MongoDB

The list specified by the current database in MongoDB can be a solid-state list, so-called solid state is the size determination, such as creating a solid-state collection: Db.createcollection ("The name of the solid state Collection",

Mongo System Database Introduction and permission settings. This article is only valid for mongo2.61 , and the commands in the lower version are slowly replaced or deprecated in the new version. For example, use db.adduser () in the mongo242

Today continue to learn about MongoDB's knowledge, mainly including the following for example:--find Specific explanations--Pagination and sorting-Cursors and other knowledge1. Specify the key to returnDb.person.find ({},{"_id": 0, "name": 1,

public class Mongodbhelper {//define MONGO service private mongoserver MONGO = NULL; get databasename corresponding database, do not exist automatically create private mongodatabase mongodatabase; //Mongo database connection/// public

This article is a serious example of the difficulties encountered in using MongoDB, and the reasons for eventually discarding MongoDB.Spent a lot of time to read, but have not carefully read the review, and so on which day is not busy, you can

One, delete replica set membersSpock:primary> rs.config ()    {              "_id"  :  "Spock",              "Version"  : 1,             "members " : [                     {                              "_id"  : 0,                              

Want to query MongoDB data through the shellMany people on the internet said that MongoDB does not support the shell, this statement I was basically agree;But the project needs, I have to try to do, the key to use--evalIf I want to query the number

MongoDB defaults to No access restrictionsNote: Windows-based platforms MongoDB after the native installation is well-deployed1. Enter the command: Show DBS, you will find it built with two databases, one named admin, one named Local. Local does not

Group BY query do not use the Java drive with the group by, to use the 2.2 version of the aggregate aggregation framework, after the test speed of one times fasterReferenceOfficial website:

1. Conditional operator= This operator does not have to explain more, the most commonly used is the simplestDb.collection.find ({"field": {$gt: Value}}); Greater than: field > ValueDb.collection.find ({"field": {$lt: Value}}); Less than: Field

Installing MongoDB First step: Download the installation package: official ← Click here, if the win system, note whether the 64-bit or 32-bit version, please select the correct version. Second step: Create a new directory "D:\MongoDB"

1. Inserting experimental dataLazy to use the samus,100 bar.1 for(inti =0; I -; i++)2 {3Document doc =NewDocument ();4doc["ID"] =i;5doc["MSG"] ="value is"+i;6 Mongocollection.insert (DOC);7}Insert Successful2.

MongoDB Replica Sets not only provides a high-availability solution, it also provides a load-balanced solution, increasing or decreasing Replica sets nodes in practical applications is very common, such as when the application of read pressure surge,

MongoDB under the Win7 only need to extract to the appropriate folder on the line, and then add to the Win7 path below, under the cmd command Open may not be able to actively deny the server, so choose to add to the Win7 service inside, the specific

LandingMONGO 192.168.0.134:27017 View GalleryShow DBS Building a libraryUse testDb.createcollections ("command") To view a table in a libraryShow collections; Insert statementDb.command.insert ({name: "SSH", decriptions: "This is login

Http://www.linuxask.com/questions/drop-a-database-in-mongodbDrop a database in MongoDBAnswer:Assuming you is going to drop the 'test' on MongoDB, follow the steps below to drop ( Delete) it.> use testswitched to db test> db.dropDatabase(){ "dropped"

This time we do campus video management system, the storage of video used to MongoDB. Compared to storing video in a disk or relational database,MongoDB stores data and reads more quickly. The following is a general introduction to the macro.MongoDB

 recently we have formed a team to usher in our BS a new project, Campus video management, mentions video, a lot of people have thought of MONGODDB , at that time very ignorant, do not know what to do, so go to see all kinds of information, think

1. Download MongoDBAddress: MongoDB,2. Decompression: TAR-ZXF linux-x86_64-2mongodb.6.6.tgzAfter decompression there will be a bin folder, which has a variety of executable programs, wherein MONGO indicates that MONGODB provides a shell terminal is

The normal collection in MongoDB is dynamic and can automatically grow to accommodate more data, whereas there is another set called a fixed set.(1) The fixed set needs to realize the explicit creation, the collection size is fixed;(2) Once the