GraphQL API with Spring Boot

This sample application is developed to understand basic concepts of GraphQL. In memory H2 database was used for storage.

Learning Materials:

• https://graphql.org/learn/
• https://www.baeldung.com/spring-graphql

Queries

Query by employee ID

query {
   employee(employeeId: 1){
     firstName
   }
}

Query by first name

query {
    employeeByFirstName(firstName: "E"){
        employeeId
        firstName
        lastName
    }
}

Query with complex type(Adress)

query{
    employeeByFirstName(firstName: "E"){
        employeeId
        firstName
        lastName
        address{
            city
            state
            country
        }
    }

Query for city

query{
    city(city: "ABC"){
        city
        state
    }
}

Querying multiple types

query{
    employeeByFirstName(firstName: "E"){
        employeeId
        firstName
        lastName
        address{
            city
            state
            country
        }
    }
    
    city(city: "ABC"){
        city
        state
    }
}

---

Mutations

Add new employee

mutation{
    addEmployee(employeeId: 1, firstName: "G", lastName: "U", department: "WM"){
        firstName
    }
}

Subscriptions

URL: ws://localhost:8080/subscription

subscription NewEmployeeSubscription{
    newEmployee{
        employeeId
    }
}