Solved

Getting Next Record From Text File

Posted on 2015-02-16
11
36 Views
Last Modified: 2015-03-11
I time fitness events and the software that does the actualy rfid data processing submits a text file as participants finish with entries like this:

2,3586,0,"09:59:14.720",1,2
1,3400,0,"09:59:15.782",2,1
2,3586,0,"09:59:15.783",2,2
4,3399,0,"10:00:50.260",1,4
3,3294,0,"10:00:50.750",1,3

What I want to do is repeatedly append the data in my results database with everything that has been added from where I last left off.  I am already parsing this data into an array so I can access the data points I need.  The thing that I  believe i would need is to simply get the last entry based on the time of submission (say"09:59:15.783") from my database and then get everything from there on from the text file.  Do I have to scroll through the entire file to find that entry in the text file and then pick up with the next one or is there another way?  The file could have in excess of 10,000 records in it,

Thank you.
0
Comment
Question by:Bob Schneider
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 5
  • 4
11 Comments
 
LVL 38

Expert Comment

by:Gerwin Jansen, EE MVE
ID: 40612128
10000 lines of 30 bytes would mean a 300kB file - I'd just read the whole file into an array. Then skip #lines you already have in your database (minus a few) and start searching for the last entry, any new entries you will find after that you put into your database. The above would mean that new entries only get added at the bottom of the file.
0
 

Author Comment

by:Bob Schneider
ID: 40612188
So determine the number of lines in the database, minus 10 for instance, and start there and search for the first new line?  That makes sense except that I don't take all of the lines in the text file and write to the database.

Consider a 5k.  As a runner approaches, the rfid system starts to pick up the signal from their bib/chip.  They may get read 3 or 4 times, although usually 1 or 2.  My system takes their strongest read.  With this new information, how would you modify your suggestion.  Should I create a counter that represents the number of lines that are read and just start where that number left off?  Or would it be as easy/nearly as easy and/or quick to just read through the file until we get to the last record imported into the db?
0
 

Author Comment

by:Bob Schneider
ID: 40612206
Let me amend my comment.  Which would be better from a system/efficiency/speed standpoint:

1) Read through the text file, beginning with the number of records that I have in my db (knowing that there are more than that number of lines in the text file) until I find the last value in the db and start there, or

2) Add a counter (iNumRcds) representing the actual number of records in the text file and just begin with the next one, storing that counter as a public variable.  Note that, once I closed the program, if I had to re-open it it would start at 0 (unless I stored that as a db value)

I would think 1) would be best, no?
0
Migrating Your Company's PCs

To keep pace with competitors, businesses must keep employees productive, and that means providing them with the latest technology. This document provides the tips and tricks you need to help you migrate an outdated PC fleet to new desktops, laptops, and tablets.

 
LVL 38

Expert Comment

by:Gerwin Jansen, EE MVE
ID: 40612370
About the 'strongest' reading - I'd just read every record and do the filtering / sorting later in the database or application. Never throw away raw data I would suggest. I'm assuming that your readers have their own ID so you can detect an individual runner.

I would not work with any global counter, just count the amount of records you have for that race in your database and with that number in mind, read the text file. Use the number of records as in 'index' in your text file to start reading the new records. I'd just set the counter a few records back so you don't miss that 'off by one' record. Match to the last record in your database and start reading from the next onward.

BTW: you have no commercial system that does the above for you? I've seen a few systems varying from mylaps, bibtag, ipico etc. There is always a guy with a laptop watching the results pouring in as runners are passing ;)
0
 

Author Comment

by:Bob Schneider
ID: 40612557
Thanks for the feedback.  Makes sense.  Regarding the third party (commercial) system, doing this all internally gives us the most control over our database, local event timing, web-based results, sending email results, inserting finish line pix, etc.  Our chip provider has software we can buy but, again, third party software is limiting as much as it is effective.
0
 
LVL 38

Accepted Solution

by:
Gerwin Jansen, EE MVE earned 500 total points
ID: 40612633
>> doing this all internally gives us the most control over our database ...
No argument there ;) Some recommendations: start with developing a basic system first, get all unwanted 'features' out and then start adding functionality gradually.
0
 

Author Comment

by:Bob Schneider
ID: 40612687
Thanks.  BTW your point about never throwing away raw data is a good one.  That is why we never, ever modify the text file that is generated by the rfid system.
0
 
LVL 47

Expert Comment

by:Martin Liss
ID: 40659123
I've requested that this question be closed as follows:

Accepted answer: 500 points for Gerwin Jansen's comment #a40612370

for the following reason:

This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
0
 

Author Closing Comment

by:Bob Schneider
ID: 40659124
Thank you very much for your help.
0
 
LVL 38

Expert Comment

by:Gerwin Jansen, EE MVE
ID: 40659238
You're welcome :)
0

Featured Post

PeopleSoft Has Never Been Easier

PeopleSoft Adoption Made Smooth & Simple!

On-The-Job Training Is made Intuitive & Easy With WalkMe's On-Screen Guidance Tool.  Claim Your Free WalkMe Account Now

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Logical Operator should return Integer value in SSIS 9 39
Converting Stored Procedure to SQL Statement 5 43
SQL Distinct Question 3 15
Convert time stamp to date 2 57
Load balancing is the method of dividing the total amount of work performed by one computer between two or more computers. Its aim is to get more work done in the same amount of time, ensuring that all the users get served faster.
International Data Corporation (IDC) prognosticates that before the current the year gets over disbursing on IT framework products to be sent in cloud environs will be $37.1B.
This videos aims to give the viewer a basic demonstration of how a user can query current session information by using the SYS_CONTEXT function
Via a live example, show how to setup several different housekeeping processes for a SQL Server.

726 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question