flask.py

import _sqlite3

from flask import Flask
from flask import g
from flask import render_template
from flask import request
from flask import Response

app = Flask(__name__)


def get_db():
    db = getattr(g, '_database', None)
    if db is None:
        db = g._database = _sqlite3.connect('test_sqlite.db')
    return db


@app.teardown_appcontext
def close_connection(exception):
    db = getattr(g, '_database', None)
    if db is not None:
        db.close()


@app.route('/employee', methods=['POST', 'PUT', 'DELETE'])
@app.route('/employee/<name>', methods=['GET'])
def employee(name=None):
    db = get_db()
    curs = db.cursor()
    curs.execute(
        'CREATE TABLE if NOT EXISTS persons('
        'id INTEGER PRIMARY KEY AUTOINCREMENT, name STRING)'
    )
    db.commit()

    name = request.values.get('name',name)
    if request.method == 'GET':
        curs.execute('SELECT * FROM persons WHERE name ="{}"'.format(name))
        person = curs.fetchone()
        if not person:
            return "NO", 404
        user_id, name = person
        return '{}:{}'.format(user_id,name), 200

    if request.method == 'POST':
        curs.execute('INSERT INTO persons(name) values("{}")'.format(name))
        db.commit()
        return 'created {}'.format(name), 201

    if request.method == 'PUT':
        new_name = request.values['new_name']
        curs.execute('UPDATE persons set name = "{}" WHERE name = "{}"'.format(new_name, name))
        db.commit()
        return 'updated {}: {}'.format(name, new_name), 200

    if request.method == 'DELETE':
        curs.execute('DELETE from persons WHERE name = "{}"'.format(name))
        db.commit()
        return 'deleted {}'.format(name), 200

    curs.close()

@app.route('/')
def hello_word():
    return 'top'


@app.route('/hello')
@app.route('/hello/<username>')
def hello_word2(username=None):
    #return 'hello world! {}'.format(username)
    return render_template('hello.html', username=username)


@app.route('/post', methods=['POST', 'PUT', 'DELETE'])
def show_post():
    return str(request.values)


def main():
    app.debug = True
    app.run()
    #app.run(host='127.0.0.1', port=5000)


if __name__ == '__main__':
    main()

test_flask.py

import requests

r = requests.get('http://127.0.0.1:5000/employee', data={'username': 'jun'})
print(r.text)

r = requests.post('http://127.0.0.1:5000/employee', data={'username': 'jun'})
print(r.text)

r = requests.put('http://127.0.0.1:5000/employee', data={
    'username': 'jun', 'new_name': 'sakai'})
print(r.text)

r = requests.delete('http://127.0.0.1:5000/employee', data={'username': 'jun'})
print(r.text)

hello.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Hello</title>
</head>
<body>

{% if username %}
Hello {{ username }}
{% else %}
Hello
{% endif %}

</body>
</html>