mongodb 如果存在，如何更新否则插入新文档？
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How to update if exists otherwise insert new document?
提问by PaolaJ.
How to update if exists otherwise insert new document in javascript/node.js? I am getting as parameter to function dictionary,if dictionary contains _id should update, otherwise insert on remote server (I have connection with remote server through mongoose and I have Person schema which I want to insert/update).
如何更新是否存在，否则在 javascript/node.js 中插入新文档？我正在获取函数字典的参数，如果字典包含 _id 应该更新，否则在远程服务器上插入（我通过 mongoose 与远程服务器连接，并且我有我想要插入/更新的 Person 模式）。
回答by EmptyArsenal
In Mongoose, you'd use Person.updateper the documentation. In order to create a document if it doesn't already exist, you need to pass { upsert : true }in the options hash as it defaults to false.
在 Mongoose 中，您将Person.update根据文档使用。如果文档不存在，为了创建文档，您需要传入{ upsert : true }选项哈希，因为它默认为false.
i.e.
IE
Person.update( { name : 'Ted' }, { name : 'Ted', age : 50 }, { upsert : true }, callback );
回答by Hrushikesh Dhumal
[db.collection.replaceOne(filter, replacement, options)]with upsert:true
[db.collection.replaceOne(filter, replacement, options)]和 upsert:true
E.g. from here:
例如从这里：
try { db.restaurant.replaceOne(
{ "name" : "Pizza Rat's Pizzaria" },
{ "_id": 4, "name" : "Pizza Rat's Pizzaria", "Borough" : "Manhattan", "violations" : 8 },
{ upsert: true }
);
}
catch (e){ print(e); }
回答by banderlog013
For python:
对于蟒蛇：
import pymongo
client = pymongo.MongoClient("mongodb_address")
db = client.db_name
collection = db[collection_name]
# update 'data' if 'name' exists otherwise insert new document
collection.find_one_and_update({"name": some_name},
{"$set": {"data": some_data}},
upsert=True)
