Question

我正在使用mongodb以下列方式存储时间序列数据

float a[60][7];
int row;
cout << "How many students would you like to grade?" << endl;

cin >> studentNum;

cout << "Enter grades for the first student" << endl;

row = 0;
n = studentNum - 2;

while (row < studentNum)
{
    a[row][0]=k;
    a[row][0] = row;
    cout << "Enter grade for test 1: ";
    cin >> a[row][1];
    cout << "Enter grade for test 2: ";
    cin >> a[row][2];
    cout << "Enter grade for test 3: ";
    cin >> a[row][3];
    cout << "Enter grade for test 4: ";
    cin >> a[row][4];



    a[row][5] = (a[row][1] + a[row][2] + a[row][3] + a[row][4]) / 4;
    a[row][6] = a[row][1] * 0.2 + a[row][2] * 0.3 + a[row][3] * 0.3 + a[row][4] * 0.2;

    row++;
}
if (row == n)
{
    cout << "Enter Grades for the last Student" << endl;
    cout << "Enter grade for test 1: ";
    cin >> a[row][1];
    cout << "Enter grade for test 2: ";
    cin >> a[row][2];
    cout << "Enter grade for test 3: ";
    cin >> a[row][3];
    cout << "Enter grade for test 4: ";
    cin >> a[row][4];
    break;
}
else
{ 
   cout << "Enter grades for the next student" << endl;
   row = row + 1;
}



cout << "Stdnt" << "\t" << "Grade1" << "\t" << "Grade2" << "\t" << "Grade3" << "\t" << "Grade4" << "\t" << "Avg1" << "\t" << "Avg2" << endl;
printarray(a, studentNum);

cin.get();
return 0;

但现在我想更新特定的范围值例如。我想将所有值设置为0大于 values.30.40 ，其中 VALUES是主节点，30是MINUTES，40是SECOND

Answer 1

是否可以将内部Json更改为数组？这样，您就可以使用索引访问和修改。当您在某些索引中没有值时，它也会有所帮助。

values: {
0:{[12,25,36,........,12]},
   .
   .
   .
}

如何使用节点js在mongodb中使用条件更新嵌套文档

1 个答案: