Question

我创建了一个项目，其中包含我在mysql上编写的数据库，它从数据库创建一个json文件，并在浏览器中输出所有用户但我有一些问题。我想输出一个用户我该怎么做（这是示例如何输出http://localhost:8080/user/1）。我用了express和mysql。请帮我。感谢。

这是我的代码：

'use strict';
const mysql = require('mysql');
const express = require('express');
const http = require('http');
const router = express()

// http://nodejs.org/docs/v0.6.5/api/fs.html#fs.writeFile
const fs = require('fs');

const connection = mysql.createConnection({
    host: 'localhost',
    user: 'lado',
    password: '1234'
});

connection.connect();

connection.query('SELECT * FROM bankdb.account;', function(err, results, fields) {
    if(err) throw err;

    fs.writeFile('account.json', JSON.stringify(results), function (err) {
        if (err) throw err;
        console.log('Saved!');
    });
    connection.end();
});


const pool = mysql.createPool({
    host: 'localhost',
    user: 'lado',
    password: '1234',
    database: 'bankdb',
    charset: 'utf8'
});
var reo ='<html><head><title>Output From MYSQL</title></head><body><h1>Output From MYSQL</h1>{${table}}</body></html>';
function setResHtml(sql, cb){
    pool.getConnection((err, con)=>{
        if(err) throw err;

        con.query(sql, (err, res, cols)=>{
            if(err) throw err;

            var table =''; //to store html table

            //create html table with data from res.
            for(var i=0; i<res.length; i++){
                table +='<tr><td>' + (i+1) +'</td><td>'+ res[i].name +'</td><td>'+ res[i].address +'</td></tr>';
            }
            table ='<table border="1"><tr><th>ID</th><th>Name</th><th>Amount</th></tr>'+ table +'</table>';

            con.release(); //Done with mysql connection

            return cb(table);
        });
    });
}

const sqll ='SELECT * FROM bankdb.account';

const server = http.createServer((req, res)=>{
    setResHtml(sqll, resql=>{
        reo = reo.replace('{${table}}', resql);
        res.writeHead(200, {'Content-Type':'text/html; charset=utf-8'});
        res.write(reo, 'utf-8');
        res.end();
    });
});

server.listen(8080, ()=>{
    console.log('Server running at //localhost:8080/');
    router.get('/users/:id', function(req, res, next) {
        var user = users.getUserById(req.params.id);
        res.json(user);
    });
    exports.getUserById = function(id) {
        for (var i = 0; i < users.length; i++) {
            if (users[i].id == id) return users[i];
        }
    };
});

Answer 1

根据他们的ID获取特定用户：

router.get( '/user/:id', function( req, res ) { // When visiting '/user/:id'

   var id = req.params.id; // For example if you visit localhost/user/24 the id will be 24

   connection.query('SELECT * FROM bankdb.account WHERE id=' + mysql.escape( id ), function(err, results, fields) {
       if(err) throw err;

       fs.writeFile('account.json', JSON.stringify(results), function (err) {
         if (err) throw err;
         console.log('Saved!');
       });
       connection.end();
   });

} );

如果您从数据库中获取每个用户，您的程序将耗尽更多内存。

抓住你需要的那个并和他一起工作。

NodeJS在浏览器中输出用户

1 个答案: