This is a demonstration of how to layering GraphQL on top of existing infrastructure without rewriting any data layer. In this demonstration, you and me will build a simple GraphQL endpoint then try to layer it on top of several types of data access layer like Mysql DAL, ORM, Rest API, etc.

1. LAYERING GRAPHQL ON TOP OF
EXISTING INFRASTRUCTURE
Linh Phan
Senior Software Engineer
CodeComplete Vietnam

2. Today
● What is GraphQL?
● Layering GraphQL on top of existing infrastructure
● Demonstration

3. What is GraphQL?

4. Designed to build
Open sourced in 2015
Tool developed by

5. 01
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6. Query Language
a query language for your Database
a query language for your API

7. Describe your data Ask for what you want Get predictable results
TABLE users (
id int(10),
name varchar(255)
)
SELECT id, name
FROM users
WHERE id=1;
id name
1 “Iron Man”
type User {
id: String
name: String
}
query {
user(id: "1") {
id
name
}
}
"user": {
"id": "1",
"name": "Iron Man"
}
Query Language

8. Layering GraphQL on top of
Existing Infrastructure

9. GraphQL
MySQL
GraphQL
ORM
GraphQL
Rest API

10. Demonstration

11. References
● Demo source code
● Inspiring talk: Zero to GraphQL in 30 Minutes – Steven Luscher

12. Thank You!!!