MongoDB查询跳过前5条记录，仅显示最后5条记录
要跳过MongoDB中的记录，请使用skip()。这样，仅显示特定数量的记录，请使用limit()。
让我们创建一个包含文档的集合-
> db.demo275.insertOne({"Number":10});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e48eac4dd099650a5401a43")
}
> db.demo275.insertOne({"Number":12});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e48eac7dd099650a5401a44")
}
> db.demo275.insertOne({"Number":6});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e48eac9dd099650a5401a45")
}
> db.demo275.insertOne({"Number":1});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e48eacadd099650a5401a46")
}
> db.demo275.insertOne({"Number":5});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e48eacddd099650a5401a47")
}
> db.demo275.insertOne({"Number":24});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e48ead0dd099650a5401a48")
}
> db.demo275.insertOne({"Number":8});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e48ead6dd099650a5401a49")
}
> db.demo275.insertOne({"Number":9});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e48ead8dd099650a5401a4a")
}
> db.demo275.insertOne({"Number":19});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e48eadddd099650a5401a4b")
}
> db.demo275.insertOne({"Number":29});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e48eae1dd099650a5401a4c")
}在find()方法的帮助下显示集合中的所有文档-
> db.demo275.find();
这将产生以下输出-
{ "_id" : ObjectId("5e48eac4dd099650a5401a43"), "Number" : 10 }
{ "_id" : ObjectId("5e48eac7dd099650a5401a44"), "Number" : 12 }
{ "_id" : ObjectId("5e48eac9dd099650a5401a45"), "Number" : 6 }
{ "_id" : ObjectId("5e48eacadd099650a5401a46"), "Number" : 1 }
{ "_id" : ObjectId("5e48eacddd099650a5401a47"), "Number" : 5 }
{ "_id" : ObjectId("5e48ead0dd099650a5401a48"), "Number" : 24 }
{ "_id" : ObjectId("5e48ead6dd099650a5401a49"), "Number" : 8 }
{ "_id" : ObjectId("5e48ead8dd099650a5401a4a"), "Number" : 9 }
{ "_id" : ObjectId("5e48eadddd099650a5401a4b"), "Number" : 19 }
{ "_id" : ObjectId("5e48eae1dd099650a5401a4c"), "Number" : 29 }以下是查询以跳过前5条记录并仅显示它们的后5条记录-
> db.demo275.find().skip(5).limit(5)
这将产生以下输出-
{ "_id" : ObjectId("5e48ead0dd099650a5401a48"), "Number" : 24 }
{ "_id" : ObjectId("5e48ead6dd099650a5401a49"), "Number" : 8 }
{ "_id" : ObjectId("5e48ead8dd099650a5401a4a"), "Number" : 9 }
{ "_id" : ObjectId("5e48eadddd099650a5401a4b"), "Number" : 19 }
{ "_id" : ObjectId("5e48eae1dd099650a5401a4c"), "Number" : 29 }