graphql-server-complex-query-example

Example GraphQL Server for Complex Query

Installation

Run on terminal

git clone https://github.com/hscstudio/graphql-server-complex-query-example.git
cd grapql-server-complex-query-example
npm install
npm run dev

You will see below on terminal

> nodemon index.js

[nodemon] 2.0.7
[nodemon] to restart at any time, enter `rs`
[nodemon] watching path(s): *.*
[nodemon] watching extensions: js,mjs,json
[nodemon] starting `node index.js`
🚀 Server ready at http://localhost:4000/

Usage

Access GraphQL console http://localhost:4000

Input query:

{
  users {
    id
    username
    profile {
      name
      email
    }
    status
  }
}

Click run

Example Complex Query

Where

Find users where username equal def

{
  users(where: { username: { _eq: "def" } }) {
    id
    username
    profile {
      name
      email
    }
    status
  }
}

Result:

{
  "data": {
    "users": [
      {
        "id": 2,
        "username": "def",
        "profile": {
          "name": "Def",
          "email": "def@yahoo.com"
        },
        "status": true
      }
    ]
  }
}

Other query:

users(where: { profile__email: { _eq: "ghi@gmail.com" } })
users(where: { profile__email: { _like: "gmail" } })
products(where: { price: { _lte: 2000 } })
products(where: { _and: [{ price: { _lt: 5000 }}, { stock: { _gte: 10 }}] })
products(where: { _or: [{ price: { _lt: 5000 }}, { stock: { _gte: 10 }}] })
products(where: { price: { _between: [2000, 5000] } })

Available Operator

_eq: equal
_in: in_array
_like: like
_lt: lower than
_lte: lower than equal
_gt: greather than
_gte: greather than equal
_and: and
_or: or
_between: between

OrderBy

products(where: { price: { _between: [2000, 5000] } }, order_by: { id: desc })
users(order_by: { profile__name: desc })

Limit

products(where: { price: { _between: [2000, 5000] } }, order_by: { id: desc }, limit: 1)
users(limit: 3 )

Offset

products(limit: 2, offset: 1)

Customize Primary Key

Assumption: default field name for primary key is id, but You can change it.

users(pk: "username")

To Do

https://blog.logrocket.com/crud-with-node-graphql-react/ https://developer.okta.com/blog/2019/05/29/build-crud-nodejs-graphql

Limitation

Only support single primary key or not support composite key

Request Using Other Tools

Postman

Javascript Axios

var axios = require('axios');
var data = JSON.stringify({
  query: `{
  products(where: { price: { _lte: 2000 } }) {
    id
    title
    price
    status
  }
}`,
  variables: {}
});

var config = {
  method: 'post',
  url: 'http://localhost:4000',
  headers: { 
    'Content-Type': 'application/json'
  },
  data : data
};

axios(config)
.then(function (response) {
  console.log(JSON.stringify(response.data));
})
.catch(function (error) {
  console.log(error);
});

hscstudio / graphql-server-complex-query-example