在 GraphQL 中对结果进行排序 （orderBy）

排序定义返回的记录序列，并支撑稳定的分页。 在 GraphQL 中，数据 API 生成器 （DAB） 在应用或应用firstafter之前使用orderBy参数对结果进行排序。 如果省略 orderBy，DAB 默认按主键排序（升序）。

转到 本文档的 REST 版本。

概述

使用模式

query {
  books(orderBy: { year: DESC, title: ASC }, first: 5) {
    items {
      id
      title
      year
    }
  }
}

概念 SQL

SELECT TOP (5)
  id,
  sku_title AS title,
  year
FROM dbo.books
ORDER BY year DESC, sku_title ASC, id ASC;

示例响应

{
  "data": {
    "books": {
      "items": [
        { "id": 7, "title": "Dune Messiah", "year": 1969 },
        { "id": 6, "title": "Dune", "year": 1965 },
        { "id": 3, "title": "Foundation", "year": 1951 },
        { "id": 1, "title": "I, Robot", "year": 1950 },
        { "id": 8, "title": "The Martian Chronicles", "year": 1950 }
      ]
    }
  }
}

字段行为

忽略字段的示例

query {
  books(orderBy: { title: null, id: DESC }) {
    items { id title }
  }
}

无效结构

GraphQL 禁止在内部orderBy使用逻辑运算符 （and， or） 。 例如，以下代码生成验证错误：

books(orderBy: { or: { id: ASC } })

使用变量的示例

query ($dir: OrderBy) {
  books(orderBy: { id: $dir }, first: 4) {
    items { id title }
  }
}

Variables

{ "dir": "DESC" }

相关配置

{
  "entities": {
    "Book": {
      "source": {
        "object": "dbo.books",
        "type": "table"
      },
      "mappings": {
        "sku_title": "title"
      }
    }
  }
}

示例配置

{
  "runtime": {
    "pagination": {
      "default-page-size": 100,
      "max-page-size": 100000
    }
  },
  "entities": {
    "Book": {
      "source": {
        "type": "table",
        "object": "dbo.books"
      },
      "mappings": {
        "sku_title": "title",
        "sku_price": "price"
      },
      "relationships": {
        "book_category": {
          "cardinality": "one",
          "target.entity": "Category",
          "source.fields": [ "category_id" ],
          "target.fields": [ "id" ]
        }
      }
    },
    "Category": {
      "source": {
        "type": "table",
        "object": "dbo.categories"
      },
      "relationships": {
        "category_books": {
          "cardinality": "many",
          "target.entity": "Book",
          "source.fields": [ "id" ],
          "target.fields": [ "category_id" ]
        }
      }
    }
  }
}

另请参阅