Node.js - MySQL LIMIT

In this article, we would like to show you how to use SQL LIMIT in Node.js.

Note: at the end of this article you can find database preparation SQL queries, you will also find an example of a more parameterized query there.

const mysql = require('mysql');

const connection = mysql.createConnection({               // gets connection with database
    host: 'localhost',  // '127.0.0.1'
    user: 'root',
    password: 'password',
    database: 'database_name',
});

connection.connect((error) => {
    if (error) throw error;
    const query = 'SELECT * FROM `users` LIMIT ?';
    const value = 2;

    connection.query(query, [value], (error, result) => { // sends queries
        connection.end();                                 // closes connection 
        if (error) throw error;
        console.log(connection.sql);           // SELECT * FROM `users`
    });                                        // LIMIT 2
});

Output: 

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

With OFFSET:

const mysql = require('mysql');

const connection = mysql.createConnection({               // gets connection with database
    host: 'localhost',  // '127.0.0.1'
    user: 'root',
    password: 'password',
    database: 'database_name',
});

connection.connect((error) => {
    if (error) throw error;
    const query = 'SELECT * FROM `users` ' +
                  'LIMIT ? OFFSET ?';          // or shorter 'LIMIT 1, 2'
    const values = [2, 1];

    connection.query(query, values, (error, result) => {  // sends queries
        connection.end();                                 // closes connection 
        if (error) throw error;
        console.log(connection.sql);           // SELECT * 
    });                                        // FROM `users`
});                                            // LIMIT 2 OFFSET 1

Output: 

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

Database preparation

create_tables.sql file:

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:

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

 More parameterized query

// ...
connection.connect((error) => {
    if (error) throw error;
    const query = `SELECT * FROM ??
                   LIMIT ?`;
    const values = ['users', 2];

    connection.query(query, values, (error, result) => {  // sends queries
        connection.end();                                 // closes connection 
        if (error) throw error;
        console.log(connection.sql);           // SELECT * FROM `users`
    });                                        // LIMIT 2
});

The names of columns and tables can be placed in the query by a double question mark ??.