["slug" being an entity attribute]
Spring Data offers an existsBy query method, which we can define in the PostRepository, as follows:
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@Repository
public interface PostRepository
extends JpaRepository<Post, Long> {
boolean existsBySlug(String slug);
}
[another] option to emulate existence is using a CASE WHEN EXISTS native SQL query:
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@Repository
public interface PostRepository
extends JpaRepository<Post, Long> {
@Query(value = """
SELECT
CASE WHEN EXISTS (
SELECT 1
FROM post
WHERE slug = :slug
)
THEN 'true'
ELSE 'false'
END
""",
nativeQuery = true
)
boolean existsBySlugWithCase(@Param("slug") String slug);
}
Hawaiian Airlines Flight Check-in" is a simple and convenient process that allows passengers to prepare for their upcoming journey with ease. During this procedure, travelers can confirm their flight reservations, select their preferred seats, and obtain their boarding passes, all while ensuring a smooth and stress-free start to their Hawaiian Airlines adventure.
A. Islam, M. Islam, M. Alam, and S. Ullah. International Journal of Computer Science, Engineering and Information Technology (IJCSEIT), 1 (4):
01-13(October 2011)