Django 惰性机制

# 在最后添加
LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'handlers': {
        'console':{
            'level':'DEBUG',
            'class':'logging.StreamHandler',
        },
    },
    'loggers': {
        'django.db.backends': {
            'handlers': ['console'],
            'propagate': True,
            'level':'DEBUG',
        },
    }
}

from django.shortcuts import render, HttpResponse
from app01 import models
from  app01.models import Book,Author,Publisher

# Create your views here.

def data_oper(req):

    obj_set = models.Book.objects.filter(id=2)

    return HttpResponse("Hello world")

rom django.shortcuts import render, HttpResponse
from app01 import models
from  app01.models import Book,Author,Publisher

# Create your views here.

def data_oper(req):

    obj_set = models.Book.objects.filter(id=2)
    for obj in obj_set:
        print(obj.title)

    return HttpResponse("Hello world")