Code Using GraphQL

import ballerina/graphql;
 
service /graphql on new graphql:Listener(9090) {
    resource function get hello() returns string {
        return "Hello, world!";
    }
}

// expose an existing data model with ASP.NET & EF Core
public class Startup {
  public void ConfigureServices(IServiceCollection services)
  {
      services.AddDbContext<DemoContext>();
      // Auto build a schema from DemoContext. Alternatively you can build one from scratch
      services.AddGraphQLSchema<DemoContext>(options =>
      {
          // modify the schema (add/remove fields or types), add other services
      });
  }
 
  public void Configure(IApplicationBuilder app, DemoContext db)
  {
      app.UseRouting();
      app.UseEndpoints(endpoints =>
      {
          // defaults to /graphql endpoint
          endpoints.MapGraphQL<DemoContext>();
      });
  }
}

using System;
using System.Threading.Tasks;
using GraphQL;
using GraphQL.Types;
using GraphQL.SystemTextJson; // First add PackageReference to GraphQL.SystemTextJson
 
public class Program
{
  public static async Task Main(string[] args)
  {
    var schema = Schema.For(@"
      type Query {
        hello: String
      }
    ");
 
    var json = await schema.ExecuteAsync(_ =>
    {
      _.Query = "{ hello }";
      _.Root = new { Hello = "Hello World!" };
    });
 
    Console.WriteLine(json);
  }
}

using Microsoft.AspNetCore;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Builder;
using Microsoft.Extensions.DependencyInjection;
 
WebHost
    .CreateDefaultBuilder(args)
    .ConfigureServices(services =>
        services
            .AddGraphQLServer()
            .AddQueryType<Query>())
    .Configure(builder =>
        builder
            .UseRouting()
            .UseEndpoints(e => e.MapGraphQL()))
    .Build()
    .Run();
 
public class Query
{
    public Hero GetHero() => new Hero();
}
 
public class Hero
{
    public string Name => "Luke Skywalker";
}

(require '[alumbra.core :as alumbra]
         '[claro.data :as data])
 
(def schema
  "type Person { name: String!, friends: [Person!]! }
   type QueryRoot { person(id: ID!): Person, me: Person! }
   schema { query: QueryRoot }")
 
(defrecord Person [id]
  data/Resolvable
  (resolve! [_ _]
    {:name    (str "Person #" id)
     :friends (map ->Person  (range (inc id) (+ id 3)))}))
 
(def QueryRoot
  {:person (map->Person {})
   :me     (map->Person {:id 0})})
 
(def app
  (alumbra/handler
    {:schema schema
     :query  QueryRoot}))
 
(defonce my-graphql-server
  (aleph.http/start-server #'app {:port 3000}))

$ curl -XPOST "http://0:3000" -H'Content-Type: application/json' -d'{
  "query": "{ me { name, friends { name } } }"
}'
{"data":{"me":{"name":"Person #0","friends":[{"name":"Person #1"},{"name":"Person #2"}]}}}

(def schema "type QueryRoot {
    hello: String
  }")
 
(defn resolver-fn [type-name field-name]
  (get-in {"QueryRoot" {"hello" (fn [context parent & rest]
                              "Hello world!")}}
          [type-name field-name]))
 
(require '[graphql-clj.executor :as executor])
 
(executor/execute nil schema resolver-fn "{ hello }")

package main

import "github.com/andrewwphillips/eggql"

func main() {
	http.Handle("/graphql", eggql.New(struct{ Message string }{Message: "hello, world"}))
	http.ListenAndServe(":80", nil)
}

$ curl -XPOST -d '{"query": "{ message }"}' localhost:80/graphql

{
  "data": {
    "message": "hello, world"
  }
}

# schema.gql
"""
A supernatural being considered divine and sacred
"""
type Deity {
  name: String!
  power: String @deprecated(reason: "no more supported")
}
type Query {
  deity(name: String! = "Morpheus"): Deity!
}

{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE DuplicateRecordFields #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE NamedFieldPuns #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeFamilies #-}
module API (api) where
import Data.ByteString.Lazy.Char8 (ByteString)
import Data.Morpheus (interpreter)
import Data.Morpheus.Document (importGQLDocument)
import Data.Morpheus.Types (RootResolver (..), Undefined (..))
import Data.Text (Text)
importGQLDocument "schema.gql"
rootResolver :: RootResolver IO () Query Undefined Undefined
rootResolver =
  RootResolver
    { queryResolver = Query {deity},
      mutationResolver = Undefined,
      subscriptionResolver = Undefined
    }
  where
    deity DeityArgs {name} =
      pure
        Deity
          { name = pure name,
            power = pure (Just "Shapeshifting")
          }
api :: ByteString -> IO ByteString
api = interpreter rootResolver

