django之数据模型类的字段分析

一：表一的字段分析

class Sheep_Area(models.Model):
# models.AutoField()自增列，要显示自定义的自增列，必须定义primary=True
# area_id 这个是在数据库中存的名字，对应在浏览器显示的名字为verbose_name，这样方便阅读。
    area_id = models.AutoField(primary_key=True, verbose_name='牧场编号')
# models.CharField（）字符串字段，必须需要设置max_length，对应数据库中的 varchar(50),允许为空。
    province = models.CharField(max_length=50,verbose_name='省份',null=True)
    city = models.CharField(max_length=100,verbose_name='市',null=True)
    district = models.CharField(max_length=50,verbose_name='区',null=True)
    county = models.CharField(max_length=100,verbose_name='县',null=True)
    town = models.CharField(max_length=100,verbose_name='乡镇',null=True)
# models.BooleanField() 布尔类型，默认值是False
    isdelete = models.BooleanField(default=False, verbose_name='逻辑删除')
    class Meta:
        db_table = 'sheep_area'  # 数据库中的表名
# class Meta 是一个类中嵌套的抽象类，主要目的是给基类Sheep_Area提供其他的信息，基类就负责表字段的设计
db_table 就是指明基类创建表的表名，如果不指定表名，默认是 sheep_sheep_area，小写app应用名_小写模型类名

二：表二的字段分析

class Sheep_Farm(models.Model):
    farm_id = models.AutoField(primary_key=True, verbose_name='牧场编号')
    farm_name = models.CharField(max_length=100, verbose_name='牧场名称')
    address = models.CharField(max_length=300, verbose_name='牧场地址')
    username = models.CharField(max_length=100, verbose_name='用户名', null=True)
    phone = models.CharField(max_length=20, verbose_name='联系电话', null=True)
    user_id = models.IntegerField(verbose_name='用户ID')
# blank=True 针对表单的，表示表单填写字段的时候，可以为空，否则必须有值，null=True是针对数据库的。
    create_date = models.DateField(default=datetime.date.strftime(datetime.date.today(), "%Y-%m-%d"),verbose_name='创建日期', blank=True)
    # area = models.ForeignKey(to='Sheep_Area', on_delete=models.CASCADE,null=True)
    isdelete = models.BooleanField(default=False, verbose_name='逻辑删除')
# 外键的理解：https://blog.csdn.net/hpu_yly_bj/article/details/78939748
    class Meta:
        db_table = 'sheep_farm'

三：表三的字段分析

class Sheep_Fold(models.Model):
    # 羊舍类型
# choice选择字段:用于页面上的选择框标签，需要先提供一个二维的二元元组，第一个元素表示存在数据库内真实的值，第二个表示页面上显示的具体内容
    fold_choice = (
        ('', '育肥羊舍'),
        ('', '泌乳羊舍'),
        ('', '羔羊舍'),
        ('', '后备羊舍'),
        ('', '种公羊舍'),
        ('', '青年母羊舍'),
        ('', '成年母羊舍'),
        ('', '基本母羊舍'),
        ('', '待产羊舍'),
        ('', '隔离舍')
    )
    f_id = models.AutoField(primary_key=True, verbose_name='羊圈号')
    f_name = models.CharField(max_length=50, null=True, verbose_name='羊圈名字')
    f_type = models.CharField(max_length=10, choices=fold_choice, verbose_name='羊圈的类型')
# models.ForeignKey()，外键设置，关联了Sheep_Farm,表明了一对多的关系，Sheep_Farm是一，Sheep_Fold是多
# on_delete=models.CASCADE 表示层级删除，表示删除主表的数据后从表的数据也会删除。on_delete=models.SET_NULL 表示主表删除这条记录，从表将数据置空
    farm = models.ForeignKey(to='Sheep_Farm', on_delete=models.CASCADE)
    isdelete = models.BooleanField(default=False, verbose_name='逻辑删除')

    class Meta:
        db_table = 'sheep_fold'

四：表四的字段分析

# 羊信息模型
class Sheep_Info(models.Model):
    # 羊品种类型
    type_choice = (
        ('', '萨能奶山羊 '),
        ('', '关中奶山羊'),
        ('', '其他')
    )
    # 性别
    sex_choice = (
        ('', '公'),
        ('', '母')
    )
    # 级别
    grade_choice = (
        ('', '特级'),
        ('', '一级'),
        ('', '二级')
    )
    status_choice = (
        ('','在场'),
        ('','活淘'),
        ('','死亡')
    )

