MongoDB samus driver avoid repeated addition

Source: Internet
Author: User

If samus is used as the CS driver of MongoDB, it has been very troublesome and uncomfortable to be unable to specify _ ID for a period of time.

Later I read an articleArticle:

Http://www.cnblogs.com/huangxincheng/archive/2012/03/09/2386054.html

Attribute can be added as described below:

[Same alias ("_ id")]

Public String mynewid {Get; set ;}

To specify the _ id

In version 2.4.3, an exception is thrown. You need to use the [producer id] for this task.

In this way, as long as our object mynewid is consistent, MongoDB will not add you again, but note that it will update you in the corresponding place!

For example:

Collections collection. Save (userinfo4 );

If the string userinfo4.mynewid already exists in the dB, the object in the DB will be overwritten by userinfo4.

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