Languages
[Edit]
EN

Node.js - PostgreSQL Select last row

0 points
Created by:
Lillie-Rose-Finnegan
339

In this article, we would like to show you how to select the last row in theΒ PostgresΒ database from Node.js level.

Node.js - PostgreSQL Select last row
Data used in the example - HeidiSQL

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

const { Client } = require('pg');

const client = new Client({
    host: '127.0.0.1',
    user: 'my_username',
    database: 'my_database',
    password: 'my_password',
    port: 5432,
});

const fetchLastRows = async (count) => {
	const query = `
            SELECT * FROM "users"
            ORDER BY "id" DESC
            LIMIT $1;
    `;
    await client.connect();   // creates connection
    try {
        const { rows } =  await client.query(query, [count]);  // sends query
        return rows;
    } finally {
        await client.end();   // closes connection
    }
};

fetchLastRows(1)  // get only 1 row from the end of the table
    .then(result => console.table(result))
    .catch(error => console.error(error.stack));

Result:Β 

β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”¬β”€β”€β”€β”€β”¬β”€β”€β”€β”€β”€β”€β”€β”¬β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”¬β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
β”‚ (index) β”‚ id β”‚ name  β”‚      email      β”‚  country  β”‚
β”œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”Όβ”€β”€β”€β”€β”Όβ”€β”€β”€β”€β”€β”€β”€β”Όβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”Όβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€
β”‚    0    β”‚ 7  β”‚ 'Nam' β”‚ 'nam@email.com' β”‚ 'Vietnam' β”‚
β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”΄β”€β”€β”€β”€β”΄β”€β”€β”€β”€β”€β”€β”€β”΄β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”΄β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜

Database preparation

create_tables.sqlΒ file:

CREATE TABLE "users" (
	"id" SERIAL,
	"name" VARCHAR(100) NOT NULL,
	"email" VARCHAR(100) NOT NULL,
	"country" VARCHAR(15) NOT NULL,
	PRIMARY KEY ("id")
);

insert_data.sqlΒ file:

INSERT INTO "users"
("name", "email", "country")
VALUES
('Tom', 'tom@email.com', 'Poland'),
('Chris', 'chris@email.com', 'Spain'),
('Jack', 'jack@email.com', 'Spain'),
('Kim', 'kim@email.com', 'Vietnam'),
('Marco', 'marco@email.com', 'Italy'),
('Kate', 'kate@email.com', 'Spain'),
('Nam', 'nam@email.com', 'Vietnam');

Native SQL query (used in the above example):

SELECT * FROM "users"
ORDER BY "id" DESC
LIMIT 1;
Donate to Dirask
Our content is created by volunteers - like Wikipedia. If you think, the things we do are good, donate us. Thanks!
Join to our subscribers to be up to date with content, news and offers.
Native Advertising
πŸš€
Get your tech brand or product in front of software developers.
For more information Contact us
Dirask - we help you to
solve coding problems.
Ask question.

β€οΈπŸ’» πŸ™‚

Join