fastapi入门二复杂的get请求

从路径中获取参数

"""
@File    :   fastapiOne.py
@Desciption：
"""
import uvicorn
from fastapi import FastAPI

app = FastAPI()


@app.get("/fastapi/{date}")
async def date(date):
    return {"date": date}


if __name__ == "__main__":
    uvicorn.run(app='fastapiOne:app', host='127.0.0.1', port=8100, reload=True, debug=True)

请求

http://127.0.0.1:8100/fastapi/20201010

结果

{
    "date": "20201010"
}

从查询参数中获取参数

"""
@File    :   fastapiOne.py
@Desciption：
"""
import uvicorn
from fastapi import FastAPI

app = FastAPI()


@app.get("/fastapi/")
async def date(date, name):
    return {"date": date, "name": name}


if __name__ == "__main__":
    uvicorn.run(app='fastapiOne:app', host='127.0.0.1', port=8100, reload=True, debug=True)

请求

http://127.0.0.1:8100/fastapi/?date=20201010&name=zhangsan

结果

{
    "date": "20201010",
    "name": "zhangsan"
}

注意：这里的就默认了为string类型了

参数的类型校验

"""
@File    :   fastapiOne.py
@Desciption：
"""
import uvicorn
from fastapi import FastAPI

app = FastAPI()


@app.get("/fastapi/")
async def date(date: int, name: str):
    return {"date": date, "name": name}


if __name__ == "__main__":
    uvicorn.run(app='fastapiOne:app', host='127.0.0.1', port=8100, reload=True, debug=True)

请求

http://127.0.0.1:8100/fastapi/?date=20201010&name=zhangsan

结果

{
    "date": 20201010,
    "name": "zhangsan"
}

注意：这里的date就成了int类型了

参数的必填校验与默认参数

路径参数的必填校验

不用校验，为什么，因为路径不存在的话就是不存在，说明没有这个接口而已，没必要校验

查询参数的必填校验与默认参数—通过Query

异常情况，有参数未填写

"""
@File    :   fastapiOne.py
@Desciption：
"""
import uvicorn
from fastapi import FastAPI

app = FastAPI()


@app.get("/fastapi/")
async def date(date: int, name: str):
    return {"date": date, "name": name}


if __name__ == "__main__":
    uvicorn.run(app='fastapiOne:app', host='127.0.0.1', port=8100, reload=True, debug=True)

请求

http://127.0.0.1:8100/fastapi/?date=20201010

结果

{
    "detail": [
        {
            "loc": [
                "query",
                "name"
            ],
            "msg": "field required",
            "type": "value_error.missing"
        }
    ]
}

正常情况

"""
@File    :   fastapiOne.py
@Desciption：
"""
import uvicorn
from fastapi import FastAPI, Query  #通过导入Query可以实现这个功能

app = FastAPI()


@app.get("/fastapi/")
async def date(date: int = Query(20201111), name: str = Query(None)):
    # date被定义为了int类型，默认值是20201010，name被定义为了str，默认值为None
    return {"date": date, "name": name}


if __name__ == "__main__":
    uvicorn.run(app='fastapiOne:app', host='127.0.0.1', port=8100, reload=True, debug=True)

请求

http://127.0.0.1:8100/fastapi/?date=202010111

结果

{
    "date": 202010111,
    "name": null
}

请求

http://127.0.0.1:8100/fastapi/?name=zhangsan

结果

{
    "date": 20201111,
    "name": "zhangsan"
}