-
Run the following command to createa and start a Docker container with PostgreSQL, specifying the desired - - environmental variables and port:
sudo docker run --name postgres-0 -e POSTGRES_PASSWORD=password -d -p 5432:5432 postgres:alpine -
To view the running Docker images, use the following command:
sudo docker ps -
To view all images, including the running containers, use the following command:
sudo docker container ls -a -
If a container is stopped, you can start it using the following command:
sudo docker container start <container_id> -
If the port is already in use, you can find the process using the following command and kill it:
sudo lsof -i :5432 -
To run commands inside a prebuilt Docker container, use the following command:
docker exec -it <container_id> /bin/bash -
Inside the container, you can use psql to interact with PostgreSQL:
psql -U postgres -
You can display all users using the following command:
\du -
To list all databases, use the following command:
l -
To create a new database, use the following command:
create database <dbname>; -
To connect to a specific database, use the following command:
\c <dbname> -
To create a table, use the following command:
CREATE TABLE users ( id SERIAL PRIMARY KEY, name VARCHAR(255) NOT NULL, email VARCHAR(255) NOT NULL, age INTEGER NOT NULL ); -
To display a table structure, use the following command:
\d <table_name> -
To insert values into the table, use the following command:
insert into users(name, email, age) values ('Ayu', 'ayu@gmail.com', 22), ('Mayank raj', 'chikkuuu@gmail.com', 22); -
To display the data inside the table, use the following command:
select * from users;The output should look like this:
id | name | email | age
---+------------+-------------------+-----
3 | chikkuuu | chikkuuu@gmail.com| 22
1 | Ayu | ayu@gmail.com | 22
(2 rows)
To build a Node.js API using the Fastify framework and PostgreSQL as the database for user management, follow these steps:
Step 1: Set up the project
-
Create a new directory for your project.
-
Initialize a new Node.js project by running the following command in your project directory:
npm init -y -
Install the required dependencies: Fastify, pg, and any other necessary packages:
npm install fastify pg
Step 2: Set up the PostgreSQL database
- Install PostgreSQL on your machine if you haven't already.
- Create a new PostgreSQL database for your project.
Step 3: Create the API endpoints and database integration
Create a new file, e.g., index.js, and set up the basic structure of your Fastify server. Import the necessary modules:
const knex = require('knex')
module.exports = knex({
client: 'postgres',
connection: {
host: 'localhost',
user: 'postgres',
password: 'password',
database: 'test',
},
})