Python 如何从 django 模型创建双长文本字段
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How to create double and long text field from django models
提问by Rajeev
How to create a doublefield in mysql using django models. i run into this error and also how to create a longtextdatatype with django
如何double使用 Django 模型在 mysql 中创建一个字段。我遇到了这个错误以及如何longtext使用 django创建数据类型
class Test(models.Model):
maxcount = models.DoubleField(null=True) ## double DEFAULT NULL,
cs = models.TextField()#longtext,
Error:
错误：
maxcount = models.DoubleField(null=True) ##double DEFAULT NULL,
AttributeError: 'module' object has no attribute 'DoubleField'
采纳答案by GrvTyagi
https://docs.djangoproject.com/en/1.8/ref/models/fields/#bigintegerfield
https://docs.djangoproject.com/en/1.8/ref/models/fields/#decimalfield
https://docs.djangoproject.com/en/dev/ref/models/fields/#floatfield
https://docs.djangoproject.com/en/1.8/ref/models/fields/#bigintegerfield
https://docs.djangoproject.com/en/1.8/ref/models/fields/#decimalfield
https://docs。 djangoproject.com/en/dev/ref/models/fields/#floatfield
Use big int in a case when you want an Integer and decimal field.
Use https://docs.djangoproject.com/en/1.8/ref/models/fields/#charfieldfor Char field and set max and min parameters
在需要整数和十进制字段的情况下使用 big int。
使用https://docs.djangoproject.com/en/1.8/ref/models/fields/#charfield作为 Char 字段并设置最大和最小参数
回答by Andrey Grachev
There is no DoubleFieldin Django but FloatField[FloatField description in Django's Model field reference]creates a doubledatatype in mysql.
DoubleFieldDjango中没有，但FloatField[FloatField description in Django's Model field reference]double在 mysql 中创建了一个数据类型。
Django's TextFieldcreates a LONGTEXTtype in mysql. There is no easy way to change TextFieldbehaviour to create e.g. MEDIUMTEXTtype in mysql. But one can create a custom model field to achieve that: Writing custom model fields
Django在 mysql 中TextField创建了一个LONGTEXT类型。没有简单的方法可以更改TextField行为以MEDIUMTEXT在 mysql 中创建例如类型。但是可以创建一个自定义模型字段来实现：编写自定义模型字段
回答by coya
I think you might be needing DecimalField: https://docs.djangoproject.com/en/2.0/ref/models/fields/#decimalfield. It works well with MySQL, and you could also use this for integer values.
我认为您可能需要 DecimalField：https: //docs.djangoproject.com/en/2.0/ref/models/fields/#decimalfield。它适用于 MySQL，您也可以将其用于整数值。
Declare the fields in your models
声明模型中的字段
balance = models.DecimalField(max_digits=20, decimal_places=2, default=Decimal(0.00))
Also, consider defining a decimal context to create your actual values like so:
此外，考虑定义一个十进制上下文来创建您的实际值，如下所示：
# defined in the settings.py file.
DECIMAL_CONTEXT = Context(prec=6, rounding=ROUND_DOWN)
This will ensure compatible decimal objects through your application, and create values like this:
这将确保通过您的应用程序兼容十进制对象，并创建如下值：
DECIMAL_CONTEXT.create_decimal(0)
DECIMAL_CONTEXT.create_decimal(500)
DECIMAL_CONTEXT.create_decimal(5)
DECIMAL_CONTEXT.create_decimal(0.50)
