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Archive for August, 2013

Formatting phone number has never been an issue, the only thing that you need to do is, use few string functions and you can convert it into any format. But what encourages me to write this article is that we can format the phone numbers in any format using only one function, i.e. Format (introduced in SQL Server 2012).

Note : I usually recommend that phone number must be properly maintained inside the database. But sometimes we come across this issue in legacy systems.

Sample :
Let me create a sample to explain it.

USE tempdb
GO
--DROP TABLE tbl_sample
--GO
CREATE TABLE tbl_sample
(
 [ID] INT,
 [Phone Numbers] INT
)
GO
INSERT INTO tbl_sample VALUES (1,3333333333)
GO
SELECT * FROM tbl_sample
GO
--OUTPUT

ID Phone Numbers
———– ————-
1 3333333333

(1 row(s) affected)

SOLUTION :
In the solution, we will use FORMAT function and provide a custom format of telephone number such that,  the Format function will automatically convert it into custom format.
Given below is the script.

--This script is compatible with SQL Server 2012 and above.
USE tempdb
GO
SELECT
 [Phone Numbers]
,FORMAT([Phone Numbers],'###-###-####') AS [Formatted Phone]
FROM tbl_sample
UNION ALL
SELECT
 [Phone Numbers]
,FORMAT([Phone Numbers],'(###) ###-####') AS [Formatted Phone]
FROM tbl_sample
GO
--OUTPUT

Format_phone_number.1.1

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Statistics is very helpful when it comes to performance because query optimizer uses these statistics to create query plans to improve query performance. I recently implemented the statistics on memory optimized table and given below are my findings.

S.No

Disk based tables

Memory Optimized tables

1

Statistics are updated automatically.

Statistics are NOT  updated automatically

2

It uses by default sampled statistics.

It has no default statistics, you must specify fullscan option.

3

It supports sampled statistics & fullscan options.

It supports ONLY fullscan option.

Following are the steps you must be cognizant of while implementing statistics in memory optimized tables :

  1. First of all create memory optimized tables and indexes.
  2. After that, insert (update, delete) data into the memory optimized tables.
  3. Once you are done with the data manipulation, update statistics on the memory optimized tables. (Do not do this step in the peak hour)
  4. The last step is to create natively compiled stored procedures that access the memory tables.

Given below is the script to update memory optimized table statistics.

USE hkNorthwind
GO
UPDATE STATISTICS dbo.tbl_Product_Master WITH FULLSCAN, NORECOMPUTE

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I came across this error message in SQL Server 2012 using Format function, after that I did some research about this error message and came across that this error was part of SQL Server since 2005 or may be earlier than that. But the method to fix this error is same across the versions. Given below are the details & fixes of this error.

Message Number: 8116

Severity : 16

Error Message: Argument data type %ls is invalid for argument %d of %ls function.

Error Generation:
In the following example, I have date in varchar format and I am trying to format it into ARABIC culture using Format function.
Given below is the script.

USE tempdb
GO
DECLARE @Varchar_Date AS varchar(11)
SET @Varchar_Date='2013-12-12'
SELECT FORMAT (@Varchar_Date,'D','ar-SA') AS [Arabic Culture]
GO
--OUTPUT

Msg 8116, Level 16, State 1, Line 3
Argument data type varchar is invalid for argument 1 of format function.

Ooopps…… I cannot convert the date into Arabic format.

Resolution:
Basically, the reason for this error is not Format function exactly.  You can come across this error in any built-in function which accepts any argument(s). The resolution to this error is that you need to check the syntax of that particular function and see what type of data type it accepts, in which which argument(s). In our case it is Format function, it accepts three arguments and the first argument must be either Number or date time but we passed as varchar. So we need to change this varchar data type to datetime  data type and pass it to Format function.
Given below is the correct script.

USE tempdb
GO
DECLARE @Varchar_Date AS varchar(11)
DECLARE @Date AS datetime
SET @Varchar_Date='2013-12-12'
Set @Date=CONVERT(datetime,@Varchar_Date)
SELECT FORMAT (@Date,'D','ar-SA') AS [Arabic Culture]
GO
--OUTPUT

Arabic Culture
————–
09/صفر/1435

(1 row(s) affected)

Conclusion :
Remember, whenever you come across this error, you must consider the argument(s)’s data types of the function and whatever data types it accepts, you must pass exactly the same data type to that particular function.

Let me know if you came across this error and fixed it in a different way.

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In my earlier articles, I wrote about how to insert buit-in code snippet in SQL Server script. But sometimes due to the requirements, we need to create our own custom snippet. Once you create the custom snippet(s) , you need to register these snippets, because without registration you cannot use in the SQL Server Query editor.

There are two ways two register the code snippet. Given below are the details.

Method 1 :
In this method, you can add folder having code snippet file(s). The advantage of this method is that you do not need to do one by one code snippet files.
Let me explain it step by step.

Step 1 :
In this step, browse the Tools menu and select the Code Snippet Manager as shown in the picture below.

how_to_register.1.1

It will open the code snippet manager as shown in the picture below.

how_to_register.1.2

Step 2 :
As you can see above, multiple built-in folders and snippet files for standard objects code snippets are available in the Code Snippet Manager. Now, you need to add custom folder and snippet files in the Code snippet Manager. Click on the Add.. button as shown in the picture below.

how_to_register.1.3

Step 3 :
Once you click on the Add.. button, it will open the files explorer, now you need to select the folders having snippet files.You cannot select an individual file using Add.. button. Just to explain this registration, I created one folder namely Custom and placed few code snippet file in it. Once you select the folder click on Select Folder button as shown in the picture below.

how_to_register.1.4

Step 4 :
Now, you can see that custom folder and snippet files are registered and added in the Code Snippet Manager as shown in the picture below.

how_to_register.1.5

Method 2 :
In this method you can add multiple files into any custom folders.
Let me explain this method step by step.

