Unions are used when we want a GraphQL field or list to handle multiple types of data. With a Union Type, we can define a field that could resolve completely different types of data. In this lesson, we will write a query that obtains a list of differ…

概述 REST作为一种现代网络应用非常流行的软件架构风格受到广大WEB开发者的喜爱,在目前软件架构设计模式中随处可见REST的身影,但是随着REST的流行与发展,它的一个最大的缺点开始暴露出来: 在很多时候客户端需要的数据往往在不同的地方具有相似性,但却又不尽相同. 如同样的用户信息,在有的场景下前端只需要用户的简要信息(名称.头像),在其他场景下又需要用户的详细信息.当这样的相似但又不同的地方多的时候,就需要开发更多的接口来满足前端的需要. 随着这样的场景越来越多,接口越来越多,文档越来越臃肿…

当使用ASP.NET MVC的Area功能时,出现了这样的错误: Multiple types were found that match the controller named 'Home'. This can happen if the route that services this request ('{controller}/{action}/{id}') does not specify namespaces to search for a controller that matc…

偶然的一个机会,修改了已经开发完毕的一个项目的命名.突然运行发现: { "Message": "An error has occurred.", "ExceptionMessage": "Multiple types were found that match the controller named 'Auth'. This can happen if the route that services this request ('ap…

前言   GraphQL 是一种用于 API 的查询语言,是由 Facebook 开源的一种用于提供数据查询服务的抽象框架.在服务端 API 开发中,很多时候定义一个接口返回的数据相对固定,因此要获得更多信息或者只想得到某部分信息时,基于 RESTful API 的接口就显得不那么灵活.而 GraphQL 对 API 中的数据提供了一套易于理解的完整描述,使得客户端能够准确地获得它需要的数据,而且没有任何冗余,也让 API 更容易地随着时间推移而演进,还能用于构建强大的开发者工具.   目前,L…

Interfaces are similar to Unions in that they provide a mechanism for dealing with different types of data. However, an interface is more suited for data types that include many of the same fields. In this lesson, we will query different types of pet…

In GraphQL, every field and nested object is able to take in arguments of varying types in order to do common operations like fetching an object by it's ID, filtering, sorting, and more. In this video, we'll update a field to take in an id argument a…

To query a GraphQL API, all you need to do is send an HTTP request that includes the query operation in the body of the request. In this lesson, we will use the browser’s fetch method to request the total days skied from our GraphQL API. const query…

When working with collections of things in GraphQL, we'll always reach out for the GraphQLListType. In this video, we'll learn how to use GraphQLList from the graphql package in combination with a GraphQLObject Type to create a field that returns a c…

catalog . SQLite简介 . Sqlite安装 . SQLite Programing . SQLite statements 1. SQLite简介 SQLite是一款轻型的数据库,是遵守ACID的关系型数据库管理系统,它包含在一个相对小的C库中.它是D.RichardHipp建立的公有领域项目.它的设计目标是嵌入式的,而且目前已经在很多嵌入式产品中使用了它,它占用资源非常的低,在嵌入式设备中,可能只需要几百K的内存就够了.它能够支持Windows/Linux/Unix等等主流的操…