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  • Django创建第一个应用

    一.创建第一个应用,并在settings.py中添加。

    python manage.py startapp article

    二.创建第一个模型

    class Article(models.Model):
        title = models.CharField(max_length=200)
        body = models.TextField()
        pub_date = models.DateTimeField('date published')
        likes = models.IntegerField()
    
        def __unicode__(self):
            return self.title

    Field Types 和 Field Options:

    >>> import re                  #右边为手动添加非代码部分
    >>> for fieldtype in dir(models):
    ...     if re.search('Field', fieldtype):
    ...         print fieldtype
    ...                   #对应默认的HTML         #特有的选项
    AutoField                                                    
    BigIntegerField
    BooleanField
    CharField               <input type='text' ...>    max_length必须指定
    CommaSeparatedIntegerField
    DateField
    DateTimeField            <input type='text' ...>
    DecimalField
    EmailField
    Field
    FieldDoesNotExist
    FileField
    FilePathField
    FloatField
    GenericIPAddressField
    IPAddressField
    ImageField
    IntegerField              <input type='text' ...>
    ManyToManyField
    NullBooleanField
    OneToOneField
    PositiveIntegerField
    PositiveSmallIntegerField
    SlugField
    SmallIntegerField
    TextField               <textarea>...</textarea>
    TimeField
    URLField

    Field Options公共选项:

    • null:If True, Django will store empty values as NULL in the database. Default is False.
    • blank:If True, the field is allowed to be blank. Default is False.
    • primary_key:If True, this field is the primary key for the model.
    • unique:If True, this field must be unique throughout the table.
    • default:The default value for the field. This can be a value or a callable object. If callable it will be called every time a new object is created.
    • choices:An iterable (e.g., a list or tuple) of 2-tuples to use as choices for this field. If this is given, the default form widget will be a select box instead of the standard text field and will limit choices to the choices given.
    • ...

    Model Methods:

    __unicode__():

    >>> from article.models import Article
    >>> Article.objects.all()
    [<Article: test 1>, <Article: test 2>, <Article: test 3>, <Article: TestTitle>, <Article: FileTest>]
    >>> 

    详细请看:https://docs.djangoproject.com/en/1.5/ref/models/fields/

    三.同步到后台,创建数据库表

    yang@mint-linux ~/Documents/sinaapp/yangqiong/1 $ python manage.py sql article
    BEGIN;
    CREATE TABLE `article_article` (
        `id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY,
        `title` varchar(200) NOT NULL,
        `body` longtext NOT NULL,
        `pub_date` datetime NOT NULL,
        `likes` integer NOT NULL
    )
    ;
    
    COMMIT;
    yang@mint-linux ~/Documents/sinaapp/yangqiong/1 $ python manage.py syncdb
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  • 原文地址:https://www.cnblogs.com/yangqionggo/p/3297633.html
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