48 lines
1.5 KiB
Python
48 lines
1.5 KiB
Python
from django.http import HttpResponse
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from django.shortcuts import render, redirect
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from django.db.models import ObjectDoesNotExist
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from json import dumps
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from hrs.models import Dept, Emp
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def index(request):
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ctx = {
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'greeting': '你好，世界！'
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}
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return render(request, 'index.html', context=ctx)
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def del_dept(request, no='0'):
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try:
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Dept.objects.get(pk=no).delete()
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ctx = {'code': 200}
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except (ObjectDoesNotExist, ValueError):
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ctx = {'code': 404}
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return HttpResponse(
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dumps(ctx), content_type='application/json; charset=utf-8')
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# 重定向 - 给浏览器一个URL, 让浏览器重新请求指定的页面
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# return redirect(reverse('depts'))
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# return depts(request)
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def emps(request, no='0'):
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# no = request.GET['no']
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# dept = Dept.objects.get(no=no)
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# ForeignKey(Dept, on_delete=models.PROTECT, related_name='emps')
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# dept.emps.all()
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# emps_list = dept.emp_set.all()
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# all() / filter() ==> QuerySet
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# QuerySet使用了惰性查询 - 如果不是非得取到数据那么不会发出SQL语句
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# 这样做是为了节省服务器内存的开销 - 延迟加载 - 节省空间势必浪费时间
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emps_list = list(Emp.objects.filter(dept__no=no).select_related('dept'))
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ctx = {'emp_list': emps_list, 'dept_name': emps_list[0].dept.name} \
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if len(emps_list) > 0 else {}
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return render(request, 'emp.html', context=ctx)
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def depts(request):
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ctx = {'dept_list': Dept.objects.all()}
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return render(request, 'dept.html', context=ctx)
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