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什么是GraphQL?这个词是什么意思? - Practical Tips

什么是GraphQL?这个词是什么意思?

by Mike

GraphQL是一种应用程序编程接口(API)查询语言。通过一次API调用,即可从多个数据源检索数据。

GraphQL:API查询语言

GraphQL是一种查询语言,也是使用HTTP的API的服务器端运行时。这些API向API客户端提供所需的数据。GraphQL的开发旨在使API快速、灵活且易于开发。

  • GraphQL中的“QL”代表“查询语言”。这种查询语言允许开发人员查询基础数据集,并控制GraphQL API响应的结构。
  • 借助GraphQL,API管理员可以添加或删除字段,而不会影响现有查询。此外,API可以根据您的想法创建。相应的GraphQL规范可确保API对客户端的行为具有可预测性。
  • 同时,可以在名为GraphiQL的集成开发环境(IDE)中实现GraphQL。
  • GraphQL使用HTTP POST通过HTTP请求正文或其查询参数发送查询。
  • 为了方便起见,GraphQL没有为每个底层资源设计单独的API路径,而是提供了一个URL,用户可以通过API客户端查询所需数据。您可以使用以下API端点URL向GraphQL API发出请求:http://example.com/graphql

GraphQL可能的应用领域

GraphQL为API提供商提供了一种向数据库提供API的标准化方法。这为API用户提供了通过通用网络基础设施的强大查询功能。

    • GraphQL 允许跨异构系统访问内容和数据。这是通过在后台为开发人员提供许多熟悉的数据库功能来实现的。这使得开发更具移动性,并更容易加速应用程序。
    • GraphQL的一个可能的应用领域是移动应用程序。如果你是一个需要优化应用程序速度和带宽的移动开发人员,GraphQL可以帮到你。
    •  该查询语言将多个请求合并为一个网络请求,以减少移动应用程序请求的总数。它还可以减少服务器返回响应的负载。这是因为只有移动应用程序实际使用的数据字段才会被传输。
    • 即使复杂的环境也可以通过GraphQL简化。例如,当您正在开发一个与数据库、旧系统和第三方供应商的API交互的应用程序时,就是这种情况。在这里,GraphQL可以降低复杂性,同时提高效率。

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