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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

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(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

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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