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    The MongoDB class

    (PECL mongo >=0.9.0)

    Introducere

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

    Example #1 Selecting a database

    <?php

    $m     = new MongoClient(); // 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 "$".

    Sinopsisul clasei

    MongoDB {
    /* Constante */
    const int PROFILING_OFF = 0 ;
    const int PROFILING_SLOW = 1 ;
    const int PROFILING_ON = 2 ;
    /* Fields */
    public int $w = 1 ;
    public int $wtimeout = 10000 ;
    /* Metode */
    public authenticate ( string $username , string $password ) : array
    public command ( array $command , array $options = array() , string &$hash = ? ) : array
    public __construct ( MongoClient $conn , string $name )
    public createCollection ( string $name , array $options = ? ) : MongoCollection
    public createDBRef ( string $collection , mixed $document_or_id ) : array
    public drop ( ) : array
    public dropCollection ( mixed $coll ) : array
    public execute ( mixed $code , array $args = array() ) : array
    public forceError ( ) : bool
    public __get ( string $name ) : MongoCollection
    public getCollectionInfo ( array $options = array() ) : array
    public getCollectionNames ( array $options = array() ) : array
    public getDBRef ( array $ref ) : array
    public getGridFS ( string $prefix = "fs" ) : MongoGridFS
    public getProfilingLevel ( ) : int
    public getReadPreference ( ) : array
    public getSlaveOkay ( ) : bool
    public getWriteConcern ( ) : array
    public lastError ( ) : array
    public listCollections ( array $options = array() ) : array
    public prevError ( ) : array
    public repair ( bool $preserve_cloned_files = false , bool $backup_original_files = false ) : array
    public resetError ( ) : array
    public selectCollection ( string $name ) : MongoCollection
    public setProfilingLevel ( int $level ) : int
    public setReadPreference ( string $read_preference , array $tags = ? ) : bool
    public setSlaveOkay ( bool $ok = true ) : bool
    public setWriteConcern ( mixed $w , int $wtimeout = ? ) : bool
    public __toString ( ) : string
    }

    Constante predefinite

    MongoDB Log Levels

    MongoDB::PROFILING_OFF
    Profiling is off.
    MongoDB::PROFILING_SLOW
    Profiling is on for slow operations (>100 ms).
    MongoDB::PROFILING_ON
    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 need to adjust the acknowledgement level (MongoCollection::insert(), MongoCollection::update(), MongoCollection::remove(), MongoCollection::save(), and MongoCollection::ensureIndex() all support this option). With the default value (1), an acknowledged operation will return once the database server has the operation. If the server goes down before the operation has been replicated to a secondary, it is possible to lose the operation forever. Thus, you can specify w to be higher than one and guarantee that at least one secondary has the operation before it is considered successful.

    For example, if w is 2, the primary and one secondary 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 secondaries + primary, but then if one secondary is down the operation will fail and an exception will be thrown, so usually w=2 is safest (primary and one secondary).

    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.

    A se vedea și

    MongoDB core docs on » databases.

    Cuprins

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    User Contributed Notes 3 notes

    up
    6
    jeromakay at yahoo dot com
    13 years ago
    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
    up
    -1
    careddumattia at gmail dot com
    8 years ago
    mongo extension is deprecated.

    pecl install mongodb
    up
    -44
    m dot espositoii at yahoo dot com
    13 years ago
    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.
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