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Models

A model is the single, definitive source of information about your data. It contains the essential fields and behaviors of the data you‘re storing. Generally, each model maps to a single database table.

The basics:

• Each model is a Python class that subclasses?django.db.models.Model.
• Each attribute of the model represents a database field.
• With all of this, Django gives you an automatically-generated database-access API; see?Making queries.

  ?

  Quick example

  Using models

  Fields

  Field types

  Field options

  null

  blank

  choices

  default

  help_text

  primary_key

  unique

  Automatic primary key fields

  Verbose field names

  Relationships

  Many-to-one relationships

  Many-to-many relationships

  Extra fields on many-to-many relationships

  One-to-one relationships

  Models across files

  Field name restrictions

  Custom field types

  Meta options

  Model methods

  Overriding predefined model methods

  Overriding predefined model methods

  Executing custom SQL

  Model inheritance

  Abstract base classes

  Meta?inheritance

  Be careful with?related_name

  Multi-table inheritance

  Meta?and multi-table inheritance

  Proxy models

  Base class restrictions

  Multiple inheritance

  Field name "hiding" is not permitted

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原文地址：http://www.cnblogs.com/MrWho/p/3886059.html