How can you call custom database functions with Hibernate?

Question

If I were to define some function in the database (perhaps Postgres, or any other database):

create or replace function isValidCookie(ckie);

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Answer 1

If you want to use your custom function in HQL, you'll need to define it in appropriate Dialect

Take a look at PostgreSQLDialect (or any other, really) source, and you'll see a bunch of registerFunction() calls. You'll need to add one more :-) - for your own custom function.

You'll then have to specify your own dialect in Hibernate configuration.