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Node.js - MySQL Delete query

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Created by:

Emrys-Li

580

In this article, we would like to show you how to make an SQL Delete query in Node.js.

Note: at the end of this article you can find database preparation SQL queries.

1. DELETE query example

Edit

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const mysql = require('mysql');
​
const connection = mysql.createConnection({              // gets connection with database
    host: 'localhost', // '127.0.0.1'
    user: 'root',
    password: 'password',
    database: 'my_database',
});
​
connection.connect((error) => {
    if (error) throw error;
    const query = 'DELETE FROM `users` WHERE `name` = ?';
    const value = ['Denis'];
​
    connection.query(query, value, (error, result) => {  // sends queries
        connection.end();                                // closes connection
        if (error) throw error;
        console.log(result);
    });
});

Before:

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[
  { id: 1, name: 'John',  role: 'admin' },     
  { id: 2, name: 'Chris', role: 'moderator' },
  { id: 3, name: 'Kate',  role: 'user' },      
  { id: 4, name: 'Denis', role: 'moderator' } 
]

After:

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[
  { id: 1, name: 'John',  role: 'admin' },     
  { id: 2, name: 'Chris', role: 'moderator' },
  { id: 3, name: 'Kate',  role: 'user' }    
]

2. Database preparation

Edit

create_tables.sql file:

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CREATE TABLE `users` (
    `id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
    `name` VARCHAR(100) NOT NULL,
    `role` VARCHAR(15) NOT NULL,
    PRIMARY KEY (`id`)
)
ENGINE=InnoDB;

insert_data.sql file:

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INSERT INTO `users`
    (`name`, `role`)
VALUES
    ('John', 'admin'),
    ('Chris', 'moderator'),
    ('Kate', 'user'),
    ('Denis', 'moderator');