STUDY/Python
[ 생활코딩 - Web2 Python ] Flask Framework - CRUD 구현
JUNGY00N
2022. 12. 14. 01:09
온라인 서비스로 Flask 개발환경 세팅하기
https://glitch.com/edit/#!/resilient-tricky-oak?path=server.py%3A8%3A0 에 접속
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- Remix 버튼 클릭해서 개발환경 복제하기
- 하단 Preview - Open previwq pane 클릭해 웹 화면의 결과 확인 가능
Flask의 라우팅
- 어떤 프레임워크를 사용할지라도 라우팅이 가장 첫번째로 이루어져야하고 가장 중요함
- https://www.geeksforgeeks.org/flask-app-routing/ 참고
- 변수를 URL로 사용하고 싶으면 < > 안에 변수이름을 지정해주고, 그 변수를 함수의 파라미터로 지정해 사용
from flask import Flask
import random
app = Flask(__name__)
@app.route('/')
def index():
return 'Welcome!'
@app.route('/create/')
def create():
return 'Create'
@app.route('/read/<id>')
def read(id):
return 'Read '+id
app.run()읽기 기능 구현 (Read)
from flask import Flask
import random
app = Flask(__name__)
topics = [
{'id': 1, 'title': 'html', 'body': 'html is..'},
{'id': 2, 'title': 'css', 'body': 'css is..'},
{'id': 3, 'title': 'java', 'body': 'java is..'}
]
def template(article, id=None):
liTags =''
for t in topics:
liTags=liTags + f'''<li><a href="/read/{t["id"]}">{t["title"]}</a></li>'''
return f'''<!doctype html>
<html>
<body>
<h1><a href="/">WEB</a></h1>
<ol>
{liTags}
</ol>
{article}
</body>
</html>
'''
@app.route('/')
def index():
article = '''
<h2>Welcome</h2>
Hello World!
'''
return template(article)
@app.route('/read/<id>')
def read(id):
article =''
for t in topics:
if id == str(t["id"]):
article = f'''
<h2>{t["title"]}</h2>
<p>{t["body"]}</p>
'''
return template(article)
@app.route('/create/')
def create():
return 'Create'
app.run()
쓰기 기능 구현 (Create)
from flask import Flask, request, redirect
import random
app = Flask(__name__)
topics = [
{'id': 1, 'title': 'HTML', 'body': 'HTML is..'},
{'id': 2, 'title': 'CSS', 'body': 'CSS is..'},
{'id': 3, 'title': 'JavaScript', 'body': 'JavaScript is..'}
]
def template(article, id=None):
liTags =''
for t in topics:
liTags=liTags + f'''<li><a href="/read/{t["id"]}">{t["title"]}</a></li>'''
context = ''
if id!= None:
context = '''
<ul>
<li><a href="/create/">Create</a></li>
</ul>
'''
return f'''<!doctype html>
<html>
<body>
<h1><a href="/">WEB</a></h1>
<ol>
{liTags}
</ol>
{article}
{context}
</body>
</html>
'''
@app.route('/')
def index():
article = '''
<h2>Welcome</h2>
Hello World!
'''
return template(article)
@app.route('/read/<id>')
def read(id):
article =''
for t in topics:
if id == str(t["id"]):
article = f'''
<h2>{t["title"]}</h2>
<p>{t["body"]}</p>
'''
return template(article,id)
@app.route('/create/', methods=['GET','POST'])
def create():
if request.method == 'GET':
article = '''
<form action="/create/" method="post">
<p><input type="text" name="title" placeholder="title"></p>
<p><textarea name="body" placeholder="body" rows=6></textarea></p>
<p><input type="submit" value="create"></p>
</form>
'''
return template(article)
elif request.method == 'POST':
title = request.form["title"]
body = request.form["body"]
newTopic = {'id':len(topics)+1, 'title':title, 'body':body}
topics.append(newTopic)
url = '/read/'+str(len(topics))
return redirect(url)
app.run()
수정 기능 구현 (Update)
from flask import Flask, request, redirect
import random
app = Flask(__name__)
topics = [
{'id': 1, 'title': 'HTML', 'body': 'HTML is..'},
{'id': 2, 'title': 'CSS', 'body': 'CSS is..'},
{'id': 3, 'title': 'JavaScript', 'body': 'JavaScript is..'}
]
def template(article, id=None):
liTags =''
for t in topics:
liTags=liTags + f'''<li><a href="/read/{t["id"]}">{t["title"]}</a></li>'''
context = ''
if id!= None:
context = f'''
<li><a href="/update/{id}">Update</a></li>
'''
return f'''<!doctype html>
<html>
<body>
<h1><a href="/">WEB</a></h1>
<ol>
{liTags}
</ol>
{article}
<ul>
<li><a href="/create/">Create</a></li>
{context}
</ul>
</body>
</html>
'''
@app.route('/')
def index():
article = '''
<h2>Welcome</h2>
Hello World!
