Spring Data JPA - Pass column name and value as parameters

Question

I just wanted to know how to pass column name and its value to @Query annotation in Spring Data JPA.

Basically column names will be static and we used to put every c

Answer 1

Take a look at sping data Specifications. You can find your solution there!
Reading the docs you can see that if Calendar is your domain (I would try to find a different name for my domain, there is a Calendar class in Java SE already), then you could use something like the above,

@Repository
public interface CalendarRepository extends JpaRepository, JpaSpecificationExecutor {
}


public class CalendarSpecification implements Specification {

    private String randomColumnName; // A varchar column.
    private String valueToSearchFor;

    public CalendarSpecification(String randomColumnName, String valueToSearchFor) {
        this.randomColumnName = randomColumnName;
        this.valueToSearchFor = valueToSearchFor;
    }

    @Override
    public Predicate toPredicate(Root root, CriteriaQuery query, CriteriaBuilder builder) {
        return builder.and(builder.equal(root.get(this.randomColumnName), this.valueToSearchFor));
    }
}


@Service
public class CalendarService {

    @Autowired
    private CalendarRepository calendarRepository;

    public List findCustom(String randomColumnName, String valueToSearchFor) {
        CalendarSpecification cs = new CalendarSpecification(randomColumnName, valueToSearchFor);
        return calendarRepository.find(cs);
        // Or using lambda expression - without the need of CalendarSpecification class.
//      return calendarRepository.find((Root root, CriteriaQuery query, CriteriaBuilder builder) -> {
//          return builder.and(builder.equal(root.get(randomColumnName), valueToSearchFor));
//      });
    }
}