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[英]Connecting to sqlite3 database from Flask application and printing data on a webpage
[英]Cannot create sqlite3 database in flask application?
我有以下脚本:
#!flask/bin/python
import os
from flask import Flask, render_template, request, url_for
from flask.ext.sqlalchemy import SQLAlchemy
app = Flask("hello")
basedir = os.path.abspath(os.path.dirname(__file__))
SQLALCHEMY_DATABASE_URI = 'sqlite:///' + os.path.join(basedir, 'app.sqlite3')
print SQLALCHEMY_DATABASE_URI
db = SQLAlchemy(app)
db.create_all()
print db
但是当我实际运行脚本时,什么也没看到:
$ python db_create.py
sqlite:////home/ubuntu/Paw/paw/app.sqlite3
/home/ubuntu/.virtualenvs/paw-py/local/lib/python2.7/site-packages/flask_sqlalchemy/__init__.py:800: UserWarning: SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in the future. Set it to True to suppress this warning.
warnings.warn('SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in the future. Set it to True to suppress this warning.')
<SQLAlchemy engine='sqlite://'>
那么,为什么我看到SQLAlchemy引擎被放置在内存中?
我的权限似乎也没有错。
您所要做的就是创建一个名为SQLALCHEMY_DATABASE_URI的变量。 您没有做任何事情告诉SQLAlchemy使用该值。
如文档所示,您需要将其传递给app.config
:
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///' + os.path.join(basedir, 'app.sqlite3')
db = SQLAlchemy(app)
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