如果我 select 超过 1 列，@Query 将不起作用

Question

I have a query like below that doesn't work.
It throws IndexOutOfBoundsException: Index: 0, Size: 0
(sorry I can't post the whole stacktrace as it is in my workstation (remote)) This started to be an issue when I upgraded from Spring Boot 1.5.2.RELEASE to 1.5.22.RELEASE

@Transactional(readOnly = true)
@Query(value = "SELECT q.id as someId, q.name as someName from Quote q where q.id in (:quoteIds)")
List<Tuple> selectSomeThings(@Param("quoteIds") List<Long> quoteIds)

Now when I try to just select 1 column like so,

@Transactional(readOnly = true)
@Query(value = "SELECT q.id as someId from Quote q where q.id in (:quoteIds)")
List<Tuple> selectSomeThings(@Param("quoteIds") List<Long> quoteIds)

or

@Transactional(readOnly = true)
@Query(value = "SELECT q.name as someName from Quote q where q.id in (:quoteIds)")
List<Tuple> selectSomeThings(@Param("quoteIds") List<Long> quoteIds)

it works. Just doesn't work when I select 2 at the same time.

Answer 1

I would recommend to return a Bean instance from the repository methode.

Example here:

    @Query("SELECT " +
           "    new com.path.to.Tuple(v.id, v.name) " +
           "FROM " +
           "    Quote v where v.id in (:quoteIds) ")
    List<Tuple> find(@Param("quoteIds") List<Long> quoteIds);