asp.net mvc - Linq to SQL Data Concurrency - Is it safe to use only PKs? -

-

i getting error in mvc-based website surrounding data concurrency in linq sql:

"row not found or changed"

after reading several posts on here seems though accepted solution set non-primary key fields updatecheck = false in dbml designer. before taking plunge this, wanted ask, losing if this?

to honest, seems me should case, using primary key should fastest way find record anyway. assuming don't have composite pks. i'm not terribly familiar data concurrency scenarios, missing here?

thanks time!

[edit]

thanks feedback guys! give more detail, specific scenario have this:

i have article table number of fields (title, content, author, etc.). 1 of fields gets updated (anytime views article), popularity field, gets incremented every click. saw original error mentioned above when updated article text in database. navigated article on live site (which attempted update popularity field).

for starters sounds need not using shared datacontext. beyond that, maybe setting fields updatecheck never. being said, i not want article popularity not update due concurrency issue. being case, there way me ensure optimistic concurrency?

thanks again!!

i change updatecheck never on primary key(s) on entity classes in designer myself. lose notification of interim changes data since loaded it; end "last change wins" type of scenario. if ok in situation, then... fine.

there situations not thing do. instance, checking/adjusting bank account funds balance... or situation alternation field going based on calculation current value 1 of operands.


Comments

Post a Comment

Popular posts from this blog

ASP.NET/SQL find the element ID and update database -

-
basically i've got update query runs when click submit button. i have asp:repeater in page layer inside this <asp:repeater id="dgbookings" runat="server" onitemdatabound="itemdb"> <itemtemplate> <div class="bookingscontent"> <div class="bookingdetails" id="<%# databinder.eval(container.dataitem, "booking_ref") %>"> <p class="infotext"><%# databinder.eval(container.dataitem, "adults") %> <asp:linkbutton onclick="editdetails" text="edit..." runat="server"></asp:linkbutton></p> <p class="infotext"><asp:linkbutton onclick="submitdetails" text="submit..." runat="server"></asp:linkbutton></p> </div> </div> </itemtemplate> <asp:repeater> and outputs ...
Read more

jquery - appear modal windows bottom -

-
i have modal windows in application, work fine <div id="modal" class="modal hide fade" tabindex="-1" role="dialog" aria-labelledby="mymodallabel" aria-hidden="true"> but when modal appears, appear top of windows, , want appear bottom the application joomla 3.0! , using template of meet gavern any idea? i found solution i modified de css in bootstrap .modal.fade { top:-25%; -webkit-transition:opacity .3s linear, bottom .3s ease-out; -moz-transition:opacity .3s linear, bottom .3s ease-out; -ms-transition:opacity .3s linear, bottom .3s ease-out; -o-transition:opacity .3s linear, bottom .3s ease-out; transition:opacity .3s linear, bottom .3s ease-out; }
Read more

c++ - Compiling static TagLib 1.6.3 libraries for Windows -

-
i having super hard time compiling , using taglib 1.6.3 in qt project. i've tried can think of. taglib claims supported through cmake i'm not having luck. furthermore, i'm confused kinds of files need qt libs! i've built *.a files, *.lib, , *.dll. understand far... believe since i'm working in windows *.lib want. no matter do, end "undefined references" taglib functions try use when try compile qt project. have tried mingw32, msys, visual studio 2008, , cross-compiling windows on linux. turning nothing. what makes less sense me if compile same taglib source qt on mac (g++ think?) works fine! somewhere in windows compilation procedures have going wrong. have been smacking face on desk 30 (on , off) hours trying figure out. since qt uses mingw must compile taglib same compiler? if compile *.lib's visual studio not compatible? are *.a libraries usable in windows? (assuming mingw) i'm still trying handle on c++ stuff, after reading coun...
Read more