Graphql server - query example

Learn how to create a Graphql server using spring.

Prerequisites

• Java 17.

Run Locally

Execute following commands to build and run the Graphql server.

# Build project & install dependencies
./gradlew build

# Run project 
./gradlew bootRun

Testing

This project uses a H2 database that serves as a source for the Person object that will be exposed using Graphql, to include additional information to query you need to modify resources/data.sql file and include new INSERT statements.

By using a GraphQL client like Postman we will be able to query our API. GraphQl server endpoint will be available at http://localhost:8080/graphql .

Query examples:

• Query to obtain full Person object information

query personDetails {
  personById(id: 1) {
    id    
    name
    lastName
    gender
  }
}

• Query to obtain just some attributes of Person object.

query personDetails {
  personById(id: 1) {
    id    
    name
  }
}

And just like that we got only the attributes that we need from our API.