为堆积条形图转换 JSON 数组的数据结构

Question

这个问题与我之前提出的一个问题有关：Using JSON in d3v4 stacked bar chart。

背景：对于堆积条形图，我试图代表一系列医院，以显示每个患者的诊断所属的类别总数（对于每个医院）。我使用 SQL 查询生成了我的 JSON 文件并将其导出。

问题：如何更改我的 JSON 数组数据结构以组合同一家医院的多个类别？

堆积条形图的 JSON 数组数据结构（一小部分）如下所示：

[{
  "hospitalName": "hospital1",
  "category": "Injury & Poisoning",        
  "Females": "0",
  "Males": "4",
  "Unknown": "0",
  "count": "4"
},
{
  "hospitalName": "hospital1",
  "category": "Symptoms, Signs, & Ill-Defined Conditions",
  "Females": "1",
  "Males": "1",
  "Unknown": "0",
  "count": "2"
},
{
   "hospitalName": "hospital2",
   "category": "Mental Disorders",
    "Females": "0",
    "Males": "1",
    "Unknown": "0",
    "count": "1"
}]

所需的 JSON 数组数据结构：

[{
  "hospitalName": "hospital1",
  "Injury & Poisoning": "4",
  "Symptoms, Signs, & Ill-Defined Conditions": "2"        
  "Females": "1",  <--- the count of females is increased
  "Males": "5",    <--- the count of males is increased 
  "Unknown": "0",
  "count": "6"
},
{
   "hospitalName": "hospital2",
   "category": "Mental Disorders",
    "Females": "0",
    "Males": "1",
    "Unknown": "0",
    "count": "1"
}]

这是否可以使用 SQL 查询生成，或者我可以使用 PLSQL 代替吗？

Answer 1

只需使用与医院名称相同的键创建一个新字典。 然后从字典中检索所有元素。

如果您需要将计数作为字符串在将它们添加回数据列表之前将它们转换。

var newdata = {};

data.forEach(element => {
    var name = element.hospitalName;
    var hospital = newdata[name];
    if (!hospital) {
        hospital = { hospitalName: name, Females: 0, Males: 0, Unknown: 0, count: 0};
        newdata[name] = hospital;
    }
    hospital[element.category] = +element.count;
    hospital.Females += +element.Females;
    hospital.Males   += +element.Males;
    hospital.Unknown += +element.Unknown;
    hospital.count   += +element.count;
});

data = [];

for (const key in newdata) {
    if (newdata.hasOwnProperty(key)) {
        data.push(newdata[key]);
    }
}

作为您的巨大数据集的一个小型运行示例。

var data = [{
  "hospitalName": "hospital1",
  "category": "Injury & Poisoning",        
  "Females": "0",
  "Males": "4",
  "Unknown": "0",
  "count": "4"
},
{
  "hospitalName": "hospital1",
  "category": "Symptoms, Signs, & Ill-Defined Conditions",
  "Females": "1",
  "Males": "1",
  "Unknown": "0",
  "count": "2"
},
{
   "hospitalName": "hospital2",
   "category": "Mental Disorders",
    "Females": "0",
    "Males": "1",
    "Unknown": "0",
    "count": "1"
}];

var newdata = {};

data.forEach(element => {
    var name = element.hospitalName;
    var hospital = newdata[name];
    if (!hospital) {
        hospital = { hospitalName: name, Females: 0, Males: 0, Unknown: 0, count: 0};
        newdata[name] = hospital;
    }
    hospital[element.category] = +element.count;
    hospital.Females += +element.Females;
    hospital.Males   += +element.Males;
    hospital.Unknown += +element.Unknown;
    hospital.count   += +element.count;
});

data = [];

for (const key in newdata) {
    if (newdata.hasOwnProperty(key)) {
        data.push(newdata[key]);
    }
}

console.log(data);