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const express = require('express');
const mysql = require('mysql2');
const app = express();
const PORT = process.env.PORT || 3000;
app.set('views', `${__dirname}/views`);
app.set('view engine', 'ejs');
const connection = mysql.createConnection({
host: 'localhost',
user: 'root',
database: 'paging_test',
});
app.get('/', (req, res) => {
const pageNum = Number(req.query.pageNum) || 1;
const contentSize = 10;
const pnSize = 10;
const skipSize = (pageNum - 1) * contentSize;
connection.query('SELECT count(*) as `count` FROM `articles`', (countQueryErr, countQueryResult) => {
if (countQueryErr) throw countQueryErr;
const totalCount = Number(countQueryResult[0].count);
const pnTotal = Math.ceil(totalCount / contentSize);
const pnStart = ((Math.ceil(pageNum / pnSize) - 1) * pnSize) + 1;
let pnEnd = (pnStart + pnSize) - 1;
connection.query('SELECT * FROM `articles` ORDER BY id DESC LIMIT ?, ?', [skipSize, contentSize], (contentQueryErr, contentQueryResult) => {
if (contentQueryErr) throw contentQueryErr;
if (pnEnd > pnTotal) pnEnd = pnTotal;
const result = {
pageNum,
pnStart,
pnEnd,
pnTotal,
contents: contentQueryResult,
};
res.render('index', {
articles: result,
});
});
});
});
app.get('/view/:id', (req, res) => {
const { id } = req.params;
connection.query('SELECT * FROM `articles` WHERE id = ?', [id], (err, results) => {
if (err) throw err;
res.render('view', {
article: results[0],
});
});
});
app.listen(PORT, () => {
console.log(`express is running on port ${PORT}`);
});
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