Most production databases are running in full recovery model, there must be transaction log backup job scheduled to run periodically. In order to reduce possible data loss, log should be backup as frequent as possible, let's say every minute. More log backups mean more files. Rather than manually restore log backups through the GUI, one at a time, you need a script-based method to automatically restore all of the log files in a directory. Below script can be used to generate RESTORE LOG statements by reading a directory which transaction log backup files reside. The log backup file time must be expressed by its file name, e.g. with a YYYYMMDDhhmmss suffix.
USE Master;
GO
SET NOCOUNT ON
-- 1 - Variable declaration
DECLARE @dbName sysname
DECLARE @backupPath NVARCHAR(500)
DECLARE @cmd NVARCHAR(500)
DECLARE @fileList TABLE (backupFile NVARCHAR(255))
DECLARE @lastFullBackup NVARCHAR(500)
DECLARE @lastDiffBackup NVARCHAR(500)
DECLARE @backupFile NVARCHAR(500)
-- 2 - Initialize variables
SET @dbName = '<UserDB>'
SET @backupPath = 'D:\LogBackup\UserDB\'
-- 3 - get list of files
SET @cmd = 'DIR /b ' + @backupPath
INSERT INTO @fileList(backupFile)
EXEC master.sys.xp_cmdshell @cmd
SELECT 'RESTORE LOG ' + @dbName + ' FROM DISK = N''' + @backupPath + backupFile + ''' WITH NORECOVERY'
FROM @fileList WHERE backupFile IS NOT NULL ORDER BY backupFile