{-# LANGUAGE DataKinds #-}
{-# LANGUAGE NamedFieldPuns #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE PartialTypeSignatures #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
 
-- imports omitted for brevity...
 
graphql "Library" "library.graphql" -- all the magic happens here! 🪄🎩
 
-- ... a bit more code...
 
libraryServer :: SqlBackend -> ServerT ObjectMapping i Library ServerErrorIO _
libraryServer conn =
  resolver
    ( object @"Book"
        ( field @"id" bookId,
          field @"title" bookTitle,
          field @"author" bookAuthor,
          field @"imageUrl" bookImage
        ),
      object @"Author"
        ( field @"id" authorId,
          field @"name" authorName,
          field @"books" authorBooks
        ),
      object @"Query"
        ( method @"authors" allAuthors,
          method @"books" allBooks
        ),
      object @"Mutation"
        ( method @"newAuthor" newAuthor,
          method @"newBook" newBook
        ),
      object @"Subscription"
        (method @"allBooks" allBooksConduit)
    )
  where
    bookId :: Entity Book -> ServerErrorIO Integer
    bookId (Entity (BookKey k) _) = pure $ toInteger k
    -- ... more resolvers...

query basicMapValue($userIds: [Int]) {
  userInfoList(userIds: $userIds) {
    id
    age
    firstName
    lastName
    fullName: stringHolder @map(mapper: "firstName + lastName")
  }
}
 
query filterUserByAge($userId: [Int]) {
  userInfoList(userIds: $userId) @filter(predicate: "age>=18") {
    userId
    age
    firstName
    lastName
  }
}
 
query parseFetchedValueToAnotherFieldArgumentMap($itemIds: [Int]) {
  itemList(itemIds: $itemIds) {
    # save sellerId as List<Long> with unique name "sellerIdList"
    sellerId @fetchSource(name: "sellerIdList")
    name
    saleAmount
    salePrice
  }
 
  userInfoList(userIds: 1)
    # transform the argument of "userInfoList" named "userIds" according to expression "sellerIdList" and expression argument,
    # which mean replace userIds value by source named "sellerIdList"
    @argumentTransform(
      argumentName: "userIds"
      operateType: MAP
      expression: "sellerIdList"
      dependencySources: ["sellerIdList"]
    ) {
    userId
    name
    age
  }
}

import graphql.ExecutionResult;
import graphql.GraphQL;
import graphql.schema.GraphQLSchema;
import graphql.schema.StaticDataFetcher;
import graphql.schema.idl.RuntimeWiring;
import graphql.schema.idl.SchemaGenerator;
import graphql.schema.idl.SchemaParser;
import graphql.schema.idl.TypeDefinitionRegistry;
 
import static graphql.schema.idl.RuntimeWiring.newRuntimeWiring;
 
public class HelloWorld {
 
    public static void main(String[] args) {
        String schema = "type Query{hello: String}";
 
        SchemaParser schemaParser = new SchemaParser();
        TypeDefinitionRegistry typeDefinitionRegistry = schemaParser.parse(schema);
 
        RuntimeWiring runtimeWiring = newRuntimeWiring()
                .type("Query", builder -> builder.dataFetcher("hello", new StaticDataFetcher("world")))
                .build();
 
        SchemaGenerator schemaGenerator = new SchemaGenerator();
        GraphQLSchema graphQLSchema = schemaGenerator.makeExecutableSchema(typeDefinitionRegistry, runtimeWiring);
 
        GraphQL build = GraphQL.newGraphQL(graphQLSchema).build();
        ExecutionResult executionResult = build.execute("{hello}");
 
        System.out.println(executionResult.getData().toString());
        // Prints: {hello=world}
    }
}

// build.gradle.kts
implementation("com.expediagroup", "graphql-kotlin-spring-server", latestVersion)

graphql:
  packages:
    - "com.your.package"

@Component
class HelloWorldQuery : Query {
  fun helloWorld() = "Hello World!!!"
}

type Query {
  helloWorld: String!
}

data class Article(val id: Int, val text: String)
 
fun main() {
    val schema = KGraphQL.schema {
        query("article") {
            resolver { id: Int?, text: String ->
                Article(id ?: -1, text)
            }
        }
        type<Article> {
            property<String>("fullText") {
                resolver { article: Article ->
                    "${article.id}: ${article.text}"
                }
            }
        }
    }
 
    schema.execute("""
        {
            article(id: 5, text: "Hello World") {
                id
                fullText
            }
        }
    """).let(::println)
}

fun Application.module() {
  install(GraphQL) {
    playground = true
    schema {
      query("hello") {
        resolver { -> "World!" }
      }
    }
  }
}

