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django -- verbose_name的对数据库层面的影响

2017-11-29 14:09 281 查看

一、没有verbose_name时model的定义：

from django.db import models

# Create your models here.

class Question(models.Model):
question_text = models.CharField(max_length=128)

class Answer(models.Model):
question = models.ForeignKey(Question)
answer_text = models.CharField(max_length=128)

二、对应的SQL：

BEGIN;
--
-- Create model Answer
--
CREATE TABLE "polls_answer" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "answer_text" varchar(128) NOT NULL);
--
-- Create model Question
--
CREATE TABLE "polls_question" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "question_text" varchar(128) NOT NULL);
--
-- Add field question to answer
--
ALTER TABLE "polls_answer" RENAME TO "polls_answer__old";
CREATE TABLE "polls_answer" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "answer_text" varchar(128) NOT NULL, "question_id" integer NOT NULL REFERENCES "polls_question" ("id"));
INSERT INTO "polls_answer" ("id", "answer_text", "question_id") SELECT "id", "answer_text", NULL FROM "polls_answer__old";
DROP TABLE "polls_answer__old";
CREATE INDEX "polls_answer_question_id_d45b3e6d" ON "polls_answer" ("question_id");
COMMIT;

三、带有verbose_name的model定义：

from django.db import models

# Create your models here.

class Question(models.Model):
question_text = models.CharField(max_length=128)

class Answer(models.Model):
question = models.ForeignKey(Question,verbose_name="related question id")
answer_text = models.CharField(max_length=128)

四、对应SQL层的代码：

BEGIN;
--
-- Create model Answer
--
CREATE TABLE "polls_answer" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "answer_text" varchar(128) NOT NULL);
--
-- Create model Question
--
CREATE TABLE "polls_question" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "question_text" varchar(128) NOT NULL);
--
-- Add field question to answer
--
ALTER TABLE "polls_answer" RENAME TO "polls_answer__old";
CREATE TABLE "polls_answer" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "answer_text" varchar(128) NOT NULL, "question_id" integer NOT NULL REFERENCES "polls_question" ("id"));
INSERT INTO "polls_answer" ("id", "answer_text", "question_id") SELECT "id", "answer_text", NULL FROM "polls_answer__old";
DROP TABLE "polls_answer__old";
CREATE INDEX "polls_answer_question_id_d45b3e6d" ON "polls_answer" ("question_id");
COMMIT;

五、总结：

　　由上面的两组代码可以看出verbose_name 在SQL层面没有具体的体现、也就是说加不加verbose_name

　　对数据库层面没影响。

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