amberpan / graphql

GraphQL with spring boot

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
    }
}