how to write a select sql query in javascript

To write a select SQL query in JavaScript, you can use the mysql package in Node.js. Here's an example of how to do it:

index.tsx
const mysql = require('mysql');

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

connection.connect();

const queryString = 'SELECT * FROM table_name';

connection.query(queryString, function (error, results, fields) {
  if (error) throw error;
  // Do something with the results
  console.log(results);
});

connection.end();
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In this example, we start by creating a connection to our MySQL database using the mysql.createConnection() function. We then call the connect() method to open the connection.

Next, we define our SQL query as a string and pass it to the connection.query() method along with a callback function. This function will be called with the results of the query.

Inside the callback function, we can do something with the results. In this example, we simply log them to the console.

Finally, we call connection.end() to close the connection to the database.