django modifies mysql data

Solutions for Django to modify mysql data: 1. Django establishes a database model; 2. Modify mysql data through the statement "user = User.objects.get(id=9) #user.username = '1234'" ; 3. Save the changes.

Recommended: "mysql video tutorial"

Django's addition, deletion, modification and query of mysql database,

Django mysql automatically generates table commands

#Establish mapping

python manage.py makemigrations

#Into database

python manage.py migrate

django allows external ip to access services

python manage.py runserver 0.0.0.0:8000

Django creates database Model

from django.db import models
class Table_Test(models.Model):
    id = models.IntegerField(primary_key=True)
    name = models.CharField(max_length=200)
    class Meta:
        db_table = "test"

Common sql operations

#入库操作（增）
#建立实例
#user = User(username='新用户',password='你好')
#入库操作
#user.save()
#删除数据（删）
#User.objects.filter(username='新用户').delete()
#修改数据(改) 第一种方式
#user = User.objects.get(id=9)
#修改字段
#user.username = '1234'
#保存修改
#user.save()
#修改数据（改） 第二种方式
#return HttpResponse('',status=403)
#User.objects.filter(id=9).update(password='新密码')
#查询全部数据 翻译为 select * from user; all()返回值是list
res = User.objects.all()
#print(res)
#查询限定条件的数据 翻译为 select * from user where username = '新用户123' and逻辑使用多个参数传递
res = User.objects.filter(username='新用户',password='你好')
#print(res)
#只取一条 翻译 select * from user where id = 1
res_one = User.objects.get(id=1)
#print(res_one)
#排除条件  翻译为 select * from user where username != &#39;新用户123&#39;   <>
res = User.objects.exclude(username=&#39;新用户&#39;)
#定制字段显示 翻译为 select password from user where name = &#39;新用户&#39;
res_s = User.objects.filter(username=&#39;新用户&#39;).values(&#39;password&#39;)
#排序 翻译为 select * from user order by id asc  倒序使用 reverse()
res = User.objects.filter(username=&#39;新用户&#39;).order_by("password").reverse()
#去重 翻译为 select distinct(username) from user where username = &#39;新用户&#39;
res_dis = User.objects.filter(username=&#39;新用户&#39;).values(&#39;username&#39;).distinct()
#print(res_dis)
#取数量 翻译为 select count(*) from user
res_count = User.objects.filter(username=&#39;新用户&#39;).count()
print(res_count)

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