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Core Classes

<<Mongo::__toString

MongoDB::authenticate>>

UnterSeiten:

The MongoDB class

Einführung

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. The name "system" is also reserved.

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

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

Klassenbeschreibung

MongoDB {
/* Konstanten */
const int MongoDB::PROFILING_OFF = 0 ;
const int MongoDB::PROFILING_SLOW = 1 ;
const int MongoDB::PROFILING_ON = 2 ;
/* Fields */
public integer $w = 1 ;
public integer $wtimeout = 10000 ;
/* Methoden */
public array authenticate ( string $username , string $password )
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 ( string $collection , mixed $a )
public array drop ( void )
public array dropCollection ( mixed $coll )
public array execute ( mixed $code [, array $args = array() ] )
public bool forceError ( void )
public MongoCollection __get ( string $name )
public array getDBRef ( array $ref )
public MongoGridFS getGridFS ([ string $prefix = "fs" ] )
public int getProfilingLevel ( void )
public boolean getSlaveOkay ( 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 boolean setSlaveOkay ( boolean $ok )
public string __toString ( void )
}

Vordefinierte Konstanten

MongoDB Log Levels

MongoDB::PROFILING_OFF
0
Profiling is off.
MongoDB::PROFILING_SLOW
1
Profiling is on for slow operations (>100 ms).
MongoDB::PROFILING_ON
2
Profiling is on for all operations.

Fields

w
1

The number of servers to replicate a change to before returning success. Inherited by instances of MongoCollection derived from this. w functionality is only available in version 1.5.1+ of the MongoDB server and 1.0.8+ of the driver.

w is used whenever you perform a "safe" operation (MongoCollection::insert(), MongoCollection::update(), MongoCollection::remove(), MongoCollection::save(), and MongoCollection::ensureIndex() all support safe options). With the default value (1), a safe operation will return once the database server has the operation. If the server goes down before the operation has been replicated to a slave, it is possible to lose the operation forever. Thus, you can specify w to be higher than one and guarantee that at least one slave has the operation before it is considered successful.

For example, if w is 2, the main server and one slave must have a record of the operation or the driver will throw a MongoCursorException. It is tempting to set w to the total number of slaves + master, but then if one slave is down the op will fail and an exception will be thrown, so usually w=2 is safest (master+1 slave).

wtimeout
10000

The number of milliseconds to wait for MongoDB::$w replications to take place. Inherited by instances of MongoCollection derived from this. w functionality is only available in version 1.5.1+ of the MongoDB server and 1.0.8+ of the driver.

Unless wtimeout is set, the server waits forever for replicating to w servers to finish. The driver defaults to waiting for 10 seconds, you can change this value to alter its behavior.

Siehe auch

MongoDB core docs on » databases.

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jonwage at gmail dot com
1.05.2010 20:56
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?


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