Apex Code Development You need to sign in to do that
Don't have an account?
tesi Visualforce Page and Built-in Concurrency?
With standard pages concurrent editing of the same record are detected and responded with following message: "The record you were editing was modified by <user> during your edit session." This is not true for Visualforce page or web service API request (this makes sense):
How do you solve this situation when concurrency is required? Of course, we can leverage standard patterns like versioning...but this would require validation rules/workflow rules or triggers for each object we leverage in Visualforce...I cannot believe there is no standard way, isn't it?
Example how to simulate this:
1. Standard Pages
User A loads one record, like https://na12.salesforce.com/001U0000003MZzI
User B loads the same record in standard page like https://na12.salesforce.com/001U0000003MZzI
User A changes the record and saves.
User B changes as well and tries to save: "The record you were editing was modified by User A during your edit session." CORRECT!
2. Standard Page -> VF Page
User A loads one record in standard page like https://na12.salesforce.com/001U0000003MZzI
User B loads the same record in a VF page like https://na12.salesforce.com/apex/TransactionTest?id=001U0000003MZzI
User A changes the record and saves.
User B changes the record as well and saves. Record get's saved without any error message! WRONG!
Any ideas appreciated...
Best regards,
Hi,
You could probably try something like locking the record. Not sure if you'd be able to do anything in the standard pages, but in controller, you can lock a record while querying for it.
Check this out, it may help -
http://www.salesforce.com/us/developer/docs/apexcode/Content/langCon_apex_locking_statements.htm
The FOR UPDATE locking statement only works during a single transaction. Each page load is a single transaction. Therefore, it wouldn't work. Best thing I could think of would be to load LastModifiedBy/SystemModStamp, then before saving the record, reload the record and compare the values from when the page was constructed.