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@@ -0,0 +1,225 @@
+## 字段类型
+
+- `BooleanField`
+
+- `IntegerField`
+
+- `BigIntField`
+
+- `FloatField`
+
+- `DecimalField`
+
+- `CharField` == mysql `varchar`
+
+- `TextField`
+
+    > 大的文本和图片，推荐存路径(URL 或者 URI)
+
+- `AutoField`
+- `ImageField`
+- `EmailField`
+- `UUIDField`
+- `DateTimeField`
+
+## 字段约束
+
+- primary_key
+- null
+- blank
+- unique
+- default
+- time
+    - auto_now_add
+    - auto_now
+
+## myblog
+
+```
+# start app
+python manage.py startapp myblog
+# add class name in settings.py
+```
+
+```python
+# your models.py
+from django.db import models
+
+class Person(models.Model):
+	name = models.CharField(max_length=191)
+	email = models.EmailField()
+	create_time = models.DateTimeField(auto_now_add=True)
+	update_time = models.DateTimeField(auto_add=True)
+	
+	null_test = models.CharField(max_length=100, null=True)
+	blank_test = models.CharFiled(max_length=100, blank=True)
+	
+	class Meta:
+		abstract = True
+
+class Reader(Person):
+    whether_vip = models.BooleanField(default=False)
+```
+
+```
+python manage.py makemigrations myblog  # 在本地更新数据
+python manage.py migrate  # 与数据库同步
+```
+
+## 内嵌类
+
+- abstract
+
+- app_label
+
+- db_table
+
+- managed
+
+- ordering
+
+    - `-` 降序排列
+
+        ordering = ['-order_date']
+
+    - `?` 随机
+
+- indexes
+
+```python
+# 普通继承
+class Reader(Person):
+    whether_vip = models.BooleanField(default=False)
+    
+    class Meta:
+    	db_table = "reader"
+        managed = False
+
+# 多重继承
+class Record(student, book):
+    _id = models.AutoField(primary_key=True, db_column='id')
+```
+
+## 实例方法
+
+- get_lastest_by
+
+- refresh_from_db
+
+- 字段验证  # 检验当前格式是否正确
+
+    clean_fields()
+
+- 字段唯一性验证  # 去掉可能为空的字段
+
+    ```
+    unique_together = ['name', 'email']
+    reader.validate_unique(exclude=['null_test', 'create_time', 'update_time'])
+    ```
+
+## django.setup()
+
+```python
+import os
+import django
+import random
+
+
+def create_reader():
+    for i in range(100):
+        reader = Reader(
+        	name=f'name_{i}'
+            email=f'email_{i}@163.com'
+            null_test=None,
+            blank_test='',
+            whether_vip=random.choice([True, False])
+        )
+    reader.clean_fields(exclude=['null_test'])
+    reader.save()
+
+
+if __name__ = "__main__":
+	os.environ.setdefault("DJANGO_SETTINGS_MODULE", "mysite.settings")
+	django.setup()
+    from myblog.models import Reader
+    create_reader()
+```
+
+## QuerySet
+
+- Create
+
+    - save
+
+- Retrieve
+
+    - all()  # 获取所有记录
+
+        ```
+        read_array = Reader.objects.all()
+        ```
+
+    - get()  # 拿到一条数据
+
+    - filter()  # 匹配满足条件的记录
+
+        - ```
+            gte
+            gt
+            lte
+            lt
+            filter(id__gte=300)
+            ```
+
+        - 模糊匹配
+
+            ```
+            __contains
+            __in
+            __startswith
+            __endswith
+            ```
+
+    - exclude()  # 取反
+
+- Update
+
+- Delete
+
+## 高级
+
+- 事务
+
+- raw
+
+    - ```
+        >>> for p in Person.objects.raw('SELECT * FROM myapp_person'):
+        ...     print(p)
+        ```
+
+- 手动选择数据库
+
+    - ```
+        DATABASES = {
+            'default': {
+                'ENGINE': 'django.db.backends.mysql',
+                'NAME': 'polls',
+                'USER': 'root',
+                'PASSWORD': 'wxx33043',
+                'HOST': '127.0.0.1',
+                'PORT': '3306',
+            },
+            'users': {
+                'NAME': 'user_data',
+                'ENGINE': 'django.db.backends.mysql',
+                'USER': 'mysql_user',
+                'PASSWORD': 'priv4te'
+            }
+        }
+        ```
+
+    - ```
+        Author.objects.using('default').all()
+        ```
+
+        
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