57.Django框架之序列化输出

Django框架

【一】序列化组件

1）使用案例

在前端获取到后端用户表里面的所有数据，并且格式是列表套字典

# 创建模型表
class User(models.Model):
	username = models.CharField(max_length=32, verbose_name="姓名")
    age = models.IntegerField(verbose_name="年龄")

2）基于JsonResponse序列化数据

# 后端
def ab_ser(request):
    user_queryset = models.User.objects.all()
    # 返回数据格式：[{},{},,{},{},{},{}]
    user_list = []
    for user in user_queryset:
        tmp = {
            'username': user.username,
            'password': user.age,
            'gender': user.get_gender_display(),
        }
        user_list.append(tmp)
    return JsonResponse(user_list, safe=False)
    # return render(request, 'ab_ser.html', locals())

# 前端
<body>
{% for user_obj in user_queryset %}
    <p>{{ user_obj.name }}</p>
{% endfor %}
</body>

# 数据展示
[
{"username": "dream", "password": 18, "gender": "male"}, 
{"username": "meng", "password": 28, "gender": "female"}, 
{"username": "hope", "password": 38, "gender": "others"}
]

3）基于Django自带的serializers组件

# 后端
from django.core import serializers
def ab_ser(request):
    user_queryset = models.User.objects.all()
    res = serializers.serialize('json', user_queryset)
    '''
    serializers 模块内部会帮我们将数据全部变成JSON格式的字符串，并且内部非常的全面
    '''
    return HttpResponse(res)

# 数据展示
[
{"model": "app01.user", "pk": 1, "fields": {"username": "dream", "age": 18, "gender": 1}}, 
{"model": "app01.user", "pk": 2, "fields": {"username": "meng", "age": 28, "gender": 2}}, 
{"model": "app01.user", "pk": 3, "fields": {"username": "hope", "age": 38, "gender": 3}}
]

【二】批量插入

def get_book_bulk(request):
    # 批量插入
    boo_list = []
    for i in range(1000):
        book_obj = models.Book.objects.create(title=f'第{i}本书')
        boo_list.append(book_obj)
    # 批量插入数据
    models.Book.objects.bulk_create(boo_list)
    return render(request, 'books.html', locals())

posted on 2024-07-02 19:47 晓雾-Mist 阅读(20) 评论(0) 收藏举报