Kbaran at 12:27, 6 November 2014

2014-11-06T12:27:17Z

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[[Category:MongDB]]

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<div class="noprint">
<slideshow style="nobleprog" headingmark="⌘" incmark="…" scaled="false" font="Trebuchet MS" >
;title: MongoDB - Basics
;author: <br/><br/>Kamil Baran kb@NobleProg.pl
</slideshow>
</div>
==Table of contents⌘==
<div id="s5slideshow-toc">
</div>

== Introduction ⌘==
* MongoDB is a document-oriented database
* replaces the concept of a "row" with a more flexible model, the "document"
* no predefined schemas

=== CRUD ⌘===
''' Create '''
<syntaxhighlight lang="JavaScript">
use NobleProg
person = {"Name":"Sean Connery", "Nationality":"Great Britain"}
db.people.insert(person)
</syntaxhighlight>

''' Read '''
<syntaxhighlight lang="JavaScript">
db.people.find()
db.people.findOne()
db.people.find().pretty()
</syntaxhighlight>

''' Update '''
<syntaxhighlight lang="JavaScript">
person.Occupation = "Actor"
db.people.update({"Name":"Sean Connery"}, person)
db.people.findOne()
</syntaxhighlight>

''' Delete '''
<syntaxhighlight lang="JavaScript">
db.people.remove({"Name":"Sean Connery"})
db.people.remove({})
db.people.findOne()
</syntaxhighlight>

== MongoDB Shell ⌘==
<syntaxhighlight lang="JavaScript">
$ mongo
MongoDB shell version: 2.6.4
connecting to: test
>

$ mongo HostName:PortNumber/DatabaseName
$ mongo localhost:27017/test

$ mongo --nodb
> conn = new Mongo("localhost:27017")
connection to localhost27017
> db = conn.getDB("NobleProg")
NobleProg
</syntaxhighlight>

=== Using help ⌘===
* mongo is a JavaScript shell, help is available in JavaScript on-line documentation
* use built-in help for MongoDB-specific functionality
* type function name without parentheses to see what the function is doing<br />

<syntaxhighlight lang="JavaScript">
> help
db.help() help on db methods
db.mycoll.help() help on collections methods
...
exit quit mongo shell
>
> db.NobleProg.stats
function ( scale ){
return this._db.runCommand( { collstats : this._shortName , scale : scale } );
}
>
> db.NobleProg.stats()
{ "ok" : 0, "errmsg" : "Collection [test.NobleProg] not found." }
>
</syntaxhighlight>

=== Running Scripts ⌘===
* mongo can execute JavaScript files
* scripts have access to all global variables (e.g. "db")
* shell helpers (e.g. "show collections") do not work from files
** use valid JavaScript equivalents (e.g. "db.getCollectionNames()")
* use load() to run script directly from Mongo Shell
* use .mongorc.js for frequently-loaded scripts
* startup options: --norc, --quiet

<syntaxhighlight lang="JavaScript">
$ mongo script.js
MongoDB shell version: 2.6.4
connecting to: test
script.js was executed successfully!
$ mongo --quiet script.js
script.js was executed successfully!
$ mongo
MongoDB shell version: 2.6.4
connecting to: test
> load(script.js)
script.js was executed successfully!
</syntaxhighlight>

MongoDB Basics - Revision history

Kbaran at 12:27, 6 November 2014