的恢复模式(Recovery m ...
- ApexSQL Log 从意外UPDATE和DELETE操作中恢复SQL Server数据
下载地址:https://www.apexsql.com/download.aspx 如何从意外UPDATE和DELETE操作中恢复SQL Server数据 ApexSQL Log 从意外UPDATE ...
- 通过日志恢复SQL Server的历史数据
通过日志恢复SQL Server的历史数据 Posted on 2008-11-14 21:47 代码乱了 阅读(4658) 评论(10) 编辑 收藏 园子里前段时间发过一篇通过日志恢复MSSQL数 ...
- 如何恢复SQL Server 中的Master库
如何恢复SQL Server 2005中的Master库 2011-05-10 16:34 Vegas Lee 博客园 我要评论(0) 字号:T | T master库对于SQLServer来说, ...
- MS SQL Server数据库修复/MDF数据文件数据恢复/MDF质疑/mdf无法附加
微软的SQL Server 数据库最常用的有两种类型的文件: 1.主要数据文件,文件后缀一般是.MDF: 2.事务日志文件,文件后缀一般是.LDF. 用户数据表.视图.存储过程等等数据,都是存放在MD ...
- SQL SERVER 和ACCESS的数据导入导出
//批量导入Access string filepath = Server.MapPath("student.mdb"); stri ...
- .SQL Server中 image类型数据的比较
原文:.SQL Server中 image类型数据的比较 在SQL Server中如果你对text.ntext或者image数据类型的数据进行比较.将会提示:不能比较或排序 text.ntext 和 ...
- SQL Server 2008 批量插入数据时报错
前几天在SQL Server 2008同步产品数据时,总是提示二进制文本被截断的错误,但是经过检查发现数据都符合格式要求. 百思不得其解,单独插入一条条数据则可以插入,但是批量导入则报错. 批量导入代 ...
随机推荐
- .NET Core中的认证管理解析
.NET Core中的认证管理解析 0x00 问题来源 在新建.NET Core的Web项目时选择“使用个人用户账户”就可以创建一个带有用户和权限管理的项目,已经准备好了用户注册.登录等很多页面,也可 ...
- Git 在团队中的最佳实践--如何正确使用Git Flow
我们已经从SVN 切换到Git很多年了,现在几乎所有的项目都在使用Github管理, 本篇文章讲一下为什么使用Git, 以及如何在团队中正确使用. Git的优点 Git的优点很多,但是这里只列出我认为 ...
- 【翻译】MongoDB指南/CRUD操作（二）
[原文地址]https://docs.mongodb.com/manual/ MongoDB CRUD操作(二) 主要内容: 更新文档,删除文档,批量写操作,SQL与MongoDB映射图,读隔离(读关 ...
- mysql 7下载安装及问题解决
mysql 7安装及问题解决 一.mysql下载 下载地址:https://www.mysql.com/downloads/ Community (GPL) Downloads MySQL Commu ...
- 展望未来：使用 PostCSS 和 cssnext 书写 CSS
原文链接:A look into writing future CSS with PostCSS and cssnext 译者:nzbin 像twitter,google,bbc使用的一样,我打算看一 ...
- 算法与数据结构(十四) 堆排序 (Swift 3.0版)
上篇博客主要讲了冒泡排序.插入排序.希尔排序以及选择排序.本篇博客就来讲一下堆排序(Heap Sort).看到堆排序这个名字我们就应该知道这种排序方式的特点,就是利用堆来讲我们的序列进行排序.&quo ...
- Javascript实现HashTable类
散列算法可以尽快在数据结构中找出指定的一个值,因为可以通过Hash算法求出值的所在位置,存储和插入的时候都按照Hash算法放到指定位置. <script> function HashTab ...
- [原][Docker]特性与原理解析
Docker特性与原理解析 文章假设你已经熟悉了Docker的基本命令和基本知识 首先看看Docker提供了哪些特性: 交互式Shell:Docker可以分配一个虚拟终端并关联到任何容器的标准输入上, ...
- 【云知道】究极秒杀Loadrunner乱码
Loadrunner乱码一击必杀 之前有介绍一些简单的针对Loadrunner脚本或者调试输出内容中乱码的一些设置,但是并没能完全解决一些小伙伴的问题,因为那些设置实在能力有限,还是有很多做不到的事情 ...
- 使用po模式读取豆瓣读书最受关注的书籍，取出标题、评分、评论、题材 按评分从小到大排序并输出到txt文件中
#coding=utf-8from time import sleepimport unittestfrom selenium import webdriverfrom selenium.webdri ...