想要更新MongoDB中的内部字段
要更新内部字段，请使用以下语法-
db.yourCollectionName.update({"_id" : yourObjectId},
{$set : {"yourOuterFieldName.yourInnerFieldName" :yourValue}});首先让我们创建一个包含文档的集合-
> db.updateDocumentDemo.insertOne(
... {
...
... "StudentDetails" : {
... "StudentFirstName" : "Adam",
... "StudentLastName" : "Samith"
... },
... "StudentOtherDetails" : {
... "StudentFavouriteSubject" : "MySQL",
... "StudentScore" : 45
... }
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd50bb32cba06f46efe9efe")
}以下是在find()方法的帮助下显示集合中所有文档的查询-
> db.updateDocumentDemo.find().pretty();
这将产生以下输出-
{
"_id" : ObjectId("5cd50bb32cba06f46efe9efe"),
"StudentDetails" : {
"StudentFirstName" : "Adam",
"StudentLastName" : "Samith"
},
"StudentOtherDetails" : {
"StudentFavouriteSubject" : "MySQL",
"StudentScore" : 45
}
}以下是更新MongoDB中文档的查询-
> db.updateDocumentDemo.update({"_id" : ObjectId("5cd50bb32cba06f46efe9efe")},
... {$set : {"StudentOtherDetails.StudentFavouriteSubject" :"MongoDB"}});
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })让我们再次显示文档-
> db.updateDocumentDemo.find().pretty();
这将产生以下输出-
{
"_id" : ObjectId("5cd50bb32cba06f46efe9efe"),
"StudentDetails" : {
"StudentFirstName" : "Adam",
"StudentLastName" : "Samith"
},
"StudentOtherDetails" : {
"StudentFavouriteSubject" : "MongoDB",
"StudentScore" : 45
}
}