mongodb sort natural

MongoDB Natural Sortnoun explanationNatural orderThe order in which the database references documents are stored on disk in this sort. This is the default sort order.ObjectIdA specific 12-byte Bson type that is used to guarantee uniqueness in the

/*** MongoDB $type operator*/ /*** The $type operator is based on the Bson type to retrieve the matching data type in the collection and returns the result.* The types of MongoDB that can be used are shown in the following table:* Type Number Notes*

MongoDB Quick Start1. MongoDB Introduction MongoDB is a cross-platform NoSQL document-type database that stores data in the form of Key_Value pairs. NoSQL (not only SQL) databases generally refer to non-relational databases.1.1 features of NoSQL

0) MONGO: Connect MongoDB database via client1) Show DBS---Display the currently created database2) Use test---Create or switch databases3) Db.dropdatabase ()--Delete the current database3) Show Collections: Displays the collection created by the

A.MongoDB features, features, usage scenariosMongoDB Installation and ConfigurationMongoDB ArchitectureDatabase start, stop, connectJson/bson data formatMongodb1. FeaturesData is in memory, written to disk through a background threadNon-modal

In general, we create a collection is no size, can be added to the inside of the document, the collection can be dynamically grown, there is a collection of MongoDB is called a fixed set, the size of the collection is fixed, I can be created when

"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>

"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

Learning MongoDB 6: MongoDB query (cursor operation, cursor information) (3), mongodb cursorI. Introduction Db. collection. find () can be used to query based on conditions and specify fields returned using the projection operator to omit this

Delete a collection in the shell, execute db.test.drop () or Db.runcommand ({"Drop": "Test"}), and the commands in MongoDB are actually implemented as a special type of query that executes against the $cmd collection, RunCommand simply accepts the