django中的filter(), all(), get()

时间：2019-06-14 10:53:31 阅读：90 评论：0 收藏：0 [点我收藏+]

标签：inf super djang end models boolean sql语句 cts name

1. 类名.objects中的get(), filter(), all() 的区别

下面定义两个模型类，分别为BookInfo, HeroInfo, BookInfo与HeroInfo为一对多的关系，代码如下：

from django.db import models

class BookInfoManager(models.Manager):
    def get_queryset(self):
        return super(BookInfoManager,self).get_queryset().filter(isDelete=False)
    def create(self, btitle, bpub_date):
        b = BookInfo()
        b.btitle = btitle
        b.bpub_date = bpub_date
        b.bread = 0
        b.bcommet = 0
        b.isDelete = False
        return b

class BookInfo(models.Model):
    btitle = models.CharField(max_length=20)
    bpub_date = models.DateTimeField()
    bread = models.IntegerField(default=0)
    bcommet = models.IntegerField(default=0)
    isDelete = models.BooleanField(default=False)
    class Meta:
        db_table = ‘bookinfo‘  #  此处不定义表名的话，默认表名为应用名+模型类名（小写）
    books1 = models.Manager()
    books2 = BookInfoManager()

class HeroInfo(models.Model):
    hname = models.CharField(max_length=20)
    hgender = models.BooleanField(default=False)
    isDelete = models.BooleanField(default=True)
    hcontent = models.CharField(max_length=100)
    hbook = models.ForeignKey(BookInfo)
    class Meta:
        db_table = ‘heroinfo‘