sohelamin/graphql-postgres-go

A GraphQL complete example using Golang & PostgreSQL

GraphQL with Golang

A GraphQL complete example using Golang & PostgreSQL

Installation

Install the dependencies

go get github.com/graphql-go/graphql
go get github.com/graphql-go/handler
go get github.com/lib/pq

Install & create postgres database

brew install postgres
createuser graphql --createdb
createdb graphql -U graphql
psql graphql -U graphql

Note: Non-Mac users follow official doc to install the PostgreSQL

Create the tables

CREATE TABLE IF NOT EXISTS authors
(
    id serial PRIMARY KEY,
    name varchar(100) NOT NULL,
    email varchar(150) NOT NULL,
    created_at date
);

CREATE TABLE IF NOT EXISTS posts
(
    id serial PRIMARY KEY,
    title varchar(100) NOT NULL,
    content text NOT NULL,
    author_id int,
    created_at date
);

Usage

Query to get the all authors

query {
  authors {
    id
    name
    email
    created
  }
}

Query to get a specific author

query {
  author(id: 1) {
    id
    name
    email
  }
}

Create new author using mutation

mutation {
  createAuthor(name: "Sohel Amin", email: "sohelamincse@gmail.com") {
    id
    name
    email
  }
}

Update an author using mutation

mutation {
  updateAuthor(id: 2, name: "Sohel Amin Shah", email: "sohel@sohelamin.com") {
    id
    name
    email
  }
}

Delete an author using mutation

mutation {
  deleteAuthor(id: 2) {
    id
  }
}

Query to get the posts with its relation author

query {
  posts {
    id
    title
    content
    author {
      id
      name
      email
    }
  }
}