MongoDB-তে একাধিক শর্ত দ্বারা নেস্টেড অ্যারে জিজ্ঞাসা করুন

নেস্টেড অ্যারে জিজ্ঞাসা করতে, MongoDB-তে $elemMatch ব্যবহার করুন। আসুন নথি-

> db.demo203.insertOne({
...   "_id" : "101",
...   "Name" : "Chris",
...   "details1" : [
...      {
...         "empName" : "David",
...         "salary" : "50000",
...         "technology" : [
...            "MySQL",
...            "MongoDB"
...         ]
...      },
...      {
...         "empName" : "Carol",
...         "salary" : "70000",
...
...         "technology" : [
...            "Java",
...            "Spring"
...         ]
...      }
...   ]
...}
...);
{ "acknowledged" : true, "insertedId" : "101" }

Find() পদ্ধতি -

> db.demo203.find();

এটি নিম্নলিখিত আউটপুট −

{
   "_id" : "101", "Name" : "Chris", "details1" : [
      { "empName" : "David", "salary" : "50000", "technology" : [ "MySQL", "MongoDB" ] },
      { "empName" : "Carol", "salary" : "70000", "technology" : [ "Java", "Spring" ] } ]
}

এখানে একাধিক শর্ত −

> db.demo203.find(
...      {details1: { $elemMatch:{"technology" : "MySQL", "empName":"David"}}}
...   ).pretty()

এটি নিম্নলিখিত আউটপুট −

{
   "_id" : "101", "Name" : "Chris", "details1" : [
      { "empName" : "David", "salary" : "50000", "technology" : [ "MySQL", "MongoDB" ] },
      { "empName" : "Carol", "salary" : "70000", "technology" : [ "Java", "Spring" ] } ]
}