    # 羊的ID
    s_id = models.AutoField(primary_key=True, verbose_name='羊ID号')
    # 羊编号/耳号
    sheep_number = models.IntegerField(null=False, verbose_name='羊编号/耳号')
    # 设备号
    equipment_number = models.CharField(max_length=20, verbose_name='设备号', null=True)
    # 羊品种
    sheep_type = models.CharField(max_length=3, choices=type_choice, verbose_name='羊品种')
    # 性别
    sex = models.CharField(max_length=2, choices=sex_choice, verbose_name='性别')
    # 出生日期'
    # birthday = models.CharField(max_length=20,default=datetime.date.strftime(datetime.date.today(), "%Y-%m-%d"),verbose_name='出生日期',blank=True,)
    birthday = models.DateField(default=datetime.date.strftime(datetime.date.today(), "%Y-%m-%d"), verbose_name='出生日期')
    # 初生重'
    birthday_weight = models.FloatField(verbose_name='初生重')
    # 断奶重
    weaning_weight = models.FloatField(verbose_name='断奶重', blank=True, null=True)
    # 成年体重
    weight = models.FloatField(verbose_name='体重', blank=True, null=True)
    # 羊的级别
    grade = models.CharField(max_length=3, choices=grade_choice, verbose_name='羊的级别', blank=True)
    # 种公羊射精量
    ejaculatory_amount = models.CharField(max_length=3, choices=grade_choice, verbose_name='射精量', blank=True,null=True)
    # 年均产奶量
    avg_milk_year = models.FloatField(blank=True, null=True, verbose_name='年平均产奶量')
    # 总产量
    all_milk = models.FloatField(blank=True, null=True, verbose_name='终生总产量')
    # 父代
    father = models.CharField(blank=True, null=True, max_length=50, verbose_name='父代')
    # 母代
    mather = models.CharField(blank=True, null=True, max_length=50, verbose_name='母代')
    #  羊圈外键：羊舍通过fold属性就能看到所有和自己关联的羊，也就是羊舍里面的每一头羊的信息。
    fold = models.ForeignKey(to='Sheep_Fold', on_delete=models.CASCADE)
    # 牧场外键
    farm = models.IntegerField(verbose_name='所属养场')
    #  羊现在的状态
    sheep_status = models.CharField(max_length=3, choices=status_choice, verbose_name='羊现在的状态',default='')
    # 逻辑删除
    isdelete = models.BooleanField(default=False, verbose_name='逻辑删除')
    class Meta:
        db_table = 'sheep_info'

羊信息录入的前端

五：表五的字段分析

# 羊活淘的羊信息
class Sheep_Info_LiveOut(models.Model):
    # 羊品种类型
    type_choice = (
        ('', '萨能奶山羊 '),
        ('', '关中奶山羊'),
        ('', '其他')
    )
    # 性别
    sex_choice = (
        ('', '公'),
        ('', '母')
    )
    # 级别
    grade_choice = (
        ('', '特级'),
        ('', '一级'),
        ('', '二级')
    )
    status_choice = (
        ('','在场'),
        ('','活淘'),
        ('','死亡')
    )

