mongodb upsert true

The upsert in mongodb and the update in multimongodb are like this: db. XXX. update (query, obj, upsert, multi); For upsert (false by default): If upserttrue is found, if the query finds rows that meet the conditions, modify these rows. If not,

The form of update in MongoDB is this:Db.collectionName.update (query, obj, Upsert, multi);For Upsert (False by default): If upsert=true, if query finds rows that match the criteria, the rows are modified, and if they are not found, a row is

The blog has moved Https://www.tianmingxing.com MongoDB is an open-source, document-oriented NoSQL (not only SQL) database written using C + +, and one of the most popular NoSQL databases. NoSQL Introduction NoSQL means "Not just SQL", is the

The atomicity of MongoDB upsert operation concurrency, mongodbupsert When C ++ is used to perform the update operation on MongoDB, if the upsert parameter is set to true, data that does not exist is automatically inserted. In a high concurrency

If you have never been familiar with MongoDB or have a little understanding of MongoDB, if you are a C # developer, take a few minutes to read this article. This article will take you step by step to get started easily. Read directory 1:

MONGO database update operation has a key feature relative to MySQL, it can use Upsert mode, when the updated data does not exist, directly inserted, but thinkphp MONGO driver actually does not support this feature, no way, self-reliance.thinkphp

To use MongoDB, You need to import the following classes, not all of which are required.Import com. MongoDB. Mongo;Import com. MongoDB. dB;Import com. MongoDB. dbcollection;Import com. MongoDB. basicdbobject;Import com. MongoDB. dbobject;Import com.

The three parameters of the MongoDB Update method are Upsert, which is a Boolean type and the default is False. When it is true, the Update method first finds the record that matches the first parameter, and when it is updated with the second

This article is just to record a few basic operations, first Upsert, there are several methods can be done, but all need to specify Updateoptions.upsert (true), the simplest method is as follows (Eqq is a filter to the Bson, For specific usage, see

When you perform an update operation on MongoDB in C + +, if the Upsert parameter is set to True, the nonexistent data is automatically inserted. In high concurrency environments, data duplication can result.The workaround is to add a unique index