nodejs sql code example

Example 1: mssql query node js

const sql = require('mssql')
const query=`select * from table`;
config = {
    database: "dbname",
  // can keep these option required with latest version of mssql npm package
    options: {
      enableArithAbort: true,
      encrypt: true,
      rowCollectionOnRequestCompletion: false,
    },
    parseJSON: true,
    password: "password",
    port: port, // if youe database running on difrent port then 1433
    server: "server ip or name",
    user: "usenme",
  };

 
sql.on('error', err => {
    // ... error handler
})
 
sql.connect(config).then(pool => {
    return pool.request()
        .query(query)
}).then(result => {
    console.log(result.recordset)
}).catch(err => {
    console.log(err)
});

Example 2: how to manage a db connection in javascript

//put these lines in a seperate file
const mysql = require('mysql2');

const connection = mysql.createPool({
    host: "localhost",
    user: "",
    password: "",
    database: ""
    // here you can set connection limits and so on
});

module.exports = connection;

//put these on destination page
const connection = require('../util/connection');

async function getAll() {
    const sql = "SELECT * FROM tableName";
    const [rows] = await connection.promise().query(sql);
    return rows;
} 
exports.getAll = getAll;

Example 3: use nodejs mysql

var mysql      = require('mysql');var connection = mysql.createConnection({  host     : 'localhost',  user     : 'me',  password : 'secret',  database : 'my_db'}); connection.connect(); connection.query('SELECT 1 + 1 AS solution', function (error, results, fields) {  if (error) throw error;  console.log('The solution is: ', results[0].solution);}); connection.end();

Example 4: js read mysql database

// Use https://github.com/JackChilds/jsmysqldb

// Then once it's setup you can just do this:

// Config that will be sent to server
const config = {
  "table" : "customers",
  "limit" : "50",
  "offset" : "0"
};

// Use the _POST_REQUEST function to send data to the server and get a response
_POST_REQUEST("link-to-server/database.php", 'config=' + JSON.stringify(config), (response) => {
  // Convert the response into an array of rows:
  var data = JSON.parse(response);
  // Now do what you want with data
  // data[row index][column name]
});