圖書管理系統(三)：做者列表增長、刪除和編輯

時間 2019-12-09

標籤圖書管理系統列表增長刪除編輯简体版

原文原文鏈接

步驟一：建立做者列表
步驟二：添加做者
步驟三：刪除做者
步驟四：編輯做者

步驟一：建立做者列表

1.先建立數據表

    class Author(models.Model): 
  
        id = models.AutoField(primary_key=True) 
  
        name = models.CharField(max_length=32, null=False, unique=True) 
  
       book = models.ManyToManyField(to='Book')    #會自動生成第三方表，內容是id，author_id,book_id，而後添加數據

2.寫入函數：

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

    def author_list(request): 
  
        datas = models.Author.objects.all() 
  
        return render(request, 'author_list.html', {'datas': datas})

3.寫html文件：

    <!DOCTYPE html> 
  
    <html> 
  
    <head> 
  
        <title>做者列表</title> 
  
    </head> 
  
    <body> 
  
    <h1>做者列表</h1> 
  
    <table border="1"> 
  
    <thead> 
  
        <tr> 
  
            <th>序號</th> 
  
            <th>id</th> 
  
            <th>做者</th> 
  
            <th>做品</th> 
  
        </tr> 
  
    </thead> 
  
    <tbody> 
  
        {% for data in datas %} 
  
        <tr> 
  
            <td>{{ forloop.counter }}</td> 
  
            <td>{{ data.id }}</td> 
  
            <td>{{ data.name }}</td> 
  
            <td> 
  
            {% for book in data.book.all %} 
  
    {% if forloop.last %}    #if判斷，若是是倒數第二個，則不加；，不然加 
  
                    {{ book.title }} 
  
                {% else %} 
  
                    {{ book.title }}; 
  
                {% endif %} 
  
            {% endfor %} 
  
            </td> 
  
        </tr> 
  
        {% endfor %} 
  
    </tbody> 
  
    </table> 
  
    </body> 
  
    </html>

步驟二：添加做者

1.寫入函數：

    url(r'^add_author', views.add_author), 
  

    def add_author(request): 
  
        if request.method == 'POST': 
  
            new_name = request.POST.get('add_name') 
  
            new_books = request.POST. 
   getlist('books') 
  
            ret = models.Author.objects.create(name=new_name) 
  
            ret.book. 
   set(new_books) 
  
            ret.save() 
  
            return redirect('/author_list/') 
  
        ret = models.Book.objects.all() 
  
        return render(request, 'add_author.html', {'book_list': ret})

2.寫html文件：

    <!DOCTYPE html> 
  
    <html> 
  
    <head> 
  
        <title>添加做者</title> 
  
    </head> 
  
    <body> 
  
    <h1>添加做者</h1> 
  
    <form action="/add_author/" method="post"> 
  
        做者:<input type="text" name="add_name"> 
  
        <select name="books" multiple=' 
   multiple'> 
  
            {% for book in book_list %} 
  
            <option value="{{ book.id }}">{{ book.title }}</option> 
  
            {% endfor %} 
  
        </select> 
  
        <input type="submit" value="提交"> 
  
    </form> 
  
    </body> 
  
    </html>

（遺留了一個問題：表單的多選沒有生效）

步驟三：刪除做者

1.寫入函數：

    url(r'^delete_author', views.delete_author), 
  

    def delete_author(request): 
  
        ret = request.GET.get('id') 
  
        models.Author.objects.get(id=ret).delete() 
  
        return redirect('/author_list/')

2.寫入html文件：

    <td><a href="/delete_author/?id={{ data.id }}">刪除</a></td> 
  

步驟四：修改做者

1.寫入函數：

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

    def edit_author(request): 
  
        if request.method == 'POST': 
  
            edit_id = request.POST.get('edit_id') 
  
            print('------------') 
  
            print(edit_id) 
  
            print('------------------') 
  
            ret = request.POST.get('edit_name') 
  
            datas = request.POST.getlist('books') 
  
            print('=!'*200) 
  
            author = models.Author.objects.get(id=edit_id) 
  
            print('='*23) 
  
            author.name = ret 
  
            author.book.set(datas) 
  
            author.save() 
  
            return redirect('/author_list/') 
  
        ret = request.GET.get('id') 
  
        data = models.Author.objects.get(id=ret) 
  
        ret = models.Book.objects.all() 
  
        return render(request, 'edit_author.html',{'book_list': ret, 'data':data})

2.寫html文件：

    <!DOCTYPE html> 
  
    <html> 
  
    <head> 
  
        <title>編輯做者</title> 
  
    </head> 
  
    <body> 
  
    <h1>編輯做者</h1> 
  
    <form action="/edit_author/" method="post"> 
  
        <input type="text" name="edit_id" value='{{ data.id }}' style="display: none"> 
  
        做者:<input type="text" name="edit_name" value="{{ data.name }}"> 
  
        <select multiple name="books"> 
  
            {% for book in book_list %} 
  
                {% if book in data.book.all %} 
  
                    <option selected value="{{ book.id }}">{{ book.title }}</option> 
  
                {% else %} 
  
                    <option value="{{ book.id }}">{{ book.title }}</option> 
  
                {% endif %} 
  
            {% endfor %} 
  
        </select> 
  
        <input type="submit" value="提交"> 
  
    </form> 
  
    </body> 
  
    </html>

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