DBLOG.DatabaseLogAnalyzer can read the SQL Server transaction logs online, and return RedoSQL and UndoSQL for every transactions.

Some Tips:
1. The SQL Server to be analyzed needs 2008 or later version.
2. Target Database Recovery model must be 'Full'.
3. This module only analyze for DML transaction.
4. For develop, please install Visual Studio 2017 or later version and .NET Framework 4.8.
5. Please contact me when have any question: ap0405140@163.com

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MSSQLLogAnalyzer.exe use example:
step1: Execute MSSQLLogAnalyzer.exe.
step2: Modify [ConnectionString], change it for your environment.
       Modify [StartTime] and [EndTime] to what time range need to read logs.
       Modify [TableName], It can  be blank, when blank means read all table logs.
step3: Click [Readlog] button, wait for analysis results.

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SQLCLR use example:
--> Deployment to SQLServer with SQLCLR, Then we can use a SQL Function to readlog on SQL Server Management Studio.
use master

-- enable clr
exec sys.sp_configure 'clr enabled'

exec sys.sp_configure 'clr enabled',1

reconfigure

-- set trustworthy on
alter database [DatabaseName] set trustworthy on

use [DatabaseName]

-- function dbo.DBAReadLog
if exists(select 1 from sys.objects where name=N'DBAReadLog')
   drop function dbo.DBAReadLog

if exists(select 1 from sys.assemblies where name=N'FCLR')
   drop assembly FCLR

create assembly FCLR 
 from 'D:\MSSQLLogAnalyzer\FCLR\bin\Debug\FCLR.dll'
 with permission_set=unsafe

alter assembly FCLR add file from 'D:\MSSQLLogAnalyzer\FCLR\bin\Debug\FCLR.pdb';

create function dbo.DBAReadLog(@connectionstring nvarchar(max),
                               @dt0 nvarchar(max),
                               @dt1 nvarchar(max),
                               @obj nvarchar(max))
returns table(LSN nvarchar(max),Type nvarchar(max),TransactionID nvarchar(max),BeginTime nvarchar(max),EndTime nvarchar(max),ObjectName nvarchar(max),Operation nvarchar(max),RedoSQL nvarchar(max),UndoSQL nvarchar(max),Message nvarchar(max))
as external name FCLR.UserDefinedFunctions.DBAReadLog

-- read log
select * 
from dbo.DBAReadLog(N'server=[ServerName];database=[DatabaseName];uid=[LoginName];pwd=[Password];Connection Timeout=5;Integrated Security=false;',  -- Database connection string
                    N'2020/11/23 10:00:00',  --StartTime, example: 2020/11/23 10:00:00
                    N'2020/11/23 12:01:00',  --EndTime, example: 2020/11/23 12:01:00
                    null) t  --TableName, Need include schema name(like dbo.Table1), When blank or null means query all tables logs.
order by LSN

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DBLOG.dll use example:
step1: Start Visual Studio 2017, create a new project.
step2: Add reference DBLOG.dll to current project.
step3: At cs file header, add "using DBLOG;"
step4: Call DatabaseLogAnalyzer.ReadLog() for read logs, like below:
   string ConnectionString, StartTime, EndTime, TableName;
   DatabaseLogAnalyzer dbla;
   DatabaseLog[] logs;

   //connection string: Please change below connection string for your environment.
   ConnectionString = "server=[ServerName];database=[DatabaseName];uid=[LoginName];pwd=[Password];Connection Timeout=5;Integrated Security=false;";
   //start time for analyze, format: yyyy-MM-dd HH:mm:ss
   StartTime = "2020-03-18 10:01:02"; 
   //end time for analyze, format: yyyy-MM-dd HH:mm:ss
   EndTime = "2020-03-18 10:02:02"; 
   //table name: Need include schema name(like dbo.Table1), When blank means query all tables 's logs, you can change it for need.
   TableName = ""; 

    // Initializes a new instance of the DBLOG.DatabaseLogAnalyzer class.
    dbla = new DatabaseLogAnalyzer(ConnectionString);  
    // read logs, return a DatabaseLog array, include below properties:LSN,TransactionID,BeginTime,EndTime,ObjectName,Operation,RedoSQL,UndoSQL.
    logs = dbla.ReadLog(StartTime, EndTime, TableName);