✔️ Installing PostgreSQL
First, update the system software packages using the following command:
sudo apt update
and install the latest version of PostgreSQL from the default repositories.
sudo apt install postgresql
After intallation, you can confirm that PostgreSQL service is ative, running, enabled or ready to accept connections from clients using the following commands
sudo systemctl is-active postgresql
sudo systemctl is-enabled postgresql
sudo systemctl status postgresql
sudo pg_isready
✔️ Installing pgAdmin
pgAdmin is a management tool for PostgreSQL, but it's not available in the Ubuntu repositories, so we need to install it from the pgAdmin4 APT repository, add the public key and create the repository configuration file.
curl https://www.pgadmin.org/static/packages_pgadmin_org.pub
sudo apt-key add
sudo sh -c 'echo "deb https://ftp.postgresql.org/pub/pgadmin/pgadmin4/apt/$(lsb_release -cs) pgadmin4 main" > /etc/apt/sources.list.d/pgadmin4.list && apt update'
Then install,
sudo apt install pgadmin4
✔️ Installing NodeJs and node-postgres
node-postgres is a collection of node.js modules for interfacing with your PostgreSQL database
sudo apt install nodejs
sudo apt install npm
npm install pg
🔌 Connecting NodeJs with PostgreSQL
const { Pool } = require('pg');
const pool = new Pool({
user: 'lessa',
password: '88eb9394',
host: '/var/run/postgresql',
port: 5432,
database: 'service_management',
});
pool.on('error', (err, client) => {
console.error('Unexpected error on idle client', err)
process.exit(-1)
})
const startDatabase = (req, res, query, values) => {
pool.connect()
.then(client => {
return client.query(query, values)
.then(result => {
client.release();
res.status(200).send(result.rows)
})
.catch(err => {
client.release();
res.sendStatus(500);
})
})
}
🔻 Exemple of data manipulation using pg
const getCustomer = (req, res) => {
const customer = [req.params.name];
let query = 'SELECT * FROM customer WHERE deleted_date IS NULL'
if (customer) {
query += " AND name LIKE '%'||$1||'%'"
}
startDatabase(req, res, query, customer)
}
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