mongodb shell tutorial

. Autoindexid Boolean (optional) If true, the default value for the auto-create index _id field is false. Size Number Optionally, specify a maximum size byte capping set. If the cap is true, then you also need to specify this field. Max Number Optionally, specify the maximum number of files allowed in the capping collection. When inserting a document, the MongoDB fir

#!/bin/bash. Hellofunset"now going to thefuction Hello" hello# here will output the message:. /"back from thefunction Hello"6.6. function return Status valueExample 1:#!/bin/bashfunction Hello () { "Hello, today is ' date '" return 0 now going to thefunction Hellohello# next to output the return status value, with $? represents echo $? "back from thefunction Hello"Example 2: #!/bin/bashfunction Hello () {echo hello, today is ' date ' " return 0 }echo " now going to the functio

The Mongodb tutorial series is a distributed file storage-based database. Written in C ++. It is designed to provide scalable, high-performance data storage solutions for WEB applications. MongoDB is a product between relational databases and non-relational databases. It has the most abundant functions and features like relational databases.

This article is part of the Linux Shell Series Tutorial (vii), more shell tutorials See: Linux Shell Series Tutorials As with other languages, there are output operations in the shell, and in practical applications it is also very important to introduce the

This article is part of the Linux Shell Series Tutorial (10), more Linux shell tutorials: Linux Shell Tutorials Basically any language has its own looping statements, of course, the shell is no exception, today we introduce the use of

;. /init.d/mongodb /etc/rc4.d/s20mongodb->. /init.d/mongodb /etc/rc5.d/s20mongodb->. /init.d/mongodb You can also use Update-rc.d-f MongoDB removeReboot, through Ps-def | The grep mongod can view the service process from the start, and then you can turn the service off/start with the following command

": ObjectId (" 58e1d2f0bb1bbc3245fa754f ")," Name ":" User3 "," age ": +," sex ":" Woman "} >db.user.find (). Limit (1). Skip (1) {" _id ": ObjectId (" 58e1d2f0bb1bbc3245fa754d ")," name ":" User1 "," age ": +," sex ":" Man "} > The default value for the Skip () method is 0. > Db.user.find () {"_id": ObjectId ("58e1d2f0bb1bbc3245fa754b"), "name": "Liruihuan", "age": +, "sex": "Man"} {"_id": ObjectId ("58e1d2f0bb1bbc3245fa754d"), "name": "User1", "age": +, "sex": "Man"} {"_id": ObjectId ("5

MongoDBis a NoSQL database, there is no fixed pattern, that is, the same set of different document structure can be different, such as: the first record {name: "Xiaoming"}, the second record: {name: "Xiaoli", age:15}, which is not possible in the relational database. For MongoDB, Where: Collections is the collection of tables that are equivalent to relational databases, and document documents are equivalent to rows in a relational database. So that is

in $*do echo "$var"doneecho "print each param from \[emailprotected]"for var in [emailprotected]do echo "$var"doneecho "print each param from \"\$*\""for var in "$*"do echo "$var"doneecho "print each param from \"\[emailprotected]\""for var in "[emailprotected]"do echo "$var"doneRun./test. Sh "A" "B" "C" "D". The following result is displayed: $*= a b c d"$*"= a b c d[emailprotected]= a b c d"[emailprotected]"= a b c dprint each param from $*abcdprint each param from [emailprotect

Below we install the latest MongoDB 2.6.0 version on the CentOS 6.5 x64 system. The MongoDB v2.4.x version of the software warehouse has two packages: 1) mongo-10gen-serverThis package contains the latest version of the Mongod and MONGOs daemons and associated configuration and initialization scripts. 2) Mongo-10genThis package has all the MongoDB tools in the

Tags: Verify options note localhost crud pre type unique MonThis article focuses on installing the basic tutorial using Mongoose to let node. js operate MongoDB, front-end js+ back-end Node+js Operation MongoDB is the so-called most popular kind of JavaScript full stack development program, need friends can refer to the next Installing Mongoose To prepare a TESTM

Shell Script Series Tutorial Two: Start Shell programming2.1 How do I write a shell script?(1) The most common use of VI or mcedit to write shell scripts, but you can also use any of your favorite editor;(2) After the script is written, to set executable permissions for the

Tags: io ar strong SP data on CTI BS newSimilar to the normal relational database, when the data is deleted, changed, check, you will use the query conditions, such as the Where in MySQL ...In MongoDB, all the instructions that have been made by PHP are wrapped in arrays:Mongocollection::update ( array $criteria , array $newobj [, array $options = Array ()])Public Mongocursor Mongocollection::find ([ Array $query = array () [, Array $fields = Array ()

Recently in the study of MongoDB, online search found that the use of MongoDB in. NET article is either an early driver version, or very little information, so write an essay record, this article in detail to introduce to you. NET in the use of MongoDB method tutorial, the need for friends can reference, below to see t

to the firewall[[Email protected] mongodb]# service iptables restart//restart firewallConfigurationAdd CentOS Boot entry[Email protected] mongodb]# VI +/etc/rc.d/rc.localAppend the MongoDB Start command to this file:/usr/local/mongodb/bin/mongod--dbpath=/var/mongodb/data--l

1. Execute the specified statement with the eval parameterFor example, the number of records in the T1 table that needs to query the test library is as follows:[[email protected] bin]#./mongo testMongoDB Shell version:2.6.6Connecting To:test> Db.t1.count ();0>Execute the statement directly from the command line eval parameter:[[email protected] bin]#./mongo test--eval "Printjson (Db.t1.count ())"MongoDB

Use commandMongoDB use database_name is used to create a database. The command creates a new database and returns the existing database if it does not exist.Grammar:The basic syntax for the use DATABASE statement is as follows:Use database_nameExample:If you want to create a database name >use mydbswitched to DB mydb To check the currently selected database using command db>dbmydbIf you want to check the database list, use the command show DBS.>Show dbslocal 0.78125GB0.23012GB The databas

Drop () methodMongoDB's Db.collection.drop () is used to delete a collection from the database.Grammar:The basic syntax for the drop () command is as followsDB. Collection_name. Drop() Example:First, check the available collections in the database MyDB>use mydbswitched to db mydb>show Collectionsmycolmycollectionsystem. Indexesyiibai> Now delete the collection name mycollection>db. MyCollection. Drop()true> Check the list of collections in the database again>show Collectionsmy

, The interpreter (interpreter) needs to read the source code that we wrote and convert it to the target (object), which is then run by the computer. Because each execution of the program is more than the compilation process, so efficiency has decreased.The advantage of using scripting languages is that they are mostly run at a higher level than the compiled language and can easily handle objects such as files and directories, and the disadvantage is that they are often less efficient than compi

MongoDB Shell IntroductionMongoDB comes with a JavaScript shell that can interact with the MongoDB real column in the shell using the command line. The shell can perform administrative operations, check for operations such as runn