mongo shell commands

Error:couldn ' t connect to server 127.0.0.1:27017 src/mongo/shell/mongo.js Generally this is the case that you specify the database, so you cannot. Automatically load the service. The second time we can't connect. Each time before you start, manually, specify yourself, specify the database ha CMD under F:/mdb>mongod--dbpath f:/mdb/data the following figure It was successful to see the pict

Tags: log logs database operation record Ffline false data new Db.getcollection ('Product').Update({Status: "Offline"},{$Set: {status: "Online"}},false,true) update, change all status offline to online, note quotes db.collection.Update(criteria, objnew, Upsert, Multi) The description of the four parameters is as follows: The criteria:update query condition, similar to the Objnew:update object within the where in the SQL update query and some updated Operator (such as $, $inc ... ), and so on, c

::filesystem::create_directory:perm Ission denIED: "/tol/mongodb/data/_tmp/esort.1397502001.1410"Tue APR 03:00:01.672 [journal] in File::open ():: Open for '/tol/mongodb/data/journal/lsn ' failed with errno:13 Permiss Ion deniedTue APR 03:00:01.672 [Journal] warning:open of LSN file failed +++ View permissions, the discovery has become MySQL's [Root@localhost tol]# Ll-hTotal 28Kdrwx------2 MySQL MySQL 16K June 8 2013 Lost+foundDrwxr-xr-x 5 mysql MySQL 4.0K June 2013 MongoDBDrwxrwxr-x 3 mysql m

This problem always occurs when Ubuntu starts MONGO recently root@ubuntu:/var/lib/mongodb# MONGO MongoDB shell version:2.0.4 connecting to:test Tue 7 06:13:34 error:couldn ' t connect to server 127.0.0.1 shell/mongo.js:84 Exception:connect failed Online Check the following operation is completely resolved Find the

https://docs.mongodb.com/getting-started/shell/query/OverviewYou can use the find () method to issue a query to retrieve data from a collection in MongoDB.All queries in MongoDB has the scope of a single collection.Queries can return all documents with a collection or only the documents that match a specified filter or criteria.You can specify the filter or criteria in a document and pass as a parameter to the find () method.The find () method returns

After a short essay, the installation of MongoDB can be done after the most basic database operation, the following steps to achieve your Hello world!1. Open terminal Execution Brew services start MongoDB start MongoDB service, execute MONGO open shell operation;2. Show All DB: show dbs3. Enable a DB: Use mydb (if no mydb will automatically create this library)4. Display the table in the library:Show Tables

Help #mongodb支持的命令Show DBS #查看所有数据库Use testDB #查看当前连接在哪个数据库Show Collections #查看所有的collectionDb.help () #当前数据库支持哪些方法Db.user.help () #当前数据库下的表或者表collection支持的方法Db.foo.find () #查找所有Db.foo.findOne () #查找一条记录Db.foo.find ({' msg ': ' Hello 1 '}). Limit #根据条件检索10条记录Db.mail_addr.drop () #删除collectionDb.dropdatabase () #删除当前的数据库Db.foo.remove ({' yy ': 5}) #删除yy =5 recordsDb.foo.remove () #删除所有的记录#存储嵌套的对象Db.foo.save ({' name ': ' Ysz ', ' address ': {' city ': ' Beijing ', ' Post ': 100096}, ' phone ': [1

I. Shell special symbol, Cut command* Any character[Email protected] ~]# Ls/tmp/*.txt/tmp/1.txt/tmp/2.txt/tmp/q.txt[Email protected] ~]#？ Any one character[Email protected] ~]# Mkdir/tmp/test1[Email protected] ~]# Touch/tmp/test1[Email protected] ~]# ls-d/tmp/test?/tmp/test1[Email protected] ~]##注释字符[Email protected] ~]# sdx=233 #assa[Email protected] ~]# echo $SDX233[Email protected] ~]#\ de-Semantic characters[Email protected] ~]# ls-d test\*LS: Una

Shell translates into shell meaning, it is wrapped in the Linux kernel layer, a series of Linux commands can be issued to the operating system related instructions to the human-machine interface. The shell can combine a series of Linux commands with its conditional statement

Common Linux shell commands and shell commands I. Basic commands 1. Shut down immediately and restart again. Execute the following command: Shutdown-r now or reboot 2. Shut down immediately and execute the following command: Shutdown-h now or poweroff 3. Wait for two minutes

[Shell] basic Shell functions: Historical commands aliases, and basic shell functions Bytes -------------------------------------------------------------------------------------------------------- I. History commands 　　History# View historical

Some common Shell commands and common Shell commands Common system commands] Passwd [hostname]Change Password Useradd [hostname]Add User Su-Switch to the root user Ssh [hostname]Ssh connection Cd [directory]Go to the directory Sudo chown [username]Grant corresponding permiss

Execute shell commands and shell commands First, name the shell command as a. sh file. Save the above Code as test. sh and cd it to the corresponding directory: Chmod + x./test. sh # grant the script execution permission./test. sh # execute the scriptIf the error/bin/bash

Use shell commands to analyze statistics logs and shell commands to collect statistics logs When you need to collect user log information and analyze user behavior, you can use shell to conveniently retrieve a lot of data and place it in excel for statistics. For example, fo

; "title=" clip_image004 "border=" 0 "alt=" clip_ image004 "src=" http://s3.51cto.com/wyfs02/M01/75/15/wKioL1YyOLeSUc4-AABleG0dA6k987.jpg "height=" "/>"Shell script execution: Simply save the various Linux commands you normally use in order to a text file, and then add executable permissions, this file becomes a shell script! Ps:chmod +x target file650) this.widt

Note and execute shell commands for Mysql queries. mysql executes shell commands. Mysql query notes 1. when querying mysql, you must add the database prefix before the table. Otherwise, the database is the current database by default (when multiple databases are queried, duplicate queries may occur to the same table

Common commands and statements for Shell programming (SCRIPT) and Common commands for shellSome common Shell programming (SCRIPT) commands and statements can meet general requirements.Command Parameters received: Number of parameters: $ # Parameter value: Command itself

Summary of common shell commands and common shell commands Umask Set the default mode when creating a file. For a file, the maximum value is 6, and for a directory, the maximum value is 7.The system does not allow the creation of a text file to grant the executable permission, and the corresponding directory bit indi

8. find in shell commands and find in shell commands The find command, which is commonly used like cd. however, most of the time, one or two parameters are enough. or, barely enough. however, when we take the initiative to look at the find manual, we will find that the more practical functions are not used. This articl

1. shell script execution Method There are two ways to execute shell scripts. One is to generate a new shell and then execute the corresponding shell scripts. The other is to execute the shell in the current shell and no longer en