---
title: Graphql Introduction
tags: Graphql
---
# GraphQL Introduction

https://graphql.org/

- GraphQL was developed to rebuild Facebook's native mobile applications.

- GraphQL is a query language. It provides a query in the form of a string that is sent to a server.

- The server interprets the query and then returns the result in the form of JSON format to the client.

## Advantages of GraphQL
Following is a list of major advantages of GraphQL:

1. GraphQL is faster

2. Best for complex systems and microservices

3. No over-fetching and under-fetching problems

4. Hierarchical Structure

5. Defines a data shape

6. Code-sharing

7. Strongly typed

8. Protocol, not a storage

9. Introspective

10. Latest version not required

## Disadvantages of GraphQL
Although GraphQL has negligible disadvantages over its advantages, we are giving some disadvantages here. Following is the list of disadvantages of GraphQL:

1. GraphQL Query Complexity

2. GraphQL Caching

3. GraphQL Rate Limiting

reference:
https://www.javatpoint.com/graphql-advantages-and-disadvantages
youtube:
https://www.youtube.com/watch?v=8D9XnnjFGMs&ab_channel=Fireship
https://www.youtube.com/watch?v=Y0lDGjwRYKw&ab_channel=TheNetNinja
中文youtube介紹：
https://www.youtube.com/watch?v=00NKSvAraLQ&ab_channel=Bo-YiWu

---

# (中文)GraphQL簡介

- 開發GraphQL是為了重建Facebook的本地移動應用程序。

- GraphQL是一種查詢語言。 它以字符串形式提供查詢，該查詢被發送到服務器。

- 服務器解釋查詢，然後將結果以JSON格式的形式返回給客戶端。

## GraphQL的優點
以下是GraphQL的主要優點：

1. GraphQL更快
2. 最適合複雜的系統和微服務
3. 沒有過度獲取和不足獲取的問題
4. 層次結構
5. 定義數據形狀
6. 代碼共享
7. 強類型
8. 協議，而不是存儲
9. 內省
10. 不需要最新版本

### 可以只抓自己要的資料 （包括mutation的回傳資料）

- querry, mutation,... 可指定request想要的值(欄位)

- 在 updateProfile 這個mutation執行時只回傳 id


## GraphQL的缺點

儘管GraphQL的優點比其缺點可以忽略不計，但在此我們給出了一些缺點。 以下是GraphQL的缺點列表：

1. GraphQL查詢複雜度
2. GraphQL緩存
3. GraphQL速率限制

---

# apolloJS

https://www.apollographql.com/

- 先打它想成一個用來幫助graphql開發的工具就好了

- Simplify app development by combining APIs, databases, and microservices into a single data graph that you can query with GraphQL