Question

当我提交表单数据时，数据添加到mysql数据库，值显示为未定义。
任何人都可以向我展示这个问题，我对NodeJs的发展很新。

HTML doc

<html>

    <form method="post" action="/add">

    Name : <input   name="mname" type ="text" > <p>
    Age :  <input name="mage"   type ="text" > <p>
    Department : <input name="mdepartment"   type="text" > <p>
    City : <input   name="mcity" type = "text"> <p>

    <input type="submit" value ="submit">
    <input type="reset" value="reset"> 
    </form>
</center>

和我的Javascript文件如下

myapp.js

 var express = require('express');
var path = require('path');
var mysql = require('mysql');
var app = express();
var bodyparser = require('body-parser');

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

connection.query('USE samplenodejs');

app.set('port',3000);


app.use(bodyparser.urlencoded({extended : false}));

app.get('/', function(req, res) {
    console.log('GET /');
    res.sendFile(__dirname + '/AddDetails.html');
});


app.post('/add',function(req,res){

connection.query("INSERT INTO test VALUES('','"+req.body.mname+"','"+req.body.mage+"','"+req.body.mcity+"','"+req.body.mdepartment+"')",function(err,res){
    if(err) throw err;
});
res.redirect('/');

});


app.listen(app.get('port'));
console.log('Express server listening on port '+app.get('port'));

Answer 1

我希望您从客户端获得有效数据。以下是插入数据的功能。 Mysql字符串常量应该用"引号括起来。

app.post('/add',function(req,res){
    //Check this log in console, it should print all the values properly, if not issue is at clinet side
    console.log('Input:: name='+req.body.mname+' age='+ req.body.mage +' city='+ req.body.mcity + ' dep=' + req.body.mdepartment,   req.body);

    var Query = `INSERT INTO test (id, name, age, city, department) VALUES ("", "${req.body.mname}","${req.body.mage}","${req.body.mcity}","${req.body.mdepartment}" )`;

    //printing query in the console, if you still face the issue, you can execute this query manually.
    console.log("Query :" + Query );

    connection.query(Query, function(err,res){
        if(err) {
          console.error('Error in sql query:' + Query + ' Err', err);
          throw err;
        }
    });
    res.redirect('/');
});

您不应该将用户输入直接传递给SQL查询，总是需要进行输入验证。

在NodeJs中，最好使用JSON键：值对进行插入，如下所示   connection.query（＆＃39; INSERT INTO test SET？＆＃39;，{name：req.body.mname，age：req.body.mage}，function（err，res）{}）;

在Mysql数据库中未定义NodeJS提交的数据

1 个答案: