在MongoDB中更新整个文档（所有字段）的最快方法是什么？
最快的方法是replaceOne()在MongoDB中使用。让我们创建一个包含文档的集合-
> db.demo431.insertOne({"Name":"Chris","Age":32});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e770ba6bbc41e36cc3cae89")
}
> db.demo431.insertOne({"Name":"David","Age":31});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e770bacbbc41e36cc3cae8a")
}
> db.demo431.insertOne({"Name":"John","Age":24});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e770bb3bbc41e36cc3cae8b")
}
> db.demo431.insertOne({"Name":"Bob","Age":22});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e770bb8bbc41e36cc3cae8c")
}在find()方法的帮助下显示集合中的所有文档-
> db.demo431.find();
这将产生以下输出-
{ "_id" : ObjectId("5e770ba6bbc41e36cc3cae89"), "Name" : "Chris", "Age" : 32 }
{ "_id" : ObjectId("5e770bacbbc41e36cc3cae8a"), "Name" : "David", "Age" : 31 }
{ "_id" : ObjectId("5e770bb3bbc41e36cc3cae8b"), "Name" : "John", "Age" : 24 }
{ "_id" : ObjectId("5e770bb8bbc41e36cc3cae8c"), "Name" : "Bob", "Age" : 22 }以下是更新MongoDB中整个文档（所有字段）的查询-
> db.demo431.replaceOne(
... { "Name" : "John" },
... { "Name" : "Robert", "Age" :45 }
... );
{ "acknowledged" : true, "matchedCount" : 1, "modifiedCount" : 1 }在find()方法的帮助下显示集合中的所有文档-
> db.demo431.find();
这将产生以下输出-
{ "_id" : ObjectId("5e770ba6bbc41e36cc3cae89"), "Name" : "Chris", "Age" : 32 }
{ "_id" : ObjectId("5e770bacbbc41e36cc3cae8a"), "Name" : "David", "Age" : 31 }
{ "_id" : ObjectId("5e770bb3bbc41e36cc3cae8b"), "Name" : "Robert", "Age" : 45 }
{ "_id" : ObjectId("5e770bb8bbc41e36cc3cae8c"), "Name" : "Bob", "Age" : 22 }