MongoDB::command

[edit] Last updated: Fri, 18 Sep 2009

The MongoDB class

Увод

Instances of this class are used to interact with a database. To get a database:

<?php
$m = new Mongo(); // connect
$db = $m->selectDB("example");
?>

Database names can use almost any character in the ASCII range. However, they cannot contain " ", "." or be the empty string.

A few unusual, but valid, database names: "null", "[x,y]", "3", "\"", "/".

Unlike collection names, database names may contain "$".

Синтаксис за класове

MongoDB

MongoDB {

/* Methods */

public array command ( array $data )

__construct ( Mongo $conn , string $name )

public MongoCollection createCollection ( string $name [, bool $capped = FALSE [, int $size = 0 [, int $max = 0 ]]] )

public array createDBRef ( mixed $ns , mixed $a )

public array drop ( void )

public array dropCollection ( mixed $coll )

public array execute ( mixed $code [, array $args = array() ] )

public bool forceError ( void )

public array getCursorInfo ( void )

public array getDBRef ( array $ref )

public MongoGridFS getGridFS ([ string $arg1 = "fs" [, string $arg2 = NULL ]] )

public int getProfilingLevel ( void )

public array lastError ( void )

public array listCollections ( void )

public array prevError ( void )

public array repair ([ bool $preserve_cloned_files = FALSE [, bool $backup_original_files = FALSE ]] )

public array resetError ( void )

public MongoCollection selectCollection ( string $name )

public int setProfilingLevel ( int $level )

public string __toString ( void )

}

Съдържание

MongoDB::command — Execute a database command
MongoDB::__construct — Creates a new database
MongoDB::createCollection — Creates a collection
MongoDB::createDBRef — Creates a database reference
MongoDB::drop — Drops this database
MongoDB::dropCollection — Drops a collection
MongoDB::execute — Runs JavaScript code on the database server.
MongoDB::forceError — Creates a database error
MongoDB::getCursorInfo — Gets information from the database about cursors
MongoDB::getDBRef — Fetches the document pointed to by a database reference
MongoDB::getGridFS — Fetches toolkit for dealing with files stored in this database
MongoDB::getProfilingLevel — Gets this database's profiling level
MongoDB::lastError — Check if there was an error on the most recent db operation performed
MongoDB::listCollections — Get a list of collections in this database
MongoDB::prevError — Checks for the last error thrown during a database operation
MongoDB::repair — Repairs and compacts this database
MongoDB::resetError — Clears any flagged errors on the database
MongoDB::selectCollection — Gets a collection
MongoDB::setProfilingLevel — Sets this database's profiling level
MongoDB::__toString — The name of this database

MongoDB::command

Mongo::__toString

[edit] Last updated: Fri, 18 Sep 2009

add a note User Contributed Notes MongoDB

m dot espositoii at yahoo dot com 27-Aug-2011 03:11


With Mongo it'll automatically create the collection, so just start using it and it'll do the creation itself.



In other words... just use SelectCollection, if it doesn't exist, it will after that so you can drop it.

jeromakay at yahoo dot com 20-Jan-2011 12:19


based on what I've read and then applied, you don't have to specifically create a database or table, you just initialize it. 



Indeed, files are not being written inside /data/db, but they will the first moment you start adding data.



So, I'm taking as an example Twitter, with no db defined, I'm still going to have the db available if I run this code:



<?php



define('TWITTER_API_VERSION', 1);



date_default_timezone_set("Europe/Dublin");



try 

{

    $m = new Mongo(); // connect

    $db = $m->selectDB("example");

}

catch ( MongoConnectionException $e ) 

{

    echo '<p>Couldn\'t connect to mongodb, is the "mongo" process running?</p>';

    exit();

}



$updates = file_get_contents( "http://api.twitter.com/". TWITTER_API_VERSION ."/statuses/public_timeline.json" );

$updates = json_decode( $updates );



if ( $updates && is_array( $updates ) && count( $updates ) )

{

    foreach ( $updates as $update )

    {    

        $db->users->insert( $update );

    }

}



?>



Hope this was helpful!



Good luck!

Vladimir Ghetau

jonwage at gmail dot com 01-May-2010 11:56


Just a note that if you use selectDB() and only select it, the database will not be created. In PHPMongoDBAdmin(http://github.com/jwage/php-mongodb-admin) I wanted a way to create a database through a form so I needed to create a dummy collection and drop it in order for the database to be created. MongoDB has a drop() method but no create() method.



<?php

$mongo->selectDB('db')->createCollection('__tmp_collection_');

$mongo->selectDB('db')->dropCollection('__tmp_collection_');

?>



Any better way to do this?

add a note