django 项目 crm数据锁 和 快速展示记录创建

课程记录的管理:

根据班级去创建课程记录

展示课程记录

修改课程记录

学生的学习记录(上课记录的管理)

根据班级.课程记录创建学习记录

展示学习记录

编辑学习记录

表锁:

行锁:(在sql中):

例子:    事物+锁

begin; 开始

select * from  app01 where id =1 for update;  为了更新,查询可以

commit;  结束

在django中先开启事物开启锁

from django.db import transaction  #引入事物

def multi_apply(self, request):

obj_ids = request.POST.getlist('id')

        count = models.Customer.objects.filter(consultant=request.user).count()

 

        if count + len(obj_ids) > settings.MAX_CUSTOMER_NUM:

            return HttpResponse('做人不贪心，先根跟进自己的就行了')

        flag = False

        with transaction.atomic():  #事物函数

            old = models.Customer.objects.filter(id__in=obj_ids, consultant__isnull=True).select_for_update()  #先查询到并且加上select_for_update()   锁

 

            if len(obj_ids) == len(old):  #判断长度是否一致

                time.sleep(10)

                models.Customer.objects.filter(id__in=obj_ids).update(consultant=request.user) #执行更改

                flag = True

        if not flag:  #进行判断是否执行成功

            return HttpResponse('手速太慢，已经别别人抢走了')

在django中使用逻辑限制:限制销售的客户

在settings中:MAX_CUSTOMER_NUM = 150

在views中引入:

from django.conf import settings   #引入

使用时settings.MAX_CUSTOMER_NUM 来使用

批量初识化学习记录::(为每一个学生建立)

def multi_init(self, request):

    course_ids = request.POST.getlist('id')  #查询到id

    course_obj_list = models.CourseRecord.objects.filter(id__in=course_ids)   #在数据库中找到对象

    for course_obj in course_obj_list:

        stu_list = course_obj.re_class.customer_set.all().filter(status='studying') #循环找到要找的参数

        studury_record_list = []   #建立空列表

        for stu_obj in stu_list:  #循环所有的参数

            #models.StudyRecord.objects.create(student=stu_obj,course_record=course_obj)  #一种写法

            studury_record_list.append(models.StudyRecord(student=stu_obj, course_record=course_obj))  #建立空的models.StudyRecord,进行加入到列表中

        models.StudyRecord.objects.bulk_create(studury_record_list, batch_size=3) #使用bulk_create进行添加  batch_size限制条数

展示记录:

forms中:

class StudyRecordForm(BaseForm):

    class Meta:

        model = models.StudyRecord

        fields = ['attendance','score','homework_note','note']

在html中:

{% extends 'layout.html' %}

 

{% block content %}

    <div class="panel panel-primary">

        <div class="panel-heading">学习记录列表</div>

        <div class="panel-body">

 

            <form action="" method="post" class="form-inline">

                {% csrf_token %}

                {{ form_obj.management_form }}  #必写的

                <table class="table table-hover">

                    <thead>

                    <tr>

 

                        <th>学生姓名</th>

                        <th>考勤</th>

                        <th>成绩</th>

                        <th>作业批注</th>

                        <th>备注</th>

                    </tr>

                    </thead>

                    <tbody>

                    {% for studyrecord in form_obj %}

                        <tr>{{ studyrecord.id }}  #必写的

                           <td>{{ studyrecord.instance.student }} 

</td>   #studyrecord.instance,当前学生的

                           <td>{{ studyrecord.attendance }}</td>

                           <td>{{ studyrecord.score }}</td>

                           <td>{{ studyrecord.homework_note }}</td>

                           <td>{{ studyrecord.note }}</td>

                        </tr>

 

                    {% endfor %}

 

                    </tbody>

                </table>

            <button class="btn btn-primary">保存</button>

            </form>

            <div class="text-center">

                <nav aria-label="Page navigation">

                    <ul class="pagination">

                        {{ page_html }}

                    </ul>

                </nav>

            </div>

        </div>

    </div>

{% endblock %}

 

在views:

from django.forms import modelformset_factory  #先引入

def study_record(request, course_record_id):

    FormSet = modelformset_factory(models.StudyRecord, StudyRecordForm, extra=0)   #在这里实例化一个类 顺序:mdoels,forms,extra(这是现实空白否)

    queryset = models.StudyRecord.objects.filter(course_record_id=course_record_id)

#在数据库中找到对象是queryset对象

    form_obj = FormSet(queryset=queryset)  #使用类   中的queryset赋值

    if request.method == 'POST':

        form_obj = FormSet(request.POST)

        if form_obj.is_valid():

            form_obj.save()

    return render(request, 'study_record_list.html', {'form_obj': form_obj})  #传过去