Step 1 :
This step will be same as method 1.

Step 2 :
Once you are in the Code Snippet Manager, click on Import button as shown in the picture below.

how_to_register.1.6

Step 3 :
Once you click on Import button, it will open an explorer and allow you to select code snippet file(s).
Once you selected the file(s), click on Open button as shown in the picture below.

how_to_register.1.7

Step 3 :
Once you select the code snippet file(s), it will open an another import window and ask in which custom folder you want to add this file(s) as shown in the picture below.

how_to_register.1.8

Step 4 :
Once you select any custom folder for the code snippet file(s), click Finish button. The snippet file(s) will be available in that custom folder as shown in the image below.

how_to_register.1.9

Reference : MSDN

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After publishing a solution how to recover the modified / updated records without backup in one of my previous articles, I received lot of queries inquiring how to find who modified / updated and at what time ? So, I started my research and recently developed the solution.

Before proceeding with the solution, let me create a sample to demonstrate the solution.
Given below is the script.

--Create Table
CREATE TABLE [dbo].[Student](
      [Sno] [int] NOT NULL,
      [Student ID] nvarchar(6) Not NULL ,
      [Student name] [varchar](50) NOT NULL,
      [Date of Birth]  datetime not null,
      [Weight] [int] NULL)
GO
--Inserting data into table

Insert into dbo.[Student] values (1,'STD001','Bob','2003-12-31',40)
Insert into dbo.[Student] values (2,'STD002','Alexander','2004-11-15',35)
GO

--Check the existence of the data
Select * from dbo.[Student]
GO
--OUTPUT

Who modified at what time 1.1

--Modified the date by mistake without where clause
Update [Student] Set [Student Name]='Bob jerry'
GO

--Verify the data has been modified
Select * from dbo.[Student]

GO
--OUTPUT

Who modified at what time 1.2

Solution :
Given below is the stored procedure that you need to execute in the database having modified records.

--DROP PROCEDURE Recover_Modified_Data_Proc
--GO
Create PROCEDURE Recover_Modified_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 @parms nvarchar(1024)
DECLARE @Fileid INT
DECLARE @Pageid INT
DECLARE @Slotid INT
DECLARE @RowLogContents0 VARBINARY(8000)
DECLARE @RowLogContents1 VARBINARY(8000)
DECLARE @RowLogContents3 VARBINARY(8000)
DECLARE @RowLogContents3_Var VARCHAR(MAX)
 
DECLARE @RowLogContents4 VARBINARY(8000)
DECLARE @LogRecord VARBINARY(8000)
DECLARE @LogRecord_Var VARCHAR(MAX)
 
DECLARE @ConsolidatedPageID VARCHAR(MAX)
DECLARE @AllocUnitID BIGINT
DECLARE @TransactionID VARCHAR(MAX)
DECLARE @TrID SYSNAME
DECLARE @Operation VARCHAR(MAX)
DECLARE @DatabaseCollation VARCHAR(MAX)
 
 
/*  Pick The actual data
*/
DECLARE @temppagedata TABLE
(
[ParentObject] SYSNAME,
[Object] SYSNAME,
[Field] SYSNAME,
[Value] SYSNAME)
 
DECLARE @pagedata TABLE
(
[Page ID] SYSNAME,
[AllocUnitId] BIGINT,
[Tr ID] SYSNAME,
[ParentObject] SYSNAME,
[Object] SYSNAME,
[Field] SYSNAME,
[Value] SYSNAME)
 
 
    DECLARE Page_Data_Cursor CURSOR FOR
    /*We need to filter LOP_MODIFY_ROW,LOP_MODIFY_COLUMNS from log for modified records & Get its Slot No, Page ID & AllocUnit ID*/
    SELECT [PAGE ID],[Slot ID],[AllocUnitId],[Transaction 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 Operation IN ('LOP_MODIFY_ROW','LOP_MODIFY_COLUMNS')  AND [Context] IN ('LCX_HEAP','LCX_CLUSTERED')
    /*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]='UPDATE'
    AND  CONVERT(NVARCHAR(11),[Begin Time]) BETWEEN @Date_From AND @Date_To)
 
    /****************************************/
 
    GROUP BY [PAGE ID],[Slot ID],[AllocUnitId],[Transaction ID]
    ORDER BY [Slot ID]    
  
    OPEN Page_Data_Cursor
 
    FETCH NEXT FROM Page_Data_Cursor INTO @ConsolidatedPageID, @Slotid,@AllocUnitID,@TrID
 
    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) 
                     
        DELETE @temppagedata
        -- Now we need to get the actual data (After modification) from the page
        INSERT INTO @temppagedata EXEC( 'DBCC PAGE(' + @DataBase_Name + ', ' + @fileid + ', ' + @pageid + ', 3) with tableresults,no_infomsgs;'); 
        -- Add Page Number and allocUnit ID in data to identity which one page it belongs to.                    
        INSERT INTO @pagedata SELECT @ConsolidatedPageID,@AllocUnitID,@TrID,[ParentObject],[Object],[Field] ,[Value] FROM @temppagedata
 
