如何使用MySQL登录ReactJS，NodeJS？

Question

我是ReactJS的初学者，我想使用ReactJS，NodeJS和MySQL登录我的表单。

我的课程登录如下：

     handleClick(event){
    var self = this;
    var payload={
      "username":this.state.username,
        "password":this.state.password
    }
    axios({
          method: 'post',
          url: '/app/login/',
          data: payload,
          withCredentials: true,
          headers: {
            'Access-Control-Allow-Origin': '*',
            'Content-Type': 'application/json',
            'Accept': 'application/json',
          }
        })

   .then(function (response) {
     console.log(response);
     if(response.data.code == 200){

    this.props.history.push("http://localhost:5000/brillo#/");
     }
     else{
       swal("Erreur !", "Erreur !", "error");
     }
   })
   .catch(function (error) {
     console.log(error);
   });
  }
  handleredirect(){
    this.props.history.push("/register");
    }
  render() {
    return (
      <div className="app flex-row align-items-center">

                    <Form  method="POST" >

                      <InputGroup className="mb-3">
                        <Input type="text" placeholder="Username" autoComplete="username" value={this.state.username} onChange={e => this.setState({ username: e.target.value })} required/>
                      </InputGroup>
                      <InputGroup className="mb-4">
                        <Input type="password" value={this.state.password} placeholder="Password" onChange={e => this.setState({password: e.target.value })} autoComplete="current-password"   required/>
                      </InputGroup>
                      <Row>
                        <Col xs="6">
                          <Button type="button" color="primary" className="px-4" onClick={(event) => this.handleClick(event)}>Login</Button>
                        </Col>
                        <Col xs="6" className="text-right">
                          <Button color="link" className="px-0">Forgot password?</Button>
                        </Col>
                      </Row>
                    </Form>

      </div>
    );
  }
}

export default Login;

我的路由器：

exports.login = function(req,res){
  var email= req.body.email;
  var password = req.body.password;
 var username = req.params.username;
  connection.query('SELECT * FROM users WHERE username = ?',[username], function (error, results, fields) {
  if (error) {
   res.send({
      "code":400,
      "failed":"error ocurred"
    })
  }else{
    if(results.length >0){
      bcrypt.compare(password, results[0].password, function(err, doesMatch){
        if (doesMatch){
     res.send({
       "code":200,
       "success":"login sucessfull"
         });
      }else{
     res.send({
       "code":204,
       "success":"Email and password does not match"
         });
      }
    });
  }
    else{
      res.send({
        "code":204,
        "success":"Email does not exits"
          });
    }
  }
  });

}

当我通过张贴http://localhost:4000/app/login/与Postman运行我的后端时，我得到：

{
    "code": 204,
    "success": "Email does not exits"
}

但是我使用我在注册表上提交的用户名和密码发布，当我运行我的前端时，我得到：

{data: {…}, status: 200, statusText: "OK", headers: {…}, config: {…}, …}
config:
{
data:
code:204
success:"Email does not exits"

我想当我点击登录按钮时，它会被重定向到仪表板页面。

我该如何解决？

Answer 1

你的nodejs路由器似乎不正确，你从身体电子邮件，密码，用户名，但电子邮件不发送反应。那你在数据库，电子邮件或用户名中寻找什么？

接下来排队

connection.query('SELECT * FROM users WHERE username = ?',[username], function...

我认为应该更像是：

connection.query('SELECT * FROM users WHERE username = \'' + username + '\'', function...

顺便说一下，你的反应是不对的：你应该回复：

return res.status(500).json({ failed: 'error ocurred'})

并不是

res.send({"code":400,"failed":"error ocurred"})