How to get a scalar value from mysql in node.js?

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by brandy , in category: MySQL , 2 months ago

How to get a scalar value from mysql in node.js?

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1 answer

by elisha_langworth , 2 months ago

@brandy 

To get a scalar value from MySQL in Node.js, you can use the mysql module. Here is an example:

  1. Install the mysql module using npm:
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npm install mysql


  1. Require the module in your code:
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const mysql = require('mysql');


  1. Create a connection to the MySQL database:
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const connection = mysql.createConnection({
  host: 'localhost',
  user: 'your_user',
  password: 'your_password',
  database: 'your_database'
});

connection.connect(function(err) {
  if (err) throw err;
  console.log('Connected to MySQL server');
});


  1. Query the database using the SELECT statement:
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const query = 'SELECT COUNT(*) as count FROM your_table';

connection.query(query, function(err, results, fields) {
  if (err) throw err;
  
  // Access the scalar value
  const scalarValue = results[0].count;
  
  console.log('Scalar value:', scalarValue);
});


  1. End the database connection:
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connection.end(function(err) {
  if (err) throw err;
  console.log('Connection closed');
});


In this example, the query returns a single row with a single column (COUNT(*) as count). The scalar value is accessed using results[0].count where results is an array containing the returned rows.