        FETCH NEXT FROM Page_Data_Cursor INTO  @ConsolidatedPageID, @Slotid,@AllocUnitID,@TrID
    END
 
CLOSE Page_Data_Cursor
DEALLOCATE Page_Data_Cursor
 
DECLARE @Newhexstring VARCHAR(MAX);
 

DECLARE @ModifiedRawData TABLE
(
  [ID] INT IDENTITY(1,1),
  [PAGE ID] VARCHAR(MAX),
  [Slot ID] INT,
  [AllocUnitId] BIGINT,
  [Tr ID] sysname,
  [RowLog Contents 0_var] VARCHAR(MAX),
  [RowLog Contents 0] VARBINARY(8000)
)
--The modified 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],[Slot ID],[AllocUnitId],[Tr ID]
,[RowLog Contents 0_var])
SELECT B.[PAGE ID],A.[Slot ID],A.[AllocUnitId],A.[Transaction ID]
,(
SELECT REPLACE(STUFF((SELECT REPLACE(SUBSTRING([VALUE],CHARINDEX(':',[Value])+1,48),'†','')
FROM @pagedata C  WHERE B.[Page ID]= C.[Page ID] And A.[Slot ID] =LTRIM(RTRIM(SUBSTRING(C.[ParentObject],5,3))) And [Object] Like '%Memory Dump%'
Group By [Value] FOR XML PATH('') ),1,1,'') ,' ','')
) AS [Value]
 
FROM sys.fn_dblog(NULL, NULL) A
INNER JOIN @pagedata B On A.[PAGE ID]=B.[PAGE ID]
AND A.[AllocUnitId]=B.[AllocUnitId]
AND A.[Slot ID] =LTRIM(RTRIM(Substring(B.[ParentObject],5,3)))
AND B.[Object] Like '%Memory Dump%'
WHERE A.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','LOP_MODIFY_COLUMNS') AND [Context] IN ('LCX_HEAP','LCX_CLUSTERED')
/*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]='UPDATE'
AND  CONVERT(NVARCHAR(11),[Begin Time]) BETWEEN @Date_From AND @Date_To)
 
/****************************************/
GROUP BY B.[PAGE ID],A.[Slot ID],A.[AllocUnitId],A.[Transaction ID]
ORDER BY [Slot ID]
 
 
-- Convert the hex value data in string, convert it into Hex value as well. 
UPDATE @ModifiedRawData  SET [RowLog Contents 0] = cast('' AS XML).value('xs:hexBinary(substring(sql:column("[RowLog Contents 0_var]"), 0) )', 'varbinary(max)')
FROM @ModifiedRawData
 
---Now we have modifed data plus its slot ID , page ID and allocunit as well.
--After that we need to get the old values before modfication, these datas are in chunks.
DECLARE Page_Data_Cursor CURSOR FOR
 
SELECT [PAGE ID],[Slot ID],[AllocUnitId],[Transaction ID],[RowLog Contents 0], [RowLog Contents 1],[RowLog Contents 3],[RowLog Contents 4]
,SUBSTRING ([Log Record],[Log Record Fixed Length],([Log Record Length]+1)-([Log Record Fixed Length])) AS [Log Record]
,Operation
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','LOP_MODIFY_COLUMNS') AND [Context] IN ('LCX_HEAP','LCX_CLUSTERED')
/*Use this sub query 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]='UPDATE'
AND  CONVERT(NVARCHAR(11),[Begin Time]) BETWEEN @Date_From AND @Date_To)
 
/****************************************/
ORDER BY [Slot ID],[Transaction ID] DESC
 
OPEN Page_Data_Cursor
 
    FETCH NEXT FROM Page_Data_Cursor INTO @ConsolidatedPageID, @Slotid,@AllocUnitID,@TransactionID,@RowLogContents0,@RowLogContents1,@RowLogContents3,@RowLogContents4,@LogRecord,@Operation
    WHILE @@FETCH_STATUS = 0
    BEGIN
           IF @Operation ='LOP_MODIFY_ROW' 
              BEGIN
                      /* If it is @Operation Type is 'LOP_MODIFY_ROW' then it is very simple to recover the modified data. The old data is in [RowLog Contents 0] Field and modified data is in [RowLog Contents 1] Field. Simply replace it with the modified data and get the old data.
                      */
                      INSERT INTO @ModifiedRawData ([PAGE ID],[Slot ID],[AllocUnitId],[Tr ID],[RowLog Contents 0_var]) 
                      SELECT TOP 1  @ConsolidatedPageID AS [PAGE ID],@Slotid AS [Slot ID],@AllocUnitID AS [AllocUnitId],@TransactionID AS [Tr ID]
                      ,REPLACE (UPPER([RowLog Contents 0_var]),UPPER(CAST('' AS XML).value('xs:hexBinary(sql:variable("@RowLogContents1") )', 'varchar(max)')),UPPER(cast('' AS XML).value('xs:hexBinary(sql:variable("@RowLogContents0") )', 'varchar(max)'))) AS [RowLog Contents 0_var]
                      FROM  @ModifiedRawData WHERE [PAGE ID]=@ConsolidatedPageID And [Slot ID]=@Slotid And [AllocUnitId]=@AllocUnitID ORDER BY [ID] DESC
 
                      --- Convert the old data which is in string format to hex format.
                      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 [Slot ID]=@SlotID
 
