圖書管理系統(一)：出版社列表增長、刪除和編輯

時間 2019-12-11

標籤圖書管理系統出版社列表增長刪除編輯简体版

原文原文鏈接

步驟一：前提準備
步驟二：建立出版社列表
步驟三：增長出版社
步驟四：刪除出版社
步驟五：編輯出版社

步驟一：前提準備

1.安裝django： pip install -i http://pypi.douban.com/simple/ django==1.11.11

2.建立一個django項目： Django-admin startproject 項目名(mysite)

3.建立一個app： python3 manage.py startapp 名字(publisher)

4.對項目進行初始化設置：

 
   #settings.py 
  
    INSTALLED_APPS = [ 
  
   'app_publisher'    #把新建app的名字加進去 
  
    ] 
  
    MIDDLEWARE = [ 
  
   #'django.middleware.csrf.CsrfViewMiddleware',    #註釋掉這一行 
  
    ] 
  
    TEMPLATES = [ 
  
    { 
  
       'DIRS': [os.path.join(BASE_DIR, 'templates')],    #在和html相關的設置中，加入路徑，base_dir是項目的根目錄，templates是專門設置的放html的文檔 
  
    } 
  
    ] 
  
    #修改數據庫的設置 
  
   DATABASES = { 
  
       'default': { 
  
           'ENGINE': 'django.db.backends.mysql', 
  
           'HOST': '127.0.0.1', 
  
           'PORT': 3306, 
  
           'NAME': 'mysite',    #新建的數據庫 
  
           'USER': 'root', 
  
           'PASSWORD': 'ren666666' 
  
       } 
  
   } 
  
   STATIC_URL = '/static/' 
  
   #在這裏添加css,js等靜態文件的目錄 
  
   STATICFILES_DIRS = [ 
  
       os.path.join(BASE_DIR, 'static') 
  
   ]

 
   #app_publisher/models.py 
  
   #給數據庫publisher添加表id和name 
  
   class publisher(models.Model): 
  
       id = models.AutoField(primary_key=True) 
  
       name = models.CharField(null=False, max_length=20)

 
   #mysite/mysite/__init__.py 
  
   #啓動pymysql，告訴django用pymysql來代替默認的MySQLdb 
  
   import pymysql 
  
   pymysql.install_as_MySQLdb()

5.數據庫設置完成後，運行命令

    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

至此，準備工做完成！

步驟二：建立出版社列表

1.寫入函數：

 
   #mysite/urls.py 
  
    from app_publisher import views 
  
    urlpatterns = [ 
  
        url(r'publisher_list', views.publisher_list), 
  
    ]

    #app_publisher/views.py 
  
   from django.shortcuts import render, HttpResponse, redirect 
  
   from app_publisher import models 
  
   def publisher_list(request): 
  
       ret = models.publisher.objects.all().order_by('id')    #獲取數據庫中的數據，並賦值爲ret 
  
       return render(request, 'publisher_list.html', {'publisher_list': ret})    把ret（數據庫中的數據）賦值給publisher_list,而後將publisher_list傳到publisher_list.html中

2.這個時候就須要一個顯示列表的html網頁了

 
   #templates.py 
  
    <!DOCTYPE html> 
  
    <html> 
  
    <head> 
  
        <title>出版社列表</title> 
  
    </head> 
  
    <body> 
  
        <a href="/add_publisher/">增長出版社</a> 
  
        <table border='1'> 
  
            <tr> 
  
                <th>序號</th> 
  
                <th>id</th> 
  
                <th>出版社</th> 
  
            </tr> 
  
            #固定格式，for循環來獲取傳入的數據庫中的數據 
  
    {% for publisher in publisher_list %} 
  
           <tr> 
  
               <td>{{ forloop.counter }}</td>    #得到自動的序列 
  
               <td>{{ publisher.id }}</td> 
  
               <td>{{ publisher.name }}</td> 
  
           </tr> 
  
           {% endfor %} 
  
        </table> 
  
    </body> 
  
    </html>

步驟三：設置增長出版社的功能

1.寫入函數

    urlpatterns = [ 
  
   url(r'^add_publisher', 
   views 
   .add_publisher), 
  
    ]

