Common filter operation
Greater than, greater than or equal:
__gt greater than>
__gte greater than or equal> =
Student.objects.filter (age__gt = 10) // Query older than 10 year-old student
Student.objects.filter (age__gte = 10) // Query older than or equal to 10-year-old student
special attention: underline here is double underlined, are also following the introduction of double-underlined.
Less than, less than or equal:
__lt less than <
__lte Less than or equal <=
Student.objects.filter (age__lt = 10) // Query students younger than 10 years old
Student.objects.filter (age__lte = 10) // query aged less than or equal to 10-year-old student
like:
__exact exactly equal like 'AAA'
__iexact ignore case exactly equal iLike 'AAA'
__contains comprises like '%% AAA'
__icontains, ignore the case ilike '% aaa%', but for sqlite, it contains effect equivalent to icontains.
in:
__in
query aged students a range of
Student.objects.filter (age__in = [10, 20, 30])
IS null / IS not null:
__isnull sentenced empty
Student.objects.filter (name__isnull = True) // queries the user name is blank student
Student.objects.filter (name__isnull = False) // queries the user name is not empty of students
is not equal to / is not included in:
Student.objects.filter (). Excute (age = 10) // query the age of 10 are not students of
Student.objects.filter (). Excute (age__in = [10, 20]) // query is not the age of [10, 20 ] students
other common fuzzy queries:
__startswith to begin with ...
__istartswith beginning to ... ignore case
__endswith to ... end
__iendswith ending ..., ignore case
__range within ... range
__year year date field
__month month date field
day __day date field of
multi-table join query:
A class (models.Model):
name = models.CharField (U 'name')
class B (models.Model):
AA = models.ForeignKey (A)
B.objects.filter (aa__name__contains = 'searchtitle') query # B table aa foreign key columns in the table corresponding to table B contains the name of the object searchtitle.
Query API
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
|
<
1
>
all
(): 查询所有结果
<
2
>
filter
(
*
*
kwargs): 它包含了与所给筛选条件相匹配的对象
<
3
> get(
*
*
kwargs): 返回与所给筛选条件相匹配的对象，返回结果有且只有一个，
如果符合筛选条件的对象超过一个或者没有都会抛出错误。
<
4
> exclude(
*
*
kwargs): 它包含了与所给筛选条件不匹配的对象
<
5
> order_by(
*
field): 对查询结果排序
<
6
> reverse(): 对查询结果反向排序
<
8
> count(): 返回数据库中匹配查询(QuerySet)的对象数量。
<
9
> first(): 返回第一条记录
<
10
> last(): 返回最后一条记录
<
11
> exists(): 如果QuerySet包含数据，就返回
True
，否则返回
False
<
12
> values(
*
field): 返回一个ValueQuerySet——一个特殊的QuerySet，运行后得到的并不是一系列
model的实例化对象，而是一个可迭代的字典序列
<
13
> values_list(
*
field): 它与values()非常相似，它返回的是一个元组序列，values返回的是一个字典序列
<
14
> distinct(): 从返回结果中剔除重复纪录
|