Solved

Transactions

Posted on 1998-08-24
3
160 Views
Last Modified: 2010-04-04
I am using SQL Server 6.5
I have a table Client and have another table managers
One client can have several managers
That's why I put the managers into another table
Now I want to achieve that When user post then let the two tables post. When user cancel the editing let the two tables
remain unchanged.
I have tried cached updates.But It locks the table and another user can't access
Is there any way to do that without locking any table
The most important thing is that making the user feel that
he or she is entering data to a single object from a single interface.
NOT : DBGrid is automatically update when you navigate on the grid!!!
0
Comment
Question by:Cumhur
  • 2
3 Comments
 

Accepted Solution

by:
KirkGray earned 40 total points
ID: 1337635
Use a TUpdatesql component.  This allows you to write the sql inserts, updates and delete yourself.  the advantage of this is that you can then make the source table(s) readonly (preventing the tables from being locked when the user edits), and implement your own optimistic locking.  Let me know if you need more info.
0
 

Author Comment

by:Cumhur
ID: 1337636
What is Optimistic Locking ?
0
 

Expert Comment

by:KirkGray
ID: 1337637
It's a way of posting an update/delete based on previous values of a record.  It prevents the  "Lost update" problem.

For example, say a customer record has had a field called FirstName changed by the user from "Fred" to "Fredric".  Update it using sql like so:

Update Customers set firstname = "Fredric" where firstname = "Fred"
and CustomerID = 1

When this gets run, it will not update the record if another user has changed the firstname  of this customer.  You can test if the update worked by using the rowsaffected returned by the query.  If it = 0 then tell the user that the update failed 'cause another user changed the field values "under" them.  

For more information, see the updatemode property of the TSQL component.

Let us know if you need more info!

Cheers!

0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Delphi 10 Seattle Dataset Actions 5 78
indy tidtcpclient threading issue 8 63
Printing problem 2 80
Delphi 2 46
In this tutorial I will show you how to use the Windows Speech API in Delphi. I will only cover basic functions such as text to speech and controlling the speed of the speech. SAPI Installation First you need to install the SAPI type library, th…
Hello everybody This Article will show you how to validate number with TEdit control, What's the TEdit control? TEdit is a standard Windows edit control on a form, it allows to user to write, read and copy/paste single line of text. Usua…
This video explains how to create simple products associated to Magento configurable product and offers fast way of their generation with Store Manager for Magento tool.
Need to grow your business through quality cloud solutions? With everything required to build a cloud platform and solution, you may feel like the distance between you and the cloud is quite long. Help is here. Spend some time learning about the Con…

930 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

9 Experts available now in Live!

Get 1:1 Help Now