$$config title: TodoList 할일 삭제, 할일 수정 keywords: - IT - 수업내용 $$ # TodoList 수업 - 할일삭제, 할일수정 ```sql import axios from "axios"; import React, { useEffect, useRef, useState } from "react"; import TodoEdit from "./components/TodoEdit"; import TodoInsert from "./components/TodoInsert"; import TodoList from "./components/TodoList"; import TodoTemplate from "./components/TodoTemplate"; function App() { const [todos, setTodos] = useState([]); const [insertToggle, setInsertToggle] = useState(false); const [selectedTodo, setSelectedTodo] = useState(null); const [isLoading, setIsLoading] = useState(true); const [error, setError] = useState(null); const nextId = useRef(4); const handleDragStart = (e, todo) => { e.dataTransfer.effectAllowed = "move"; e.dataTransfer.setData("tmp", JSON.stringify(todo)); }; const handleDragOver = (e) => { e.preventDefault(); }; const handleDrop = async (e, targetItem) => { e.preventDefault(); try { const originalItem = await JSON.parse(e.dataTransfer.getData("tmp")); // 1 // setTodos((todos) => // todos.map((todo) => { // return todo.id === targetItem.id // ? { ...originalItem, id: targetItem.id } // : todo.id === originalItem.id // ? { ...targetItem, id: originalItem.id } // : todo; // }) // ); const data = await axios({ url: `http://localhost:4000/todos/swap/${originalItem.id}`, method: "PATCH", data: { targetId: targetItem.id }, }); setTodos(data.data); } catch (e) { setError(e); } }; const onInsert = (text) => { const todo = { id: nextId.current, text: text, checked: false, }; setTodos((todos) => todos.concat(todo)); nextId.current++; }; const onInsertToggle = () => { setInsertToggle((prev) => !prev); }; const onRemove = async (id) => { // setTodos((todos) => todos.filter((todo) => todo.id !== id)); try { await axios({ url: `http://localhost:4000/todos/${id}`, method: "DELETE", }); const data = await axios({ url: `http://localhost:4000/todos`, method: "GET", }); setTodos(data.data); } catch (e) { setError(e); } }; const onToggle = async (id) => { try { const data = await axios({ url: `http://localhost:4000/todos/check/${id}`, method: "PATCH", }); setTodos(data.data); } catch (e) { setError(e); } }; const onUpdate = (id, text) => { setTodos((todos) => todos.map((todo) => (todo.id === id ? { ...todo, text } : todo)) ); onInsertToggle(); }; useEffect(() => { const getData = async () => { try { const data = await axios({ url: "http://localhost:4000/todos", method: "GET", }); setTodos(data.data); setIsLoading(false); // throw new Error("조회중 에러발생!!"); // await new Promise((resolve, reject) => { // setTimeout(() => { // resolve() // }, 3000) // }) } catch (e) { setError(e); } }; getData(); }, []); if (error) { return <>에러: {error.message}; } if (isLoading) { return <>Loading...; } return ( {insertToggle && ( )} ); } export default App; ``` - 할일추가 (express) ```sql // app.js import express, { query } from "express"; import mysql from "mysql2/promise"; import cors from "cors"; import axios from "axios"; const app = express(); app.use(cors()); app.use(express.json()); const port = 4000; const pool = mysql.createPool({ host: "localhost", user: "sbsst", password: "sbs123414", database: "a9", waitForConnections: true, connectionLimit: 10, queueLimit: 0, }); const getData = async () => { const data = await axios.get("http://localhost:3000/todos"); }; app.get("/todos/:id/:contentId", async (req, res) => { // params 여러개 받기 const data = { todos: { id: req.params.id, contentId: req.params.contentId, }, }; const { todos: { id, contentId }, } = data; }); app.get("/todos", async (req, res) => { const [rows] = await pool.query("SELECT * FROM todo ORDER BY id DESC"); //getData() res.json(rows); }); app.post("/todos", async (req, res) => { const { body: { text }, } = req; await pool.query( ` INSERT INTO todo SET reg_date = NOW(), perform_date = '2022-08-09 12:12:12', checked = 0, text = ? `, [text] ); const [updatedTodos] = await pool.query( ` SELECT * FROM todo ORDER BY id DESC ` ); res.json(updatedTodos); }); app.get("/todos/:id/", async (req, res) => { //const id = req.params.id; const { id } = req.params; const [[todo]] = await pool.query( ` SELECT * FROM todo WHERE id = ? `, [id] ); if (!todo) { res.status(404).json({ msg: "not found", }); return; } res.json(todo); }); app.patch("/todos/:id", async (req, res) => { const { id } = req.params; const { perform_date, text } = req.body; const [rows] = await pool.query( ` SELECT * FROM todo WHERE id = ? `, [id] ); if (rows.length === 0) { res.status(404).json({ msg: "not found", }); } if (!perform_date) { res.status(400).json({ msg: "perform_date required", }); return; } if (!text) { res.status(400).json({ msg: "text required", }); return; } const [rs] = await pool.query( ` UPDATE todo SET perform_date = ?, text = ? WHERE id = ? `, [perform_date, text, id] ); const [updatedTodos] = await pool.query( ` SELECT * FROM todo ORDER BY id DESC ` ); res.json(updatedTodos); }); app.patch("/todos/check/:id", async (req, res) => { const { id } = req.params; const [[rows]] = await pool.query( ` SELECT * FROM todo where id = ? `, [id] ); if (!rows) { res.status(404).json({ msg: "not found", }); return; } await pool.query( ` UPDATE todo SET checked = ? WHERE id = ? `, [!rows.checked, id] ); const [updatedTodos] = await pool.query( ` SELECT * FROM todo ORDER BY id DESC ` ); res.json(updatedTodos); }); app.patch("/todos/swap/:id", async (req, res) => { const { id } = req.params; const { targetId } = req.body; if (!id) { res.status(400).json({ msg: "id required", }); return; } if (!targetId) { res.status(400).json({ msg: "id targetId", }); return; } await pool.query( ` UPDATE todo a INNER JOIN todo b ON a.id != b.id SET a.reg_date = b.reg_date, a.perform_date = b.perform_date, a.checked = b.checked, a.text = b.text WHERE a.id IN (? , ?) AND b.id IN (? , ?) `, [targetId, id, id, targetId] ); const [updatedTodos] = await pool.query( ` SELECT * FROM todo ORDER BY id DESC ` ); res.json(updatedTodos); }); app.delete("/todos/:id", async (req, res) => { const { id } = req.params; const [[todoRow]] = await pool.query( ` SELECT * FROM todo WHERE id = ?`, [id] ); if (todoRow === undefined) { res.status(404).json({ msg: "not found", }); return; } const [rs] = await pool.query( `DELETE FROM todo WHERE id = ?`, [id] ); res.json({ msg: `${id}번 할일이 삭제되었습니다.`, }); }); app.listen(port, () => { console.log(`Example app listening on port ${port}`); }); ```

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