完成增删改的学习

orm_demo/orm_crud.py

@@ -36,7 +36,7 @@ user_e1 = UserExtendInfo(username='张三', true_name='张三丰', sex=1, age=33
                          status=1, memo='', user=user1, depart=department1)
 user_e1.save()
 
-# 插入ManyToMany字段数据
+# 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
@@ -54,6 +54,15 @@ 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()
@@ -100,3 +109,28 @@ for card in card_zhang:
 # 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()