Hi,

> trying to do simultaneous inserts of data that might be identical.

Could you use the MERGE statement?
http://www.h2database.com/html/grammar.html#merge

> The logic is generally:
> 1. Lookup for row with tuple,
> If found, return id

You should probably do a SELECT ... FOR UPDATE here. Unfortunately it
locks the whole table, not just the selected record.

> when the unique constraint violation
> happens it occasionally cannot locate the id.

I'm not sure what you mean here... Should H2 know the id? Your code
should know the id.

Regards,
Thomas

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