이응기역

https://dbeaver.com/docs/wiki/Connection-Types/

https://velog.io/@qnfmtm666/elasticsearch-Elasticsearch-CRUD-%EA%B8%B0%EB%B3%B8%EC%82%AC%EC%9A%A9%EB%B2%95-feat.-Kibana

IE 에서 안됨 (firefox 등에서 사용)
https://  ...  .elastic.co/login?redirectTo=%2Fhome
Kibana 클릭 (왼쪽메뉴)
Open 클릭 
새창 

(좌측상단) 햄버거 모양 메뉴 클릭
Management 항목에서 dev tools 클릭
왼쪽 창 상단 오른 쪽 끝에 있는 ▷ 클릭하면 실행 됨

https://www.geeksforgeeks.org/curl-command-in-linux-with-examples/?ref=leftbar-rightbar

$ tee --help
Usage: tee [OPTION]... [FILE]...
Copy standard input to each FILE, and also to standard output.

  -a, --append              append to the given FILEs, do not overwrite
  -i, --ignore-interrupts   ignore interrupt signals
  -p                        diagnose errors writing to non pipes
      --output-error[=MODE]   set behavior on write error.  See MODE below
      --help     display this help and exit
      --version  output version information and exit

MODE determines behavior with write errors on the outputs:
  'warn'         diagnose errors writing to any output
  'warn-nopipe'  diagnose errors writing to any output not a pipe
  'exit'         exit on error writing to any output
  'exit-nopipe'  exit on error writing to any output not a pipe
The default MODE for the -p option is 'warn-nopipe'.
The default operation when --output-error is not specified, is to
exit immediately on error writing to a pipe, and diagnose errors
writing to non pipe outputs.

GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
Report any translation bugs to <https://translationproject.org/team/>
Full documentation <https://www.gnu.org/software/coreutils/tee>
or available locally via: info '(coreutils) tee invocation'

$ cat tmp
a
bb
bb
ccc
ccc
ccc

$ uniq -c tmp
      1 a
      2 bb
      3 ccc

C:\jee-2020-092\eclipse>eclipse -clearPersistedState

Entity 쪽 컬럼에 값이 유일해질 수 있도록 컬럼에 @Id 추가

The JPA Id does not always have to match the database table primary key constraint, nor is a primary key or a unique constraint required.

https://en.wikibooks.org/wiki/Java_Persistence/Identity_and_Sequencing#No_Primary_Key

https://docs.spring.io/spring-data/commons/docs/current/api/org/springframework/data/repository/CrudRepository.html

long -> Integer

int -> Integer

https://stackoverflow.com/questions/3154582/why-do-i-get-a-null-value-was-assigned-to-a-property-of-primitive-type-setter-o