Tim Morrison
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| Posted: 03/28/2003, 11:49 AM |
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Codecharge Studio 2.0, MS-SQL 2000
If I have 2 pages - a grid and a record page.
Is there a way to lock a record if someone is looking at it?
I.e. a user opens a record for editing, I would like any other users that
try to open the same record to get an error message "This record is locked
by another user - please try again later"
Is this possible?
Tim Morrison
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Robert Rodgers
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| Posted: 03/28/2003, 1:59 PM |
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Hi Tim,
With Hints and Isolation levels you can. But I would be careful as it
limits scalablility.
Are you a clarion guy? I seem to remember your name. If you are you will
be familiar with clarion foundry.
You can see a clarion example on the clarionfoundry.com site here is a
direct link.
http://67.64.77.50/Site/paragraph.aspx?SiteName=Clarionfoundry&BodyPK=10248
This example works with ASA, ASE and MSSQL7. I haven't tried it on anything
else.
rob
--
"The average person thinks he isn't."
Larry Lorenzoni
++++++++++++++++++++++++++++++
"Tim Morrison" <sales@kjmsoftware.com> wrote in message
news:b628vu$93c$1@news.codecharge.com...
> Codecharge Studio 2.0, MS-SQL 2000
>
> If I have 2 pages - a grid and a record page.
>
> Is there a way to lock a record if someone is looking at it?
>
> I.e. a user opens a record for editing, I would like any other users that
> try to open the same record to get an error message "This record is locked
> by another user - please try again later"
>
> Is this possible?
>
> Tim Morrison
>
>
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DAVID
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| Posted: 04/03/2003, 7:41 AM |
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SELECT FOR UPDATE woun't work.
Try having an extra field in the record, say lock_session_id. In EditMode ,
before select, lookup the field's value, if not null , update it with
session ID of the requesting user. On update, set it back to NULL. and make
sure user is thrown out of the edit form, say back to the grid.
Make sure that you customize the cleanup procedure to clean stale session
IDs from the locked rows or keep yet another extra field with a lock
timestamp, to that after a certain timeout, user cannot write back ("UPDATE
table SET .... LSID=NULL,LSTM=NULL WHERE LSTM>NOW()-1 min" if records
updated <1 then show error: timed out. AND GO BACK TO CLEAN-UP THE MESS)
"Tim Morrison" <sales@kjmsoftware.com> wrote in message
news:b628vu$93c$1@news.codecharge.com...
> Codecharge Studio 2.0, MS-SQL 2000
>
> If I have 2 pages - a grid and a record page.
>
> Is there a way to lock a record if someone is looking at it?
>
> I.e. a user opens a record for editing, I would like any other users that
> try to open the same record to get an error message "This record is locked
> by another user - please try again later"
>
> Is this possible?
>
> Tim Morrison
>
>
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