在替换整个文档时如何更新MongoDB文档？
让我们首先用文档创建一个集合-
>db.replacingEntireDocumentDemo.insertOne({"StudentFirstName":"John","StudentLastName":"Smith","StudentCountryName":"US"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd3119bb64f4b851c3a13e8")
}以下是在find()方法的帮助下显示集合中文档的查询-
> db.replacingEntireDocumentDemo.find().pretty();
这将产生以下输出-
{
"_id" : ObjectId("5cd3119bb64f4b851c3a13e8"),
"StudentFirstName" : "John",
"StudentLastName" : "Smith",
"StudentCountryName" : "US"
}以下是在替换整个文档的同时更新MongoDB文档的查询-
>db.replacingEntireDocumentDemo.update({"StudentFirstName":"John","StudentLastName":"Smith","StudentCountryName":"US"}, {"StudentFirstName":"David","StudentLastName":"Miller","StudentCountryName":"AUS"});
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })让我们再次显示集合中的所有记录-
> db.replacingEntireDocumentDemo.find().pretty();
这将产生以下输出-
{
"_id" : ObjectId("5cd3119bb64f4b851c3a13e8"),
"StudentFirstName" : "David",
"StudentLastName" : "Miller",
"StudentCountryName" : "AUS"
}