SpringGraphQL

Gradle

İki proje var. 

1. Şöyle yaparız

implementation("org.springframework.boot:spring-boot-starter-graphql")

2. Şöyle yaparız. Kullanmayın

implementation("com.graphql-java-kickstart:graphql-spring-boot-starter:14.0.0")

SpringGraphQL anotasyonlara dayalı. Açıklaması şöyle

So instead of implementing GraphQLQueryResolver/GraphQLMutationResolver, we use @QueryMapping and @MutationMapping alongside with @Argument to resolve the method arguments. Also there is @SchemaMapping (@QueryMapping/@MutationMapping’s parent) which allows a method to act as the DataFetcher for a field from the schema mapping.  

@MutationMapping Anotasyonu

Örnek

Şöyle yaparız

@RestController
public class StudentController {

  private Map<String, Student> map = new HashMap<>();
  private AtomicInteger id = new AtomicInteger();

  @QueryMapping
  public Student getStudentById(@Argument String id) {
    return map.get(id);
  }

  @MutationMapping
  public Student addStudent(@Argument String name) {
    int id = this.id.incrementAndGet();
    Student student = new Student(String.valueOf(id), name);
    map.put(String.valueOf(id), student);
    return student;
  }

  @QueryMapping
  public List<Student> getStudents(){
    return new ArrayList<>(map.values());
  }
}

@QueryMapping Anotasyonu

Şu satırı dahil ederiz

import org.springframework.graphql.data.method.annotation.QueryMapping;

Örnek

Şöyle yaparız

@Controller
public class GreetingController {
  @QueryMapping //1
  public String hello() { //2
    return "Hello, world!";
  }
}

Açıklaması şöyle

1. Binds this method to a query, i.e. a field under the Query type

2. Determine the query from the method name if not declared on the annotation

DataFetcherExceptionResolver Arayüzü

Exception handling için gerekir. Açıklaması şöyle

DataFetcherExceptionResolver is an asynchronous contract. For most implementations, it would be sufficient to extend DataFetcherExceptionResolverAdapter and override one of its resolveToSingleError or resolveToMultipleErrors methods that resolve exceptions synchronously.

QuerydslPredicateExecutor Arayüzü

Şu satırı dahil ederiz

import org.springframework.data.querydsl.QuerydslPredicateExecutor;

Örnek

Şöyle yaparız

public interface AccountRepository extends Repository<Account,Long>,
  QuerydslPredicateExecutor<Account> {
}

Kullanmak için şöyle yaparız

//For single result queries
DataFetcher<Account> dataFetcher = 
  QuerydslDataFetcher.builder(repository).single();

//For multi-result queries
DataFetcher<Iterable<Account>> dataFetcher = 
  QuerydslDataFetcher.builder(repository).many();