为MongoDB排序字段值（名字）？
要对值排序，请sort()在MongoDB中使用。首先让我们创建一个包含文档的集合-
> db.demo365.insertOne({"FirstName":"Chris"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e57d5b6d0ada61456dc936f")
}
> db.demo365.insertOne({"FirstName":"Adam"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e57d5bad0ada61456dc9370")
}
> db.demo365.insertOne({"FirstName":"John"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e57d5bed0ada61456dc9371")
}
> db.demo365.insertOne({"FirstName":"Bob"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e57d5c0d0ada61456dc9372")
}在find()方法的帮助下显示集合中的所有文档-
> db.demo365.find();
这将产生以下输出-
{ "_id" : ObjectId("5e57d5b6d0ada61456dc936f"), "FirstName" : "Chris" }
{ "_id" : ObjectId("5e57d5bad0ada61456dc9370"), "FirstName" : "Adam" }
{ "_id" : ObjectId("5e57d5bed0ada61456dc9371"), "FirstName" : "John" }
{ "_id" : ObjectId("5e57d5c0d0ada61456dc9372"), "FirstName" : "Bob" }以下是排序查询-
> db.demo365.find().sort({"FirstName":1});这将产生以下输出-
{ "_id" : ObjectId("5e57d5bad0ada61456dc9370"), "FirstName" : "Adam" }
{ "_id" : ObjectId("5e57d5c0d0ada61456dc9372"), "FirstName" : "Bob" }
{ "_id" : ObjectId("5e57d5b6d0ada61456dc936f"), "FirstName" : "Chris" }
{ "_id" : ObjectId("5e57d5bed0ada61456dc9371"), "FirstName" : "John" }