MongoDB-将新文档插入现有文档
我正在学习MongoDB的一些基础知识。我有一份来自MongoDB教程的文档:MongoDB-将新文档插入现有文档,mongodb,Mongodb,我正在学习MongoDB的一些基础知识。我有一份来自MongoDB教程的文档: >db.post.insert([ { title: 'MongoDB Overview', description: 'MongoDB is no sql database', by: 'tutorials point', url: 'http://www.tutorialspoint.com', tags: ['mongodb', 'database', 'NoSQL'],
>db.post.insert([
{
title: 'MongoDB Overview',
description: 'MongoDB is no sql database',
by: 'tutorials point',
url: 'http://www.tutorialspoint.com',
tags: ['mongodb', 'database', 'NoSQL'],
likes: 100
},
{
title: 'NoSQL Database',
description: 'NoSQL database doesn't have tables',
by: 'tutorials point',
url: 'http://www.tutorialspoint.com',
tags: ['mongodb', 'database', 'NoSQL'],
likes: 20,
comments: [
{
user:'user1',
message: 'My first comment',
dateCreated: new Date(2013,11,10,2,35),
like: 0
}
]
}
])
如何在现有文档中插入新注释?谢谢使用
$push
操作符。请参阅mongo文档。您必须使用$push
db.coll.update({"title" : "NoSQL Database"},{$push:{"comments":{
"user":'user2',
"message": 'My second comment',
"dateCreated": new Date(2013,11,10,2,35),
"like": 0
}}})