How to return a count column not exists in table by JPA - jpa

Question

I want find a way to get extra column that count my records and return it in 1 mapping entity with extra filed.
I tried #transient on field but it will not return value when query.
Then I remove #transient but get an exception when save.
Also I tried #Formula but received null pointer exception.
Here's my repository code:
#Query(value = "select id,account,session_id,create_time,count from query_history a join " +
"(select session_id sessionId,max(create_time) createTime,count(*) count from query_history group by session_id) b " +
"on a.session_id = b.sessionId and a.create_time = b.createTime where account = ?1 order by create_time desc",
countQuery = "select count(distinct(session_id)) from query_history where account = ?1",
nativeQuery = true)
Page<QueryHistory> findByNtAndGroupBySessionAndAction(String account, Pageable pageable);
entity code:
#Entity
#Table(name = "query_history")
#Data
public class QueryHistory {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#Column
private String account;
#Column
private Long sessionId;
#Column
private long createTime;
#Transient
private Integer count;
}
Sorry about my English and thanks a lot for any advice.

Answer 1

I solved the problem by projections spring-data-projections, in fact I tried this before but in my sql:
select id,account,session_id,create_time,count
which should be:
select id,account,session_id sessionId,create_time createTime,count
PS:
projection interface:
public interface QueryHistoryWithCountProjection {
Long getId();
String getAccount();
Long getSessionId();
long getCreateTime();
Integer getCount();
}