MongoDB Knowledge Summary

Agenda

• Traits

Agility,scalability,high-performancefree and Open-sourcenosql databasejson-likedocument-oriented database (schema Flexible)

• Document Database

A record in MongoDB was a document, which is a data structure composed of field and value pairs. MongoDB is similar to JSON objects.

• SQL to MongoDB Mapping Chart

The following table presents the various SQL terminology and concepts and the corresponding MongoDB terminology and CONCEP Ts.

• Connect to MongoDB

MongoDB default port is 27017, and the default local host is 127.0.0.1

Mongoclient MONGO

= new Mongoclient ("hostname", 27017);

DB db = Mongo.getdb ("Dataqueuenode");

Dbcollection collection = db.getcollection ("entity");

• MongoDB CRUD in Java

Basicdbobject query = new Basicdbobject ();

Query.put ("type", "s2f");

Query.put ("Subtype", "SQL Orders");

Query.put ("state", "disputed");

Query Document

Collection.findone (DBObject o); Search one specific record

Collection.find (DBObject o); Search all specific records

Remove Document

Collection.remove (DBObject o); Remove specific records

Insert Document

Collection.insert (DBObject arr); Insert Record

Modify Document

Collection.update (dbobject q, DBObject o); Update record

* @param q The selection criteria for the update

* @param o the modifications to apply

• MongoDB command

Reference
Doc:http://docs.mongodb.org/manual/core/crud-introduction

• One Shell for MongoDB

Mongovue

The condition operators in MongoDB are:

• (>) Greater than-$GT
• (<) less than-$lt
• (>=) greater than or equal to-$gte
• (<=) less than or equal to-$lte

>db.testtable.find ({age: {$gt: 22}})

MongoDB Knowledge Summary