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Python 2021-11-14 02:21:13
sqlite3 with flask web application CRUD pdf
# app/models.py from flask_login import UserMixin from werkzeug.security import generate_password_hash, check_password_hash from app import db, login_manager class Employee(UserMixin, db.Model): """ Create an Employee table &... Add solution -
Python 2021-11-02 12:22:11
db relationship backref
from sqlalchemy import Integer, ForeignKey, String, Column from sqlalchemy.ext.declarative import declarative_base from sqlalchemy.orm import relationship Base = declarative_base() class User(Base): __tablename__ = 'user' id = Column(Integer, pr... Add solution -
SQL 2021-10-27 03:20:10
load csv files into postgres db sqlalchemy
from numpy import genfromtxt from time import time from datetime import datetime from sqlalchemy import Column, Integer, Float, Date from sqlalchemy.ext.declarative import declarative_base from sqlalchemy import create_engine from sqlalchemy.orm import se... Add solution -
Python 2021-10-27 02:02:14
sqlalchemy one to many
class Parent(Base): __tablename__ = 'parent' id = Column(Integer, primary_key=True) children = relationship("Child", back_populates="parent") class Child(Base): __tablename__ = 'child' id = Column(Integer, primary_... Add solution -
Python 2021-10-12 15:25:09
django select_related and prefetch_related
django select_related and prefetch_related select_related >> foreignkey prefetch_related >> many to many basically they are performance boosters ,used to avoid multiple unnecessary queries Both methods achieve the same purpose, to forego unne... Add solution -
Python 2021-10-11 18:00:15
how to get parent model object based on child model filter in django
#Model class Kid(models.Model): name = models.CharField(max_length=200) class Toy(models.Model): name = models.CharField(max_length=200) owner = models.ForeignKey(Kid) #view Kid.objects.distinct().filter(toy__name__icontains='star') Add solution