圖書管理系統(二)：圖書列表的增長、刪除和編輯

時間 2019-12-08

標籤圖書管理系統圖書列表增長刪除編輯简体版

原文原文鏈接

步驟一：建立圖書列表
步驟二：增長圖書
步驟三：刪除圖書
步驟四：編輯圖書

步驟一：建立圖書列表

1.建立數據庫Book：

    #app_publisher/models.py 
  
    class Book(models.Model): 
  
        id = models.AutoField(primary_key=True) 
  
        title = models.CharField(max_length=64, null=False, unique=True) 
  
       publisher = models.ForeignKey(to='publisher') 
  
        #因爲ForeignKey會自動把publisher屬性後面加_id,也就是數據庫中是publisher_id,所以在這裏把_id給去掉了

    python3 manage.py makemigrations    #用小本本將models.py裏面的改動記錄下來，記錄到app1/migrations文件夾下面 
  
    python3 manage.py migrate    #把改動翻譯成SQL語句去數據庫執行

2.寫入函數：

    url(r'^book_list/', views.book_list), 
  

    def book_list(request): 
  
        data = models.Book.objects.all() 
  
        return render(request, 'book_list.html', {'data': data})

3.寫book_list.html文件：

    <!DOCTYPE html> 
  
    <html> 
  
    <head> 
  
        <title>圖書列表</title> 
  
    </head> 
  
    <body> 
  
    <table border='1'> 
  
        <tr> 
  
            <th>序號</th> 
  
            <th>id</th> 
  
            <th>title</th> 
  
            <th>publisher</th> 
  
        </tr> 
  
        {% for i in data %} 
  
            <tr> 
  
                <td>{{ forloop.counter }}</td> 
  
                <td>{{ i.id }}</td> 
  
                <td>{{ i.title }}</td> 
  
                <td>{{ 
   i.publisher.name }}</td> 
  
            </tr> 
  
        {% endfor %} 
  
    </table> 
  
    </body> 
  
    </html>

步驟二：增長圖書

1.寫入函數：

    url(r'^add_book/', views.add_book), 
  

    def add_book(request): 
  
        if request.method == 'POST': 
  
            add_name = request.POST.get('add_name') 
  
            new_publisher = request.POST.get('publisher') 
  
            models.Book.objects.create(title=add_name, publisher_id=new_publisher).save() 
  
            return redirect('/book_list/') 
  
        data = models.publisher.objects.all() 
  
        return render(request, 'add_book.html', {'data': data})

2.寫html文件：

    <a href="/add_book/">添加新圖書</a> 
  

    <!DOCTYPE html> 
  
    <html> 
  
    <head> 
  
        <title>增長圖書</title> 
  
    </head> 
  
    <body> 
  
        <h1>增長圖書</h1> 
  
        <form action="/add_book/" method="post"> 
  
            <input type="text" name="add_name"> 
  
            出版社: 
  
            <select name='publisher'> 
  
            {% for i in data %} 
  
                <option value="{{ i.id }}">{{ i.name }}</option> 
  
            {% endfor %} 
  
            </select> 
  
            <input type="submit" value="提交"> 
  
        </form> 
  
    </body> 
  
    </html>

步驟三：刪除圖書

1.寫入函數：

    url(r'^delete_book/', views.delete_book), 
  

    def delete_book(request): 
  
        ret = request.GET.get('id') 
  
        models.Book.objects.get(id=ret).delete() 
  
       return redirect('/book_list/')

2.在book_list.html中增長刪除功能：

        {% for i in data %} 
  
            <tr> 
  
                <td>{{ forloop.counter }}</td> 
  
                <td>{{ i.id }}</td> 
  
                <td>{{ i.title }}</td> 
  
                <td>{{ i.publisher.name }}</td> 
  
    <td><a href="/delete_book/?id={{ i.id }}">刪除</a></td> 
  
            </tr> 
  
        {% endfor %}

步驟四：編輯圖書

1.寫入函數：

   url(r'^edit_book/', views.edit_book), 
 

   def edit_book(request): 
 
       if request.method == 'POST': 
 
           edit_id = request.POST.get('edit_id') 
 
           edit_name = request.POST.get('edit_title') 
 
           print(edit_name) 
 
           edit_publisher = request.POST.get('edit_publisher') 
 
           ret = models.Book.objects.get(id=edit_id) 
 
           ret.title = edit_name 
 
           ret.publisher_id = edit_publisher 
 
           ret.save() 
 
           return redirect('/book_list/') 
 
       edit_id = request.GET.get('id') 
 
       ret = models.Book.objects.get(id=edit_id) 
 
       datas = models.publisher.objects.all() 
 
       return render(request, 'edit_book.html', {'datas': datas, 'ret':ret})

2.寫html文件：

   <td><a href="/edit_book/?id={{ i.id }}">編輯</a></td> 
 

   <!DOCTYPE html> 
 
   <html> 
 
   <head> 
 
       <title>修改圖書</title> 
 
   </head> 
 
   <body> 
 
   <h1>修改圖書</h1> 
 
  <form action="/edit_book/" method="post"> 
 
      <input type="text" name="edit_id" value="{{ ret.id }}" style="display: none"> 
 
      <input type="text" name='edit_title' value="{{ret.title}}"> 
 
      <select name="edit_publisher"> 
 
          {% for data in datas %} 
 
              {% if ret.publisher_id == data.id %} 
 
                  <option selected value="{{ data.id }}">{{ data.name }}</option> 
 
              {% else %} 
 
                  <option value="{{ data.id }}">{{ data.name }}</option> 
 
              {% endif %} 
 
          {% endfor %} 
 
      </select> 
 
       <input type="submit" value="提交"> 
 
   </form> 
 
   </body> 
 
   </html>

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