FastAPI를 이용한 기본적인 CRUD API

참고 : 초보자를 위한 FastAPI 과정 - YouTube

from fastapi import FastAPI
from fastapi import Path
from typing import Optional
from pydantic import BaseModel

app = FastAPI()

students = {
    1: {
        "name":"John",
        "age":17, 
        "year":"year 12"
    }
}

class Student(BaseModel):
    name: str
    age: int
    year: str

class UpdateStudent(BaseModel):
    name: Optional[str] = None
    age: Optional[int] = None
    year: Optional[str] = None

@app.get("/")
def index():
    return {"message": "First Data"}

# path parameter
@app.get("/get-student/{student_id}")
def get_student(student_id: int): 
    return students[student_id]

# query parameter
# ex) google.com/results?search=Python
@app.get("/get-by-name")
def get_student(*, name: Optional[str] = None, test: int):
    for student_id in students:
        if students[student_id]["name"] == name:
            return students[student_id]
    return {"Data": "Not Found"}

# combine query parameter & path parameter
@app.get("/get-by-name/{student_id}")
def get_student(*, student_id: int, name: Optional[str] = None, test: int):
    for sid in students:
        if students[sid]["name"] == name:
            return students[sid]
    return {"Data": "Not Found"}

@app.post("/create-student/{student_id}")
def create_student(student_id: int, student: Student):
    if student_id in students:
        return {"Error": "Student already exists"}
    
    students[student_id] = student
    return students[student_id]

@app.put("/update-student/{student_id}")
def update_student(student_id: int, student: UpdateStudent):
    if student_id not in students:
        return {"Error": "Student does not exist"}
    
    if student.name != None:
        students[student_id].name = student.name

    if student.age != None:
        students[student_id].age = student.age

    if student.year != None:
        students[student_id].year = student.year
            
    return students[student_id]

@app.delete("/delete-student/{student_id}")
def delete_student(student_id: int):
    if student_id not in students:
        return {"Error": "student does not exist"}
    
    del students[student_id]
    return {"message": "Student deleted"}

> uvicorn myapi:app --reload  
INFO:     Will watch for changes in these directories: ['C:\\Users\\enkee\\OneDrive\\바탕 화면\\2023\\CS\\fastAPI']
INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
INFO:     Started reloader process [3368] using statreload
WARNING:  The --reload flag should not be used in production on Windows.
INFO:     Started server process [9808]
INFO:     Waiting for application startup.
INFO:     Application startup complete.
INFO:     127.0.0.1:2159 - "GET / HTTP/1.1" 200 OK
INFO:     127.0.0.1:2159 - "GET /favicon.ico HTTP/1.1" 404 Not Found