自定义查询对象
1、声明类EntryManager，继承自models.Manger
在EntryManager中添加自定义函数
class EntryManager(models.Manager):
def 函数名（self,自定义参数列表）
...
return ............
2、使用 EntryManager覆盖models类中的objects
class Entry(models.Model):
objects=EntryManager()
详细解决方案
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