即使在安装flask-sqlachemy之后,我也无法导入flask_sqlalchemy
from flask import Flask, render_template
from flask_sqlalchemy import SQLAlchemy
# ^this line shows error ImportError: "flask_sqlalchemy" could not be resolved
app = Flask(__name__)
@app.route('/')
def index():
return render_templa
假设我想使用for循环更改数据库中一组项的属性。(使用flask + SQLAlchemy) Python
我是不是应该在整个循环结束后再提交:
for item in items:
do stuff
db.session.commit()
还是在每次迭代之后?
for item in items:
do stuff
db.session.commit()
我的应用程序中有一个app_db模块
import os
from flask import Flask
from flask.ext.sqlalchemy import SQLAlchemy
from flask.ext.script import Manager
from flask.ext.migrate import Migrate, MigrateCommand
from app.models.models import *
if os.environ.get('DATABASE_URL') is None:
SQLALCHEMY_DATA
我有一个包含股票市场报价的MySQL数据库。我正在尝试创建一个python脚本来连接到数据库并查询它。这是我的python脚本..。
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql://root:password@localhost:8889/database_name'
db = SQLAlchemy(app)
class Stocks(d
我正试着在部署Flask应用程序时四处游玩。当我在亚马逊的EC2上使用docker群运行代码时,我开始得到以下错误:
错误消息:
sqlalchemy.exc:OperationalError: (psycopg2.OperationalError) server closed the connection unexpectedly This probably means the server terminated abnormally before or while processing the request.[SQL: SELECT visitor."ID" AS
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "C:\Users\Anirudh\Documents\flask_app\connecting_to_database\application.py", line 2, in <module>
from flask_sqlalchemy import SQLAlchemy
File "C:\Users\Anirudh\AppData\Local\P
我收到一个错误:
MacBook-Pro:microblog_3 olehdubno$ python db_create.py
Traceback (most recent call last):
File "db_create.py", line 5, in <module>
from app import db
File "/Users/olehdubno/Desktop/microblog_3/app/__init__.py", line 2, in <module>
from flask.ext.sqla
我正在尝试理解棉花糖模式的自省是如何工作的。下面是一个简单的代码示例: import os
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_marshmallow import Marshmallow
from pprint import pprint
db_file = "database.db"
if os.path.isfile(db_file):
os.remove(db_file)
app = Flask(__name__)
app.config[&
我在Heroku上运行应用程序时遇到了一个问题。本地版本似乎工作得很好,但我无法在heroku平台上调用create_db()。
这是错误跟踪。
(venv)S-MBP:LaunchPage3 S$ heroku run python
Running python on herokuapp... up, run.5609
Python 2.7.11 (default, Dec 7 2015, 21:16:24)
[GCC 4.8.4] on linux2
Type "help", "copyright", "credits" or "
我试图同时提交和查询DB中的结果,结果出现了这个错误。
sqlalchemy.exc.InvalidRequestError: This session is in 'committed' state; no further SQL can be emitted within this transaction.
完整回溯:
Traceback (most recent call last):
File "C:\Python34\lib\site-packages\flask\app.py", line 1836, in __call__
return
从文档中看,一切看起来都很好,但在运行该应用程序时,它仍然给了我这个错误:
File "main.py", line 21, in <module>
class UserSchema(ma.ModelSchema):
AttributeError: 'Marshmallow' object has no attribute 'ModelSchema'
所有东西都是正确导入的。数据库已提交。皮潘夫和文夫的行为是一样的。
我是不是遗漏了什么?
from flask import Flask, jsonify
from flas
我是新的瓶,有一些问题,建立一个非常基本的烧瓶应用程序。现在,我正试图让用户在主页上提交一个表单,然后将该表单保存到SQL数据库中。
但是,当用户提交表单时,我会得到以下错误
sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) no such table: contact [SQL: 'INSERT INTO contact (name, email) VALUES (?, ?)'] [parameters: ('aaa', 'aaa')] (Background on this
我正在使用Python和Javascript进行in 50的网络编程,在Lecture4中,我尝试创建postgresql数据库表时出错了:
Traceback (most recent call last):
File "create.py", line 19, in <module>
main()
File "create.py", line 15, in main
db.create_all()
File "/Library/Frameworks/Python.framework/Versions/3.7/