              END
         IF @Operation ='LOP_MODIFY_COLUMNS'                   
             BEGIN
 
                          /* If it is @Operation Type is 'LOP_MODIFY_ROW' then we need to follow a different procedure to recover modified
                             .Because this time the data is also in chunks but merge with the data log.
                          */
                            --First, we need to get the [RowLog Contents 3] Because in [Log Record] field the modified data is available after the [RowLog Contents 3] data.
                            SET @RowLogContents3_Var=cast('' AS XML).value('xs:hexBinary(sql:variable("@RowLogContents3") )', 'varchar(max)')
                            SET @LogRecord_Var =cast('' AS XML).value('xs:hexBinary(sql:variable("@LogRecord"))', 'varchar(max)')
            
                            DECLARE @RowLogData_Var VARCHAR(Max)
                            DECLARE @RowLogData_Hex VARBINARY(Max)
                            ---First get the modifed data chunks in string format 
                            SET @RowLogData_Var = SUBSTRING(@LogRecord_Var, CHARINDEX(@RowLogContents3_Var,@LogRecord_Var) +LEN(@RowLogContents3_Var) ,LEN(@LogRecord_Var))
                            --Then convert it into the hex values.
                            SELECT @RowLogData_Hex=CAST('' AS XML).value('xs:hexBinary( substring(sql:variable("@RowLogData_Var"),0) )', 'varbinary(max)')
                            FROM (SELECT CASE SUBSTRING(@RowLogData_Var, 1, 2) WHEN '0x' THEN 3 ELSE 0 END) AS t(pos)
                            DECLARE @TotalFixedLengthData INT 
                            DECLARE @FixedLength_Offset INT
                            DECLARE @VariableLength_Offset INT
                            DECLARE @VariableLength_Offset_Start INT
                            DECLARE @VariableLengthIncrease INT
                            DECLARE @FixedLengthIncrease INT
                            DECLARE @OldFixedLengthStartPosition INT
                            DECLARE @FixedLength_Loc INT
                            DECLARE @VariableLength_Loc INT
                            DECLARE @FixedOldValues VARBINARY(MAX)
                            DECLARE @FixedNewValues VARBINARY(MAX)
                            DECLARE @VariableOldValues VARBINARY(MAX)
                            DECLARE @VariableNewValues VARBINARY(MAX)
                         
                            -- Before recovering the modfied data we need to get the total fixed length data size and start position of the varaible data
                             
                            SELECT TOP 1 @TotalFixedLengthData=CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0] , 2 + 1, 2)))) 
                            ,@VariableLength_Offset_Start=CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0] , 2 + 1, 2))))+5+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))
                            FROM @ModifiedRawData
                            ORDER BY [ID] DESC
 
                            SET @FixedLength_Offset= CONVERT(BINARY(2),REVERSE(CONVERT(BINARY(4),(@RowLogContents0))))--)
                            SET @VariableLength_Offset=CONVERT(int,CONVERT(BINARY(2),REVERSE(@RowLogContents0)))
                             
                            /* We already have modified data chunks in @RowLogData_Hex but this data is in merge format (modified plus actual data)
                              So , here we need [Row Log Contents 1] field , because in this field we have the data length both the modified and actual data
                               so this length will help us to break it into original and modified data chunks.
                            */
                            SET @FixedLength_Loc= CONVERT(INT,SUBSTRING(@RowLogContents1,1,1))
                            SET @VariableLength_Loc =CONVERT(INT,SUBSTRING(@RowLogContents1,3,1))
 
                            /*First , we need to break Fix length data actual with the help of data length  */ 
                            SET @OldFixedLengthStartPosition= CHARINDEX(@RowLogContents4,@RowLogData_Hex)
                            SET @FixedOldValues = SUBSTRING(@RowLogData_Hex,@OldFixedLengthStartPosition,@FixedLength_Loc)
                            SET @FixedLengthIncrease = (CASE WHEN (Len(@FixedOldValues)%4)=0 THEN 1 ELSE (4-(LEN(@FixedOldValues)%4))  END)
                            /*After that , we need to break Fix length data modified data with the help of data length  */
                            SET @FixedNewValues =SUBSTRING(@RowLogData_Hex,@OldFixedLengthStartPosition+@FixedLength_Loc+@FixedLengthIncrease,@FixedLength_Loc) 
 
                            /*Same we need to break the variable data with the help of data length*/
                            SET @VariableOldValues =SUBSTRING(@RowLogData_Hex,@OldFixedLengthStartPosition+@FixedLength_Loc+@FixedLengthIncrease+@FixedLength_Loc+(@FixedLengthIncrease),@VariableLength_Loc)
                            SET @VariableLengthIncrease =  (CASE WHEN (LEN(@VariableOldValues)%4)=0 THEN 1 ELSE (4-(Len(@VariableOldValues)%4))+1  END) 
                            SET @VariableOldValues =(CASE WHEN @VariableLength_Loc =1 THEN  @VariableOldValues+0x00 ELSE @VariableOldValues END)
                 
                            SET @VariableNewValues =SUBSTRING(SUBSTRING(@RowLogData_Hex,@OldFixedLengthStartPosition+@FixedLength_Loc+@FixedLengthIncrease+@FixedLength_Loc+(@FixedLengthIncrease-1)+@VariableLength_Loc+@VariableLengthIncrease,Len(@RowLogData_Hex)+1),1,Len(@RowLogData_Hex)+1) --LEN(@VariableOldValues)
                            
