django学习笔记之models

djang models

1. 创建model

from django.db import models

class MyObject(models.Model):

attribute1 = models.CharField(max_length=50)

2. 创建记录

2.1  p = MyObject(attribute=xxxx)

p.save()

2.2  p = MyObject.objects.create(attribue=xxx)

3. 更新记录

p = MyObject.objects.all(attribute=xxx)

p.attribute = yyy

p.save()

4. 检索记录

MyObject.objects.all()

5. 过滤记录

MyObject.objects.filter(attribute=‘xxxx‘,....)

MyObject.objects.filter(attribute__contains = ‘xxxx‘)

MyObject.objects.filter(attribute__icontains=‘xcada‘)

MyObject.objects.filter(attribute__statswith=xxx)

MyObject.objects.filter(attribute__endswith=dadadad)

6. 单一检索

MyObject.objects.get(attribute=xxx)

注意：

6.1 如果返回多条记录，则抛出错误

6.2 返回为空也会报错

7. 排序

MyObject.objects.order_by(‘xxx‘, ....)

MyObject.objects.order-by(‘-xxxx‘)

8. 默认排序

class MyObjects（models.Model):

attribute = models.CharField(max_lenth=2222)

--------------------------------------------

class Meta:

ordering = [‘name‘]

9. 复合查询

django学习笔记之models