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

npm install @apollo/server graphql

import { ApolloServer } from "@apollo/server"
import { startStandaloneServer } from "@apollo/server/standalone"
import { buildSchema } from "graphql"
 
const schema = buildSchema(`
   type Query {
      hello: String
   }
`)
 
const resolvers = {
  Query: {
    hello: () => "Hello World!",
  },
}
 
const server = new ApolloServer({
  typeDefs,
  resolvers,
})
 
const { url } = await startStandaloneServer(server)
 
console.log(`🚀 Server ready at ${url}`)

npm install @graphql-box/core @graphql-box/server @graphql-box/client @graphql-box/request-parser @graphql-box/cache-manager @graphql-box/debug-manager @graphql-box/execute @graphql-box/helpers @cachemap/core @cachemap/reaper @cachemap/redis @cachemap/constants @cachemap/types

import Cachemap from "@cachemap/core"
import redis from "@cachemap/redis"
import reaper from "@cachemap/reaper"
import CacheManager from "@graphql-box/cache-manager"
import Client from "@graphql-box/client"
import DebugManager from "@graphql-box/debug-manager"
import Execute from "@graphql-box/execute"
import RequestParser from "@graphql-box/request-parser"
import Server from "@graphql-box/server"
import { makeExecutableSchema } from "@graphql-tools/schema"
import { performance } from "perf_hooks"
import { schemaResolvers, schemaTypeDefs } from "./schema"
import logger from "./logger"
 
const schema = makeExecutableSchema({
  typeDefs: schemaTypeDefs,
  resolvers: schemaResolvers,
})
 
const server = new Server({
  client: new Client({
    cacheManager: new CacheManager({
      cache: new Cachemap({
        name: "server-cache",
        reaper: reaper({ interval: 300000 }),
        store: redis(/* configure */),
      }),
      cascadeCacheControl: true,
      typeCacheDirectives: {
        // Add any type specific cache control directives in the format:
        // TypeName: "public, max-age=3",
      },
    }),
    debugManager: new DebugManager({
      environment: "server",
      log: (...args) => {
        logger.log(...args)
      },
      name: "SERVER",
      performance,
    }),
    requestManager: new Execute({ schema }),
    requestParser: new RequestParser({ schema }),
  }),
})
 
// Meanwhile... somewhere else in your code
 
app.use("api/graphql", graphqlServer.request())

npm install graphql

var { graphql, buildSchema } = require("graphql")
 
var schema = buildSchema(`
  type Query {
    hello: String
  }
`)
 
var rootValue = { hello: () => "Hello world!" }
 
var source = "{ hello }"
 
graphql({ schema, source, rootValue }).then(response => {
  console.log(response)
})

npm install graphql-yoga graphql

import { createServer } from "http"
import { createSchema, createYoga } from "graphql-yoga"
 
createServer(
  createYoga({
    schema: createSchema({
      typeDefs: /* GraphQL */ `
        type Query {
          hello: String
        }
      `,
      resolvers: {
        Query: {
          hello: () => "Hello Hello Hello",
        },
      },
    }),
  }),
).listen(4000, () => {
  console.info("GraphQL Yoga is listening on http://localhost:4000/graphql")
})

npm install fastify mercurius

const Fastify = require("fastify")
const mercurius = require("mercurius")
 
const schema = `
  type Query {
    hello(name: String): String!
  }
`
 
const resolvers = {
  Query: {
    hello: async (_, { name }) => `hello ${name || "world"}`,
  },
}
 
const app = Fastify()
app.register(mercurius, {
  schema,
  resolvers,
})
 
app.listen(3000)
 
// Call IT!
// curl 'http://localhost:3000/graphql' \
//  -H 'content-type: application/json' \
//  --data-raw '{"query":"{ hello(name:\"Marcurius\") }" }'

npm create pylon@latest

import { app } from "@getcronit/pylon"
 
class User {
  name: string
  email: string
  constructor(name: string, email: string) {
    this.name = name
    this.email = email
  }
}
 
const users = [
  new User("Alice", "alice@example.com"),
  new User("Bob", "bob@example.com"),
  new User("Charlie", "charlie@example.com"),
]
 
export const graphql = {
  Query: {
    users,
    user: (name: string) => {
      return users.find(user => user.name === name)
    },
  },
  Mutation: {
    addUser: (name: string, email: string) => {
      const user = new User(name, email)
      users.push(user)
      return user
    },
  },
}
 
export default app

query User {
  user(name: "Alice") {
    name
    email
  }
}
 
query Users {
  users {
    name
    email
  }
}
 
mutation AddUser {
  addUser(name: "Corina", email: "corina@example.com") {
    name
    email
  }
}

