Start moving portals and users to SQLAlchemy Core

mautrix_telegram/base.py

@@ -1,2 +1,41 @@
+from abc import abstractmethod
+
+from sqlalchemy import Table
+from sqlalchemy.engine.base import Engine
+from sqlalchemy.engine.result import RowProxy
+from sqlalchemy.sql.base import ImmutableColumnCollection
 from sqlalchemy.ext.declarative import declarative_base
-Base = declarative_base()  # type: declarative_base
+
+
+class BaseBase:
+    db = None  # type: Engine
+    t = None  # type: Table
+    __table__ = None  # type: Table
+    c = None  # type: ImmutableColumnCollection
+
+    @classmethod
+    @abstractmethod
+    def _one_or_none(cls, rows: RowProxy):
+        pass
+
+    @classmethod
+    def _select_one_or_none(cls, *args):
+        return cls._one_or_none(cls.db.execute(cls.t.select().where(*args)))
+
+    @property
+    @abstractmethod
+    def _edit_identity(self):
+        pass
+
+    def update(self, **values) -> None:
+        self.db.execute(self.t.update()
+                        .where(self._edit_identity)
+                        .values(**values))
+        for key, value in values.items():
+            setattr(self, key, value)
+
+    def delete(self) -> None:
+        self.db.execute(self.t.delete().where(self._edit_identity))
+
+
+Base = declarative_base(cls=BaseBase)