Dango models and database----relation ship

One, the Django self-contained ORM can define the relationship between tables and tables, and now compare the implementation of the database-side between the various relationships

1. ForeignKey Relationship

 from Import Models # Create your models here. class User (models. Model):    name=models. Charfield (max_length=30)    phonenumber=models. Bigintegerfield ()class  Blog (models. Model):    user=models. ForeignKey (User)    blogname=models. Charfield (max_length=16)    content=models. TextField ()#

CREATE TABLE' Sitea_user ' (' ID ')int( One) not NULLauto_increment, ' name 'varchar( -) not NULL, ' PhoneNumber 'bigint( -) not NULL,  PRIMARY KEY(' id ')) ENGINE=InnoDBDEFAULTCHARSET=UTF8;CREATE TABLE' Sitea_blog ' (' ID ')int( One) not NULLauto_increment, ' Blogname 'varchar( -) not NULL, ' content ' Longtext not NULL,  `user_id`int( One) not NULL,  PRIMARY KEY(' id '),KEY' Sitea_blog_user_id_2c1e69b4_fk_sitea_user_id ' ('user_id`),  CONSTRAINT' sitea_blog_user_id_2c1e69b4_fk_sitea_user_id 'FOREIGN KEY(`user_id`)REFERENCES' Sitea_user ' (' ID ')) ENGINE=InnoDBDEFAULTCHARSET=UTF8;

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Dango models and database----relation ship