December 2017
Beginner
624 pages
15h 38m
Korean
Content preview from Head First Python, 개정판 : 스스로 질문하며 답을 찾는 파이썬 학습서(Python 3)
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334 Chapter 7
db
-
api 더 파헤치기
DB-API 자세히 보기, 3/3
insert
질의문으로 샘플 데이터를
log
테이블에 삽입합시다.
아래 여러 행에 걸쳐 만든 쿼리를 _
SQL
변수로 할당한 다음
cursor
.
execute
로 실행하고 싶을 거예요.
>>> _SQL = """insert into log
(phrase, letters, ip, browser_string, results)
values
('hitch-hiker', 'aeiou', '127.0.0.1', 'Firefox', "{'e', 'i'}")"""
>>> cursor.execute(_SQL)
위 코드는 물론 작동합니다. 하지만 매번
insert
문을 실행할 때마다 테이블에 저장하는 값이 달라지므로 위 코드처럼
삽입하려는 데이터 값을 하드코딩하는 것은 좋지 않습니다. 기억하세요. 우리 계획은 각 웹 요청을
log
테이블에 기록하는
겁니다. 즉, 매번
insert
를 실행할 때마다 값이 달라진다는 거죠. 데이터 값이 하드코딩되어 있다면 재앙이 일어납니다.
위처럼 데이터를 하드코딩하지 않도록 파이썬의
DB
-
API
는 질의 문자열에
‘
데이터 플레이스홀더
’
를 사용할 수 있도록
허용합니다. 데이터 플레이스홀더는
cursor
.
execute
를 호출할 때 실제 값으로 채워집 ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.