This document provides an overview of GraphQL, including: - GraphQL allows clients to request multiple resources from a server in a single request. - It is not a JavaScript library but a query language that can be used with any database. - Many popular companies and organizations use GraphQL, including Facebook, GitHub, and The New York Times. - GraphQL supports features like queries, mutations, variables, aliases, and fragments. - Resources are provided to learn more about building scalable APIs with GraphQL.

1. Adem Yalçın tarafından Kariyer.net için hazırlandı (08/03/2018)

2. Think in Graphs, Not Endpoints

3. What is the GRAPHQL ?
• Open Source by Facebook (2015)
• Graphql is NOT JS Library
• Graphql is Query Language
• Can be used with any type of database
• Get multiple resource in a single Request
• Graphql between Client – Server different
relationship

6. REST GRAPHQL
CLIENT CLIENT
SQL MongoDb S3 SQL MongoDb S3

7. Supported Languages
• C# / .NET
• Elixir,
• Erlang
• Go,
• Java,
• Javascript / Node / Express
•PHP
•Phyton
•Scala
•Ruby
•Clojure

8. Who Use GraphQL ?

9. {
resume(id:1){
resumeName
lastUpdate
totalView
}
}
{
“resume”:{
resumeName:”Türkçe CV”
lastUpdate:”Today”
totalView:25
}
}

11. query Resumes{
resume{
resumeName,
totalView
}
}
mutation Update (id: Integer! ){
updateResumeDate (date: $date ){
lastUpdate
}
}
Query Operation
Mutation Operation

13. type RootQuery{
type ResumeType{
id:Int!;
fullName:String;
resumeName:String;
}
}
fullName:{
type:String;
resolve: obj =>{
`${obj.name} {obj.lastName}
}
}
GrahpQL Schema

14. GrahpQL Query Language
Fields Directives Fragments
Variables Aliases Mutations

15. query TestQuery{
graphQLHub
github{
user(username:"kullanıcı adı"){
id
company
avatar_url
repos{
name
}
}
}
}
FIELDS

16. query ListOfCommits{
github{
repo(name:"Repo Adı",ownerUserName:"Kullanıcı adı"){
commits{
message
date
}
}
}
}
FIELDS

17. query TestQuery{
github{
user(username:"kullanıcı adı"){
id
company
avatar_url
repos{
name
}
}
}
}
VARIABLE
query TestQuery($currentUserName : String!){
github{
user(username:$currentUserName){
id
company
avatar_url
repos{
name
}
}
}
}

18. ALIAES
query TestQuery($currentUserName : String!,$includeRepo:Boolean!){
github{
user(username:$currentUserName){
userId:id
company
avatar_url
repos @include(if:$includeRepo) {
name
}
}
}
}

19. “
FRAGMENTS
query TwoUsers($userName1:String!,$userName2:String!){
github{
user1:user(username:$userName1){
id
company
avatar_url
}
user2:user(username:$userName2){
id
company
avatar_url
}
}
}
query TwoUsers($userName1:String!,$userName2:String!){
github{
user1:user(username:$userName1){
...UserInfo
}
user2:user(username:$userName2){
...UserInfo
}
}
}
fragment UserInfo on GithubUser{
id
company
avatar_url
}

20. FRAGMENTS
{
github {
repo(name: "prophet", ownerUsername: "facebook") {
commits {
message
author {
... on GithubUser {
login
}
... on GithubCommitAuthor {
email
}
}
}
}
}
}

21. MUTATIONS
mutation {
addUser(firstName:"adem",lastName:"yalçın"){
fullName
}
}

22. t
Resources
Building Scalable APIs with GraphQL
http://devnot.com/2017/graphql-veri-erisiminde-yeni-bir-bakis-
acisi/
https://medium.com/@mkalyonc/s%C3%BCrekli-
duydu%C4%9Fum-bu-graphql-denen-%C5%9Fey-de-ne-
492e81fb48ca
https://www.youtube.com/watch?v=PEcJxkylcRM&list=PLillGF-
RfqbYZty73_PHBqKRDnv7ikh68

24. TEŞEKKÜRLER 