django-orm更新資料
阿新 • • 發佈：2021-08-10
django-orm更新資料
單個數據修改（更新單個數據）
In [6]: b1=Book.objects.get(id=1) In [7]: b1.price Out[7]: Decimal('20.00') In [8]: b1.price=22 mysql> select * from book where id=1; +----+--------+-------+--------------+-----------------------+ | id | title | price | market_price | pub | +----+--------+-------+--------------+-----------------------+ | 1 | python | 20.00 | 25.00 | 清華大學出版社 | +----+--------+-------+--------------+-----------------------+ 1 row in set (0.00 sec) In [9]: b1.save() mysql> select * from book where id=1; +----+--------+-------+--------------+-----------------------+ | id | title | price | market_price | pub | +----+--------+-------+--------------+-----------------------+ | 1 | python | 22.00 | 25.00 | 清華大學出版社 | +----+--------+-------+--------------+-----------------------+ 1 row in set (0.00 sec)
批量資料更新
In [10]: b2=Book.objects.filter(pub='清華大學出版社')
In [11]: b2.update(price=1)
Out[11]: 3
In [12]: for i in b2:
...: print(i.price)
...:
1.00
1.00
1.00
views.py
def update(request,book_id): try: book=Book.objects.get(id=book_id) except Exception as e: print('---update book error is %s----'%(e)) return HttpResponse('更新書籍不存在') if request.method=='GET': id=book.id title=book.title pub=book.pub price=book.price market_price=book.market_price return render(request,'bookstore/update.html',locals()) elif request.method=='POST': id=book.id update_book=Book.objects.get(id=id) price=request.POST.get('price') market_price=request.POST.get('market_price') update_book.price=price update_book.market_price=market_price update_book.save() url=reverse('all_book') return HttpResponseRedirect(url) # return HttpResponseRedirect('/bookstore/all_book')
all_book.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>顯示所有書籍</title> </head> <body> <table border="1"> <tr> <th>id</th> <th>title</th> <th>pu</th> <th>price</th> <th>market_price</th> <th>op</th> </tr> {% for info in all_book %} <tr> <td>{{info.id}}</td> <td>{{info.title}}</td> <td>{{info.pub}}</td> <td>{{info.price}}</td> <td>{{info.market_price}}</td> <td> <a href="{% url 'update' info.id %}">更新</a> <a href="">刪除</a> </td> </tr> {% endfor %} </table> </body> </html>
update.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>更新資料</title>
</head>
<body>
<form action="{% url 'update' id %}" method="POST">
{% csrf_token%}
<span>title</span><input type="text" value={{title}} disabled='disabled'> <br>
<span>pub</span><input type="text" value={{pub}} disabled='disabled'> <br>
<span>price</span><input type="text" name="price" value={{price}}> <br>
<span>market_price</span><input type="text" name="market_price" value={{market_price}}> <br>
<input type="submit" value="更新">
</form>
</body>
</html>
urls.py
from django.contrib import admin
from django.urls import path,include
from . import views
urlpatterns = [
path('admin/', admin.site.urls),
path('showimg/',views.showimg),
path('music/',include('music.urls')),
path('bookstore/',include('bookstore.urls'))
]
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