完成增删改的学习

orm_demo/migrations/0002_cardinfo.py

@@ -0,0 +1,23 @@
+# Generated by Django 4.2.3 on 2023-07-08 02:10
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('orm_demo', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='CardInfo',
+            fields=[
+                ('id', models.AutoField(primary_key=True, serialize=False, verbose_name='银行卡编码')),
+                ('card_no', models.CharField(max_length=20, verbose_name='卡号')),
+                ('bank', models.CharField(max_length=10, verbose_name='银行')),
+                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='orm_demo.baseuserinfo')),
+            ],
+        ),
+    ]

orm_demo/migrations/0003_alter_cardinfo_table_comment_alter_cardinfo_table.py

@@ -0,0 +1,21 @@
+# Generated by Django 4.2.3 on 2023-07-08 02:12
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('orm_demo', '0002_cardinfo'),
+    ]
+
+    operations = [
+        migrations.AlterModelTableComment(
+            name='cardinfo',
+            table_comment='员工银行卡信息',
+        ),
+        migrations.AlterModelTable(
+            name='cardinfo',
+            table='orm_card_info',
+        ),
+    ]

orm_demo/migrations/0004_alter_cardinfo_user.py

@@ -0,0 +1,19 @@
+# Generated by Django 4.2.3 on 2023-07-08 03:44
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('orm_demo', '0003_alter_cardinfo_table_comment_alter_cardinfo_table'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='cardinfo',
+            name='user',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='user_card', to='orm_demo.baseuserinfo'),
+        ),
+    ]

orm_demo/models.py

@@ -63,3 +63,14 @@ class SkillInfo(models.Model):
     class Meta:
         db_table = 'orm_skill_info'
         db_table_comment = '技能信息'
+
+
+class CardInfo(models.Model):
+    id = models.AutoField(verbose_name='银行卡编码', primary_key=True)
+    card_no = models.CharField(verbose_name='卡号', max_length=20)
+    bank = models.CharField(verbose_name='银行', max_length=10)
+    user = models.ForeignKey(BaseUserInfo, related_name='user_card', on_delete=models.CASCADE)
+
+    class Meta:
+        db_table = 'orm_card_info'
+        db_table_comment = '员工银行卡信息'

orm_demo/orm_crud.py

@@ -15,7 +15,8 @@ user = BaseUserInfo.objects.create(username='张三', password='zhangsan', statu
 
 # create方式赋值， 字典格式数据
 data = {'username': '李四', 'password': 'lisi', 'status': 1}
-user = BaseUserInfo.objects.create(**data)
+# 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 = [
@@ -34,3 +35,68 @@ 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
+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)
+
+# 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)