Using Caché Objects - InterSystems Documentation

Object Concurrency
Note:
You can use this set of features to implement optimistic concurrency.
To implement a concurrency check in an SQL update statement for a class where
VERSIONPROPERTY refers to a property called InstanceVersion, the code would be something
like:
SELECT InstanceVersion,Name,SpecialRelevantField,%ID
FROM my_table
WHERE %ID = :myid
// Application performs operations on the selected row
UPDATE my_table
SET SpecialRelevantField = :newMoreSpecialValue
WHERE %ID = :myid AND InstanceVersion = :myversion
where myversion is the value of the version property selected with the original data.
204 Using Caché Objects