我试图将现有的sqlite3数据库挂接到我正在构建的仪表板，并且遇到了一个问题，我无法弄清楚如何解决。我一直在尝试将Flask文档和其他资源中的内容拼凑在一起，所以请随时在这里给我打电话，看起来有点奇怪。这可能是的，我只是不知道它:)Flask OperationalError：无法使用sqlite3打开数据库文件
代码：
from __future__ import with_statement
from contextlib import closing
from flask import Flask, render_template, request, session, g, redirect, url_for, abort, flash
import sqlite3
#config
DATABASE = '~/home/aaron/Dropbox/coding/webapp2/tmp/test.db'
DEBUG = True
SECRET_KEY = 'development key'
USERNAME = 'admin'
PASSWORD = 'default'
app = Flask(__name__)
app.config.from_object(__name__)
def connect_db():
return sqlite3.connect(app.config['DATABASE']) # LINE 17
@app.before_request
def before_request():
g.db = connect_db() # LINE 22
@app.teardown_request
def teardown_request(exception):
if hasattr(g, 'db'):
g.db.close()
# App seems to error out before app.route and if __name__=='__main__' block
# Everything in my app.route is commented out
完全错误：
Traceback (most recent call last): File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1701, in call return self.wsgi_app(environ, start_response) File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1689, in wsgi_app response = self.make_response(self.handle_exception(e)) File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1687, in wsgi_app response = self.full_dispatch_request() File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1360, in full_dispatch_request rv = self.handle_user_exception(e) File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1356, in full_dispatch_request rv = self.preprocess_request() File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1539, in preprocess_request rv = func() File "/home/aaron/Dropbox/coding/webapp2/control.py", line 22, in before_request g.db = connect_db() File "/home/aaron/Dropbox/coding/webapp2/control.py", line 17, in connect_db return sqlite3.connect(app.config['DATABASE']) OperationalError: unable to open database file
127.0.0.1 - - [13/Oct/2012 13:55:48] "GET /?debugger=yes&cmd=resource&f=style.css HTTP/1.1" 200 - 127.0.0.1 - - [13/Oct/2012 13:55:48] "GET /?debugger=yes&cmd=resource&f=jquery.js HTTP/1.1" 200 - 127.0.0.1 - - [13/Oct/2012 13:55:48] "GET /?debugger=yes&cmd=resource&f=debugger.js HTTP/1.1" 200 - 127.0.0.1 - - [13/Oct/2012 13:55:48] "GET /?debugger=yes&cmd=resource&f=console.png HTTP/1.1" 200 - 127.0.0.1 - - [13/Oct/2012 13:55:48] "GET /?debugger=yes&cmd=resource&f=source.png HTTP/1.1" 200 - 127.0.0.1 - - [13/Oct/2012 13:55:49] "GET /favicon.ico HTTP/1.1" 500 -
Traceback (most recent call last): File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1701, in call return self.wsgi_app(environ, start_response) File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1689, in wsgi_app response = self.make_response(self.handle_exception(e)) File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1687, in wsgi_app response = self.full_dispatch_request() File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1360, in full_dispatch_request rv = self.handle_user_exception(e) File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1356, in full_dispatch_request rv = self.preprocess_request() File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1539, in preprocess_request rv = func() File "/home/aaron/Dropbox/coding/webapp2/control.py", line 22, in before_request g.db = connect_db() File "/home/aaron/Dropbox/coding/webapp2/control.py", line 17, in connect_db return sqlite3.connect(app.config['DATABASE']) OperationalError: unable to open database file
看来这个问题是从这一配置行来：
DATABASE = '~/home/aaron/Dropbox/coding/webapp2/tmp/test.db'
我的问题：
1）为什么OperationalError被抛出两次？
2）为什么每个OperationalError都会调用第17行和第22行（在上面的代码中注释），尽管这些函数是函数定义而不是函数调用？
3）如果这是一个有效的数据库，并且指定的路径上有数据，我该如何解决错误？
这些是我引用：
http://flask.pocoo.org/docs/tutorial/dbcon/#tutorial-dbcon
http://flask.pocoo.org/docs/tutorial/views/#tutorial-views
http://flask.pocoo.org/docs/patterns/sqlite3/