一对多
from django.db import models
# Create your models here.
class Project(models.Model):
project_name = models.CharField(max_length=32,verbose_name="项目名称")
project_describe = models.CharField(max_length=100,verbose_name="描述")
project_create_date = models.DateTimeField(verbose_name="创建时间")
class Meta:
db_table = 'db_project' # 给表定义表名
class Clas(models.Model):
SEX_CHOICES = (
(0, "API"),
(1, "WEBUI"),
(2, "APPUI"),
)
cla_name = models.CharField(db_column="class_name",max_length=32,unique=True,verbose_name="姓名")
cla_describe = models.CharField(db_column="class_describe",max_length=100,verbose_name="描述")
cla_create_date = models.DateTimeField(db_column="class_create_date",verbose_name="创建时间")
# 一对多 要将关联放在多的模型里面
# db_column给字短定义名称 on_delete删除模式# db_constraint限制 下面这一行 他会在表中创建一个字短 “class_id”
clas = models.ForeignKey(db_column="class_id",to="Project",on_delete=models.CASCADE,db_constraint=False)
class Meta:
db_table = 'db_class'
一对一
from django.db import models
# Create your models here.
class Project(models.Model):
project_name = models.CharField(max_length=32,verbose_name="项目名称")
class Clas(models.Model):
cla_name = models.CharField(db_column="class_name",max_length=32,unique=True,verbose_name="姓名")
# 一对一
stu_detail = models.OneToOneField("StudentDetail",on_delete=models.CASCADE)
多对多
from django.db import models
# Create your models here.
class Project(models.Model):
project_name = models.CharField(max_length=32,verbose_name="项目名称")
class Clas(models.Model):
cla_name = models.CharField(db_column="class_name",max_length=32,unique=True,verbose_name="姓名")
# 多对多 关联 放在两个模型里面哪个都可以 她会生成第三张表 默认表明是 类名_字段名 Clas_p 自定义表名 使用 db_table
p = models.ManyToManyField("要关联的模型类名称",db_table="第三张表名")
class Meta:
db_table = 'db_class'
