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Editorial Team
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Asked: 2026-06-12T03:11:41+00:00

I have more of theoretical question: When data gets inserted into a database? is

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I have more of theoretical question:
When data gets inserted into a database? is it after persist or after commit is called? Because I have a problem with unique keys (manually generated) – they get duplicate. I’m thinking this is due multiple users inserting data simultaneously into a same table.

UPDATE 1:

I generate keys in my application. Keys example: ‘123456789123’,’123456789124′,’123456789125’…

Key field is varchar type, because there are lot of old keys (I can’t delete or change them) like ‘VP123456′,’VP15S3456’. Another problem, that after inserting them into one database, these keys have to be inserted in another database. And I don’t know what are DB sequences and Atomic objects..

UPDATE 2:

These keys are used in finance documents and not as database keys. So they must be unique, but they are not used anywhere in programming as object keys.

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1 Answer

  1. Editorial Team

    I would suggest you create a Singleton that takes care of generating your keys. Make sure you can only get a new id once the singleton has initialized with the latest value from the database.

    To safeguard you from incomplete inserts into the two databases I would suggest you try to use XA transactions. This will allow you to have all-or-nothing inserts and updates. So if any of the operations on any of the databases fails, everything will be rolled back. Of course there is a downside of XA transactions; they are quite slow and not all databases and database drivers support it.

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