# -*- coding: utf-8 -*-
"""
資料操作、查詢、過濾器、非過濾器方法
"""



from random import randint

from django.shortcuts import render
from django.http import HttpResponse
from .models import User

# Create your views here.
def handle_data(request):
#增加記錄
    # user = User(username='Jack1',password='111222')
    # user.save()

    # 批量建立
    # firstname = "張李趙周王鄭"
    # lastname = ["麗莉","德克","好","兒","童費","紅英","豆蔻"]
    # users = []
    # for name in range(10):
    #     user = firstname[randint(0,5)] + lastname[randint(0,6)] + str(randint(0,999))
    #     users.append(User(username=user,password=str(randint(111111,999999))))
    # User.objects.bulk_create(users)
    # # User.objects.bulk_create([User(username='test1',password='123456'),User(username='test2')])
    # return HttpResponse("增加資料")

#修改記錄
    user = User.objects.get(pk=1)
    user.password = '333'
    user.save()
    return HttpResponse("資料修改")


# 刪除記錄
#     try:
#         user = User.objects.get(pk=1)  #pk表示主鍵
#         print(user,type(user))
#         if user:
#             user.delete()
#     except Exception as e:
#         print(e)
#     return HttpResponse("資料刪除")


def search_data(request):
    #過濾器1 ： all   查詢所有
    # users =  User.objects.all()
    # return render(request, "user_list.html", locals())


    #過濾器2 ：filter
    # filter 相當於SQL中的 Where，可設定條件過濾結果
    # users = User.objects.filter(uid__gt=150).filter(uid__lt=160)   # __gt= : 大於  __lt= :小於
    # return render(request, "user_list.html", locals())

    #過濾器： order_by()   升序排序
    # users = User.objects.filter(uid__gt=150).filter(uid__lt=160).order_by('username')
    # return render(request, "user_list.html", locals())

    #限制結果集
    # users = User.objects.filter(uid__gt=150).filter(uid__lt=160).order_by('username')[:2]   # 顯示前兩條資料
    # return render(request, "user_list.html", locals())


    #顯示指定欄位
    # users = User.objects.values('username')
    # return render(request, "user_list.html", locals())


    #去重
    users = User.objects.all().values('username').distinct()[:10]
    return render(request, "user_list.html", locals())


# 非過濾方法
def process_query(request):
    # # 1、get 只能返回一條資料,存在多條滿足篩選條件時，報錯
    # user = User.objects.get(uid__gt= 173)
    # print(user.username)
    # return HttpResponse(f"get查詢結果是：{user.username}")

    # # 2、first 返回一個模型物件
    # user = User.objects.first()
    # print(user.username)
    # return HttpResponse(f"first查詢結果是：{user.username}")

    # # 3、last 返回一個模型物件,查詢最後一條資料
    # user = User.objects.last()
    # print(user.username)
    # return HttpResponse(f"last查詢結果是：{user.username}")

    # # 4、count 顯示結果集的數量總數,必須是QuerySet才能呼叫
    # num = User.objects.filter(uid__gt=100).count()
    # print(num)
    # return HttpResponse(f"count查詢結果是：{num}")


    # 5、exists  判斷結果集是否為空
    flag = User.objects.filter(uid__gt=100).exists()
    print(flag)
    return HttpResponse(f"exists查詢結果是：{flag}")