How Can I Call Custom Database Functions in Hibernate?

Calling Custom Database Functions in Hibernate

Custom database functions defined in databases like PostgreSQL can be invoked within SQL statements using syntax like:

select * from cookietable c where isValidCookie(c.cookie);

To call such functions from Hibernate, you'll need to define them appropriately in the Hibernate dialect.

Defining the Custom Function in the Dialect

Examine the source code of the Hibernate dialect you're using, such as PostgreSQLDialect. You'll find a series of registerFunction() calls for different functions. You'll need to add a new one for your custom function.

Configuring the Dialect in Hibernate

Once you've defined your custom function in the dialect, specify this dialect in your Hibernate configuration. This ensures that Hibernate uses your custom dialect and recognizes the custom function.

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