平淡的流年 - django 操作数据库的一些玩意儿

django 操作数据库的一些玩意儿

发布时间：2019-04-27 11:40:47 编辑：龙龙龙分类：技术文档

1、models.AutoField　　自增列 = int(11)
　　如果没有的话，默认会生成一个名称为 id 的列，如果要显示的自定义一个自增列，必须将给列设置为主键 primary_key=True。2、models.CharField　　字符串字段
　　必须 max_length 参数3、models.BooleanField　　布尔类型=tinyint(1)
　　不能为空，Blank=True4、models.ComaSeparatedIntegerField　　用逗号分割的数字=varchar
　　继承CharField，所以必须 max_lenght 参数5、models.DateField　　日期类型 date
　　对于参数，auto_now = True 则每次更新都会更新这个时间；auto_now_add 则只是第一次创建添加，之后的更新不再改变。6、models.DateTimeField　　日期类型 datetime
　　同DateField的参数7、models.Decimal　　十进制小数类型 = decimal
　　必须指定整数位max_digits和小数位decimal_places8、models.EmailField　　字符串类型（正则表达式邮箱） =varchar
　　对字符串进行正则表达式9、models.FloatField　　浮点类型 = double10、models.IntegerField　　整形11、models.BigIntegerField　　长整形
　　integer_field_ranges = {
　　　　'SmallIntegerField': (-32768, 32767),
　　　　'IntegerField': (-2147483648, 2147483647),
　　　　'BigIntegerField': (-9223372036854775808, 9223372036854775807),
　　　　'PositiveSmallIntegerField': (0, 32767),
　　　　'PositiveIntegerField': (0, 2147483647),
　　}12、models.IPAddressField　　字符串类型（ip4正则表达式）13、models.GenericIPAddressField　　字符串类型（ip4和ip6是可选的）
　　参数protocol可以是：both、ipv4、ipv6
　　验证时，会根据设置报错14、models.NullBooleanField　　允许为空的布尔类型15、models.PositiveIntegerFiel　　正Integer16、models.PositiveSmallIntegerField　　正smallInteger17、models.SlugField　　减号、下划线、字母、数字18、models.SmallIntegerField　　数字
　　数据库中的字段有：tinyint、smallint、int、bigint19、models.TextField　　字符串=longtext20、models.TimeField　　时间 HH:MM[:ss[.uuuuuu]]21、models.URLField　　字符串，地址正则表达式22、models.BinaryField　　二进制23、models.ImageField   图片24、models.FilePathField 文件

1、null=True
　　数据库中字段是否可以为空2、blank=True
　　django的 Admin 中添加数据时是否可允许空值3、primary_key = False
　　主键，对AutoField设置主键后，就会代替原来的自增 id 列4、auto_now 和 auto_now_add
　　auto_now   自动创建---无论添加或修改，都是当前操作的时间
　　auto_now_add  自动创建---永远是创建时的时间5、choices
GENDER_CHOICE = (
        (u'M', u'Male'),
        (u'F', u'Female'),
    )
gender = models.CharField(max_length=2,choices = GENDER_CHOICE)6、max_length7、default　　默认值8、verbose_name　　Admin中字段的显示名称9、name|db_column　　数据库中的字段名称10、unique=True　　不允许重复11、db_index = True　　数据库索引12、editable=True　　在Admin里是否可编辑13、error_messages=None　　错误提示14、auto_created=False　　自动创建15、help_text　　在Admin中提示帮助信息16、validators=[]17、upload-to

    # 增
    #    # models.Tb1.objects.create(c1='xx', c2='oo')  增加一条数据，可以接受字典类型数据 **kwargs

    # obj = models.Tb1(c1='xx', c2='oo')
    # obj.save()

    # 查
    #    # models.Tb1.objects.get(id=123)         # 获取单条数据，不存在则报错（不建议）
    # models.Tb1.objects.all()               # 获取全部
    # models.Tb1.objects.filter(name='seven') # 获取指定条件的数据

    # 删
    #    # models.Tb1.objects.filter(name='seven').delete() # 删除指定条件的数据

    # 改
    # models.Tb1.objects.filter(name='seven').update(gender='0')  # 将指定条件的数据更新，均支持 **kwargs
    # obj = models.Tb1.objects.get(id=1)
    # obj.c1 = '111'
    # obj.save()                                                 # 修改单条数据

    # 获取个数
    #    # models.Tb1.objects.filter(name='seven').count()

    # 大于，小于
    #    # models.Tb1.objects.filter(id__gt=1)              # 获取id大于1的值
    # models.Tb1.objects.filter(id__lt=10)             # 获取id小于10的值
    # models.Tb1.objects.filter(id__lt=10, id__gt=1)   # 获取id大于1 且 小于10的值

    # in
    #    # models.Tb1.objects.filter(id__in=[11, 22, 33])   # 获取id等于11、22、33的数据
    # models.Tb1.objects.exclude(id__in=[11, 22, 33])  # not in

    # contains
    #    # models.Tb1.objects.filter(name__contains="ven")
    # models.Tb1.objects.filter(name__icontains="ven") # icontains大小写不敏感
    # models.Tb1.objects.exclude(name__icontains="ven")

    # range
    #    # models.Tb1.objects.filter(id__range=[1, 2])   # 范围bettwen and

    # 其他类似
    #    # startswith，istartswith, endswith, iendswith,

    # order by
    #    # models.Tb1.objects.filter(name='seven').order_by('id')    # asc
    # models.Tb1.objects.filter(name='seven').order_by('-id')   # desc

    # limit 、offset
    #    # models.Tb1.objects.all()[10:20]

    # group by
    from django.db.models import Count, Min, Max, Sum    # models.Tb1.objects.filter(c1=1).values('id').annotate(c=Count('num'))
    # SELECT "app01_tb1"."id", COUNT("app01_tb1"."num") AS "c" FROM "app01_tb1" WHERE "app01_tb1"."c1" = 1 GROUP BY "app01_tb1"."id"

def upload_file_ajax(request):    if request.method == "POST":
        request.upload_file_obj.get('file_name1')
        iter_file_data = upload_file_obj.chunks()
        f = open(upload_file_obj.name, 'w')        # 将大文件分块，每次 64k
        for d in iter_file_data:
            f.write(d)
        f.close()    return render(request, 'upload/_file.html')

获取session：request.session[key]

　　设置session：reqeust.session[key] = value

　　删除session：del request[key]

----平淡的流年

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