<?php
 
namespace AppEntity;
 
use ApiPlatformCoreAnnotationApiResource;
use DoctrineORMMapping as ORM;
 
/**
 * Greet someone!
 *
 * @ApiResource
 * @ORMEntity
 */
class Greeting
{
    /**
     * @ORMId
     * @ORMColumn(type="guid")
     */
    public $id;
 
    /**
     * @var string Your nice message
     *
     * @ORMColumn
     */
    public $hello;
}

use Jerowork\GraphqlAttributeSchema\Attribute\Enum;
use Jerowork\GraphqlAttributeSchema\Attribute\Field;
use Jerowork\GraphqlAttributeSchema\Attribute\InputType;
use Jerowork\GraphqlAttributeSchema\Attribute\Mutation;
use Jerowork\GraphqlAttributeSchema\Attribute\Query;
use Jerowork\GraphqlAttributeSchema\Attribute\Type;
 
final readonly class CreateUserMutation
{
    #[Mutation]
    public function createUser(CreateUserInputType $input): User
    {
        // Business logic to create a user
    }
}
 
final readonly class UserQuery
{
    #[Query(description: 'Get a user')]
    public function user(int $userid): User
    {
        // Fetch and return user data
    }
}
 
#[InputType]
final readonly class CreateUserInputType
{
    public function __construct(
        #[Field]
        public int $userId,
        #[Field]
        public string $name,
        #[Field(name: 'phoneNumber')]
        public ?string $phone,
    ) {}
}
 
#[Type]
final readonly class User
{
    // Define fields as class properties
    public function __construct(
        #[Field]
        public int $userId,
        #[Field]
        public string $name,
        public ?string $phone,
        #[Field(description: 'The status of the user')]
        public UserStatusType $status,
    ) {}
 
    // Define fields with methods for additional logic
    #[Field]
    public function getPhoneNumber(): string
    {
        return sprintf('+31%s', $this->phone);
    }
}
 
#[Enum(description: 'The status of the user')]
enum UserStatusType: string
{
    case Created = 'CREATED';
    case Removed = 'REMOVED';
}

type Mutation {
  createUser(input: CreateUserInput!): User!
}
 
type Query {
  user(userId: Int!): User!
}
 
input CreateUserInput {
  userId: Int!
  name: String!
  phoneNumber: String
}
 
type User {
  userId: Int!
  name: String!
  status: UserStatus!
  phoneNumber: String
}
 
enum UserStatus {
  CREATED
  REMOVED
}

class ProductController
{
    /**
     * @Query()
     */
    public function product(string $id): Product
    {
        // Some code that looks for a product and returns it.
    }
}
 
/**
 * @Type()
 */
class Product
{
    /**
     * @Field()
     */
    public function getName(): string
    {
        return $this->name;
    }
    // ...
}

type Query {
  hello: String
}

<?php
declare(strict_types=1);
require_once '/path/to/vendor/autoload.php';
 
use SilerDiactoros;
use SilerGraphql;
use SilerHttp;
 
$typeDefs = file_get_contents(__DIR__.'/schema.graphql');
$resolvers = [
    'Query' => [
        'hello' => 'world',
    ],
];
$schema = Graphqlschema($typeDefs, $resolvers);
 
echo "Server running at http://127.0.0.1:8080";
 
Httpserver(Graphqlpsr7($schema), function (Throwable $err) {
    var_dump($err);
    return Diactorosjson([
        'error'   => true,
        'message' => $err->getMessage(),
    ]);
})()->run();

$ pip install ariadne

from ariadne import ObjectType, gql, make_executable_schema
from ariadne.asgi import GraphQL
 
type_defs = gql(
    """
    type Query {
        hello: String!
    }
    """
)
 
query_type = ObjectType("Query")
 
@query_type.field("hello")
def resolve_hello(*_):
    return "Hello world!"
 
schema = make_executable_schema(type_defs, query_type)
 
app = GraphQL(schema, debug=True)

