????????? ???????????? ????? JPA
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SLiPP 1? ???, ??? ????? ?? JPA ?? ?????.
????????? ???????????? ????? JPA
- 1. ??? ????? ?? JPA 2015.12.12 ???(woniper)
- 3. ?? JPA ?? JDBC?? JPA?? ??? ???? ????
- 5. Java ORM(Object-Relational Mapping) ?? F/W RDB? ??? ??(??), ?? Hibernate, Eclipse Link, TopLink Essensials ???
- 6. JDBC?? JPA??
- 8. xBatis <select id="select" parameterType="java.lang.Integer" resultType=＾User￣> select userId, username, password from User where userId = #{userId} </select>
- 9. Query ?? ??? ????
- 10. JPA
- 11. EntityManager em = entityManagerFactory.createEntityManager(); 1. Insert em.persist(user); 2. Select User user = em.find(User.class, 1); 3. Update user.setUsername("update Name"); user.setPassword("1111"); 4. Delete em.remove(user);
- 12. Connection, close Query ?? ?? ? ?? ??? ?? ??
- 13. ???(Entity) ????
- 14. @Entity @Table(name = "User") public class User { @Id @GeneratedValue private Integer userId; @Column(name = "username", nullable = false) private String username; @Column(name = "password", nullable = false) private String password; @Column(name = "nickName", nullable = true) private String nickName; }
- 16. ??? ????
- 17. ??
- 18. ?? ?? SQL(SQL ???) ?? ?? ?? 1? ?? ??? ??? ?? ??
- 19. EntityManagerFactory emf = Persistence.createEntityManagerFactory(＾persistence"); 1? ?? ?? @ID Entity Snapshot SQL ??? EntityManager em1 = emf.createEntityManager(); em1 1? ?? ?? @ID Entity Snapshot SQL ??? EntityManager em2 = emf.createEntityManager(); em2
- 20. 1? ?? ?? @ID Entity Snapshot 1 User User SQL ?? ? ??? ???? J D B C
- 21. ??? ????? ??? ???? ?
- 22. ??(persist)
- 23. EntityManager em = emf.createEntityManager(); em.getTransaction().begin(); // ? ?? ?? User user = new User("wons", "12345", "woniper"); // ?? ?? // 1? ?? ??, Query ?? ? ?? em.persist(user); // ??? ?? // SQL ??? Query DB? ?? em.getTransaction().commit(); em.close();
- 27. ??(find)
- 28. EntityManager em = emf.createEntityManager(); em.getTransaction().begin(); // ?? ??? User user = em.find(User.class, 1); // ??? ?? em.getTransaction().commit(); em.close();
- 32. ??(?? ?? ??)
- 33. EntityManager em = emf.createEntityManager(); em.getTransaction().begin(); // ?? ?? // 1? ?? ?? User user = em.find(User.class, 1); // ?? ?? ?? user.setUserName("updateName"); user.setPassword("1111"); user.setNickName("updateNick"); // ??? ?? em.getTransaction().commit(); em.close();
- 37. ??(remove)
- 38. EntityManager em = emf.createEntityManager(); em.getTransaction().begin(); // ?? ?? // 1? ?? ?? User user = em.find(User.class, 1); // ?? ??, Query ?? ? ?? em.remove(user); // SQL ??? Query DB? ?? em.getTransaction().commit(); em.close();
- 42. ???? ???? ?? commit() ?? ? flush()
- 43. merge
- 44. ? ?? ??? -> ?? ???
- 45. merge? ???? ??
- 46. ?? ??? -> ? ?? ???
- 48. EntityManager em = emf.createEntityManager(); em.getTransaction().begin(); // 1. ?? ??, username == woniper User user1 = em.find(User.class, 1); // 2. ??? ?? em.detach(user1); // 3. username ?? ?? user.setUserName(＾lee-kyung-won"); // 4. ?? ?? em.merge(user1); em.getTransaction().commit(); em.close();
- 49. EntityManager em = emf.createEntityManager(); em.getTransaction().begin(); // 5. username ?? ??? User user2 = em.find(User.class, 1); em.getTransaction().commit(); em.close();
- 54. ??? ??? ??? ??? merge : update ??? ??? merge : insert
- 55. ????
- 59. ?????.
Editor's Notes
- #2: ??
- #3: ??, 3??, ??? ??? ???
- #4: 2?? ?? JDBC,xBatis,JPA ?? JPA?? ?? ??? ??? ????
- #5: ?? ??
- #6: ?? ORM ORM == RDB? ??? ?? ? ?? (?? ??) ?? interface ?? -> ??? Hibernate? ???? ??
- #8: ?? ??? ?? X 3?? ?? ?? X
- #9: JDBC? ?? -> Connection, Close, ?? ??? ??? ?? S??? Map<> ???
- #10: ??? JPA? ?? ?? X ORM? ???? ??? ??? ?? ??(?? X)
- #12: EntityManager ??? ?? ?? update(?? ?? ??)
- #13: Connection, Close, ?? ?? ?? JPA? CRUD? ??? ?? ?? X
- #14: ??? ?? ??? ???? ???? ?? ??? ????
- #15: ??? -> DTO, VO ????? ?? ??? ?? X
- #16: 4?? ??? ?? new ???(???) -> ?? ?? ??? ???? ?? ?? ??? ?? -> ?? ??? (persist) ?? ?? -> remove ??? ?? -> ??? ???(detach) ?? ??? ??? ?? ??
- #17: ??? ??? ???? ??!!!
- #19: ?? ?? X
- #20: EntityManagerFactory persistence ?? -> META-INF/persistence.xml -> ??? ?? X EntityManager ?? -> ??? ???? ?? ?? se, spring?? ?? ???(????)
- #21: ? ??? ???? ?? ??? ? ??? ??? X, EntityManager? ?? JDBC? ??? SQL ???(?? ?? SQL? ??), DB?? ?? ??? ?? 1? ?? ?? @ID == ??? Entity == ??? ??? Snapshot == ?? ???
- #22: CRUD ??? ??
- #24: ????? ?? ?? ?? ?? ??
- #26: 1? ?? ??? ??? ?? ??
- #27: flush? Commit?? ?? ?? ??(??? ??)
- #31: 1? ??? ??? DB?? X
- #32: ?? ? ??
- #34: update ??? X ?? ?? ??
- #35: commit?? ? flush ??(??? ???, ?? ???)
- #36: ??? ?? update ?? ?? ? ??
- #37: ?? ??? ??? DB? ??
- #40: 1? ?? ?? ??
- #41: ?? ?? ? ??
- #42: ?? ??? DB? ??
- #43: ???? ????? ?? flush? ??? ????? DB? ??? commit? ??? DB? ??
- #44: ?? ?? ?? ?? ??? ? ?? ?? ????
- #48: clear : ?? ?? -> ?? ?? ?? ?? detach : ?? ??? ?? close : EntityManager ??
- #49: username == woniper?? ?? ?? ??
- #50: ?? ?? ?? ?? -> username? ???? ?????
- #52: User1 == lee-kyung-won Entity? username == woniper ???? ?? ? ??
- #53: User1? Entity??? ??(?? ???)
- #54: update
- #55: ? ??? update insert? ?? ?? ???? ?? ? 3?? ??
- #56: ?? ??? ??!!!
- #57: ??? ?? ? ???? ??. ???? ??. A/S? ????
- #58: ???
- #59: ???
- #60: ?? ??? ?? ?? ???? ?? ??? ??? ??????!!