初步增加 web 界面

web/backend/database.py

@@ -0,0 +1,53 @@
+"""数据库引擎与会话管理"""
+
+from pathlib import Path
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker, declarative_base
+
+DB_PATH = Path(__file__).parent.parent.parent / "data" / "web.db"
+DB_PATH.parent.mkdir(parents=True, exist_ok=True)
+
+engine = create_engine(
+    f"sqlite:///{DB_PATH}",
+    connect_args={"check_same_thread": False},
+    echo=False,
+)
+
+SessionLocal = sessionmaker(bind=engine, autocommit=False, autoflush=False)
+Base = declarative_base()
+
+
+def get_db():
+    """FastAPI 依赖：提供数据库会话，请求结束自动关闭。"""
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+
+def init_db():
+    """建表 + 写入初始数据。"""
+    Base.metadata.create_all(bind=engine)
+    _seed()
+
+
+def _seed():
+    """写入默认超管账号和角色。"""
+    from .models import User
+    from .security import hash_password
+
+    db = SessionLocal()
+    try:
+        if not db.query(User).first():
+            admin = User(
+                username="admin",
+                password_hash=hash_password("admin123"),
+                role="super_admin",
+                is_active=True,
+                remark="默认超级管理员",
+            )
+            db.add(admin)
+            db.commit()
+    finally:
+        db.close()