https://pieterjd.github.io/tags/spring-data/Recent content in Spring Data on pieterjd.beHugo -- gohugo.ioen-usThis work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.Tue, 11 Jun 2019 19:16:00 +0000https://pieterjd.github.io/posts/2019-06-11-jpa-check-if-row-exists-with-property-value/Tue, 11 Jun 2019 19:16:00 +0000https://pieterjd.github.io/posts/2019-06-11-jpa-check-if-row-exists-with-property-value/Spring Data has a great declarative way of defining queries, called derived queries. Suppose you have a Person class with an email field. Then you can define the following method in a Repository interface: public interface PersonRepository extends JpaRepository<Person,Long>{ List<Person> findByEmail(String email); } Spring derives the query based on the method name, in this case a query to retrieve all persons with a given value for the email field. As you can see, the method returns a List.