sqlalchemy

问题 I am developing a small registration application for a friend zumba class, using Flask, SQLAlchemy and Flask-migrate(alembic) to deal with db update. I settled on SQlite because the application has to be self contained and runs locally on a laptop without internet access and SQLite requires no installation of a service or other, which is a must too. Dealing with SQLite lack of support of ALTER table wasn't a problem during the initial development as I simply destroyed, recreated the DB when

问题 I'm following the flask-sqlalchemy tutorial on declaring models regarding one-to-many relationship. The example code is as follows: class Person(db.Model): id = db.Column(db.Integer, primary_key=True) name = db.Column(db.String(50)) addresses = db.relationship('Address', backref='person', lazy='dynamic') class Address(db.Model): id = db.Column(db.Integer, primary_key=True) email = db.Column(db.String(50)) person_id = db.Column(db.Integer, db.ForeignKey('person.id')) Now I'm wondering how to

问题 I'm following the flask-sqlalchemy tutorial on declaring models regarding one-to-many relationship. The example code is as follows: class Person(db.Model): id = db.Column(db.Integer, primary_key=True) name = db.Column(db.String(50)) addresses = db.relationship('Address', backref='person', lazy='dynamic') class Address(db.Model): id = db.Column(db.Integer, primary_key=True) email = db.Column(db.String(50)) person_id = db.Column(db.Integer, db.ForeignKey('person.id')) Now I'm wondering how to

问题 I'm following the flask-sqlalchemy tutorial on declaring models regarding one-to-many relationship. The example code is as follows: class Person(db.Model): id = db.Column(db.Integer, primary_key=True) name = db.Column(db.String(50)) addresses = db.relationship('Address', backref='person', lazy='dynamic') class Address(db.Model): id = db.Column(db.Integer, primary_key=True) email = db.Column(db.String(50)) person_id = db.Column(db.Integer, db.ForeignKey('person.id')) Now I'm wondering how to

问题 I wrote raw query to psql and it's work fine but when i wrote this in sqlalchemy my WHERE clause duplicated to FROM clause. select id from T1 where arr && array(select l.id from T1 as l where l.box && box '((0,0),(50,50))'); In this query i fetch all id from T1 where array with ints intersects with results from subquery. class T1(): arr = Column(ARRAY(Integer)) ... class T2(): box = Column(Box) # my geometry type ... 1 verison: layers_q = select([T2.id]).where(T2.box.op('&&')(box)) # try find

问题 I have a query which returns a User object. User s have a number of Post s which they have made. When I perform a query, I want to filter the posts found in User.post based on a specific time. For example, to return only the posts within 1 day of a given timestamp. class User(base): __tablename__ = 'User' class Post(base): __tablename__ = 'Post' user_id = Column(Integer, ForeignKey('User.uid')) user = relationship(User, backref=backref('post') time = Column(DateTime, default=func.current

问题 I am pretty new to python and sqlalchemy and would like to ask for an advice. What would be the best way to force uppercase values in a SqlAlchemy field when the record is inserted/updated? Should I use events for that? Here I am using flask-sqlalchemy version, but I believe it is something similar to SQLAlchemy. from flask.ext.sqlalchemy import SQLAlchemy db = SQLAlchemy() class Item(db.Model): # I need to ensure the code column converts values to uppercase automatically code = db.Column(db

问题 I am pretty new to python and sqlalchemy and would like to ask for an advice. What would be the best way to force uppercase values in a SqlAlchemy field when the record is inserted/updated? Should I use events for that? Here I am using flask-sqlalchemy version, but I believe it is something similar to SQLAlchemy. from flask.ext.sqlalchemy import SQLAlchemy db = SQLAlchemy() class Item(db.Model): # I need to ensure the code column converts values to uppercase automatically code = db.Column(db

问题 I am pretty new to python and sqlalchemy and would like to ask for an advice. What would be the best way to force uppercase values in a SqlAlchemy field when the record is inserted/updated? Should I use events for that? Here I am using flask-sqlalchemy version, but I believe it is something similar to SQLAlchemy. from flask.ext.sqlalchemy import SQLAlchemy db = SQLAlchemy() class Item(db.Model): # I need to ensure the code column converts values to uppercase automatically code = db.Column(db

问题 I am pretty new to python and sqlalchemy and would like to ask for an advice. What would be the best way to force uppercase values in a SqlAlchemy field when the record is inserted/updated? Should I use events for that? Here I am using flask-sqlalchemy version, but I believe it is something similar to SQLAlchemy. from flask.ext.sqlalchemy import SQLAlchemy db = SQLAlchemy() class Item(db.Model): # I need to ensure the code column converts values to uppercase automatically code = db.Column(db