65.ORM查询条件：gte,gt,lte,lt的使用

1. gte: 代表的是大于等于，英文全称为：great than equal。举例：找到文章id大于等于3等文章，示例代码如下：

定义模型的示例代码如下：

from django.db import modelsclass Category(models.Model):name = models.CharField(max_length=100)class Meta:db_table = 'category'class Article(models.Model):title = models.CharField(max_length=100)content = models.TextField()category = models.ForeignKey('Category', on_delete=models.CASCADE, null=True)def __str__(self):return "<(Article: id: %s,title: %s, content: %s)>" % (self.id, self.title, self.content)class Meta:db_table = 'article'

views.py文件中视图函数的示例代码如下：

from .models import Article, Category
from django.http import HttpResponsedef index(request):# gte:查找出文章id大于等于3的文章articles = Article.objects.filter(id__gte=3)print(articles)print(articles.query)return HttpResponse("success")

打印出结果：

<QuerySet [<Article: <(Article: id: 3,title: 钢铁是怎样炼成的, content: 你好)>>,
<Article: <(Article: id: 4,title: 中国吸引力, content: 精彩极了)>>]>
原生sql语句为：SELECT article.id, article.title, article.content, article.category_id FROM article WHERE article.id >= 3

2. gt:代表的是大于等于。举例查找id大于3的文章，示例代码如下：

from .models import Article, Category
from django.http import HttpResponsedef index(request):articles = Article.objects.filter(id__gt=3)print(articles)print(articles.query)return HttpResponse("success")

打印出结果：

<QuerySet [<Article: <(Article: id: 4,title: 中国吸引力, content: 精彩极了
)>>]>
原生sql语句：SELECT article.id, article.title, article.content, article.category_id FROM article WHERE article.id > 3

3.lte: 代表的是小于等于，举例查找id小于等于3的文章，示例代码如下：

from .models import Article, Category
from django.http import HttpResponsedef index(request):articles = Article.objects.filter(id__lte=3)print(articles)print(articles.query)return HttpResponse("success")

打印出结果：

<QuerySet [<Article: <(Article: id: 1,title: Hello, content: 你好)>>,
<Article: <(Article: id: 2,title: Hello World, content: 大家好)>>,
<Article: <(Article: id: 3,title: 钢铁是怎样炼成的, content: 你好)>>]>
SELECT article.id, article.title, article.content, article.category_id FROM article WHERE article.id <= 3

4.lt: 代表的是小于。举例查找id小于3的文章。示例代码如下：

from .models import Article, Category
from django.http import HttpResponsedef index(request):articles = Article.objects.filter(id__lt=3)print(articles)print(articles.query)return HttpResponse("success")

打印出结果：

<QuerySet [<Article: <(Article: id: 1,title: Hello, content: 你好)>>, <Article: <(Article: id: 2,title: Hello World, content: 大家好)>>]>
SELECT article.id, article.title, article.content, article.category_id FROM article WHERE article.id < 3