mongodb shell tutorial

This is a bit missing from the previous article about running scripts with MongoDB's shell, which is now supplemented in this blog.One, passing in the script file on the command lineDefine a JAVASCIPRT file with the following name: Script1.js, for example:Print ("I am Albert Shao in the Script1.js")The definition also has a JavaScript file, named Script2, for example:Print ("I like to read and study")The following results are obtained for example in t

option.16. Added some development issues.1] Skip + limit page flip, the more slow the back, some materials say that using the array element paging can solve, not yetI tried it. The more reliable method is to first find the ID of the last time and do not use skip when turning pages:Last_row_id = objectid ('....');DB. activity_stream-> Find ({_ ID: {$ LT: last_row_id },User_id: 20}). Sort ({_ ID:-1}). Limit (10 );2]. select only the fields that are actually needed3]. When updating a piece of data

First, start the MongoDB shelltool, that is, bind the cmd.exe Common shell commands are as follows: 1. query the names of all local databases > show dbs; 2. Switch to the specified database environment (if no database is specified, a new database is created) > use dbtest; Switch to the dbtest database or create a database named dbtest.3. query all collection sets in the current database (equivalent to table

Tags: tags sed test data gray process localhost SSE localOne, the connection 1.mongo mongodb://localhost:27000 2. Show Databases (DBS) Use test 3. Db Show collections Second, insert 1.db.proccessedfile.insertone ({fileName: "20170403/3.gz", Processeddate:new isodate (), datanumber:10000, x:10}) 2.db.mongodb.insertmany ([{item: "Journal", Qty:25, Tags: ["blank", "red"], size: {h:14, w:21, UoM: "CM"}}, { Item: "Mat", qty:85, Tags: ["Gray"], size: {h:27.

In addition to the documentation in the MongoDB Manual, the MONGO Shell provides some additional information in I TS "Online" Help system. This document provides a overview of accessing this Help information.Command line HelpThe list of options and help for starting the MONGO shell with the --help option from the command LineMONGO--helpShell HelpTo see the list o

[MongoDB] uses shell in Mongodb to achieve dynamic interaction with javascript. mongodbshell The use of mongodb shell to execute scripts is a bit omitted in previous articles; now I will add a supplement to this blog;1. input the script file in the command line Define a java

to P Erform the sort before returning any results. As you iterate through the cursor and reach the end of the returned batch, if there is more results, cursor.next () would perform a getmore operation to retrieve the next batch. Many documents remain in the iterate the cursor, you can use the objsleftinbatch () method , as in the following example: var mycursor = Db.inventory.find (); var myfirstdocument = Mycursor.hasnext ()? Mycursor.next (): null; Mycursor.objsleftinbatch (); Cursor Info

This is a bit of an omission from previous articles about using MongoDB's shell to execute scripts, which is now supplemented in this blog post;One, passing in the script file on the command lineDefine a JAVASCIPRT file with the following name: Script1.js, as follows:Print ("I am Albert Shao in the Script1.js")Define another JavaScript file, named Script2, with the following content:Print ("I like to read and study")Running in the command window resul

. Such asMongoDB Background Management ShellOpen the Bin directory under the MongoDB installation directory and execute the Mongo.exe file, the MongoDB shell is the interactive JavaScript shell with MongoDB's own interactive environment for manipulating and managing MongoDB.Since it is a JavaScript

MongoDB BSON provides support for additional data types than JSON. Drivers provide native support for these data types in host languages and the MONGO Shell also provides several h Elper classes to support the use of these data types in the MONGO JavaScript Shell. See the Extended JSON Reference for additional information.TypesdateThe MONGO

tutorial to learn Unix/linux basics.The shell has two ways of executing commands: Interactive (Interactive): Explains the execution of a user's command, the user enters a command, and the shell interprets the execution of a single rule. Batch: The user writes a shell script in advance, with a number of co

This article is part of the Linux Shell Series Tutorial series, which includes the following 18 parts: Linux Shell Series Tutorial (a) Shell introduction Linux Shell Series Tutorial