文件夹名为 flaskr
文件内容:
import os
from flask import Flask
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, 'flaskr.sqlite'),
)
if test_config is None:
# 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)
except OSError:
pass
# a simple page that says hello
@app.route('/hello')
def hello():
return 'Hello, World!'
from . import db
db.init_app(app)
return app
import sqlite3
import click
from flask import current_app, g
from flask.cli import with_appcontext
def get_db():
if 'db' not in g:
g.db = sqlite3.connect(
current_app.config['DATABASE'],
detect_types=sqlite3.PARSE_DECLTYPES
)
g.db.row_factory = sqlite3.Row
return g.db
def close_db(e=None):
db = g.pop('db', None)
if db is not None:
db.close()
def init_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
def init_db_command():
"""Clear the existing data and create new tables."""
init_db()
click.echo('Initialized the database.')
def init_app(app):
app.teardown_appcontext(close_db)
app.cli.add_command(init_db_command)
DROP TABLE IF EXISTS user;
DROP TABLE IF EXISTS post;
CREATE TABLE user (
id INTEGER PRIMARY KEY AUTOINCREMENT,
username TEXT UNIQUE NOT NULL,
password TEXT NOT NULL
);
CREATE TABLE post (
id INTEGER PRIMARY KEY AUTOINCREMENT,
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)
);
$ cd xxx (你的项目地址)
$ export FLASK_APP=flaskr
$ export FLASK_ENV=development (配置环境)
$ flask init-db
当你运行上面最后一句时终端显示
Usage: flask [OPTIONS] COMMAND [ARGS]…
Error: No such command “init-db”.
这时非常纳闷,我找了半天问题所在原来
如看到上面的报错请检查你的文件目录
返回 flaskr 当前项目的文件上级文件
执行 flask init-db 这个命令
好啦,现在不会在报错了
$ flask run