Optimistic locking may work for your application, but for some apps it's not an acceptable solution:
- When the user queries a row for editing generate a hash of said row
- When the user requests that the row is saved, regenerate the hash of the existing row. If it matches the original hash, then complete the save - otherwise let the user now that the row was changed by someone else
The problem that I've encountered with locking web apps, is that rows get checked out/locked, and then the user gets distracted, called into a meeting etc and they never remember to unlock the record. Optimistic locking solves this problem, but it may not suit your business rules
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
Posts may use any of the Perl Monks Approved HTML tags:
You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||