项目初次搭建

app/db/db_base.py

@@ -0,0 +1,20 @@
+from sqlalchemy.ext.declarative import declarative_base, declared_attr
+from sqlalchemy.orm import Mapped, mapped_column
+import datetime
+
+Base = declarative_base()
+
+
+class DbCommon(Base):
+    __abstract__ = True
+    id: Mapped[int] = mapped_column(primary_key=True)
+    create_time: Mapped[datetime.datetime] = mapped_column(default=datetime.datetime.utcnow())
+    update_time: Mapped[datetime.datetime] = mapped_column(default=datetime.datetime.utcnow(), onupdate=datetime.datetime.utcnow())
+
+    def keys(self):
+        return ["id", "create_time", "update_time"]
+
+
+    @declared_attr
+    def __tablename__(cls):
+        return cls.__name__.lower()