如何在MongoDB文档中的哈希上执行$ gt？
$gt表示大于，其中选择字段值大于指定值的那些文档。首先让我们创建一个包含文档的集合-
> db.performQueryDemo.insertOne({"PlayerDetails":{"PlayerScore":1000,"PlayerLevel":2},"PlayerName":"Chris"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd7eba41a844af18acdffa9")
}
> db.performQueryDemo.insertOne({"PlayerDetails":{"PlayerScore":0,"PlayerLevel":1},"PlayerName":"Robert"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd7ebbb1a844af18acdffaa")
}
> db.performQueryDemo.insertOne({"PlayerDetails":{"PlayerScore":-10,"PlayerLevel":0},"PlayerName":"Larry"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd7ebd41a844af18acdffab")
}
> db.performQueryDemo.insertOne({"PlayerDetails":{"PlayerScore":1,"PlayerLevel":1},"PlayerName":"David"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd7ebe31a844af18acdffac")
}以下是在find()方法的帮助下显示集合中所有文档的查询-
> db.performQueryDemo.find().pretty();
这将产生以下输出-
{
"_id" : ObjectId("5cd7eba41a844af18acdffa9"),
"PlayerDetails" : {
"PlayerScore" : 1000,
"PlayerLevel" : 2
},
"PlayerName" : "Chris"
}
{
"_id" : ObjectId("5cd7ebbb1a844af18acdffaa"),
"PlayerDetails" : {
"PlayerScore" : 0,
"PlayerLevel" : 1
},
"PlayerName" : "Robert"
}
{
"_id" : ObjectId("5cd7ebd41a844af18acdffab"),
"PlayerDetails" : {
"PlayerScore" : -10,
"PlayerLevel" : 0
},
"PlayerName" : "Larry"
}
{
"_id" : ObjectId("5cd7ebe31a844af18acdffac"),
"PlayerDetails" : {
"PlayerScore" : 1,
"PlayerLevel" : 1
},
"PlayerName" : "David"
}以下是对MongoDB文档中的哈希执行$gt的查询。在这里，我们将获得分数大于0的玩家的记录-
> db.performQueryDemo.find({"PlayerDetails.PlayerScore":{$gt:0}});这将产生以下输出-
{ "_id" : ObjectId("5cd7eba41a844af18acdffa9"), "PlayerDetails" : { "PlayerScore" : 1000, "PlayerLevel" : 2 }, "PlayerName" : "Chris" }
{ "_id" : ObjectId("5cd7ebe31a844af18acdffac"), "PlayerDetails" : { "PlayerScore" : 1, "PlayerLevel" : 1 }, "PlayerName" : "David" }