django使用orm實現條件搜尋和模糊匹配

2. 模糊匹配

使用條件搜尋時，可以直接使用filter鏈來過濾掉滿足條件的記錄，因為每次filter()的結果仍然是乙個queryset,因此可以根據引數有無，來新增filter。

先不新增任何搜尋條件獲取乙個queryset。

invoice_heads = invoicehead.objects.
filter
(                resource_uid=resource_uid,
status=
"y",
user_id=user_id,
)

if invoice_type is
notnone
:		invoice_heads = invoice_heads.
filter
(invoice_type=invoice_type)

大於等於__gte, 小於等於__lte。

if end_date is
notnone
:                invoice_heads = invoice_heads.
filter
(invoice_date__lte=end_date)

將每個需要搜尋的字段先判斷一下是不是none,如果不是none,那麼就在queryset後面在拼接.filter() ,實現條件搜尋過濾。

class
openedinvoicequery
(baseview)
:def
get(self, request, resource_uid=
none):
r = result(
)        using = self.get_partner(request)
try:
student = self.student_auth(request)
user_id = student[
'id'
]            invoice_type = request.get.get(
"invoice_type"
)            invoice_code = request.get.get(
"invoice_code"
)            invoice_no = request.get.get(
"invoice_no"
)            start_date = request.get.get(
"start_date"
)            end_date = request.get.get(
"end_date"
)            invoice_status = request.get.get(
"invoice_status",0
)            size =
int(request.get.get(
"size",10
))page =
int(request.get.get(
"page",0
))invoice_heads = invoicehead.objects.
filter
(                resource_uid=resource_uid,
status=
"y",
user_id=user_id,
)if invoice_type is
notnone
:                invoice_heads = invoice_heads.
filter
(invoice_type=invoice_type)
if invoice_code is
notnone
:                invoice_heads = invoice_heads.
filter
(invoice_code=invoice_code)
if invoice_no is
notnone
:                invoice_heads = invoice_heads.
filter
(invoice_no=invoice_no)
if invoice_status is
notnone
:                invoice_heads = invoice_heads.
filter
(red_flag=invoice_status)
if start_date is
notnone
:                invoice_heads = invoice_heads.
filter
(invoice_date__gte=start_date)
if end_date is
notnone
:                invoice_heads = invoice_heads.
filter
(invoice_date__lte=end_date)
r.data_count =
len(invoice_heads)
page_obj = paginator(invoice_heads, size)
page_data = page_obj.get_page(page)
res = page_data.object_list
data =
for i in res:
d = invoiceheadserializers(i)
.data
line = invoiceline.objects.
filter
(head=i)
.first(
)                d[
"main_goods_name"
]= line.goods_name
d["total_price_with_tax"
]= i.amount + i.total_amount
r.data = data
except exception as e:
r.error(e)
return self.s_result(r)

在django的orm中，可以使用__icontains 來表示mysql裡的like 「%%」

匹配code,key,goods_name,******_name:

from django.db.models import q  
row = invoiceproductcategories.objects.using(
"admin"
) \            .
filter
(~q(rate1=
none),
goods_name__icontains=goods_name,
******_name__icontains=******_name,
code__icontains=code,
key__icontains=key)

不等於使用~q，在預設的不等於none中，需要把~q放到filter()的最前面，要不然會編譯不通過。

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