如何使用 Node.js 通过单击按钮获取下一行数据库结果？

Question

I'm using Node.js to serve my webpage and get the database results from mysql. Right now I have it successfully connected and showing the first row of data.(I'm using these as button values in the html code below) However, I want the user to be able to click a button and get the next row of data.

var express = require("express");
var app = express();
var mysql = require('mysql');

var con = mysql.createConnection({
  // working connection
});

con.connect(function(err) {
  if (err) throw err;
  con.query("SELECT * FROM my_table limit 10", function (err, result, fields) {
    if (err) throw err;
    else{
      sandbox.big1Value = result[0].big1;
      sandbox.big2Value = result[0].big2;
    }
  });
});

app.get('/mypage', function (req, res) {
    res.render('mypage', { dbinput: sandbox });
});

<button type="button" id="big1" onclick="myFunction(this.value)" value=<%= dbinput.big1Value %> ><%= dbinput.big1Value %> </button>
<button type="button" id="big2" onclick="myFunction(this.value)" value=<%= dbinput.big2Value %>><%= dbinput.big2Value %> </button>
<!-- I want this button to get the next set of values -->
<button type="button" id="next" onclick="doSomething()" value="Next">Next One</button>

Answer 1

You can do this using limit and offset in mysql From documentation

Syntax: LIMIT {[offset,] row_count | row_count OFFSET offset} LIMIT {[offset,] row_count | row_count OFFSET offset}

Here in your case you can use:

SELECT * FROM my_table LIMIT 10, 10;  # Retrieve rows 11-20