Win a copy of JDBC Workbook this week in the JDBC and Relational Databases forum
or A Day in Code in the A Day in Code forum!
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Paul Clapham
  • Jeanne Boyarsky
  • Junilu Lacar
  • Henry Wong
Sheriffs:
  • Ron McLeod
  • Devaka Cooray
  • Tim Cooke
Saloon Keepers:
  • Tim Moores
  • Stephan van Hulst
  • Frits Walraven
  • Tim Holloway
  • Carey Brown
Bartenders:
  • Piet Souris
  • salvin francis
  • fred rosenberger

Question on transaction

 
Ranch Hand
Posts: 299
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I was asked a question in the interview..the question was like say 2 Users(say user A and user B) access a JSP page.This JSP page will display "count" and say currently the "count" value is 10.So both Users see "count" value as 10.Now this JSP has a "submit" button,and when the user clicks on that submit button,then their count should be increased by 1.Now the User A clicks on submit button,and the count increases by 1,so the count value becomes "11".But User B still sees 10,and now say User B hits submit button as well.Now instead of count increasing to "12",we should display an error message to the User B saying someone has already updated the "count" variable. How can this be achieved...

I thought either through timestamp or may be transaction..Anyone please share their views...
 
Thanks tiny ad, for helping me escape the terrible comfort of this chair.
Devious Experiments for a Truly Passive Greenhouse!
https://www.kickstarter.com/projects/paulwheaton/greenhouse-1
    Bookmark Topic Watch Topic
  • New Topic