Simple React with mySql fails to read table records - mysql

Question

I created a React project by entering the following command prompt commands
mkdir mysql-test && cd mysql-test
npm init –y
npm install mysql –save
Then I created a file called app.js and I put in the following code:
// app.js
const mysql = require('mysql');
// First you need to create a connection to the db
const con = mysql.createConnection({
host: 'rds-mysql-wmcw.cgz0te1dlkah.us-east-1.rds.amazonaws.com',
user: 'masterUsername',
password: 'masterPassword',
database : 'db_wmcw'
});
//try to connect to the mySql database. If an error occurs, display an
error message on the console
con.connect((err) => {
if(err){
console.log('Error connecting to Db');
return;
}
//a connection has been established to the database. Now, run a query against the table 'homepage'
//to retrieve each row and all columns of the table
console.log('Connection established');
con.query('SELECT * FROM homepage', (err,rows) => {
//if an error occurs when reading the data from the table, display the error on the console
if(err) {
console.log(err);
return;
}
//data has been retrieved from the table. display the data to the console
console.log('Data received from Db:\n');
console.log(rows);
});
});
con.end((err) => {
// The connection is terminated gracefully
// Ensures all previously enqueued queries are still
// before sending a COM_QUIT packet to the MySQL server.
});
Before I added the con.query command, when I type in app.js at the command prompt, the response back is Connection established. So I know that I am connecting to the mySql database. When I include the con.query command, and I type in app.js at the command prompt, I get the following error:
Connection established
{ Error: Cannot enqueue Query after invoking quit.
at Protocol._validateEnqueue (C:\jrs\codercamp\mysql-test\node_modules\mysql\lib\protocol\Protocol.js:203:16)
at Protocol._enqueue (C:\jrs\codercamp\mysql-test\node_modules\mysql\lib\protocol\Protocol.js:138:13)
at Connection.query (C:\jrs\codercamp\mysql-test\node_modules\mysql\lib\Connection.js:200:25)
at Handshake.con.connect (C:\jrs\codercamp\mysql-test\app.js:21:7)
at Handshake. (C:\jrs\codercamp\mysql-test\node_modules\mysql\lib\Connection.js:502:10)
at Handshake._callback (C:\jrs\codercamp\mysql-test\node_modules\mysql\lib\Connection.js:468:16)
at Handshake.Sequence.end (C:\jrs\codercamp\mysql-test\node_modules\mysql\lib\protocol\sequences\Sequence.js:83:24)
at Handshake.Sequence.OkPacket (C:\jrs\codercamp\mysql-test\node_modules\mysql\lib\protocol\sequences\Sequence.js:92:8)
at Protocol._parsePacket (C:\jrs\codercamp\mysql-test\node_modules\mysql\lib\protocol\Protocol.js:278:23)
at Parser.write (C:\jrs\codercamp\mysql-test\node_modules\mysql\lib\protocol\Parser.js:76:12) code: 'PROTOCOL_ENQUEUE_AFTER_QUIT', fatal: false }
Right at the top of the error it states Cannot enqueue Query after invoking quit. I don't understand why the system thinks I am executing the query after invoking quit. I am not invoking quit unless that is what happens when I execute con.end but con.end is the last statement to execute. It is way after the query call.
Any assistance is greatly appreciated.
Thank you.
PS - I have included the host name, user ID, password, and database name to make debugging easier. There is no real important data in the database

Answer 1

Okay, so the alternative solution would be uninstall mysql package and change with mysql2 package instead. As the author said:
MySQL2 is mostly API compatible with mysqljs and supports majority of features
This answer is for the questioner's comment on his post
If you really wanna reassign the one row of data, you can do:
const { product_detail, product_description } = results[0];
That's basic syntax :D (ES6 maybe)