如何从数据库中检索数据并将其显示在文本框中以供用户更新答案

【问题标题】：How to retrieve the data from the database and display it in a textbox for users to update it如何从数据库中检索数据并将其显示在文本框中以供用户更新
【发布时间】：2021-12-19 05:07:02
【问题描述】：

我有一个网页，它应该允许用户更新数据库中的数据，但数据无法在文本框中显示，我该如何让它能够在文本框中显示？

这是我当前的网页，用户需要在其中手动输入他们想要在文本框中更新的所有数据。

我想要的是这样，数据已经从数据库中检索出来供用户查看，假设他们要更新客户名称，他们只需要更改客户名称并单击提交按钮即可更新它，如何使它能够检索数据？

views.py

@login_required()
def updatedata(request, id):
    photo = Photo.objects.get(id=id)
    if request.method == 'POST':
        Photo.mcoNum = request.POST.get('mcoNum')
        Photo.reception = request.POST.get('reception')

        form = UpdateForm(request.POST)
        if form.is_valid():
            form.save()
            return redirect('logdata')
    else:
        form = UpdateForm

    return render(request, 'updatedata.html', {'form': form})

updatedata.html

<!doctype html>
{% extends "home.html" %}
{% block content %}
{% load static %}

<br><br>
    <h2 class="text-center">Edit Log Data</h2>
    <hr>
    <div class="col-md-6 offset-md-3">
        <form method="POST">
            {% csrf_token %}

            {{ form.as_p }}
            <input type="submit" value="Update" class="btn btn-secondary">
        </form>
    </div>
{% endblock %}

forms.py

class UpdateForm(forms.ModelForm):
    mcoNum = forms.CharField(label="", widget=forms.TextInput(
        attrs={"class": "form-control", "placeholder": "MCO Number"}))
    reception = forms.CharField(label="", max_length=100, widget=forms.TextInput(
        attrs={"class": "form-control", "placeholder": "reception"}))
    partno = forms.CharField(label="", max_length=100, widget=forms.TextInput(
        attrs={"class": "form-control", "placeholder": "Part Number"}))
    serialno = forms.CharField(label="", max_length=100,
                               widget=forms.TextInput(attrs={"class": "form-control", "placeholder": "Serial Number"}))
    Customername = forms.CharField(label="", max_length=100,
                               widget=forms.TextInput(attrs={"class": "form-control", "placeholder": "Customer Name"}))
    class Meta:
        model = Photo
        fields = ("mcoNum", "reception", "partno", "serialno", "Customername",)

【问题讨论】：

标签： html django django-views django-forms

【解决方案1】：

试试这个。你必须在表单中传递实例（照片）。

@login_required()
def updatedata(request, id):
    photo = Photo.objects.get(id=id)
    if request.method == 'POST':
        Photo.mcoNum = request.POST.get('mcoNum')
        Photo.reception = request.POST.get('reception')

        form = UpdateForm(request.POST,instance=photo)
        if form.is_valid():
            form.save()
            return redirect('logdata')
    else:
        form = UpdateForm(instance=photo)

    return render(request, 'updatedata.html', {'form': form})

【讨论】：

诶，不行，先试试，文本框就是不显示数据
@Shadowwalker 创建一个聊天，我们将讨论它。
@Shadowwalker 以<form action = '{% url 'your-url-of-updatedata' %} method="POST">的形式在动作中添加url
chat.stackoverflow.com/rooms/238895/…

【解决方案2】：

您必须将模型数据从视图传递到模板您可能必须在您的视图中起作用，这里引用一页是示例

# here is first function that send information to your fields
# i suggest you to use id in url and here to recognize which record you are updating
def editbox(request,id)
    # here we get informations from model database
    data = yourmodel.objects.get(id=id) #here yourmodel is your actual model name that you have to import above
    return render(request,'updatedata.html',{"data":data}) # and here we pass to html


# secondly you have to update and edit your data
def FunctionName(request,id):
    updateme = yourmodel.objects.get(id=id) # here we have to use again to recognize which data we're updating
    form = yourupdateform(request.POST,instance=updateme) # it send data 
    if form.is_valid: 
        form.save()
        return redirect('logdata') # redirect if you want

现在您需要制作表单：

from django import forms
from .models import yourmodel

class formname(forms.ModelForm):
    model=yourmodel
    fields="__all__" # this will update all the fields of model class

您必须编辑 url 以将 id 从 url 传递给这些函数才能工作

   # you need to have two function, one of them is for editing and ecyrything is there and other is just for update
   # replace your function name there
   path('edit/<int:id>',views.youreditfunction')
   path('update/<int:id>',views.yourupdatefunction')

现在是时候制作html了：

   <br><br>
    <h2 class="text-center">Edit Log Data</h2>
    <hr>
    <div class="col-md-6 offset-md-3">
        <form action="/update/{{ data.id }}" method="post">
            <!-- here you can style your forms and etc i dont focus on here -->
            {% crf_token %}

            # here is an example of what you can do you can write as much as you want
            <input type="text" class="form-control" value="{{ data.username }}">

            <input type="submit" value="Update">
        </form>
    </div>

我认为这种方式有效，但不是 100%

【讨论】：