flask接口入门实现简单的登录注册（一）

importos

from flask importFlask


def create_app(test_config=None):
    #create and configure the app
    app = Flask(__name__, instance_relative_config=True)
    app.config.from_mapping(
        SECRET_KEY='dev',
        DATABASE=os.path.join(app.instance_path, 'app.sqlite'),
    )

    if test_config isNone:
        #load the instance config, if it exists, when not testing
        app.config.from_pyfile('config.py', silent=True)
    else:
        #load the test config if passed in
app.config.from_mapping(test_config)

    #ensure the instance folder exists
    try:
        os.makedirs(app.instance_path)
    exceptOSError:
        pass

    #a simple page that says hello
    @app.route('/hello')
    defhello():
        return 'Hello, World!'

    from . importdb
    db.init_app(app)

from . import auth
app.register_blueprint(auth.bp)

return app

importsqlite3
importclick
from flask importcurrent_app, g
from flask.cli importwith_appcontext


defget_db():
    if 'db' not ing:
        g.db =sqlite3.connect(
            current_app.config['DATABASE'],
            detect_types=sqlite3.PARSE_DECLTYPES
        )
        g.db.row_factory =sqlite3.Row

    returng.db


def close_db(e=None):
    db = g.pop('db', None)

    if db is notNone:
        db.close()


definit_db():
    db =get_db()

    with current_app.open_resource('schema.sql') as f:
        db.executescript(f.read().decode('utf8'))


@click.command('init-db')
@with_appcontext
definit_db_command():
    """Clear the existing data and create new tables."""init_db()
    click.echo('Initialized the database.')


definit_app(app):
    app.teardown_appcontext(close_db)
    app.cli.add_command(init_db_command)

DROP TABLE IF EXISTS user;
DROP TABLE IF EXISTSpost;

CREATE TABLE user(
  id INTEGER PRIMARY KEYAUTOINCREMENT,
  username TEXT UNIQUE NOT NULL,
  password TEXT NOT NULL);

CREATE TABLEpost (
  id INTEGER PRIMARY KEYAUTOINCREMENT,
  author_id INTEGER NOT NULL,
  created TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  title TEXT NOT NULL,
  body TEXT NOT NULL,
  FOREIGN KEY (author_id) REFERENCES user(id)
);