pg_get_notify

    (PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)

    pg_get_notify — Gets SQL NOTIFY message

    Açıklama

    pg_get_notify(PgSql\Connection $connection, int $mode = PGSQL_ASSOC): array|false

    pg_get_notify() gets notifications generated by a NOTIFY SQL command. To receive notifications, the LISTEN SQL command must be issued.

    Bağımsız Değişkenler

    connection

    PostgreSQL veritabanı bağlantısı özkaynağı.

    mode

    Dizinin nasıl indisleneceğini belirleyen seçimlik bağımsız değişken. kip bir sabit olup şu değerleri alabilir: PGSQL_ASSOC, PGSQL_NUM ve PGSQL_BOTH. PGSQL_NUM ile işlev sayısal indisli bir dizi, PGSQL_ASSOC ile ilişkisel bir dizi ve PGSQL_BOTH ile hem sayısal hem de ilişkisel indisli bir dizi döndürür.

    Dönen Değerler

    An array containing the NOTIFY message name and backend PID. If supported by the server, the array also contains the server version and the payload. Otherwise if no NOTIFY is waiting, then false is returned.

    Sürüm Bilgisi

    Sürüm: Açıklama
    8.1.0 bağlantı bağımsız değişkeni artık PgSql\Connection nesnesi kabul ediyor, evvelce bir özkaynak kabul ederdi.

    Örnekler

    Örnek 1 PostgreSQL NOTIFY message

    <?php
    $conn     = pg_pconnect("dbname=publisher");
    if (!    $conn) {
    echo     "An error occurred.\n";
    exit;
    }

    // Listen 'author_updated' message from other processes
    pg_query($conn, 'LISTEN author_updated;');
    $notify = pg_get_notify($conn);
    if (!    $notify) {
    echo     "No messages\n";
    } else {
    print_r($notify);
    }
    ?>

    Ayrıca Bakınız

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    User Contributed Notes 2 notes

    up
    5
    glococo at gmail dot com
    7 years ago
    Instant yet Simple PHP notification with HTML5 Server-Sent Events

    sse.php
    <?php
    $dbconn     = new PDO("pgsql:host=localhost;dbname=mydb", "pduser", "userpass");
    $dbconn->exec('LISTEN "channel_name"'); // those doublequotes are very important

    header("X-Accel-Buffering: no"); // disable ngnix webServer buffering
    header("Content-Type: text/event-stream");
    header("Cache-Control: no-cache");
    ob_end_flush(); // close PHP output buffering
    $inc=0;

    while (    1) {
    $result = "";
    // wait for one Notify 10seconds instead of using sleep(10)
    $result = $dbconn->pgsqlGetNotify(PDO::FETCH_ASSOC, 10000);

    if (     $result ) {
    echo     "id: $inc\ndata: ".stripslashes(json_encode($result))."\n\n";
    $inc++;
    }

    flush();
    }
    ?>

    Tested with HTML+JS sample file from Mozilla web site (ssedemo.php)
    up
    0
    david at frankieandshadow dot com
    4 years ago
    It appears that pg_get_notify does not distinguish between no message waiting and a failure when checking - both seem to return FALSE.

    I had to add a pg_check_connection(...) before pg_get_notify to check the connection is still alive (it's quite likely to be a long-standing connection with pg_get_notify as you'll be polling waiting for something to happen). In my case the remote database server had a hiccup, and without pg_check_connection the listeners failed to notice, so never saw later notifications.
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