MongoDB查询所有数组项均小于指定条件？

首先让我们创建一个包含文档的集合-

> db.arrayElementsNotGreaterThanDemo.insertOne({"Scores":[89,43,32,45]});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5cd9e9f9b50a6c6dd317adb3")
}
> db.arrayElementsNotGreaterThanDemo.insertOne({"Scores":[32,33,34,40]});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5cd9ea13b50a6c6dd317adb4")
}
> db.arrayElementsNotGreaterThanDemo.insertOne({"Scores":[45,56,66,69]});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5cd9ea25b50a6c6dd317adb5")
}
> db.arrayElementsNotGreaterThanDemo.insertOne({"Scores":[46,66,77,88]});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5cd9ea3cb50a6c6dd317adb6")
}

以下是在find()方法的帮助下显示集合中所有文档的查询-

> db.arrayElementsNotGreaterThanDemo.find().pretty();

这将产生以下输出-

{
   "_id" : ObjectId("5cd9e9f9b50a6c6dd317adb3"),
   "Scores" : [
      89,
      43,
      32,
      45
   ]
}
{
   "_id" : ObjectId("5cd9ea13b50a6c6dd317adb4"),
   "Scores" : [
      32,
      33,
      34,
      40
   ]
}
{
   "_id" : ObjectId("5cd9ea25b50a6c6dd317adb5"),
   "Scores" : [
      45,
      56,
      66,
      69
   ]
}
{
   "_id" : ObjectId("5cd9ea3cb50a6c6dd317adb6"),
   "Scores" : [
      46,
      66,
      77,
      88
   ]
}

以下是所有数组项均小于指定条件的查询-

> db.arrayElementsNotGreaterThanDemo.find({Scores: {$not: {$gt:45}}});

这将产生以下输出-

{ "_id" : ObjectId("5cd9ea13b50a6c6dd317adb4"), "Scores" : [ 32, 33, 34, 40 ] }