                            /*here we need to replace the fixed length &  variable length actaul data with modifed data 
                            */ 
                             
                            SELECT TOP 1 @VariableNewValues=CASE
                            WHEN CHARINDEX(SUBSTRING(@VariableNewValues,0,LEN(@VariableNewValues)+1),[RowLog Contents 0])<>0 THEN SUBSTRING(@VariableNewValues,0,LEN(@VariableNewValues)+1)
                            WHEN CHARINDEX(SUBSTRING(@VariableNewValues,0,LEN(@VariableNewValues)),[RowLog Contents 0])<>0 THEN  SUBSTRING(@VariableNewValues,0,LEN(@VariableNewValues))
                            WHEN CHARINDEX(SUBSTRING(@VariableNewValues,0,LEN(@VariableNewValues)-1),[RowLog Contents 0])<>0 THEN SUBSTRING(@VariableNewValues,0,LEN(@VariableNewValues)-1)--3 --Substring(@VariableNewValues,0,Len(@VariableNewValues)-1)
                            WHEN CHARINDEX(SUBSTRING(@VariableNewValues,0,LEN(@VariableNewValues)-2),[RowLog Contents 0])<>0 THEN SUBSTRING(@VariableNewValues,0,LEN(@VariableNewValues)-2)
                            WHEN CHARINDEX(SUBSTRING(@VariableNewValues,0,LEN(@VariableNewValues)-3),[RowLog Contents 0])<>0 THEN SUBSTRING(@VariableNewValues,0,LEN(@VariableNewValues)-3) --5--Substring(@VariableNewValues,0,Len(@VariableNewValues)-3)
                            END
                            FROM @ModifiedRawData  WHERE [Slot ID]=@SlotID  ORDER BY [ID] DESC
                                          
                            INSERT INTO @ModifiedRawData ([PAGE ID],[Slot ID],[AllocUnitId],[Tr ID],[RowLog Contents 0_var],[RowLog Contents 0]) 
                            SELECT TOP 1  @ConsolidatedPageID AS [PAGE ID],@Slotid AS [Slot ID],@AllocUnitID AS [AllocUnitId],@TransactionID,NULL
                            ,CAST(REPLACE(SUBSTRING([RowLog Contents 0],0,@TotalFixedLengthData+1),@FixedNewValues, @FixedOldValues) AS VARBINARY(max))
                            + SUBSTRING([RowLog Contents 0], @TotalFixedLengthData + 1, 2)
                            + SUBSTRING([RowLog Contents 0], @TotalFixedLengthData + 3, CONVERT(INT, CEILING(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0], @TotalFixedLengthData + 1, 2))))/8.0)))
                            + SUBSTRING([RowLog Contents 0], @TotalFixedLengthData + 3 + CONVERT(INT, CEILING(CONVERT(INT, CONVERT(BINARY(2), REVERSE(SUBSTRING([RowLog Contents 0], @TotalFixedLengthData + 1, 2))))/8.0)), 2)
                            + SUBSTRING([RowLog Contents 0],@VariableLength_Offset_Start,(@VariableLength_Offset-(@VariableLength_Offset_Start-1)))
                            + CAST(REPLACE(SUBSTRING([RowLog Contents 0],@VariableLength_Offset+1,LEN(@VariableNewValues))
                            , @VariableNewValues
                            , @VariableOldValues) AS VARBINARY) 
                            + Substring([RowLog Contents 0],@VariableLength_Offset+LEN(@VariableNewValues)+1,LEN([RowLog Contents 0]))
                            FROM @ModifiedRawData  WHERE [Slot ID]=@SlotID  ORDER BY [ID] DESC
                            
             END
 
        FETCH NEXT FROM Page_Data_Cursor INTO   @ConsolidatedPageID, @Slotid,@AllocUnitID,@TransactionID,@RowLogContents0,@RowLogContents1,@RowLogContents3,@RowLogContents4,@LogRecord,@Operation
    END
 
CLOSE Page_Data_Cursor
DEALLOCATE Page_Data_Cursor
 
DECLARE @RowLogContents VARBINARY(8000)
Declare @AllocUnitName NVARCHAR(Max)
Declare @SQL NVARCHAR(Max)
 

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
(
    [ID] INT IDENTITY(1,1),
    [RowLogContents]    VARBINARY(8000),
    [AllocUnitID]       BIGINT,
    [Tr ID] sysname			  ,	
    [Transaction ID]    NVARCHAR(Max),
    [Slot ID]           INT,
    [FixedLengthData]   SMALLINT,
    [TotalNoOfCols]     SMALLINT,
    [NullBitMapLength]  SMALLINT,
    [NullBytes]         VARBINARY(8000),
    [TotalNoofVarCols]  SMALLINT,
    [ColumnOffsetArray] VARBINARY(8000),
    [VarColumnStart]    SMALLINT,
    [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] 
 
,[Tr ID]
,[ID] AS [Transaction ID]  
 
,[Slot ID] as [Slot 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 (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 (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 (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 (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 (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]
From @ModifiedRawData
 
),
 
---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]
        ,[Tr ID]
        ,[Transaction ID]
        ,[Slot ID]
        ,[FixedLengthData]
        ,[TotalNoOfCols]
        ,[NullBitMapLength]
        ,[NullBytes]
        ,[TotalNoofVarCols]
        ,[ColumnOffsetArray]
        ,[VarColumnStart]
         --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
 