    def add_publisher(request): 
  
    error_msg = '' 
  
        if request.method == 'POST': 
  
            ret = request.POST.get('add_name', 
   None) 
  
            if ret: 
  
   models.publisher.objects.create(name=ret).save()    #將增長的數據保存到數據庫中 
  
                return 
   redirect('/publisher_list/') 
  
            else: 
  
   error_msg = '出版社名字不能爲空！' 
  
        return render(request, 'add_publisher.html', 
   {'error': error_msg})

2.寫入頁面：

 
   #templates/add_publisher.html 
  
   <!DOCTYPE html> 
  
   <html> 
  
   <head> 
  
       <title>增長出版社</title> 
  
   </head> 
  
   <body> 
  
       <form action=" 
   /add_publisher/ 
   " method=" 
   post 
   "> 
  
           <input type="text" name="add_name"><br> 
  
           <input type=" 
   submit 
   " value="提交"> 
  
       </form> 
  
       <p> 
   {{ error }} 
   </p> 
  
   </body> 
  
   </html>

效果演示：

publisher_list:

add_publisher:

publisher_list:

步驟四：刪除出版社

1.寫入函數：

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

    def delete_publisher(request): 
  
        ret = request.GET.get('id', None) 
  
        if ret: 
  
            models.publisher.objects. 
   get(id=ret). 
   delete() 
  
            return 
   redirect('/publisher_list/') 
  
        else: 
  
            return HttpResponse('要刪除的數據不存在')

2.在publisher_list.html文件中增長刪除內容：

    <!DOCTYPE html> 
  
    <html> 
  
    <head> 
  
        <title>出版社列表</title> 
  
    </head> 
  
    <body> 
  
        <a href="/add_publisher/">增長出版社</a> 
  
        <table border='1'> 
  
            <tr> 
  
                <th>序號</th> 
  
                <th>id</th> 
  
                <th>出版社</th> 
  
   <th>操做</th> 
  
            </tr> 
  
            {% for publisher in publisher_list %} 
  
            <tr> 
  
                <td>{{ forloop.counter }}</td> 
  
                <td>{{ publisher.id }}</td> 
  
                <td>{{ publisher.name }}</td> 
  
                <td>< 
   a href=' 
   /delete_publisher/?id={{ publisher.id }}'>刪除</ 
   a></td> 
  
            </tr> 
  
            {% endfor %} 
  
        </table> 
  
    </body> 
  
    </html>

步驟五：編輯出版社

1.寫入函數：

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

    def edit_publisher(request): 
  
            ret = request.GET.get('id', None) 
  
            if ret: 
  
                edit_data = models.publisher.objects.get(id=ret) 
  
                return render(request, 'edit_publisher.html', {'publisher': edit_data}) 
  
            new_name = request.POST.get('edit_name', None) 
  
            ret = request.POST.get('id', None) 
  
            if ret: 
  
                publisher = models.publisher.objects.get(id=ret) 
  
                publisher.name = new_name 
  
                publisher.save() 
  
                return redirect('/publisher_list/')

2.在publisher_list.html文件中增長修改內容：

 
   <td><a href='/edit_publisher/?id={{ publisher.id }}'>修改</a></td> 
  

3.寫edit_publisher.html文件:

    <!DOCTYPE html> 
  
    <html> 
  
    <head> 
  
        <title>修改出版社</title> 
  
    </head> 
  
    <body> 
  
        <h1>修改出版社</h1> 
  
        <form action="/edit_publisher/" method="post"> 
  
            <input type="text" name='id' value="{{ publisher.id}}" style='display:none'> 
  
            <input type="text" name="edit_name" value="{{ publisher.name }}"> 
  
            <input type="submit" value="提交"> 
  
        </form> 
  
        <p>{{ error }}</p> 
  
    </body> 
  
    </html>