flask-sqlalchemy

问题 So I am building a query based on user input in flask with this code: if empty_indic_form.validate_on_submit(): query='select name, year, value, display_name from literal inner join ent on ent_id=ent.id where display_name in (' for i in indic_form.indicators.data: query=query+'\''+i+'\',' query=query[:-1]+') ' query=query+'and name in (' for c in order_c: query=query+c+',' query=query[:-1]+')' data_return=db.engine.execute(query).fetchall() I have confirmed that query looks like what it is

问题 I'm using a framework that does pagination like this: def get_count_query(self): return self.session.query(func.count('*')).select_from(self.model) def paginate(self): ... <irrelevant>... count = self.get_count_query.scalar() ... I want to override the get_count_query method to use my own query because I'm filtering some results and get_count_query just returns all elements in the table. Queries are created dynamically, for example one query could be: Asset.query.join(StatusLabel).filter

问题 From SQLAlchemy docs: nullable – If set to the default of True, indicates the column will be rendered as allowing NULL, else it’s rendered as NOT NULL. This parameter is only used when issuing CREATE TABLE statements. I thought setting nullable=True for a Column basically made that Column required. For example: class Location(db.Model): __tablename__ = 'locations' id = db.Column(db.Integer, primary_key=True) latitude = db.Column(db.String(50), nullable=False) ... However, when I create a

问题 I'm building a web app that uses Flask and SQLAlchemy, but I can't seem to see the reason why this won't import correctly and work. I'm trying to test my database that I'm building, but I keep getting a NameError : File1: from flask.ext.sqlalchemy import SQLAlchemy from flask import Flask from File2 import db, data1, data2, data3 File2: from flask import Flask from flask.ext.sqlalchemy import SQLAlchemy app = Flask(__name__) app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///DB_File.db' #

问题 I'm building a web app that uses Flask and SQLAlchemy, but I can't seem to see the reason why this won't import correctly and work. I'm trying to test my database that I'm building, but I keep getting a NameError : File1: from flask.ext.sqlalchemy import SQLAlchemy from flask import Flask from File2 import db, data1, data2, data3 File2: from flask import Flask from flask.ext.sqlalchemy import SQLAlchemy app = Flask(__name__) app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///DB_File.db' #

问题 Say, we have the following relationships: a person can have many email addresses a email service provider can (obviously) serve multiple email address So, it's a many to many relationship. I have three tables: emails, providers, and users. Emails have two foreign ids for provider and user. Now, given a specific person, I want to print all the email providers and the email address it hosts for this person, if it exists. (If the person do not have an email at Gmail, I still want Gmail be in the

问题 I want to have several app factories(currently: one for development, and another one for testing). I am wondering what is the proper way to implement them. Currently I use app object to register views(via @app.route() decorator). Do I need to start using blueprints(instead of app) to register views? Is there any way to have proper app factories without blueprients? 回答1: technically, you don't need blueprints, you can just register each route on your create_app function. Generally speaking

问题 I'm creating an application to replace current tab managers in the browser. I've created a simple one-to-many relationship between groups - table Topic, and tabs - table Tab. I want to be able to automatically delete topic's children if I delete it. This is what I currently have: from flask import request, redirect, url_for, render_template, Flask from flask_sqlalchemy import SQLAlchemy from sqlalchemy import exc from flask_whooshee import Whooshee from datetime import datetime app = Flask(_

问题 I'm using Flask with its SQLAlchemy extension. I need to define several model classes, which will create tables in MySQL database. The tables will only differ by name, all the field names/datatypes in them will be identical. How do I define the classes for all those tables? I'm thinking of some inheritance, but I'm not quite sure how exactly would I do that. 回答1: Just define all your columns in a mix-in class: from sqlalchemy.ext.declarative import declarative_base Base = declarative_base()

问题 I'm using Flask with its SQLAlchemy extension. I need to define several model classes, which will create tables in MySQL database. The tables will only differ by name, all the field names/datatypes in them will be identical. How do I define the classes for all those tables? I'm thinking of some inheritance, but I'm not quite sure how exactly would I do that. 回答1: Just define all your columns in a mix-in class: from sqlalchemy.ext.declarative import declarative_base Base = declarative_base()