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並前往https://books.google.com.tw/books?id=t-ZDDwAAQBAJ&pg=PA69&lpg=PA69&dq=entitymanager+merge&source=bl&ots=ROBj-cKQNK&sig=ACfU3U3UjsSGzT_-ha29HHapHqTmasscuA&hl=zh-TW&sa=X&ved=2ahUKEwin6_m8q432AhX-S2wGHSDCADoQ6AF6BQi9AhAD

Java 9 Programming Blueprints - 第 69 頁 - Google 圖書結果

Since we retrieved it via JPA, when we make any changes to its state, JPA knows ... to call entityManager. merge(), after which this behavior will resume.

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