如何使用angular和nodejs - How (NULL，NULL)插入数据到mysql中-问题已解决

import { Component } from '@angular/core';
import { HttpClient } from '@angular/common/http';

@Component({
  selector: 'app-form',
  templateUrl: './form.component.html',
  styleUrls: ['./form.component.css']
})
export class FormComponent {
  formData = {
    name: '',
    age: ''
  };

  constructor(private http: HttpClient) { }

  onSubmit() {
    this.http.post('/api/insert', this.formData).subscribe(
      response => {
        console.log(response);
      },
      error => {
        console.error(error);
      }
    );
  }
}

const express = require('express');
const mysql = require('mysql2');
const app = express();

app.use(express.json());

const connection = mysql.createConnection({
  host: 'localhost',
  user: 'username',
  password: 'password',
  database: 'database_name'
});

connection.connect(error => {
  if (error) {
    console.error('Error connecting to MySQL database: ' + error.stack);
    return;
  }
  console.log('Connected to MySQL database');
});

app.post('/api/insert', (req, res) => {
  const { name, age } = req.body;
  const sql = 'INSERT INTO table_name (name, age) VALUES (?, ?)';
  const values = [name, age];

  connection.query(sql, values, (error, result) => {
    if (error) {
      console.error('Error inserting data into MySQL database: ' + error.stack);
      res.status(500).json({ success: false });
      return;
    }
    console.log('Data inserted into MySQL database');
    res.status(200).json({ success: true });
  });
});

app.listen(3000, () => {
  console.log('Server started on port 3000');
});