GraphQl nodejs code example

Example 1: postgresql nodejs

//connect to postgres database in node

const Pool = require('pg').Pool;

const pool = new Pool({
    user: '',
    host: 'localhost',
    database:  '',
    password: '',
    port:5432,
  })

//query example

app.get('/users',async(req,res)=>{
  
  try{
     let resp=await pool.query('SELECT * FROM users');
  }catch(err){
     res.status(200).send(resp.rows);
  }
})

Example 2: graphql install

npm install graphql --save

Example 3: GraphQl nodejs

type Query {
  info: String!
  feed(
    filter: String
    skip: Int
    take: Int
    orderBy: LinkOrderByInput
  ): Feed!
}

type Feed {
  id: ID!
  links: [Link!]!
  count: Int!
}

type Mutation {
  post(url: String!, description: String!): Link!
  signup(
    email: String!
    password: String!
    name: String!
  ): AuthPayload
  login(email: String!, password: String!): AuthPayload
  vote(linkId: ID!): Vote
}

type Subscription {
  newLink: Link
  newVote: Vote
}

type AuthPayload {
  token: String
  user: User
}

type User {
  id: ID!
  name: String!
  email: String!
  links: [Link!]!
}

type Link {
  id: ID!
  description: String!
  url: String!
  postedBy: User
  votes: [Vote!]!
  createdAt: DateTime!
}

type Vote {
  id: ID!
  link: Link!
  user: User!
}

input LinkOrderByInput {
  description: Sort
  url: Sort
  createdAt: Sort
}

enum Sort {
  asc
  desc
}

scalar DateTime

Example 4: postgresql nodejs

const { Client } = require('pg')const client = new Client();(async () => {  await client.connect()  const res = await client.query('SELECT $1::text as message', ['Hello world!'])  console.log(res.rows[0].message) // Hello world!  await client.end()})()