建立 model

• models.py

#coding=utf-8
from django.db import models

class UserMessage(models.Model):
    name = models.CharField(max_length=20, verbose_name="使用者名稱")
    email = models.EmailField(verbose_name="郵箱")
    address = models.CharField(max_length=100, verbose_name="聯絡地址")
    message = models.CharField(max_length=500
 
, verbose_name="留言資訊")

    class Meta:
        verbose_name = "使用者留言資訊"

verbose_name 理解為對欄位的註釋

• 關於 Meta 類的一點解釋

使用內部的class Meta 定義模型的元資料

Options.verbose_name
A human-readable name for the object, singular:>
verbose_name = "pizza"
If this isn’t given, Django will use a munged version of the class name: CamelCase becomes camel case.

• 參考資料：

在資料庫中生成剛建立的 model

• 執行migrate message命令:

• 報錯，在settings.py中進行註冊：

• 再 migrate 一次：

• 使用 Navicat 檢視一下：

Djang 常用欄位型別

CharField 必須要有 max_length 引數

• 新增主鍵：

• 重新遷移一下：

• 檢查一下資料庫：

Meta 類中的其他一些內容

Options.db_table
The name of the database table to use for the model:

db_table = 'music_album'

Options.ordering The default ordering for the object, for use when obtaining lists of objects:

ordering = ['-order_date'] This is a tuple or list of strings. Each
string is a field name with an optional “-” prefix, which indicates
descending order. Fields without a leading “-” will be ordered
ascending. Use the string”?” to order randomly.

For example, to order by a pub_date field ascending, use this:

ordering = ['pub_date'] To order by pub_date descending, use this:

ordering = ['-pub_date']

Options.verbose_name_plural
The plural name for the object:
verbose_name_plural = "stories"
If this isn’t given, Django will use verbose_name + “s”.