Today I Learned

I constantly learn new things. This is a repo to share those learnings.

Computer Science

• Network
  • 패킷
  • 웹소켓
  • Race Condition
  • 세마포어(Semaphore) & 뮤텍스(Mutex)

SQL

• NVL & NVL2
• include refid
• selectKey
• SELECT INTO

Java

• 싱글턴(SingleTon) 패턴
• @Transactional
• Checked Exception과 Unchecked Exception
• event:init
• iterator
• Static
• try-with-resource
• Enum Type
• JVM
• Bind Variable(바인드변수)
• if-else, switch
• Promise, Deferred
• String, StringBuilder, StringBuffer

DB

• index
• 트랜잭션(Transaction)

Node.js

• server.js (Express로 웹서버 실행하기)

ECT

• calc()
• getRowData
• setCookie(id, value, expires)
• 서버 재실행 없이 XML적용하기
• jsonArray