Multiple users viewing/editing common records

Hi all. I'm running tomcat 5.5.17. My webapp involves creating/viewing/editing/saving records from a database. Multiple users can login to the app, and so multiple users may view a record. I want to avoid two users viewing & editing the same record, and then saving. Of course, the one who saves last will dictate what actually stays in the DB.
An easy-way-out I thought of was...I can keep a list in the servlet context, and when a user views a record, add their name, the record id, and a timestamp to this list. Then, it's easy to check who has been viewing/editing a record in the last X minutes, so it's equally easy to display a warning saying "Users also viewing this record in the last 10 minutes: User1, User2, User3." Whenever I add someone to the list, I'd also remove all stale entries (ones which have been in the list for longer than X minutes).
This isn't a great way to do it, of course. Optimally, I'd want to add and remove users from this list in real-time. Adding is no problem...I can execute whatever commands I need to in the servlet/jsp to add them to the list. Removing though...how can I remove them from the list? Well...WHEN do I want to remove them? When they stop viewing the record. As in, when they browse away from the page. Javascript has a window.onbeforeunload = function() { //do stuff } function...but I can't really run any jsp through there. Unless I open a new window which runs some jsp and closes immediately, but what kind of a solution is that.
Any suggestions?

Yeah, change your requirements.
In my opinion it should be the other way around: the first user who gets the record dictates the resulting state in the database, not the last one. One way to prevent multiple users from overwriting each others changes (a very rare occurence, but possible) is to use all the fields in a record to generate a where clause for the update or delete statement.
Example:
A record exists with a name field set to 'bill gates'.
User 1 selects this record
User 2 selects the same record
User 1 changes field 'name' to 'larry laffer'
User 1 saves the changed record to the database
User 2 changes one of the fields (BUT STILL HAS 'bill gates' AS THE NAME!)
User 2 saves the changed record to the database
Now in the where clause used in the update statement for user 2, somewhere there will be and name='bill gates'. This condition is now no longer true since the name was changed by user 1. The result: the update for user 2 will fail , 0 rows updated.
A very, very rare sql exception is always better than changes being lost in my opinion.

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I have 2 computers and 2 laptops. A very simple agenda with 3 calenders. Myself my partner and the office calender. I want to publish my calender and that of my partner. The office calender I would like to sync so that we can change the office calender at any location.
I set up sync only for iCall and have a .Mac account. When I change anything on any of the calenders in iCall nothing happens on any of my other locations. Even though the locations are registered as synced. I can see the sync wheel turning but at the end of it the calenders are not synced.
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Prevent multiple users from editing/approving the same form SPD 2013,SP 2013

Hello all, I have a workflow with a to do task, the task is assigned to a group so any of the users in that group can go in and do a quality check on form data and approve it. How do I prevent multiple users from working on the
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The "Require Checkout" option is your best bet. You can also enable the auto checkout on edit option to allow minimal effort on the side of the user. Other users will then get the error message stating the item is checked out, if they try to
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If you'd like, you could add a workflow to the task list that triggers when something is changed. That workflow can check if the item is checked out and if so, email the other users assigned to the task.
I trust that answers your question...
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C
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Allow multiple users to edit in a shared calendar

Some co-workers and I have a shared calendar in Outlook 2010 (separate from our personal, individual calendars) and we'd all like to be able to edit (add, delete, etc) to it. The creator of the calendar shared it with us and gave us all the appropriate
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For example, User 1 creates and shares the calendar. User 2 and User 3 are given "editor" permissions. User 2 adds an event to the calendar for all to view, but User 1 and User 3 cannot view it.
How can we create a calendar so that User 1, User 2, and User 3 can all view and edit this shared calendar?
Thanks!

Hi,
How does User1 share the new created calendar to User2 and User3? Because the shared calendar is User2 created that is not a default Calendar, please share it by the following steps in Outlook 2010:
1. Create a new calendar in User1’s account.
2. Right-click the new calendar, click Share > Share Calendar.
3. In the Sharing invitation window, select User2 and User3 in the To field.
4. Check Recipient can add, edit and delete items in this calendar to give the recipients Editor permission.
5. Click Send to share calendar to User2 and User3.
Then User2 and User3 would receive a message in Inbox folder. They can just click
Open the Calendar button to open it. Then check whether the issue persists.
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TechNet Community Support

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What is the best way to implement this at the application or the database level?
Here are some options we have been bouncing around.
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Conceptually the 2 options are the same but one is done at the app whereas the other is at the database level.
Is there a better way to handle this scenario using transactions or some other technological option.
Thanks

Another solution involving no modification of the database structure:
As soon as a user want to access a plan, try to UPDATE the plan record... if it fails, the record was locked
by another user before. When the user has finished with the plan, you can COMMIT or ROLLBACK the changes, which will free the lock for other users.
An advantage of this solution is that if program crashes unexpectedly, there will automatically be a ROLLBACK.
Of course, you need a transaction for this... and perhaps more if you want to separate the 'locking transaction' (virtual update just for restricting access) from the 'operating transaction' (in which you will
do the DB stuff: inserts, updates, deletes, etc.)
Hope this helped,
Regards.

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Dear All
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Perhaps there’s an option involving smart previews, which I am just beginning to get my mind around?
Any asdvice you have would be MOST welcome.
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2. Keep the images (unlike the catalog) on a networked drive and edit either (a) them or (b) smart previews of them (stored, I guess, on the computer of whoever is editing them, either my wife's or mine).
Even though I have mentioned this a few times, you do NOT need smart previews if the images are available. It's an extra step, completely optional, done only for speed purposes, and to be honest, if your catalog is on a thumb drive, that may be the speed limitation, not the speed of loading photos. In addition, smart previews are stored with the catalog ... I do not think you can put them on a different drive.
3. Keep the images (unlike the catalog) on my MBP's internal ssd, and network my computer to my wife's so she can access either (a) them there (when I am around) or (b) smart previews of them.
Using the SSD for images is not going to produce speed benefits, other than trivial benefits that you probably can't even notice.
a. I take it 1 would deliver pretty good performance. I sometimes worry that it might seem mad to get an MBP with a fast internal ssd if I then don't use that ssd for images! But I guess the internal ssd will still deliver good speed simply in terms of housekeeping, I take it, even if the machine has to go to a stick for the images. Right?
I remain skeptical that a catalog on a thumb drive would produce "pretty good performance", but I admit that I have not tried. I fail to see what benefit you think you are getting from the SSD, "good speed simply in terms of housekeeping" is a phrase that I am not understanding. Yes, there are benefits to putting operating system and software on an SSD, but that's not what you are talking about, is it?
b. By contrast, I take it that 2 and 3 really would be quite sluggish on the original images option, i.e. if someone were editing original images located on a network drive (whether that's a third drive or my internal drive, with my wife editing them wirelessly). Yes?
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c. But would 2 and 3 work not only better, but pretty well, if the person editing were editing only smart previews?
Possibly, but I reject the premise that 2 and 3 are sluggish because of the location of the photos, it may be sluggish because your catalog is on a thumb drive.
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Number 2 is a very reasonable solution, even without smart previews, it is fine if you are accessing photos on a network drive. The speed limitation is the speed of accessing the catalog on the thumb drive.
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All backup strategies are best when they are automatic (i.e. don't rely on the human user to remember to do it) and backups must go on a different physical disk than the originals. Many people backup to the cloud, see for example, the commercial service called Carbonite. In your backup strategy for Lightroom, you need to make regular, automated bakcups of the images and also of the catalog file.

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Hello Guys,
and thanks for looking into this
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