How can I return date and count of records for that date using spring data jpa?

Question

I want to return event count by date.Below is my code

@Query(value = "select DATE(e.startTime) as day,count(distinct e.id) as eventCount from events e " +
            "where e.clientId=:clientId and e.startTime>=:firstDay and e.startTime<=:lastDay group by DATE(e.startTime)",nativeQuery = true)
    Map<Integer, Integer> getClientEventsCountByDay(@Param(value = "clientId") Integer clientId,
                                                    @Param(value = "firstDay") String firstDay,
                                                    @Param(value = "lastDay") String lastDay);

Input is clientId=2510,firstDay=2019-01-01,lastDay=2019-01-31

This query is throwing below error

Caused by: org.springframework.dao.IncorrectResultSizeDataAccessException: result returns more than one elements; nested exception is javax.persistence.NonUniqueResultException: result returns more than one elements

However this query is working fine when running directly on db.

Answer 1

Try changing to this

List<Map<Integer, Integer>> getClientEventsCountByDay(@Param(value = "clientId") Integer clientId,
                                                @Param(value = "firstDay") String firstDay,
                                                @Param(value = "lastDay") String lastDay);