重构第一版：重新验证2.0推荐写法

debug/orm_app/base_test.py

@@ -0,0 +1,58 @@
+from sqlalchemy import Column, Integer, create_engine, String, ForeignKey,DATETIME,DateTime,func
+from sqlalchemy.ext.asyncio import create_async_engine, async_sessionmaker, AsyncSession
+from sqlalchemy.orm import sessionmaker,declarative_base,DeclarativeBase
+
+from fastapi import APIRouter, Depends
+from debug.orm_app.sqlalchemy_full_app import User
+
+from datetime import datetime
+
+
+db_url = "mysql+pymysql://geeker:geeker@localhost:3306/fastapi_tutor?charset=utf8mb4"
+
+engine = create_engine(db_url)
+session = sessionmaker(engine, expire_on_commit=False)
+
+# 外键引用
+Base = declarative_base()
+class MetaBaseFunc(Base):
+    __tablename__ = "meta_base_func"
+    id = Column(Integer, primary_key=True)
+    pass
+
+# Base.metadata.create_all(engine)
+# Base 基类 - 可行，但不建议用多个Base分别创建表
+# class Base(DeclarativeBase):
+#     pass
+
+class MetaBase(Base):
+    __tablename__ = "base_column_test"
+    id = Column(Integer, primary_key=True)
+    num = Column(String(30),nullable=False,unique=True)
+    name = Column(String(30),nullable=False,default="")
+
+    # null
+    education = Column(String(50), nullable=True)
+
+    # 索引与外键 - 运行时查找
+    f_id = Column(Integer,ForeignKey("meta_base_func.id"),nullable=False, index=True)
+    fd_id = Column(Integer,ForeignKey("meta_base_func.id"),nullable=True)
+
+
+    # 日期处理
+    create_date = Column(DATETIME
+                         , default=datetime.now  # 默认值是当前时间
+                         )
+    create_date1 = Column(DateTime, default=datetime.utcnow())
+
+    update_date = Column(DATETIME
+                         , default=datetime.now  # 首次创建的时间跟更新时间一致
+                         , onupdate=datetime.now
+                         )
+
+    # 默认值处理
+    create_time = Column(DateTime, nullable=False, server_default=func.now())
+    update_time = Column(DateTime, nullable=False, server_default=func.now(), onupdate=func.now())
+
+Base.metadata.create_all(engine)
+