[SPRING][MyBatis] batch insert

https://velog.io/@aszxvcb/Bulk-InsertUpdate-%EB%B0%B0%EC%B9%98%EC%9E%91%EC%97%85%EC%97%90%EC%84%9C%EC%9D%98-%EB%8D%B0%EC%9D%B4%ED%84%B0%EC%B2%98%EB%A6%AC-%EB%A6%AC%ED%84%B4%EA%B0%92returnValue

[Bulk Insert/Update] Mybatis 배치작업과 리턴값(returnValue)