mysql - Django，如何使用 [ORDER BY CONVERT (name USING gbk) ASC] 进行查询

Question

我想使用 [ORDER BY CONVERT (name USING gbk) ASC] 进行查询，以便管理员更改/添加表单中的 foreignkey 列表可以按以下方式排序汉语拼音，可能吗？

数据库:mysql，示例类如下(表commoninfo的字符集:utf8_general_ci):

class CommonInfo(models.Model):
    name = models.CharField(max_length=128)
    def __str__(self):
        return self.name

class Personal(CommonInfo):
    first_name = models.CharField(max_length=128,null=True, blank=True, default = None)
    last_name = models.CharField(max_length=128,null=True, blank=True, default = None)

class Profile(models.Model):
    personal_info = models.ForeignKey(Personal, null=True, blank=True, default = None)
    mobile = models.CharField(max_length=32,default='',null=True, blank=True)

我在 ProfileAdmin 中尝试了以下 2 种方法，但都不起作用

def formfield_for_foreignkey(self, db_field, request, **kwargs):
    if db_field.name == "personal_info":    

        #raw_sql = 'SELECT id as commoninfo_ptr_id, name FROM share_commoninfo ORDER BY CONVERT (name USING gbk) ASC'
        #raw_querySet = Personal.objects.raw(raw_sql) 
        #kwargs["queryset"] = raw_querySet

        querySet = Personal.objects.extra(order_by=['CONVERT (name USING gbk)'])
        kwargs["queryset"] = querySet

        return super(ProfileAdmin, self).formfield_for_foreignkey(db_field, request, **kwargs)

admin.site.register(models.Profile, ProfileAdmin)

FieldError: Cannot resolve keyword 'CONVERT (name USING gbk)' into field. Choices are: commoninfo_ptr, commoninfo_ptr_id, first_name, id, last_name, name, profile, Check fields/fieldsets/exclude attributes of class ProfileAdmin.

Answer 1

from django.db.models import Func, Value

class Convert(Func):
    def __init__(self, expression, transcoding_name, **extra):
         super(Convert, self).__init__(
             expression, transcoding_name=Value(transcoding_name), **extra)

    def as_mysql(self, compiler, connection):
        self.function = 'CONVERT'
        self.template = '%(function)s(%(expressions)s AS %(transcoding_name)s)'
        return super(Conver, self).as_sql(compiler, connection)

用法:

queryset.order_by(Convert('name', 'gbk').asc())

文档:

• Func() expressions
• Examples of database functions