Django基础--3
Posted aline2
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ORM
django一对多的操作
获取表单的三种方式:views
获取对象 .all() html中获取方式为 row.id,row,host
获取字典 .all().values("字段","字段","字段",……) row.id,row,host
获取元祖 .all().values_list("字段","字段","字段",……) row.0,row.1
#views from django.shortcuts import render from app import models # Create your views here. def home(request): v1 = models.Host.objects.all() print(v1) #<QuerySet [<Host: Host object (1)>, <Host: Host object (2)>, <Host: Host object (3)>]> 对象 v2 = models.Host.objects.all().values("host","port") print(v2) #< QuerySet[{‘host‘: ‘a‘, ‘port‘: 80}, {‘host‘: ‘b‘, ‘port‘: 81}, {‘host‘: ‘c‘, ‘port‘: 82}] > 字典类型 v3 = models.Host.objects.all().values_list("host","port") print(v3) #<QuerySet [(‘a‘, 80), (‘b‘, 81), (‘c‘, 82)]> 元祖类型 retur #html中 <body> <h1>主机信息</h1> <ul> {% for row in v1 %} <li>{{ row.id }}--- {{ row.host }}--- {{ row.ip }}--- {{ row.port }}--- {{ row.dept_id }}</li> {% endfor %} </ul> <h1>主机信息</h1> <ul> {% for row in v2 %} <li>{{ row.host }}--- {{ row.port }}</li> {% endfor %} </ul> <h1>主机信息</h1> <ul> {% for row in v3 %} <li>{{ row.0 }}--- {{ row.1 }}</li> {% endfor %} </ul> </body>
一对多的跨表操作
获取对象 filter(id__gte=1)
#views def host(request): v1 = models.Host.objects.filter(id__gte=1) return render(request,"host.html",{"v1":v1}) #urls.py from app import views path(‘host/‘, views.host), #host.html <body> <table border="1"> <thead> <tr> <th>id</th> <th>主机名</th> <th>主机ip</th> <th>主机端口</th> <th>业务线</th> <th>部门</th> <th>部门代码</th> </tr> </thead> <tbody> {% for row in v1 %} <tr> <td>{{ row.id }}</td> <td>{{ row.host }}</td> <td>{{ row.ip }}</td> <td>{{ row.port }}</td> <td>{{ row.dept_id }}</td> <td>{{ row.dept.dept }}</td> <td>{{ row.dept.dept_en }}</td> </tr> {% endfor %} </tbody> </table> </body>
以上将所有的数据都显示出来了，然而实际中并用不到这么多，这里可以隐藏两个表的id，因每次都会循环tr,直接在<tr>中定义两个属性放id
这里修改下tbody里面内容即可
<tbody> {% for row in v1 %} <tr hid = "{{ row.id }}" bid = "{{ row.dept.id }}"> <td>{{ row.host }}</td> <td>{{ row.ip }}</td> <td>{{ row.port }}</td> <td>{{ row.dept.dept }}</td> </tr> {% endfor %} </tbody>
获取字典 filter(id__gte=1).values("id","ip", "port", "dept_id","dept__dept")
#views.py #获取类型为字典 v2 = models.Host.objects.filter(id__gte=1).values("id","ip", "port", "dept_id","dept__dept") #print(v2) # <QuerySet [{‘ip‘: ‘1.1.1.1‘, ‘host‘: ‘a‘, ‘dept__dept‘: ‘运维‘}, {‘ip‘: ‘1.1.1.2‘, ‘host‘: ‘b‘, ‘dept__dept‘: ‘销售‘}, {‘ip‘: ‘1.1.1.3‘, ‘host‘: ‘c‘, ‘dept__dept‘: ‘信息部‘}]> for i in v2: print(i["id"],i["ip"],i["port"],i["dept__dept"])
return render(request,"host.html",{"v2":v2})
前端操作： <h2>业务线-字典</h2> <table border="1"> <thead> <tr> <th>主机ip</th> <th>主机端口</th> <th>部门</th> </tr> </thead> <tbody> {% for row in v2 %} <tr hid = "{{ row.id }}" bid = "{{ row.dept_id }}"> <td>{{ row.ip }}</td> <td>{{ row.port }}</td> <td>{{ row.dept__dept }}</td> </tr> {% endfor %} </tbody> </table>
获取元祖 filter(id__gte=1).values_list("id","ip", "port", "dept_id","dept__dept")
v3 = models.Host.objects.filter(id__gte=1).values_list("id","ip", "port", "dept_id","dept__dept") for j in v3: print(j[0],j[1],j[2],j[3],j[4],) return render(request,"host.html",{"v3":v3})
<h2>业务线-元祖</h2>
<table border="1">
<thead>
<tr>
<th>主机ip</th>
<th>主机端口</th>
<th>部门</th>
</tr>
</thead>
<tbody>
{% for row in v3 %}
<tr hid = "{{ row.0 }}" bid = "{{ row.3 }}">
<td>{{ row.1 }}</td>
<td>{{ row.2 }}</td>
<td>{{ row.4}}</td>
</tr>
{% endfor %}
</tbody>
</table>
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