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21/10/02(토) JPA 스터디 자료입니다. Covenant: https://github.com/KoEonYack <><
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왜 개발자는 컴퓨터공학을 공부해야 할까? (비전공자는 컴퓨터공학 과목에서 무엇을 알아야할까?)
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JPA Week5. Join Fetch
1.
JPA Covenant Chapter 5 JPA JPQL Join
Fetch
2.
- Name. Covenant
Ko - Company. 11번가 - Github 용감한친구들 Organization Founder & Maintainer. https://github.com/brave-people - Github. https://github.com/KoEonYack - Tech Blog. https://covenant.tistory.com/ (누적 방문 51만)
3.
(Cartesian Product) JPQL Fetch
Join ? https://www.mathstopia.net/sets/cartesian-product A×B = { (a,b) | aϵA and bϵB } Cartesian Product is the multiplication of two sets to form the set of all ordered pairs.
4.
(Cartesian Product) JPQL Fetch
Join ?
5.
1 1 1 * 1 *
6.
1 1 1 * 1 *
7.
1 1 1 * 1 *
8.
1 1 1 * 1 * Order Member
Delivery
9.
1 1 1 * 1 * Order Member
Delivery ?
10.
1 1 1 * 1 * Order Member
Delivery ? .
11.
1 * 1 1 1 * * 1
12.
1 * 1 1 1 * * 1 DB
Order 2 OrderItem 2 ? OrderA OrderA OrderB OrderB OrderItemA OrderItemB OrderItemA OrderItemB
13.
Distinct 1. SQL distinct
row . 2. JPQL distinct Root Entity
14.
Distinct 1. SQL distinct
row . 2. JPQL distinct Root Entity ? No
15.
Distinct 1. SQL distinct
row . 2. JPQL distinct Root Entity ?
16.
Distinct 1. SQL distinct
row . 2. JPQL distinct Root Entity ? No
17.
Distinct 1. SQL distinct
row . 2. JPQL distinct Root Entity ? No
18.
? https://velog.io/@neity16/
19.
? https://velog.io/@neity16/ DB JPQL DISTINCT
20.
1. ToOne(OneToOne, ManyToOne) 2. 3.
hibernate default_batch_fetch_size or @BatchSize
21.
JPA Covenant Chapter 5 JPA JPQL Join
Fetch
Download now