翻译此查询集？

问题描述

我的查询是在MysqL中进行的，我想知道如何将其转换为ORM django，谢谢您

SELECT *,(SELECT count(*)
FROM tesisnueva.donador_desactivar ds
where ds.motivo=1 and
ds.donador_id= dd.id and
date_add(ds.fecha_desactivar,INTERVAL 90 DAY)<Now()) as cantidad
FROM tesisnueva.donador_donador dd 
where dd.genero='F';

我的模型

class Donador(models.Model):
    user = models.OnetoOneField(User,on_delete=models.CASCADE)
    hospital = models.ForeignKey(Hospital,null=True,blank=True,on_delete=models.SET_NULL)
    fecha_nacimiento = models.DateField(validators=[check_date])
    direccion = models.CharField(max_length=50,null=False,blank=False)
    genero = models.CharField( max_length=1,choices = GENERO,default='M')
    grupo_sanguineo = models.CharField(max_length=10,choices=GRUPO_SangrE,default='A')
    factor_RH = models.CharField(max_length=2,choices=FACTOR_SangrE,default='+')
    telefono = models.CharField(max_length=12)
    activo = models.BooleanField(default=0)
    groups = models.ForeignKey(Group,on_delete=models.CASCADE)


class Desactivar(models.Model):
    donador = models.ForeignKey(Donador,on_delete=models.CASCADE)
    motivo= models.IntegerField()
    fecha_desactivar=models.DateField()

解决方法

您可以使用.annotate(…) [Django-doc]并使用filter=… parameter [Django-doc]来相应地过滤相关模型：

    If IO.File.Exists(filePath) Then

        Using outputFile = IO.File.AppendText(filePath)
            outputFile.WriteLine(Strings.Join({intNewNo(intLoop).ToString,txtName.Text,txtSurname.Text,mtbCell.Text,txtEmail.Text},","))
        End Using

        
        MessageBox.Show("Save Successful")
        MessageBox.Show("Add another record","Cancel",MessageBoxButtons.OKCancel,MessageBoxIcon.Information)

        txtName.Clear()
        txtSurname.Clear()
        mtbCell.Clear()
        txtEmail.Clear()
    Else
        MessageBox.Show(filePath,".txt not found.",MessageBoxButtons.RetryCancel,MessageBoxIcon.Information)
    End If

此查询集产生的from datetime import timedelta from django.db.models import Q from django.utils.timezone import now Donador.objects.filter(genero='F').annotate( cantidad=Count( 'desactivar',filter=Q(motivo=1,fecha_desactivar=now()-timedelta(days=90)) ) )对象具有一个额外的属性Donador，其中包含满足给定过滤器的相关.cantidad对象的数量。