T.I.L_230206

What’s New for Today

1. Algorithm
   • 1205
     • implementation
     • sort
   • 2304
     • implementation
2. JPA
   • recap
     • jpa dto queries
       • simple dto query
         • O(1+n)
       • toOne + toMany optimization
         • O(1+1)
       • flat query
         • O(1)
   • osiv
     • commmand and query seperation
       • ex:
         • OrderSerivce: 비즈니스 로직 처리
         • OrderQueryService: 화면 처리 서비스
     • osiv vs performance