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["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);
}
@Repository
public interface PostRepository extends BaseJpaRepository<Post, Long> {
@Query("""
select p
from Post p
where date(p.createdOn) >= :sinceDate
"""
)
@QueryHints(
@QueryHint(name = AvailableHints.HINT_FETCH_SIZE, value = "25")
)
Stream<Post> streamByCreatedOnSince(@Param("sinceDate") LocalDate sinceDate);
}
The FETCH_SIZE JPA query hint is necessary for PostgreSQL and MySQL to instruct the JDBC Driver to prefetch at most 25 records. Otherwise, the PostgreSQL and MySQL JDBC Drivers would prefetch all the query results prior to traversing the underlying ResultSet.
If you upgrade your spring-boot version to >= 2.3.0 you can enable the liveness and readiness probes by adding:
management:
health:
probes:
enabled: true
You need to manually import the ServerHttpSecurity invoke.
import org.springframework.security.config.web.server.invoke
/
import org.springframework.security.config.annotation.web.invoke
Social enterprise and social impact bonds are evolving concepts to describe new ways applying market models and solutions to social problems along with new ways of financing these projects. Contracting for outcomes, while well-understood in business-based contracts is still fairly new in the application to social programs. These are distinct but related approaches that are being touted as a way for government contract for public services and reduce expenditures on social programs.
Spring Social is an extension of the Spring Framework to enable the development of social-ready applications. With Spring Social you can create applications that interact with various social networking sites such as Twitter, Facebook, LinkedIn, and TripIt, giving the users of your application a more personal experience.
The main features of Spring Social include:
* A set of social network templates for interacting with Twitter, Facebook, LinkedIn, TripIt, and Greenhouse.
* An OAuth-aware request factory for signing RestTemplate requests with OAuth authorization details.
* A web argument resolver for extracting Facebook user ID and access token information in a Spring MVC controller.