first commit

app/routes/items.py

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+from fastapi import APIRouter, HTTPException
+from typing import List, Optional
+from pydantic import BaseModel
+
+router = APIRouter()
+
+class Item(BaseModel):
+    id: int
+    name: str
+    description: Optional[str] = None
+    price: float
+    in_stock: bool = True
+
+# 模拟数据
+items_db = [
+    Item(id=1, name="商品1", description="这是商品1", price=99.99, in_stock=True),
+    Item(id=2, name="商品2", description="这是商品2", price=199.99, in_stock=False),
+    Item(id=3, name="商品3", price=299.99, in_stock=True),
+]
+
+@router.get("/items", response_model=List[Item])
+def get_all_items():
+    """获取所有商品"""
+    return items_db
+
+@router.get("/items/{item_id}", response_model=Item)
+def get_item(item_id: int):
+    """根据ID获取商品"""
+    for item in items_db:
+        if item.id == item_id:
+            return item
+    raise HTTPException(status_code=404, detail="商品未找到")
+
+@router.post("/items", response_model=Item)
+def create_item(item: Item):
+    """创建新商品"""
+    # 检查ID是否已存在
+    for existing_item in items_db:
+        if existing_item.id == item.id:
+            raise HTTPException(status_code=400, detail="商品ID已存在")
+
+    items_db.append(item)
+    return item
+
+@router.put("/items/{item_id}", response_model=Item)
+def update_item(item_id: int, item: Item):
+    """更新商品"""
+    for index, existing_item in enumerate(items_db):
+        if existing_item.id == item_id:
+            items_db[index] = item
+            return item
+    raise HTTPException(status_code=404, detail="商品未找到")
+
+@router.delete("/items/{item_id}")
+def delete_item(item_id: int):
+    """删除商品"""
+    for index, item in enumerate(items_db):
+        if item.id == item_id:
+            del items_db[index]
+            return {"message": "商品已删除"}
+    raise HTTPException(status_code=404, detail="商品未找到")