修改model.py的內容之後執行下面的命令:
python manger.py makemigrations
相當於 在該app下建立 migrations目錄,並記錄下你所有的關於modes.py的改動,比如0001_initial.py, 但是這個改動還沒有作用到數據庫文件
你可以手動打開這個文件,看看裏面是什麼
在此之後執行命令
python manager.py migrate
將該改動作用到數據庫文件,比如產生table之類
當makemigrations之後產生了0001_initial.py 文件,可以查看下該migrations會對應於什麼樣子的SQL命令
python manger.py sqlmigrate theapp 0001
大概是這個樣子的:
BEGIN;CREATE TABLE "polls_choice" ( "id" serial NOT NULL PRIMARY KEY, "choice_text" varchar(200) NOT NULL, "votes" integer NOT NULL);CREATE TABLE "polls_question" ( "id" serial NOT NULL PRIMARY KEY, "question_text" varchar(200) NOT NULL, "pub_date" timestamp with time zone NOT NULL);ALTER TABLE "polls_choice" ADD COLUMN "question_id" integer NOT NULL;ALTER TABLE "polls_choice" ALTER COLUMN "question_id" DROP DEFAULT;CREATE INDEX "polls_choice_7aa0f6ee" ON "polls_choice" ("question_id");ALTER TABLE "polls_choice" ADD CONSTRAINT "polls_choice_question_id_246c99a640fbbd72_fk_polls_question_id" FOREIGN KEY ("question_id") REFERENCES "polls_question" ("id") DEFERRABLE INITIALLY DEFERRED;COMMIT;