> What I need to know is whether or not this is multi-user safe, i.e., will > the block of code in the procedure execute as a transaction so that if > more than one clerk creates an expense report for the same employee > simultaneously is it possible or impossible that value of the > employee.expense_report_seq gets updated by the second clerk between the > SELECT and UPDATE statements invoked by the first clerk? > > And as a follow-up, should I add the FOR UPDATE clause to the SELECT > statement?
SELECT .. FOR UPDATE would be appropriate. However, you could also do an update + 1 first and the select second to find what you changed the value to.
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