# F 使用查询条件的值

    #

    # from django.db.models import F

    # models.Tb1.objects.update(num=F('num')+1)

  # Q 构建搜索条件

    from django.db.models import Q

    # con = Q()

    #

    # q1 = Q()

    # q1.connector = 'OR'

    # q1.children.append(('id', 1))

    # q1.children.append(('id', 10))

    # q1.children.append(('id', 9))

    #

    # q2 = Q()

    # q2.connector = 'OR'

    # q2.children.append(('c1', 1))

    # q2.children.append(('c1', 10))

    # q2.children.append(('c1', 9))

    #

    # con.add(q1, 'AND')

    # con.add(q2, 'AND')

    #

    # models.Tb1.objects.filter(con)

    #

    # from django.db import connection

    # cursor = connection.cursor()

    # cursor.execute("""SELECT * from tb where name = %s""", ['Lennon'])

    # row = cursor.fetchone()