django之概述

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1.创建model，

2.然后再setting里面加入这个app，即激活模型

3.然后用命令：manage.py validate确认model是否有错误，

4.python manage.py makemigrations polls,建表，迁移文件，

5.python manage.py sqlmigrate book 0001用来运行步骤4的迁移文件，把django所要做的事情打印到屏幕上，并不改变数据库表，也可以运行python manage.py check命令；它能在你没有执行迁移或者没有接触到数据库时，检查你的项目中是否存在问题。

6.python manage.py migrate:运行migrate命令，在你的数据库中创建模型所对应的数据表：

步骤5生成的结果如下：

BEGIN;
CREATE TABLE "book_author" (

"id" integer NOT NULL PRIMARY KEY AUTOINCREMENT,

"first_name" varchar(30) NOT NULL,

"last_name" varchar(40) NOT NULL,

 "email" varchar(75) NOT NULL);

CREATE TABLE "book_book" (

"id" integer NOT NULL PRIMARY KEY AUTOINCREMENT,

"title" varchar(100) NOT NULL,

 "publication_date" date NOT NULL);

CREATE TABLE "book_book_authors" (

"id" integer NOT NULL PRIMARY KEY AUTOINCREMENT,

 "book_id" integer NOT NULL REFERENCES

 "book_book" ("id"),

 "author_id" integerNOT NULL REFERENCES

 "book_author" ("id"),

 UNIQUE ("book_id", "author_id"));

CREATE TABLE "book_publisher" (

"id" integer NOT NULL PRIMARY KEY AUTOINCREMENT,
"name" varchar(30) NOT NULL,

 "address" varchar(50) NOT NULL,

 "city" varchar(60)NOT NULL,

 "state_province" varchar(30) NOT NULL,

"country" varchar(50) NOT NULL,
 "website" varchar(200) NOT NULL);

CREATE TABLE "book_book__new" (

"id" integer NOT NULL PRIMARY KEY AUTOINCREMENT,
"title" varchar(100) NOT NULL,

"publication_date" date NOT NULL,

 "publisher_id"integer NOT NULL REFERENCES

"book_publisher" ("id"));

INSERT INTO "book_book__new" ("publication_date", "publisher_id", "id", "title")
 SELECT "publication_date", NULL, "id", "title" FROM "book_book";
DROP TABLE "book_book";
ALTER TABLE "book_book__new" RENAME TO "book_book";
CREATE INDEX "book_book_2604cbea" ON "book_book" ("publisher_id");

django之概述

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原文地址：http://my.oschina.net/yusi/blog/399076