CREATE TABLE [#temp_Data]
(
   
    [FieldName]  VARCHAR(MAX) COLLATE database_default NOT NULL,
    [FieldValue] VARCHAR(MAX) COLLATE database_default NULL,
    [Rowlogcontents] VARBINARY(8000),
    [Transaction ID] VARCHAR(MAX) COLLATE database_default NOT NULL,
    [Tr ID] SYSNAME,
    [Slot ID] INT,
    [NonID] INT
    --[System_type_id] int
)
---Create common table expression and join it with the rowdata table
--to get each column details
;With CTE AS (
/*This part is for variable data columns*/
SELECT
A.[ID],
Rowlogcontents,
[Transaction ID],
[Tr ID],
[Slot ID],
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,
--Calculate the variable column size from the variable column offset array
(CASE WHEN leaf_offset<1 and SUBSTRING([nullBitMap], cols.leaf_null_bit, 1)=0 THEN
CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE (SUBSTRING ([ColumnOffsetArray], (2 * leaf_offset*-1) - 1, 2)))) ELSE 0 END) AS [Column value Size],
 
---Calculate the column length
(CASE WHEN leaf_offset<1 and SUBSTRING([nullBitMap], cols.leaf_null_bit, 1)=0 THEN  CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE (SUBSTRING ([ColumnOffsetArray], (2 * (leaf_offset*-1)) - 1, 2))))
- ISNULL(NULLIF(CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE (SUBSTRING ([ColumnOffsetArray], (2 * ((leaf_offset*-1) - 1)) - 1, 2)))), 0), [varColumnStart])
ELSE 0 END) AS [Column Length]
 
--Get the Hexa decimal value from the RowlogContent
--HexValue of the variable column=Substring([Column value Size] - [Column Length] + 1,[Column Length])
--This is the data of your column but in the Hexvalue
,CASE WHEN SUBSTRING([nullBitMap], cols.leaf_null_bit, 1)=1 THEN NULL ELSE
SUBSTRING(Rowlogcontents,((CASE WHEN leaf_offset<1 and SUBSTRING([nullBitMap], cols.leaf_null_bit, 1)=0 THEN CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE (SUBSTRING ([ColumnOffsetArray], (2 * leaf_offset*-1) - 1, 2)))) ELSE 0 END)
- ((CASE WHEN leaf_offset<1 and SUBSTRING([nullBitMap], cols.leaf_null_bit, 1)=0 THEN  CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE (SUBSTRING ([ColumnOffsetArray], (2 * (leaf_offset*-1)) - 1, 2))))
- ISNULL(NULLIF(CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE (SUBSTRING ([ColumnOffsetArray], (2 * ((leaf_offset*-1) - 1)) - 1, 2)))), 0), [varColumnStart])
ELSE 0 END))) + 1,((CASE WHEN leaf_offset<1 and SUBSTRING([nullBitMap], cols.leaf_null_bit, 1)=0 THEN  CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE (SUBSTRING ([ColumnOffsetArray], (2 * (leaf_offset*-1)) - 1, 2))))
- ISNULL(NULLIF(CONVERT(SMALLINT, CONVERT(BINARY(2), REVERSE (SUBSTRING ([ColumnOffsetArray], (2 * ((leaf_offset*-1) - 1)) - 1, 2)))), 0), [varColumnStart])
ELSE 0 END))) END AS hex_Value
 
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 
A.[ID],
Rowlogcontents,
[Transaction ID],
[Tr ID],
[Slot ID],
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 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
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 )
 
--Converting data from Hexvalue to its orgional datatype.
--Implemented datatype conversion mechanism for each datatype
--Select * from sys.columns Where [object_id]=object_id('' + @SchemaName_n_TableName + '')
--Select * from CTE
 
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),REPLACE(hex_Value, 0x00, 0x20))))  --VARCHAR,CHAR
 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 IN( 40) Then CONVERT(VARCHAR(MAX),CONVERT(DATE,CONVERT(VARBINARY(8000),(hex_Value))),100) --DATE This datatype only works for SQL Server 2008
 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), CAST(CONVERT(NUMERIC(38,30), CONVERT(VARBINARY,CONVERT(VARBINARY,xprec)+CONVERT(VARBINARY,xscale))+CONVERT(VARBINARY(1),0) + hex_Value) as FLOAT)) --- NUMERIC
 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 =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)) --- DECIMAL
 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 =36 THEN CONVERT(VARCHAR(MAX),CONVERT(UNIQUEIDENTIFIER,hex_Value)) --UNIQUEIDENTIFIER
 END AS FieldValue
,[Rowlogcontents]
,[Transaction ID]
,[Tr ID]
,[Slot ID]
,[ID]
FROM CTE ORDER BY nullbit
 
/*Create Update statement*/
/*Now we have the modified and actual data as well*/
/*We need to create the update statement in case of recovery*/

