Get_data_from_DB

+const config = require('./config')
+const mongoose = require("mongoose");
+const { range } = require("express/lib/request");
+const xlsx = require("xlsx");
+const fs = require('fs')
+
+
+
+const connect = mongoose.connect(config.url,
+  {
+    useNewUrlParser: true,
+    useUnifiedTopology: true,
+  })
+  .then(() => console.log("DB : Succesfully Connected"))
+  .catch((err) => console.log(err.message));
+
+
+var express = require('express');
+
+const { Subinfo } = require('./models/model');
+var request = require('request');
+
+
+var departmentinfo = '컴퓨터공학과'
+var gradeinfo = '2학년1학기'
+var name = []
+var time = []
+var prof = []
+
+Subinfo.find({ department: `${departmentinfo}`, grade: `${gradeinfo}` }).then((sub) => {
+  if (sub) {
+    for (var i in sub) {
+      if (sub[i]['choice'] == '필수') {
+        name.push(sub[i]['name'])
+
+        var random_num = (Math.floor(Math.random() * (sub[i]['subject'].length)))
+        sub[i]['subject'][random_num]['time']
+
+        if (time.length > 0) {
+          while (true) {
+            try {
+              var tmp = 0
+              var random_num = (Math.floor(Math.random() * (sub[i]['subject'].length)))
+
+              for (var j in time) {
+                if (time[j].slice(0, 13) == sub[i]['subject'][random_num]['time'].slice(0, 13)) {
+                  tmp = 1
+                  break
+                }
+              }
+              if (tmp == 0) {
+                break
+              }
+            }
+            catch (err) {
+              console.error(err);
+            }
+          }
+        }
+        time.push(sub[i]['subject'][random_num]['time'])
+        prof.push(sub[i]['subject'][random_num]['prof'])
+
+      }
+    }
+    console.log(name)
+    console.log(time)
+    console.log(prof)
+  }
+  else {
+    console.log(err)
+  }
+})
+
+//console.log(Math.floor(Math.random() * (10)))
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