flask-sqlalchemy

问题 I am connected to a MS SQL Server. The following returns all the table names in the database: app.config.from_object('config') db = SQLAlchemy(app) db.engine.table_names() However, this doesn't: db.metadata.tables.keys() // returns: dict_keys([]) Similarly, this doesn't work: db.table('dbo.users').primary_key // returns: ColumnSet([]) However, I am able to execute SQL queries. What would be the problem? 回答1: Engine.table_names gives you a list of available table names from the database.

问题 I'm trying to render image on my website but it's doesn't work (i see only corrupted file icon). Could You please tell me what i'm doing wrong ? The way how I upload the image: @app.route('/UploadImages') def UploadImages(): return render_template('UploadImages.html') @app.route('/uploadImages', methods=['POST']) def uploadImages(): name = current_user.USERNAME file = request.files['inputFile'] newFile=IMAGES( NAME=file.filename, USERNAME=name, DATA=file.read() ) db.session.add(newFile) db

问题 I'm trying to render image on my website but it's doesn't work (i see only corrupted file icon). Could You please tell me what i'm doing wrong ? The way how I upload the image: @app.route('/UploadImages') def UploadImages(): return render_template('UploadImages.html') @app.route('/uploadImages', methods=['POST']) def uploadImages(): name = current_user.USERNAME file = request.files['inputFile'] newFile=IMAGES( NAME=file.filename, USERNAME=name, DATA=file.read() ) db.session.add(newFile) db

问题 My tests take a long time to run and I am trying to rollback transactions between tests instead of dropping and creating the tables between tests. The issues is that in some tests I do multiple commits. EDIT: How do I rollback transactions between tests so that tests will run faster Here is the Base class used for testing. import unittest from app import create_app from app.core import db from test_client import TestClient, TestResponse class TestBase(unittest.TestCase): def setUp(self): self

问题 In the event mapper level docs it says that Session.add() is not supported, but when I tried to do db.session.add(some_object) inside after_insert event it worked, example: def after_insert_listener(mapper, connection, user): global_group = Group.query.filter_by(groupname='global').first() a = Association(user,global_group) db.session.add(a) event.listen(User, 'after_insert', after_insert_listener) Basically any new user should be part of global_group, so I added it in the after_insert event.

问题 In the event mapper level docs it says that Session.add() is not supported, but when I tried to do db.session.add(some_object) inside after_insert event it worked, example: def after_insert_listener(mapper, connection, user): global_group = Group.query.filter_by(groupname='global').first() a = Association(user,global_group) db.session.add(a) event.listen(User, 'after_insert', after_insert_listener) Basically any new user should be part of global_group, so I added it in the after_insert event.

问题 I have a Flask project that interacts with MySQL db through Flask-SQLAlchemy . My question is, how to select a row from the database based on a value OR another value. The results I want in SQL looks like this SELECT id FROM users WHERE email=email OR name=name; How to achieve that in Flask-SQLAlchemy ? 回答1: The following may help: # app.py from flask import Flask from flask_sqlalchemy import SQLAlchemy app = Flask(__name__) app.config['SQLALCHEMY_DATABASE_URI'] = 'url_or_path/to/database' db

问题 I have a Flask project that interacts with MySQL db through Flask-SQLAlchemy . My question is, how to select a row from the database based on a value OR another value. The results I want in SQL looks like this SELECT id FROM users WHERE email=email OR name=name; How to achieve that in Flask-SQLAlchemy ? 回答1: The following may help: # app.py from flask import Flask from flask_sqlalchemy import SQLAlchemy app = Flask(__name__) app.config['SQLALCHEMY_DATABASE_URI'] = 'url_or_path/to/database' db

问题 Here is my models: from flask import Flask from flask_sqlalchemy import SQLAlchemy app = Flask(__name__) db = SQLAlchemy(app) class Person(db.Model): __tablename__ = 'persons' id = db.Column(db.Integer, primary_key=True) name = db.Column(db.String(64), nullable=False, unique=True) pets = db.relationship('Pet', backref='owner', lazy='dynamic') def __init__(self, *args, **kwargs): super(Person, self).__init__(*args, **kwargs) def __repr__(self): return f'<Person id:{self.id} name:{self.name}>'

问题 I don't think I fully understand association tables. I know how to work with normal tables i.e add rows and what not but I don't understand how to work with an association table. why would I use the below student_identifier = db.Table('student_identifier', db.Column('class_id', db.Integer, db.ForeignKey('classes.class_id')), db.Column('user_id', db.Integer, db.ForeignKey('students.user_id')) ) Vs class studentIdent(db.model): db.Column(db.Integer, db.ForeignKey('classes.class_id')), db.Column