 
;With CTE AS (SELECT
(CASE
WHEN system_type_id In (167,175,189) THEN QUOTENAME([Name]) + '=' + ISNULL(+ '''' + [A].[FieldValue]+ '''','NULL')+ ' ,'+' '
WHEN system_type_id In (231,239) THEN  QUOTENAME([Name]) + '='  + ISNULL(+ 'N''' +[A].[FieldValue]+ '''','NULL')+ ' ,'+''
WHEN system_type_id In (58,40,61,36) THEN QUOTENAME([Name]) + '='  + ISNULL(+  ''''+[A].[FieldValue]+ '''','NULL') + '  ,'+' '
WHEN system_type_id In (48,52,56,59,60,62,104,106,108,122,127) THEN QUOTENAME([Name]) + '='  + ISNULL([A].[FieldValue],'NULL')+ ' ,'+' '
END) as [Field]
,A.[Slot ID]
,A.[Transaction ID] as [Transaction ID]
,A.[tr ID]
,'D' AS [Type] 
,[A].Rowlogcontents
,[A].[NonID]
FROM #temp_Data AS [A]
INNER JOIN #temp_Data AS [B] ON [A].[FieldName]=[B].[FieldName]
AND [A].[Slot ID]=[B].[Slot ID]
--And [A].[Transaction ID]=[B].[Transaction ID]+1
AND [B].[Transaction ID]=  (SELECT Min(Cast([Transaction ID] as int)) as [Transaction ID]  FROM #temp_Data AS [C]
WHERE [A].[Slot ID]=[C].[Slot ID]
GROUP BY [Slot ID])
INNER JOIN sys.columns [D] On  [object_id]=object_id('' + @SchemaName_n_TableName + '')
AND A.[Fieldname] = D.[name]
WHERE ISNULL([A].[FieldValue],'')<>ISNULL([B].[FieldValue],'')
UNION ALL
 
SELECT(CASE
WHEN system_type_id In (167,175,189) THEN QUOTENAME([Name]) + '=' + ISNULL(+ '''' + [A].[FieldValue]+ '''','NULL')+ ' AND '+''
WHEN system_type_id In (231,239) THEN  QUOTENAME([Name]) + '='+ ISNULL(+ 'N''' +[A].[FieldValue]+ '''','NULL')+ ' AND '+''
WHEN system_type_id In (58,40,61,36) THEN QUOTENAME([Name]) + '=' + ISNULL(+  ''''+[A].[FieldValue]+ '''','NULL') + ' AND '+''
WHEN system_type_id In (48,52,56,59,60,62,104,106,108,122,127) THEN QUOTENAME([Name]) + '='  + ISNULL([A].[FieldValue],'NULL') + ' AND '+''
END) AS [Field]
,A.[Slot ID]
,A.[Transaction ID] AS [Transaction ID]
,A.[tr ID]
,'S' AS [Type]
,[A].Rowlogcontents
,[A].[NonID]
FROM #temp_Data AS [A]
INNER JOIN #temp_Data AS [B] ON [A].[FieldName]=[B].[FieldName]
AND [A].[Slot ID]=[B].[Slot ID]
--And [A].[Transaction ID]=[B].[Transaction ID]+1
AND [B].[Transaction ID]=  (SELECT Min(Cast([Transaction ID] as int)) as [Transaction ID] FROM #temp_Data AS [C]
WHERE [A].[Slot ID]=[C].[Slot ID]
GROUP BY [Slot ID])
INNER JOIN sys.columns [D] ON  [object_id]=object_id('' + @SchemaName_n_TableName + '')
AND [A].[Fieldname]=D.[name]
WHERE ISNULL([A].[FieldValue],'')=ISNULL([B].[FieldValue],'')
AND A.[Transaction ID] NOT IN (SELECT Min(Cast([Transaction ID] as int)) as [Transaction ID] FROM #temp_Data AS [C]
WHERE [A].[Slot ID]=[C].[Slot ID]
GROUP BY [Slot ID])
)
 
,CTEUpdateQuery AS (SELECT 'UPDATE ' +  @SchemaName_n_TableName +  ' SET ' + LEFT(
STUFF((SELECT ' ' + ISNULL([Field],'')+ ' ' FROM CTE B 
WHERE A.[Slot ID]=B.[Slot ID] AND A.[Transaction ID]=B.[Transaction ID] And B.[Type]='D' FOR XML PATH('') ),1,1,''), 
 
LEN(STUFF((SELECT ' ' +ISNULL([Field],'')+ ' ' FROM CTE B 
WHERE A.[Slot ID]=B.[Slot ID] AND A.[Transaction ID]=B.[Transaction ID] And B.[Type]='D' FOR XML PATH('') ),1,1,'') )-2)
 
+ '  WHERE  ' +
 
LEFT(STUFF((SELECT ' ' +ISNULL([Field],'')+ ' ' FROM CTE C 
WHERE A.[Slot ID]=C.[Slot ID] AND A.[Transaction ID]=C.[Transaction ID] And C.[Type]='S' FOR XML PATH('') ),1,1,'') ,
 
LEN(STUFF((SELECT ' ' +ISNULL([Field],'')+ ' ' FROM CTE C 
WHERE A.[Slot ID]=C.[Slot ID] AND A.[Transaction ID]=C.[Transaction ID] And C.[Type]='S' FOR XML PATH('') ),1,1,''))-4)
AS [Update Statement],
[Slot ID]
,[Transaction ID]
,A.[tr ID]
,Rowlogcontents
,[A].[NonID]
FROM CTE A
GROUP BY [Slot ID]
,[Transaction ID]
,A.[tr ID]
,Rowlogcontents
,[A].[NonID] )
 
INSERT INTO #temp_Data 
SELECT 'Update Statement',ISNULL(A.[Update Statement],''),A.[Rowlogcontents],A.[Transaction ID],A.[tr ID],A.[Slot ID],A.[NonID] FROM CTEUpdateQuery A


