Question

我正在尝试对模型中的字段内的子字符串进行不区分大小写的搜索。

我的模特：

class doctor(models.Model):
    docid = models.AutoField(primary_key=True, unique=True) # Need autoincrement, unique and primary
    name = models.CharField(max_length=35)
    username = models.CharField(max_length=15)
    regid = models.CharField(max_length=15, default="", blank=True)
    photo = models.CharField(
        max_length=35, default="", blank=True)
    email = models.EmailField(default="", blank=True)
    phone = models.CharField(max_length=15)
    qualifications = models.CharField(
        max_length=50, default="", blank=True)
    about = models.CharField(
        max_length=35, default="", blank=True)
    specialities = models.CharField(
        max_length=50, default="", blank=True)
    department = models.CharField(max_length=50, default="ENT", blank=True)
    fees = models.FloatField(default=300.0)
    displayfee = models.IntegerField(default=0, blank=True)
    slotrange = models.CharField(max_length=50, blank=True)
    slotdurn = models.IntegerField(default=10)
    breakrange = models.CharField(
        max_length=50, default="", blank=True)
    slotsleft = models.CharField(
        max_length=50, default="", blank=True)
    def __str__(self):
        return self.name
    def Range(self):
        return self.slotrange
    def listslots(self):
        SlotRange = self.slotrange
        SlotDurn = self.slotdurn
        startime = SlotRange.split('-')[0]
        endtime = SlotRange.split('-')[1]
        sthr, stmin = SplitTimeString(startime)
        enhr, enmin = SplitTimeString(endtime)
        print(stamptoday(sthr, stmin))
        print(stamptoday(enhr, enmin))
        startstamp = stamptoday(sthr, stmin)
        endstamp = stamptoday(enhr, enmin)
        secdurn = SlotDurn*60
        slotlist = []
        for sec in range(startstamp, endstamp, secdurn):
            enttime = sec + secdurn
            myrange = ("%s - %s" % (HumanTime(sec),
                                    HumanTime(enttime)))
            slotlist.append(myrange)
        return slotlist

在我的mysql数据库的“名称”字段下，是两行，其名称分别为“ Joel”和“ Jaffy Joel”。

当我这样搜索时：

from appointments.models import customer, doctor, appointment
doctor.objects.filter(name__icontains='joel')

输出：

<QuerySet []>

但是当我这样做时：

doctor.objects.filter(name__icontains='Joel')

输出：

<QuerySet [<doctor: Joel>, <doctor: Jaffy Joel>]>

不区分大小写的搜索为什么不适合小写搜索？

Answer 1

如django docs中所指出，

在MySQL中，数据库表的“排序规则”设置确定是否精确比较区分大小写。这是数据库设置，不是 Django设置。可以配置您的MySQL表以使用区分大小写的比较，但需要权衡取舍。欲了解更多有关此信息，请参见数据库中的排序规则部分文档。

就我而言，我用

解决了

from django.db.models import Q,CharField
from django.db.models.functions import Lower
CharField.register_lookup(Lower, "lower")
doctor.objects.filter(Q(name__lower__contains='joel'))

这方面的提示是django用户邮件列表中的Matthew Pava提供的。

Django中不区分大小写的搜索

1 个答案: