Introduction to GraphQL

Mar 23, 20210 likes63 views

GraphQL is a query language for your API, and a server-side runtime for executing queries by using a type system you define for your data.

Presented By:
Addi
Software Consultant
Introduction to
GraphQL

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Agenda
● Introduction to GraphQL
● Advantages over REST
● Schema
● Data Fetchers
●
● Demo

What is GraphQL?
● GraphQL is a query language for your API .
● “QL” stands for Query Language.
● GraphQL was developed internally by Facebook in 2012 before being
publicly released in 2015.

Disadvantages over REST
● Using Graphql in simple application is hectic.
● When we needs to query asking for a lot of fields and resources.
● schemas are static and the response the clients are going to get
depends on the schema definition and the query they make.

GraphQL Schema
● GraphQL API has a schema that defines each field that can be
queried(i.e, “payload”).
● It is not JSON (even though it looks deliberately similar), it is a GraphQL
schema.
● It defines each field that can be queried or mutated and what types
those fields are.

GraphQL Schema
type Query {
songById(id: ID): Song
}
type Song {
id: ID
name: String
genre: String
artist: Artist
}
type Artist {
id: ID
firstName: String
lastName: String
}

GraphQL Datafetchers
● Data Fetcher is probably the most important concept for a GraphQL.
● A Data Fetcher is used to fetch data when it is executed in query. And
whenever a query is executed GraphQL calls appropriate DataFetcher
to get the data.
● It is an interface with a single method, taking a single argument of
type.

Important Topics
● Graphql-java
● Db connection
● Runtime wiring

References
● https://www.graphql-java.com/documentation/v15/
● https://graphql.org/learn/
● https://graphql.org/code/#java

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Introduction to GraphQL

1. Presented By: Addi Software Consultant Introduction to GraphQL

2. Lack of etiquette and manners is a huge turn oﬀ. KnolX Etiquettes Punctuality Respect Knolx session timings, you are requested not to join sessions after a 5 minutes threshold post the session start time. Feedback Make sure to submit a constructive feedback for all sessions as it is very helpful for the presenter. Silent Mode Please keep your screen on mute, until it's necessary Avoid Distraction Be along with the presenter during the session and enjoy.

3. Agenda ● Introduction to GraphQL ● Advantages over REST ● Schema ● Data Fetchers ● ● Demo

4. What is GraphQL? ● GraphQL is a query language for your API . ● “QL” stands for Query Language. ● GraphQL was developed internally by Facebook in 2012 before being publicly released in 2015.

6. Disadvantages over REST ● Using Graphql in simple application is hectic. ● When we needs to query asking for a lot of fields and resources. ● schemas are static and the response the clients are going to get depends on the schema definition and the query they make.

7. GraphQL Schema ● GraphQL API has a schema that defines each field that can be queried(i.e, “payload”). ● It is not JSON (even though it looks deliberately similar), it is a GraphQL schema. ● It defines each field that can be queried or mutated and what types those fields are.

8. GraphQL Schema type Query { songById(id: ID): Song } type Song { id: ID name: String genre: String artist: Artist } type Artist { id: ID firstName: String lastName: String }

9. GraphQL Datafetchers ● Data Fetcher is probably the most important concept for a GraphQL. ● A Data Fetcher is used to fetch data when it is executed in query. And whenever a query is executed GraphQL calls appropriate DataFetcher to get the data. ● It is an interface with a single method, taking a single argument of type.

10. Important Topics ● Graphql-java ● Db connection ● Runtime wiring

11. DEMO

12. Q/A

13. References ● https://www.graphql-java.com/documentation/v15/ ● https://graphql.org/learn/ ● https://graphql.org/code/#java

14. Thank You !

Introduction to GraphQL

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