title: mysql学习笔记
renderNumberedHeading: true
grammar_cjkRuby: true
远程连接
mysql -u root -h **.**.**.** -p
DDL
-create drop alter
DML
-insert delete update
DQL
-select
DCL
创建UTF-8编码数据库
create database django1906 default charset utf8;
注意此处不能在配置/etc/my.cnf添加skp-grant-table否则会创建用户失败
创建mysql用户操作指定表
create user 'django'@'localhost' identified by '123456';
赋予指定权限
grant insert,delete,update,select,create,alter on django1906.* to 'django'@'localhost';
title: python后端Django之models操作
tags: python,Django,models
renderNumberedHeading: true
grammar_cjkRuby: true
-- 创建数据库
create database django1906 default charset utf8;
-- 创建用户
create user 'jackfrued'@'%' identified by '123456';
-- 给用户授权
grant all privileges on django1906.* to 'jackfrued'@'%';
flush privileges;
model创建：
class Subject(models.Model):
"""
学科模型类
"""
no = models.AutoField(primary_key=True)
name = models.CharField(max_length=20)
intro = models.CharField(max_length=1000)
"""
为模型类添加新的附加内容
"""
class Meta:
db_table = 'tb_subject'
setting.py中添加配置
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python manage.py makemigrations polls
python manage.py migrate
创建迁移是需要注意设置默认值或者允许为空
创建管理员平台
python manage.py createsuperuser
http://127.0.0.1:8000/admin
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进入管理员平台后需要在admin.py注册
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之后显示
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localhost:8000/admin中的Subject英文显示可以在Moldel.py中修改模型附加信息如：
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单数形式verbose_name
复数形式verbose_name_plural
由于显示英文可以修改admin.py中的内容
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新建模型对应的admin类继承ModelAdmin类
list_display #需要展示的内容
serch_fileds #可搜索的内容选项
ordering #排序规则与排序优先级
list_display_links #修改字段可以时点击的链接位置
model新增字段时
先添加字段然后---
title: python后端Django之页面views
tags: python,Django,views
renderNumberedHeading: true
grammar_cjkRuby: true
正确建立连接需要三个步骤
第一步在templates中建立相应页面
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第二步在views.py中写请求处理函数
def index(request:HttpRequest):
from polls.models import Subject
query1 = Subject.objects.all()
return render(request, 'index.html', context={
'subjects': query1,
})
def show_teacher(request):
"""
:param request:HttpRequest
:return:
显示指定学科的老师
"""
sno = request.GET['sno']
from polls.models import Subject, Teacher
subject = Subject.objects.get(no=sno)
teachers = Teacher.objects.filter(subject__no=sno)
context = {
'subject': subject,
'teachers': teachers,汉书
}
return render(
request, 'teacher.html', context
)
第三步在Urls.py中添加相应Path
from polls.views import index, show_teacher
urlpatterns = [
path('admin/', admin.site.urls),
path('', index),
path('teachers/', show_teacher),
]
python manage.py makemigrations polls
python manage.py migrate
然后在admin.py中list_display添加is_hot
title: python后端Django之页面views
tags: python,Django,views
renderNumberedHeading: true
grammar_cjkRuby: true
正确建立连接需要三个步骤
第一步在templates中建立相应页面
[图片上传失败...(image-41ba96-1578307857926)]
第二步在views.py中写请求处理函数
def index(request:HttpRequest):
from polls.models import Subject
query1 = Subject.objects.all()
return render(request, 'index.html', context={
'subjects': query1,
})
def show_teacher(request):
"""
:param request:HttpRequest
:return:
显示指定学科的老师
"""
sno = request.GET['sno']
from polls.models import Subject, Teacher
subject = Subject.objects.get(no=sno)
teachers = Teacher.objects.filter(subject__no=sno)
context = {
'subject': subject,
'teachers': teachers,汉书
}
return render(
request, 'teacher.html', context
)
第三步在Urls.py中添加相应Path
from polls.views import index, show_teacher
urlpatterns = [
path('admin/', admin.site.urls),
path('', index),
path('teachers/', show_teacher),
]