Question

我正在使用NodeJs和MySQL创建用户登录/注册以在Android学校项目中使用，但是不确定如何检查用户是否已经存在相同的电子邮件。

下面是我的代码。

ps，我将对密码进行哈希处理。

// registration
router.post('/register', (req,res)=>{
    const name = req.body.name;
    const email= req.body.email
    const phone= req.body.phone;
    const password= req.body.password;
    const password2 = req.body.password2;
    let errors = [];

    //Check required fields
    if(!name || !email || !phone || !password || !password2){
        errors.push({msg: 'Please fill in all the fields'});
        res.send({message:'Please fill in all the fields'});
    }

    //Check passwords match
    if(password != password2){
        console.log('Passwords dont match');
        errors.push({msg: 'Passwords dont match'});
        res.send({message:'Passwords dont match'});
    }

    //Check password length
    if(password.length < 6){
        errors.push({msg: 'Password should be atleast 6 characters'});
        res.send({message:'Password should be atleast 6 characters'});
        
    }

    if(errors.length>0){

    }else{
        connection.query('INSERT INTO users(name, email, phone, password) VALUES("'+name+'", "'+email+'", "'+phone+'", "'+password+'")',
               [name, email, phone, password]);

        res.send('Welcome');
    }
    });

    

module.exports = router;

请帮助

Answer 1

代替此代码：

connection.query('INSERT INTO users(name, email, phone, password) VALUES("'+name+'", "'+email+'", "'+phone+'", "'+password+'")',
           [name, email, phone, password]);

您可以这样做：

connection.query('SELECT email FROM users WHERE email ="' + mysql.escape(email) +'"', function (err, result) {
    if (err) throw err;
    console.log(result);
    //You will get an array. if no users found it will return.

    if(result[0].email.length > 0){  
        //Then do your task (run insert query)
        connection.query('INSERT INTO users(name, email, phone, password) VALUES("'+name+'", "'+email+'", "'+phone+'", "'+password+'")',
               [name, email, phone, password]);

        res.send('Welcome');
    }
  });

使用NodeJ检查MySQL数据库中是否存在电子邮件

1 个答案: