querydsl

Spring Data JPA and Querydsl to fetch subset of columns using bean/constructor projection

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Looks like custom repository implementation is the way to go for now until something similar available in spring data. I have gone through http://static.springsource.org/spring-data/data-jpa/docs/current/reference/html/repositories.html#repositories.custom-implementations Here is my implementation which works. However it would be good to have this method available directly in Spring-Data-JPA Step 1: Intermediate interface for shared behavior public interface CustomQueryDslJpaRepository <T, ID … Read more

Spring Boot & JPA: Implementing search queries with optional, ranged criteria

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You can achieve complex queries with specifications by JpaSpecificationExecutor in spring data. Repository interface must extend the JpaSpecificationExecutor<T> interface so we can specify the conditions of our database queries by creating new Specification<T> objects. The trick is in the use of the Specification interface in combination with a JpaSpecificationExecutor. here is the example: @Entity @Table(name … Read more

Dynamic spring data jpa repository query with arbitrary AND clauses

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You can use Specifications that Spring-data gives you out of the box. and be able to use criteria API to build queries programmatically.To support specifications you can extend your repository interface with the JpaSpecificationExecutor interface public interface CustomerRepository extends SimpleJpaRepository<T, ID>, JpaSpecificationExecutor { } The additional interface(JpaSpecificationExecutor ) carries methods that allow you to execute … Read more

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