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 ] }