Fastapi 简单示例

简单示例

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel

app = FastAPI()

# 模拟数据库
db = []

# 请求体模型
class Item(BaseModel):
    name: str
    price: float

# 创建商品
@app.post("/items/")
def create_item(item: Item):
    db.append(item)
    return {"message": "Item created successfully"}

# 获取所有商品
@app.get("/items/")
def get_items():
    if not db:
        raise HTTPException(status_code=404, detail="No items found")
    return db

# 根据名称获取商品
@app.get("/items/{name}")
def get_item_by_name(name: str):
    for item in db:
        if item.name == name:
            return item
    raise HTTPException(status_code=404, detail="Item not found")

# 更新商品价格
@app.put("/items/{name}")
def update_item_price(name: str, price: float):
    for item in db:
        if item.name == name:
            item.price = price
            return {"message": "Item price updated"}
    raise HTTPException(status_code=404, detail="Item not found")

# 删除商品
@app.delete("/items/{name}")
def delete_item(name: str):
    for item in db:
        if item.name == name:
            db.remove(item)
            return {"message": "Item deleted"}
    raise HTTPException(status_code=404, detail="Item not found")

不需要数据库操作：

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel

app = FastAPI()

# 请求体模型
class Item(BaseModel):
    name: str
    price: float

# 创建商品
@app.post("/items/")
def create_item(item: Item):
    return {"message": "Item created successfully", "item": item}

# 获取所有商品
@app.get("/items/")
def get_items():
    return {"message": "Get all items"}

# 根据名称获取商品
@app.get("/items/{name}")
def get_item_by_name(name: str):
    return {"message": f"Get item by name: {name}"}

# 更新商品价格
@app.put("/items/{name}")
def update_item_price(name: str, price: float):
    return {"message": f"Update item price: {price}"}

# 删除商品
@app.delete("/items/{name}")
def delete_item(name: str):
    return {"message": f"Delete item: {name}"}

简单完整：

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel
import uvicorn

app = FastAPI()

# 请求体模型
class Item(BaseModel):
    name: str
    price: float

# 创建商品
@app.post("/items/")
def create_item(item: Item):
    return {"message": "Item created successfully", "item": item}

# 获取所有商品
@app.get("/items/")
def get_items():
    return {"message": "Get all items"}

# 根据名称获取商品
@app.get("/items/{name}")
def get_item_by_name(name: str):
    return {"message": f"Get item by name: {name}"}

# 更新商品价格
@app.put("/items/{name}")
def update_item_price(name: str, price: float):
    return {"message": f"Update item price: {price}"}

# 删除商品
@app.delete("/items/{name}")
def delete_item(name: str):
    return {"message": f"Delete item: {name}"}

if __name__ == "__main__":
    uvicorn.run(app, host="localhost", port=8000)