INSERT INTO #temp_Data 
Select 'Modified User Name',C.[name],A.[RowLogcontents],A.[Transaction ID],A.[Tr ID],A.[Slot ID], A.[NonID] from #temp_Data A
Inner Join fn_dblog(NULL,NULL) B On A.[tr ID]= B.[Transaction ID]
And B.[Operation]='LOP_BEGIN_XACT' And B.[Context]='LCX_NULL' And B.[Transaction Name]='UPDATE'
Inner Join sys.sysusers  C On B.[Transaction SID]=C.[Sid]
Where [FieldName]='Update Statement'
Group By C.[name],A.[RowLogcontents],A.[Transaction ID],A.[Tr ID],A.[Slot ID], A.[NonID]
Union ALL
Select 'Modified Date Time',B.[Begin Time],A.[RowLogcontents],A.[Transaction ID],A.[Tr ID],A.[Slot ID], A.[NonID] from #temp_Data A
Inner Join fn_dblog(NULL,NULL) B On A.[tr ID]= B.[Transaction ID]
And B.[Operation]='LOP_BEGIN_XACT' And B.[Context]='LCX_NULL' And B.[Transaction Name]='UPDATE'
Where [FieldName]='Update Statement'
Group By B.[Begin Time],A.[RowLogcontents],A.[Transaction ID],A.[Tr ID],A.[Slot ID], A.[NonID]

/**************************/
--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, '')
 
Print @FieldName
--Finally did pivot table and got the data back in the same format.
--The [Update Statement] column will give you the query that you can execute in case of recovery.
SET @sql = 'SELECT ' + @FieldName  + ',[Update Statement],[Modified User Name],[Modified Date Time] FROM #temp_Data 
PIVOT (Min([FieldValue]) FOR FieldName IN (' + @FieldName  + ',[Update Statement],[Modified User Name],[Modified Date Time])) AS pvt
Where [Transaction ID] NOT In (Select Min(Cast([Transaction ID] as int)) as [Transaction ID] from #temp_Data
Group By [Slot ID]) ORDER BY Convert(int,[Slot ID]),Convert(int,[Transaction ID])'
Print @sql
EXEC sp_executesql @sql
 
GO
--Execute the procedure like
--Recover_Modified_Data_Proc 'Database name''Schema.table name','Date from' ,'Date to'
 
----EXAMPLE #1 : FOR ALL MODIFIED RECORDS
EXEC Recover_Modified_Data_Proc 'test','dbo.Student'
GO
--EXAMPLE #2 : FOR ANY SPECIFIC DATE RANGE
EXEC Recover_Modified_Data_Proc  'test','dbo.Student','2000/01/01','9999/12/31'
--It will give you the result of all modified records.
--OUTPUT

Who modified at what time 1.3

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Whenever we do data migration from any old systems to new / upgraded systems, we usually receive data in different formats (text files, cvs, excel etc.) to insert into SQL Server.  Sometimes, due to the different formats, the additional white spaces accompany the data. These additional white spaces create problems later in the application. In this article, I will show you how to view the white spaces and a simple solution to remove them from the data, horizontally.

Let me explain this, step by step.

Step 1 :
Copy the data from any format  (text files, cvs, excel etc.) to SQL Server editor (new query window). In my case, I will copy the data from text file and paste it into SQL Server editor.

Given below is the image.

remove white space.1.1

Step 2 :
Now, you can see that the data is not in a proper order, obviously because the white spaces have accompanied the data . Let’s view the white spaces in the data using SQL Server editor.
Click on the Edit menu select Advanced and click on View White Space.
As shown in the given below image.

remove white space.1.2

Given below is the image showing white spaces.
remove white space.1.3

Step 3 :
Now, select the data from where you need to remove the white spaces horizontally (Note : If you want to remove white space from one line or from either left side or right side, just select that particular area as shown in the image below).

remove white space.1.3.1

Step 4 :
Once you select the data to remove horizontal white space, click on the Edit menu, select Advanced and click on Delete Horizontal White Space, as shown in the picture below.

remove white space.1.4

Step 5 :
Now, you can see, in less than seconds the white spaces are removed from your data without any effort.

remove white space.1.5

Let me know how you usually remove the white spaces horizontally from the data.

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Whenever you work on legacy data, you usually expect some sort of data in incorrect data types, but of course with the compatibility. Recently, I migrated one of my client’s data from legacy system to SQL Server 2012 and I came across an issue where the client had a date in varchar field and the data had been placed in dd/mm/yyyy format in that field. The data type had to be changed from varchar to datetime. Lets try to convert it from dd/mm/yyyy (varchar) to datetime.

Given below is the script.

DECLARE @Varchar_Date varchar(11)
SET @Varchar_Date='31/12/2012'
SELECT CONVERT(datetime,@Varchar_Date)
--OUTPUT

Msg 242, Level 16, State 3, Line 3
The conversion of a char data type to a datetime data type resulted in an out-of-range datetime value.

Ooopsss, you cannot convert it directly. I continued with my research. Finally resolved it. Given below is the solution.

Solution :
In this solution, we will use TRY_PARSE function introduced in SQL Server 2012. Given below is the script.

--This script is compatible with SQL Server 2012 and above.
DECLARE @Varchar_Date as varchar(11)
SET @Varchar_Date='31/12/2013'
SELECT TRY_PARSE(@Varchar_Date AS DATETIME USING 'en-GB')
As [Result]
--OUTPUT

Result
———————–
2013-12-31 00:00:00.000

(1 row(s) affected)

Let me know if you came across this issue and resolved it in a better way.
Note : For the earlier versions of SQL Servers, you can convert it like this.

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