call postgres function spring boot code example

Example 1: spring boot postgres

<dependency>
    <groupId>org.postgresql</groupId>
    <artifactId>postgresql</artifactId>
    <version>42.2.18</version>
</dependency>

Example 2: Calling postgres function from spring boot

Author a = em.createQuery("SELECT a FROM Author a WHERE a.id = function('calculate', 1, 2)", Author.class).getSingleResult();