mongodb dbref

MongoDB dbref (Associative insert, query, delete) instance in depth, A,b,c three collection are interrelated. The number is the value of document.The introduction to Dbref can be seen http://blog.csdn.net/crazyjixiang/article/details/6616678 this

, A, B, and C collections are correlated. The number is the value of document. For more information about dbref, see the http://blog.csdn.net/crazyjixiang/article/details/6616678 article. Create a collection first. > var a={value:"1"}> var b={value:

Some time ago, the dbref in MongoDB was not very clear, and it was in a hurry because of time. Add a small experiment here.As MongoDB is non-relational (no joins), references ("Foreign keys") between parameters are generally resolved client-side by

Dbref:There are two ways to model MongoDB, one is inline (Embed), and the other is connection (link). Inline is a good understanding, that is, the field content is a group, the array contains the document, and we are today to introduce another,

"Database Commands""How the Command Works"The commands in MongoDB are actually implemented as a special type of query that is executed against the $cmd collection. RunCommand simply accepts the command document and executes the equivalent query, so>

This is a creation in Article, where the information may have evolved or changed. 2014-1-25 When you design a MONGO database, you encounter a problem where the log information table needs to reference the data from the people information table. If

@DBref The document association, when queried by that type, add the field name of the associated table to the field name, as follows:Criteria.where ("BlogGroup. $id"),$id represents the OID field of the associated table.OR and and union queriessuch

"Suzhou needs to work to add me QQ, the introduction of fee-splitting" MongoDB advanced1. Database commandsA. How the command worksDrop command to delete a collection in the shell and Execute Db.refactor.drop (). Actually, this function actually

Http://www.cnblogs.com/yoolonet/archive/2011/08/27/2155701.html A series of articles about MongoDB recently used MongoDB as a data storage system to record their own applications and problems in actual development. I hope this will be helpful to my

March 25 MongoDB (taken from "Humongous") 1.4 release shortly after its founder Dwight Merriman (formerly DoubleClick Ceo/cto) announced 10gen--open source document database MongoDB behind the company, It will provide business training and