django模型里的meta是什么意思

引用sof上的一个回答。class Test(models.Model): charNull = models.CharField(max_length=10, null=True) charBlank = models.CharField(max_length=10, blank=True) charNullBlank = models.CharField(max_length=10, null=True, blank=True)intNull = models.IntegerField(null=True)intBlank = models.IntegerField(blank=True)intNullBlank = models.IntegerField(null=True, blank=True)dateNull = models.DateTimeField(null=True)dateBlank = models.DateTimeField(blank=True)dateNullBlank = models.DateTimeField(null=True, blank=True) The database fields created for MySQL 5.6.x are :CREATE TABLE test (id INT(11) NOT NULL AUTO_INCREMENT,charNull VARCHAR(10) NULL DEFAULT NULL, charBlank VARCHAR(10) NOT NULL, charNullBlank VARCHAR(10) NULL DEFAULT NULL, intNull INT(11) NULL DEFAULT NULL, intBlank INT(11) NOT NULL, intNullBlank INT(11) NULL DEFAULT NULL, dateNull DATETIME NULL DEFAULT NULL, dateBlank DATETIME NOT NULL, dateNullBlank DATETIME NULL DEFAULT NULL)只是从数据库层面来说。