Question

我有这样一个产品表，其中包含prod_id，prod_name，prod_price ...

let data = $('form').serializeArray();
let answers = {};
data.forEach(function(element) {
    // check if the element contains a answer input value
    if(element.name.indexOf('answer') !== -1) {
        answers[element.name] = element.value;
    }
});

console.log($('form').serialize()); 
// output:  answer%5B1%5D=1&answer%5B2%5D=2&answer%5B4%5D=3&answer%5B3%5D=4&sort=relevance&query=&area=..... etc
console.log(answers.serialize());   
// output: is not a function.

产品价格可以通过以下方式更新：

MySQL [distributor]> select * from products;
+---------+---------+---------------------+------------+-----------------------------------------------------------------------+
| prod_id | vend_id | prod_name           | prod_price | prod_desc                                                             |
+---------+---------+---------------------+------------+-----------------------------------------------------------------------+
| BNBG01  | DLL01   | Fish bean bag toy   |       3.49 | Fish bean bag toy, complete with bean bag worms with which to feed it |
| BNBG02  | DLL01   | Bird bean bag toy   |       3.49 | Bird bean bag toy, eggs are not included                              |
| BNBG03  | DLL01   | Rabbit bean bag toy |       3.49 | Rabbit bean bag toy, comes with bean bag carrots                      |
| BR01    | BRS01   | 8 inch teddy bear   |       5.99 | 8 inch teddy bear, comes with cap and jacket                          |
| BR02    | BRS01   | 12 inch teddy bear  |       8.99 | 12 inch teddy bear, comes with cap and jacket                         |
| BR03    | BRS01   | 18 inch teddy bear  |      11.99 | 18 inch teddy bear, comes with cap and jacket                         |
| RGAN01  | DLL01   | Raggedy Ann         |       4.99 | 18 inch Raggedy Ann doll                                              |
| RYL01   | FNG01   | King doll           |       9.49 | 12 inch king doll with royal garments and crown                       |
| RYL02   | FNG01   | Queen doll          |       9.49 | 12 inch queen doll with royal garments and crown                      |
+---------+---------+---------------------+------------+-----------------------------------------------------------------------+
9 rows in set (0.019 sec)

如果在Django中，我应该先检索Product查询集，然后使用for循环分别提高价格并将其最终保存回数据库中。

当使用原始SQL操作时，如何使用Django ORM更新prod_price？

Answer 1

您可以使用F型

from django.db.models import F
Product.objects.filter(pk__in=ids).update(prod_price=F('prod_price')+1)

在查询过程中增加prod_price

1 个答案: