mongodb shell tutorial

Open shell Start mongod -- dbpath d: \ app \ mongodata on the server first. Open shell: mongo localhost: 27017 By default, the test user operation is performed. You can use mongo localhost: 27017/admin to increase the permission. 1. Create a database Use [databaseName] However, if nothing is done, the empty database will be deleted. 2. view all databases Show dbs 3. Add a set to the specified database and

This article is part (iii) of the Linux Shell Series tutorial, more on the Shell Tutorial: Linux Shell Series Tutorials The shell is an advanced scripting class language and also supports custom variables. Today we will introd

Mongodb fuzzy query tutorial, mongodb fuzzy queryUse the RockMongo client tool for fuzzy search {"Content": "$ regex": "123456 "}Fuzzy search in other cases Query contains XXX {Name:/xxx /} Query starts with XXX {Name:/^ xxx /} Query ends with XXX {Name:/xxx ^ /} Case Insensitive Query {Name:/xxx/I} Case-insensitive fuzzy search in Spring // Completely

This article is part of the Linux Shell Series Tutorial (eight), more shell tutorials: Linux Shell Tutorials In previous: Linux Shell series Tutorial (vii) Shell output This article

Following the previous article, this article is mainly implemented by the C # version of Mongo map-Reduce. If you are not familiar with the C # driver, it doesn't matter. The MongoDB official website has a good getting started article, you will soon learn how to write the Mongo program in C #, instead of entering commands on the console every day. Getting StartedWith the CSHARP driver. Let's go back to the subject, II. C # version: 1. construct object

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 of users:#cat count_users.sh#！ /bin/sh/usr/bin/mongo xxx--quiet--authenticationdatabase admin-u root-p ' xyz '--eval

After running the repair I is able to start the Mongod proccessor and as root, which meant that service mongod start would isn't work. To repair this issue, I needed-make sure, the files inside the database folder were owned and grouped to Mongod . I did this by the following: Check the file permissions inside your database folder Note You need to is in your DBPath folder mine is /var/lib/mongo I went tocd /var/lib I-Ranls -l mongo This showed me-databases wer

time of the download, there is a rule that even "stable" (for example: 1.6.x,1.8.x), the base is "development" (for example: 1.7.x,1.9.x).2.2 InstallationAfter the download, after decompression, there will be three directories. The bin directory is a program file, and the other two directories are header and library files called by C + +. Here's what some of the program files in the bin directory do: Mongo.exe command-line client Tools Mongod.exe command-line service-side tools Mongodump.exe Da

Label:I. Data storage structure MongoDB storage data is divided into 3 layers. Dbs--collections--documents. At the bottom is documents, which stores data in JSON format. Collections is a dynamic collection of files that can be understood as a drawer for storing files. DBS is a database that can be understood as a bookcase composed of multiple drawers. Second, CRUD (creat, read, Updata, delete) operations 1. Create The Db.collection.insert () method i

This article is part (vi) of the Linux Shell Series tutorial, more on the Shell Tutorial: Linux Shell Series Tutorials The shell is very powerful in programming, its array function is also very perfect, today we introduce the

Shell Getting Started Tutorial (1)-shell Basics-JUSTKK's Column-Blog channel-csdn.nethttp://blog.csdn.net/justkk/article/details/43795131 Shell Getting Started Tutorial (2)-Variables and Parameters-JUSTKK's Column-Blog channel-csdn.nethttp://blog.csdn.net/justkk/article/deta

This article is part of the Linux Shell Series Tutorial (11), more Linux shell tutorials: Linux Shell Tutorials In the previous Linux Shell Series tutorial (10) Shell for loop, we h

MongoDB has not found a dedicated method to find the maximum value, but can be sorted and take the first one instead.The following collection data is as follows:{"_id": ObjectId ("54c39358acace71b1bd20a70"), "Epoch_min": Numberlong (1422030840), "Usage_ratio": 0.035140007734298706} {"_id": ObjectId ("54c39358acace71b1bd20a71"), "Epoch_min": Numberlong (1422030900), "Usage_ Ratio ": 0.025494230911135674} {" _id ": ObjectId (" 54c39358acace71b1bd20a72 "

: +}]}). Count (); 19. Sort by Salary ascending > Db.mycollection.find (). Sort ({salary:1}); Sort by salary word orderby order 20, descending > Db.mycollection.find (). Sort ({salary:-1}); Sort Descending by Salary field 21. Modify age According to username > db.employee.update ({username: ' jim '},{$set: {age:}},false,true); Db.collection.update (criteria, objnew, Upsert, Multi) Criteria:update query conditions, similar to those in the SQL update queryObjnew:update objects and some updated ope

The MONGO shell is a JavaScript interface used to connect MongoDB, providing users with the means to query and manipulate data in MongoDB, and to manage MongoDB. start and automatically connect to a MongoDB instance:The default installation in "/usr/bin/", with "which" com

Common mongodb shell > Use cmd_test // create a database switched to db cmd_test> db. createCollection ("test") // create a table is the collection {"OK": 1}> db. db. addUser (db. group (db. adminCommand (db. groupcmd (db. auth (db. groupeval (db. changeUserPassword (db. hasOwnProperty (db. cloneCollection (db. help (db. cloneDatabase (db. hostInfo (db. commandHelp (db. isMaster (db. constructor db. killOP

As mentioned above, the shell is a scripting language, so there must be an interpreter to execute the scripts.The common shell scripting interpreters on Unix/linux include bash, sh, csh, Ksh, and so on, which are used to call them a shell. We often say that there are many kinds of shells, actually speaking of shell scr

The Software Installation tool commonly used in Mac system is homebrew Personally, it is easier to install it through brew, as described below Install MongoDB wenxuezhangdemacbook-pro:~ wenxuezhang$ Brew Install MongoDB This figure shows that the installation was successful and the directory installed was/usr/local/cellar/mongodb/3.2.9 The first t