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Jaeyeop-Jung
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Feb 19, 2023
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관련 이슈 번호
설명
모아보기에서 전체 레코드 개수를 확인할 수 있도록
전체 레코드 수를 반환하는 API 구현하였습니다.
카운트 쿼리를 최소화 하기위해 전체 레코드 수 조회 메서드에서 캐시를 적극 사용하였고,
데이터의 정합성을 위해 글 작성과 글 삭제 시 캐시를 비워주도록 하였습니다.
변경사항
질문사항
jpa 의 count 메서드가 primitive 타입인 long을 반환하도록 바뀐 것 같습니다.
RecordService.java getRecordAllCount 메소드의 반환값을 Wrapper로 설정하고, count쿼리의 결괏값을 boxing하여 return하도록 작성하였더니,
java.lang.ClassCastException가 발생합니다. 이유가 뭘까요...?