'''
return template(article)
@app.route('/read/<id>')
def read(id):
article =''
for t in topics:
if id == str(t["id"]):
article = f'''
<h2>{t["title"]}</h2>
<p>{t["body"]}</p>
'''
break
return template(article,id)
@app.route('/create/', methods=['GET','POST'])
def create():
if request.method == 'GET':
article = '''
<form action="/create/" method="post">
<p><input type="text" name="title" placeholder="title"></p>
<p><textarea name="body" placeholder="body" rows=6></textarea></p>
<p><input type="submit" value="create"></p>
</form>
'''
return template(article)
elif request.method == 'POST':
title = request.form["title"]
body = request.form["body"]
newTopic = {'id':len(topics)+1, 'title':title, 'body':body}
topics.append(newTopic)
url = '/read/'+str(len(topics))
return redirect(url)
@app.route('/update/<id>', methods=['GET','POST'])
def update(id):
for t in topics:
if id == str(t["id"]):
selectTitle = t["title"]
selectBody = t["body"]
break
if request.method == 'GET':
article = f'''
<form action="/update/{id}" method="post">
<p><input type="text" name="title" value={selectTitle}></p>
<p><textarea name="body" rows=6>{selectBody}</textarea></p>
<p><input type="submit" value="update"></p>
</form>
'''
return template(article)
elif request.method == 'POST':
title = request.form["title"]
body = request.form["body"]
newTopics = []
for t in topics :
if id == str(t["id"]):
t["title"] = title
t["body"] = body
break
url = '/read/'+ id
return redirect(url)
app.run()
삭제 기능 구현 (Delete)
from flask import Flask, request, redirect
import random
app = Flask(__name__)
topics = [
{'id': 1, 'title': 'HTML', 'body': 'HTML is..'},
{'id': 2, 'title': 'CSS', 'body': 'CSS is..'},
{'id': 3, 'title': 'JavaScript', 'body': 'JavaScript is..'}
]
def template(article, id=None):
liTags =''
for t in topics:
liTags=liTags + f'''<li><a href="/read/{t["id"]}">{t["title"]}</a></li>'''
context = ''
if id!= None:
context = f'''
<li><a href="/update/{id}">Update</a></li>
<form action="/delete/{id}" method="post">
<li><input type="submit" value="delete"></li>
</form>
'''
return f'''<!doctype html>
<html>
<body>
<h1><a href="/">WEB</a></h1>
<ol>
{liTags}
</ol>
{article}
<ul>
<li><a href="/create/">Create</a></li>
{context}
</ul>
</body>
</html>
'''
@app.route('/')
def index():
article = '''
<h2>Welcome</h2>
Hello World!
'''
return template(article)
@app.route('/read/<id>')
def read(id):
article =''
for t in topics:
if id == str(t["id"]):
article = f'''
<h2>{t["title"]}</h2>
<p>{t["body"]}</p>
'''
break
return template(article,id)
@app.route('/create/', methods=['GET','POST'])
def create():
if request.method == 'GET':
article = '''
<form action="/create/" method="post">
<p><input type="text" name="title" placeholder="title"></p>
<p><textarea name="body" placeholder="body" rows=6></textarea></p>
<p><input type="submit" value="create"></p>
</form>
'''
return template(article)
elif request.method == 'POST':
title = request.form["title"]
body = request.form["body"]
newTopic = {'id':len(topics)+1, 'title':title, 'body':body}
topics.append(newTopic)
url = '/read/'+str(len(topics))
return redirect(url)
@app.route('/update/<id>', methods=['GET','POST'])
def update(id):
for t in topics:
if id == str(t["id"]):
selectTitle = t["title"]
selectBody = t["body"]
break
if request.method == 'GET':
article = f'''
<form action="/update/{id}" method="post">
<p><input type="text" name="title" value={selectTitle}></p>
<p><textarea name="body" rows=6>{selectBody}</textarea></p>
<p><input type="submit" value="update"></p>
</form>
'''
return template(article)
elif request.method == 'POST':
title = request.form["title"]
body = request.form["body"]
newTopics = []
for t in topics :
if id == str(t["id"]):
t["title"] = title
t["body"] = body
break
url = '/read/'+ id
return redirect(url)
@app.route('/delete/<id>', methods=['POST'])
def delete(id):
for t in topics:
if id == str(t["id"]):
topics.remove(t)
break
return redirect('/')
app.run()