如何使用node.js将MySQL行转换为JSON响应？

我正在尝试为学校创建一个成绩表应用程序

我想显示教师在Angular web应用程序中输入的分数

我有一个像这样的MySQL表

+---------+-------------+--------------+-------+
| Roll_no |     Subject |    Category  | Marks |
+---------+-------------+--------------+-------+
|   1     |    English  |  HomeWork 1  |  10   |
|   1     |    English  |  HomeWork 2  |  10   |
|   1     |    Science  |  HomeWork 1  |  10   |
|   1     |    Science  |  HomeWork 2  |  10   |
|   2     |    English  |  HomeWork 1  |  10   |
|   2     |    English  |  HomeWork 2  |  10   |
|   2     |    Science  |  HomeWork 1  |  10   |
|   2     |    Science  |  HomeWork 2  |  10   |
+---------+-------------+--------------+-------+

[
 {
   "Roll_no" : 1,
   "Marks" : [
     {
       "English" : [ "HomeWork 1" : "10" , "HomeWork 2" : "10" ] ,
       "Science" : [ "HomeWork 1" : "10" , "HomeWork 2" : "10" ]
     }
 },
 {
   "Roll_no" : 2,
   "Marks" : [
     {
       "English" : [ "HomeWork 1" : "10" , "HomeWork 2" : "10" ] ,
       "Science" : [ "HomeWork 1" : "10" , "HomeWork 2" : "10" ]
     }
 }
]

如何将其转换为类似这样的JSON响应

+---------+-------------+--------------+-------+
| Roll_no |     Subject |    Category  | Marks |
+---------+-------------+--------------+-------+
|   1     |    English  |  HomeWork 1  |  10   |
|   1     |    English  |  HomeWork 2  |  10   |
|   1     |    Science  |  HomeWork 1  |  10   |
|   1     |    Science  |  HomeWork 2  |  10   |
|   2     |    English  |  HomeWork 1  |  10   |
|   2     |    English  |  HomeWork 2  |  10   |
|   2     |    Science  |  HomeWork 1  |  10   |
|   2     |    Science  |  HomeWork 2  |  10   |
+---------+-------------+--------------+-------+

[
 {
   "Roll_no" : 1,
   "Marks" : [
     {
       "English" : [ "HomeWork 1" : "10" , "HomeWork 2" : "10" ] ,
       "Science" : [ "HomeWork 1" : "10" , "HomeWork 2" : "10" ]
     }
 },
 {
   "Roll_no" : 2,
   "Marks" : [
     {
       "English" : [ "HomeWork 1" : "10" , "HomeWork 2" : "10" ] ,
       "Science" : [ "HomeWork 1" : "10" , "HomeWork 2" : "10" ]
     }
 }
]

使用SQL查询和node.js

我在用， node.jsv10.0 角度V7.0

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提前感谢。

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