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I have to implement java based call routing engine which route calls based on the phone number prefix to the appropriate gateway.
Is it a better approach to read the table on application startup into java objects and do everything in java without db access on each call? So if you order them alphabetically it's enough to get a list from longest to shortest, and that's what you want.
Then you can have a TreeMap (if you want order by prefix) or a HashMap (if you prefer to find the longest prefix first and keep trying with one char less each time).

I compared your query with the one from David, both execute within 44ms in my environment with 1538 entries in the call_routing table. Indexing this will be hard, but I guess the first question is, how many call prefixes are you tracking? Not the answer you're looking for?Browse other questions tagged java postgresql jdbc lookup prefix or ask your own question. In a formal paper, should I censor "brainf**k", the name of a programming language?
Why do some mobile apps have mute buttons when the device has physical mute & volume switches?

With only 1538 entries, I think caching in memory is the better approach, however when there are changes I have to reload the table.

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