2018-11-20　Django 数据库查询之奇技淫巧

• 数据库可变表和可变字段, 在查询中使用 **{role: request.user.username}, 而 role 可以拼接并传入到查询语句中,非常方便

def _query_list_records(search_content, ddate, request, download_status, send_number):
    start_date, end_date = parse_date(ddate)
    role = get_role(request)
    role = "samples__" + role
    if download_status == [1]:
        query_set = Report.objects.filter(
            download_status__in=download_status, path__icontains=search_content, upload_date__gte=start_date,
            upload_date__lte=end_date, samples__send_number__icontains=send_number, **{role: request.user.username})
    else:
        query_set = Report.objects.filter(
            Q(download_status__isnull=True) | Q(download_status__in=download_status),
            path__icontains=search_content, upload_date__gte=start_date, upload_date__lte=end_date,
            samples__send_number__icontains=send_number, **{role: request.user.username})
    return query_set