Question

我想用[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列表可以按中文拼音排序，是否可以？

DB：mysql，样本类是打击的（表commoninfo：utf8_general_ci的字符集）：

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中尝试了以下两种方法，但两种方法都不起作用

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：无法解析关键字＆＃39; CONVERT（名称使用gbk）＆＃39;成领域。选项包括：commoninfo_ptr，commoninfo_ptr_id，first_name，id， last_name，name，profile，Check fields / fieldsets / exclude属性 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：

Answer 2

您可以使用extra

queryset.extra(
    select={'convert_name': 'convert(name using gbk)'}, 
    order_by=['convert_name']
)

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

2 个答案: