GraphQL 优势之处

一次查询，搞定需求

举个例子，Book对象有bookTypeId，那我想看对应的bookTypeName，bookType对应的summary咋办？

如果你用RESTful Api ，免不了要定制接口或者多次调用后端。

现在用上GraphQL,就是这么无情：

#查询语句
query add{
	book(bookId: 1){
    bookName
    author
    bookType{
      typeId
      typeName
      summary
    }
    wordNumbers
    cover
    clickTimes
    lastupdate
    createtime
  }
}
#结果
{
  "data": {
    "book": {
      "bookName": "斗战狂潮",
      "author": "骷髅精灵",
      "bookType": {
        "typeId": "48",
        "typeName": "修真文明",
        "summary": "修仙觅长生，热血任逍遥，踏莲曳波涤剑骨，凭虚御风塑圣魂！"
      },
      "wordNumbers": 2547900,
      "cover": "//qidian.qpic.cn/qdbimg/349573/1003694333/180",
      "clickTimes": 3,
      "lastupdate": "2018-02-23T00:00:00",
      "createtime": "2018-02-23T11:33:57"
    }
  }
}

sql语句？各种定制化接口？不存在的，一个GraphQL查询搞定，美滋滋。

继续来一发，排行榜表和作品表，排行榜表记录了book_id，前端展示只需这样：

query rank {
  rankList(rankTypeId: 1,first: 2) {
    edges {
      node {
        bookId
        book {
          bookName
          author
          wordNumbers
        }
        order
        rankTypeId
        createtime
      }
    }
  }
}
**自动根据节点id查询对应node信息，多帅哦**
{
  "data": {
    "rankList": {
      "edges": [
        {
          "node": {
            "bookId": 1,
            "book": {
              "bookName": "斗战狂潮",
              "author": "骷髅精灵",
              "wordNumbers": 2547900
            },
            "order": 1,
            "rankTypeId": 1,
            "createtime": "2018-02-24T00:28:37"
          }
        },
        {
          "node": {
            "bookId": 2,
            "book": {
              "bookName": "就问你气不气",
              "author": "秋刀斩鱼",
              "wordNumbers": 1736500
            },
            "order": 2,
            "rankTypeId": 1,
            "createtime": "2018-02-24T00:32:23"
          }
        }
      ]
    }
  }
}

这么写下来，GraphQL果然还是很不错的。。

上个链接GraphQL