在django操作數(shù)據(jù)庫的時(shí)候如何找出內(nèi)容不為空的數(shù)據(jù)呢？

from django.db.models import Q class Index(VIew): def get(self, request): userObj = models.Asset.objects.filter(~Q(asset_id = ’’) return HttpResponse(’yes’)

上面代碼中的models.Asset.objects.filter(~Q(nick = ’’)則是使用Q函數(shù)去找出nick不為空的數(shù)據(jù)，主要使用~Q

補(bǔ)充知識(shí)：Django報(bào)錯(cuò) HINT: Add or change a related_name argument to the definition for ’GodownentryReturn.suppl

Unhandled exception in thread started by <function wrapper at 0x05569030>Traceback (most recent call last):File “G:workspacepycharmcarwincarwin_envlibsite-packagesdjangoutilsautoreload.py”, line 226, in wrapperfn(*args, **kwargs)File “G:workspacepycharmcarwincarwin_envlibsite-packagesdjangocoremanagementcommandsrunserver.py”, line 116, in inner_runself.check(display_num_errors=True)File “G:workspacepycharmcarwincarwin_envlibsite-packagesdjangocoremanagementbase.py”, line 472, in checkraise SystemCheckError(msg)django.core.management.base.SystemCheckError: SystemCheckError: System check identified some issues:

ERRORS:

article.GodownentryReturn.supplier: (fields.E304) Reverse accessor for ‘GodownentryReturn.supplier’ clashes with reverse accessor for ‘GodownentryReturn.supplier’.

HINT: Add or change a related_name argument to the definition for ‘GodownentryReturn.supplier’ or ‘GodownentryReturn.supplier’.

part.GodownentryReturn.supplier: (fields.E304) Reverse accessor for ‘GodownentryReturn.supplier’ clashes with reverse accessor for ‘GodownentryReturn.supplier’.

HINT: Add or change a related_name argument to the definition for ‘GodownentryReturn.supplier’ or ‘GodownentryReturn.supplier’.

原因：

因?yàn)樵谝粋€(gè)表中多次引用某個(gè)外鍵表，而且沒有指定唯一的releated_name，而導(dǎo)致的。

解決方案：

將同一個(gè)表中外鍵，增加不同的releated_name。

以上這篇Django中ORM找出內(nèi)容不為空的數(shù)據(jù)實(shí)例就是小編分享給大家的全部?jī)?nèi)容了，希望能給大家一個(gè)參考，也希望大家多多支持好吧啦網(wǎng)。