JPA

1.save(), saveAll(), saveAndFlush()

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2.QueryDSL

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3.JPA (Java Persistence API)

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4.JpaRepository

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5.JPA, Spring Data JPA, Hibernate

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6.영속성 컨텍스트 (persistence context)

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7.순환 참조 (Circular Reference)

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8.JPA 를 사용한 수정에서 save 메서드는 없어도 된다

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