$ pip install uvicorn
$ uvicorn example:app

pip install django-graphbox

django-admin startproject myproject

cd myproject
python manage.py startapp myapp

from django.db import models
 
class MyModel(models.Model):
    name = models.CharField(max_length=100)

python manage.py makemigrations
python manage.py migrate

from django_graphbox.builder import SchemaBuilder
from myapp.models import MyModel
 
builder = SchemaBuilder()
builder.add_model(MyModel)
 
query_class = builder.build_schema_query()
mutation_class = builder.build_schema_mutation()

import graphene
from myapp.schema import query_class, mutation_class
 
class Query(query_class, graphene.ObjectType):
    pass
 
class Mutation(mutation_class, graphene.ObjectType):
    pass
 
schema = graphene.Schema(query=Query, mutation=Mutation)

from django.urls import path
from graphene_file_upload.django import FileUploadGraphQLView
from django.views.decorators.csrf import csrf_exempt
from myproject.schema import schema
 
urlpatterns = [
    path('graphql/', csrf_exempt(FileUploadGraphQLView.as_view(graphiql=True, schema=schema))),
]

python manage.py runserver

pip install graphene-django-cruddals

from django.db import models
 
 
class Question(models.Model):
    question_text = models.CharField(max_length=200)
    pub_date = models.DateTimeField('date published')
    is_active = models.BooleanField(default=True)

from graphene_django_cruddals import DjangoModelCruddals
 
class CruddalsQuestion(DjangoModelCruddals):
    class Meta:
        model = Question

schema = CruddalsQuestion.Schema

class Query(
    # ... your others queries
    CruddalsQuestion.Query,
    graphene.ObjectType,
):
    pass
 
 
class Mutation(
    # ... your others mutations
    CruddalsQuestion.Mutation,
    graphene.ObjectType,
):
    pass
 
 
schema = graphene.Schema( query=Query, mutation=Mutation, )

pip install graphene

import graphene
 
class Query(graphene.ObjectType):
  hello = graphene.String(name=graphene.String(default_value="World"))
 
  def resolve_hello(self, info, name):
    return 'Hello ' + name
 
schema = graphene.Schema(query=Query)
result = schema.execute('{ hello }')
print(result.data['hello']) # "Hello World"

pip install strawberry-graphql

import strawberry
 
@strawberry.type
class Query:
    @strawberry.field
    def hello(self, name: str = "World") -> str:
        return f"Hello {name}"
 
schema = strawberry.Schema(query=Query)

pip install tartiflette

import asyncio
from tartiflette import Engine, Resolver
@Resolver("Query.hello")
async def resolver_hello(parent, args, ctx, info):
    return "hello " + args["name"]
async def run():
    tftt_engine = Engine("""
    type Query {
        hello(name: String): String
    }
    """)
    result = await tftt_engine.execute(
        query='query { hello(name: "Chuck") }'
    )
    print(result)
    # {'data': {'hello': 'hello Chuck'}}
if __name__ == "__main__":
    loop = asyncio.get_event_loop()
    loop.run_until_complete(run())

require 'agoo'
 
class Query
  def hello
    'hello'
  end
end
 
class Schema
  attr_reader :query
 
  def initialize
    @query = Query.new()
  end
end
 
Agoo::Server.init(6464, 'root', thread_count: 1, graphql: '/graphql')
Agoo::Server.start()
Agoo::GraphQL.schema(Schema.new) {
  Agoo::GraphQL.load(%^type Query { hello: String }^)
}
sleep
 
# To run this GraphQL example type the following then go to a browser and enter
# a URL of localhost:6464/graphql?query={hello}
#
# ruby hello.rb

gem install graphql

require 'graphql'
 
class QueryType < GraphQL::Schema::Object
  field :hello, String
 
  def hello
    "Hello world!"
  end
end
 
class Schema < GraphQL::Schema
  query QueryType
end
 
puts Schema.execute('{ hello }').to_json

require 'rails-graphql'
 
class GraphQL::AppSchema < GraphQL::Schema
  query_fields do
    field(:hello).resolve { 'Hello World!' }
  end
end
 
puts GraphQL::AppSchema.execute('{ hello }')

import caliban._
import caliban.schema.Schema.auto._
 
// schema
case class Query(hello: String)
 
// resolver
val resolver = RootResolver(Query("Hello world!"))
 
val api = graphQL(resolver)
 
for {
  interpreter <- api.interpreter
  result      <- interpreter.execute("{ hello }")
} yield result

import sangria.schema._
import sangria.execution._
import sangria.macros._
 
val QueryType = ObjectType("Query", fields[Unit, Unit](
  Field("hello", StringType, resolve = _ ⇒ "Hello world!")
))
 
val schema = Schema(QueryType)
 
val query = graphql"{ hello }"
 
Executor.execute(schema, query) map println

 use async_graphql::*;
 struct Query;
 #[Object]
 impl Query {
    /// Returns the sum of a and b
    async fn add(&self, a: i32, b: i32) -> i32 {
        a + b
    }
 }