django_demo/orm_demo/orm_crud.py

from orm_demo.models import *

# 插入数据
# 先实例化对象，然后为对象赋值
depart_data = DepartInfo()
depart_data.depart_name = '开发部'
depart_data.save()

# 实例化对象同时赋值
skill_data = SkillInfo(skill_name='PHP')
skill_data.save()

# create方法赋值
user = BaseUserInfo.objects.create(username='张三', password='zhangsan', status=1)

# create方式赋值， 字典格式数据
data = {'username': '李四', 'password': 'lisi', 'status': 1}
# data2 = dict(username='李四', password='lisi', status=1)  # 另一种字典数据定义形势
user2 = BaseUserInfo.objects.create(**data)

# 批量插入
data_list = [
    {'username': '王五', 'password': 'wangwu', 'status': 1},
    {'username': '孙六', 'password': 'sunliu', 'status': 1}
]
user_obj_list = []
for data in data_list:
    user_obj = BaseUserInfo(username=data['username'], password=data['password'], status=data['status'])
    user_obj_list.append(user_obj)
users = BaseUserInfo.objects.bulk_create(user_obj_list)

# 插入外键关联的数据
user1 = BaseUserInfo.objects.filter(username='张三').first()
department1 = DepartInfo.objects.filter(depart_name='开发部').first()
user_e1 = UserExtendInfo(username='张三', true_name='张三丰', sex=1, age=33, department='开发部', salary='230000.00',
                         status=1, memo='', user=user1, depart=department1)
user_e1.save()

# 插入ManyToMany字段数据add()和set()
skill_php = SkillInfo.objects.filter(skill_name='PHP').first()
user_zhang = UserExtendInfo.objects.filter(username='张三').first()
skill_php.user.add(user_zhang)  # 使用add方法添加外键关联关系

# 一次建立多个连接关系
skill_py = SkillInfo.objects.filter(skill_name='Python').first()
user_zhang = UserExtendInfo.objects.filter(username='张三').first()
user_sun = UserExtendInfo.objects.filter(username='孙六').first()
skill_py.user.add(user_zhang, user_sun)  # add方法可以添加多个关联关系

# 直接创建关联关系数据
skill_draw = SkillInfo.objects.filter(skill_name='draw').first()
user_zhou = BaseUserInfo.objects.filter(username='周七').first()
depart_zhou = DepartInfo.objects.filter(depart_name='设计部').first()
skill_draw.user.create(username='周七', true_name='周七天', sex=0, age=18, department='设计部', salary='8500.00',
                       status=1, memo='', user=user_zhou, depart=depart_zhou)

# 使用set修改关联数据
user_design = UserExtendInfo.objects.filter(department='设计部').all()
skill_ps = SkillInfo.objects.get(skill_name='Photoshop')
skill_ps.user.set(user_design)

# 直接给定id
skill_draw = SkillInfo.objects.get(skill_name='draw')
skill_draw.user.set([3])

# 批量关联多对多数据
skill_dev = SkillInfo.objects.filter(skill_name__in=['JavaScript', 'PHP']).all()
user_dev = UserExtendInfo.objects.filter(department='开发部').all()
for skill in skill_dev:
    skill.user.add(*user_dev)

# 更新数据
# 查询出结果后通过赋值方式使用save方法保存
skill_data = SkillInfo.objects.filter(skill_name='测试').first()
skill_data.skill_name = 'Test'
skill_data.save()

# 使用update方式直接修改
skill_data1 = SkillInfo.objects.filter(skill_name='画图').update(skill_name='draw')

# 删除数据 返回删除结果 (2, {'orm_demo.SkillInfo': 2})
SkillInfo.objects.create(skill_name='delete')
SkillInfo.objects.create(skill_name='delete')
del_skill = SkillInfo.objects.filter(skill_name='delete').delete()
print(del_skill)

# 关联表查询 一对一
# 通过扩展表名查询
user_li = BaseUserInfo.objects.filter(username='李四').first()
print(user_li.userextendinfo.true_name)  # 扩展表名需要小写， 返回：李四喜

# 通过关联字段查询
user_extend_li = UserExtendInfo.objects.filter(true_name__contains='李四').first()
print(user_extend_li.user.password)  # 使用关联字段名称， 返回：lisi

# 关联表查询 一对多
# 正向查询
user_zhang = BaseUserInfo.objects.get(id=1)
card_zhang = user_zhang.cardinfo_set.all()  # 使用小写的表名加上_set做为关联字段
for card in card_zhang:
    print(card.card_no)

# 正向查询 related_name 指定关联名称
user_zhang = BaseUserInfo.objects.get(id=1)
card_zhang = user_zhang.user_card.all()  # 使用指定的关联名做为关联字段
for card in card_zhang:
    print(card.card_no)

# 反向查询
card = CardInfo.objects.filter(user_id=1).first()
print(card.user.username)

# 多对多查询
# 正向查询
user_zhang = UserExtendInfo.objects.get(username='张三')
skill_user_zhang = user_zhang.skillinfo_set.all()
print(skill_user_zhang)

# 反向查询
skill_py = SkillInfo.objects.filter(skill_name='Python').first()
for user in skill_py.user.all():
    print(user.true_name)

# 多对多删除关联数据 remove clear
# 删除指定用户的指定技能
user_del = UserExtendInfo.objects.get(id=5)
skill_del = SkillInfo.objects.get(id=7)
result = skill_del.user.remove(user_del)

# 通过id指定删除哪个用户
skill_del = SkillInfo.objects.get(id=1)
result = skill_del.user.remove(2)

# 清除全部
skill_del = SkillInfo.objects.get(id=8)
result = skill_del.user.clear()