    # 羊的ID
    s_id = models.AutoField(primary_key=True, verbose_name='羊ID号')
    # 羊编号/耳号
    sheep_number = models.IntegerField(null=False, verbose_name='羊编号/耳号')
    # 设备号
    equipment_number = models.CharField(max_length=20, verbose_name='设备号', null=True)
    # 羊品种
    sheep_type = models.CharField(max_length=3, choices=type_choice, verbose_name='羊品种')
    # 性别
    sex = models.CharField(max_length=2, choices=sex_choice, verbose_name='性别')
    # 出生日期'
    # birthday = models.CharField(max_length=20,default=datetime.date.strftime(datetime.date.today(), "%Y-%m-%d"),verbose_name='出生日期',blank=True,)
    birthday = models.DateField(default=datetime.date.strftime(datetime.date.today(), "%Y-%m-%d"), verbose_name='出生日期')
    # 初生重'
    birthday_weight = models.FloatField(verbose_name='初生重')
    # 断奶重
    weaning_weight = models.FloatField(verbose_name='断奶重', blank=True, null=True)
    # 成年体重
    weight = models.FloatField(verbose_name='体重', blank=True, null=True)
    # 羊的级别
    grade = models.CharField(max_length=3, choices=grade_choice, verbose_name='羊的级别', blank=True)
    # 种公羊射精量
    ejaculatory_amount = models.CharField(max_length=3, choices=grade_choice, verbose_name='射精量', blank=True,null=True)
    # 年均产奶量
    avg_milk_year = models.FloatField(blank=True, null=True, verbose_name='年平均产奶量')
    # 总产量
    all_milk = models.FloatField(blank=True, null=True, verbose_name='终生总产量')
    # 父代
    father = models.CharField(blank=True, null=True, max_length=50, verbose_name='父代')
    # 母代
    mather = models.CharField(blank=True, null=True, max_length=50, verbose_name='母代')
    #  羊圈外键
    fold = models.ForeignKey(to='Sheep_Fold', on_delete=models.CASCADE)
    # 牧场外键
    farm = models.IntegerField(verbose_name='所属养场')
    #  羊现在的状态
    sheep_status = models.CharField(max_length=3, choices=status_choice, verbose_name='羊现在的状态',default='')
    # 逻辑删除
    isdelete = models.BooleanField(default=False, verbose_name='逻辑删除')
    class Meta:
        db_table = 'sheep_info_liveOut'

六：表六的字段分析

# 羊死亡的信息
class Sheep_Info_Death(models.Model):
    # 羊品种类型
    type_choice = (
        ('', '萨能奶山羊 '),
        ('', '关中奶山羊'),
        ('', '其他')
    )
    # 性别
    sex_choice = (
        ('', '公'),
        ('', '母')
    )
    # 级别
    grade_choice = (
        ('', '特级'),
        ('', '一级'),
        ('', '二级')
    )
    status_choice = (
        ('', '在场'),
        ('', '活淘'),
        ('', '死亡')
    )

    # 羊的ID
    s_id = models.AutoField(primary_key=True, verbose_name='羊ID号')
    # 羊编号/耳号
    sheep_number = models.IntegerField(null=False, verbose_name='羊编号/耳号')
    # 设备号
    equipment_number = models.CharField(max_length=20, verbose_name='设备号', null=True)
    # 羊品种
    sheep_type = models.CharField(max_length=3, choices=type_choice, verbose_name='羊品种')
    # 性别
    sex = models.CharField(max_length=2, choices=sex_choice, verbose_name='性别')
    # 出生日期'
    # birthday = models.CharField(max_length=20,default=datetime.date.strftime(datetime.date.today(), "%Y-%m-%d"),verbose_name='出生日期',blank=True,)
    birthday = models.DateField(default=datetime.date.strftime(datetime.date.today(), "%Y-%m-%d"), verbose_name='出生日期')
    # 初生重'
    birthday_weight = models.FloatField(verbose_name='初生重')
    # 断奶重
    weaning_weight = models.FloatField(verbose_name='断奶重', blank=True, null=True)
    # 成年体重
    weight = models.FloatField(verbose_name='体重', blank=True, null=True)
    # 羊的级别
    grade = models.CharField(max_length=3, choices=grade_choice, verbose_name='羊的级别', blank=True)
    # 种公羊射精量
    ejaculatory_amount = models.CharField(max_length=3, choices=grade_choice, verbose_name='射精量', blank=True, null=True)
    # 年均产奶量
    avg_milk_year = models.FloatField(blank=True, null=True, verbose_name='年平均产奶量')
    # 总产量
    all_milk = models.FloatField(blank=True, null=True, verbose_name='终生总产量')
    # 父代
    father = models.CharField(blank=True, null=True, max_length=50, verbose_name='父代')
    # 母代
    mather = models.CharField(blank=True, null=True, max_length=50, verbose_name='母代')
    #  羊圈外键
    fold = models.ForeignKey(to='Sheep_Fold', on_delete=models.CASCADE)
    # 牧场外键
    farm = models.IntegerField(verbose_name='所属养场')
    #  羊现在的状态
    sheep_status = models.CharField(max_length=3, choices=status_choice, verbose_name='羊现在的状态', default='')
    # 逻辑删除
    isdelete = models.BooleanField(default=False, verbose_name='逻辑删除')
    class Meta:
        db_table = 'sheep_info_death'