ibase_blob_get

    (PHP 5, PHP 7 < 7.4.0)

    ibase_blob_get — Get len bytes data from open blob

    Descrizione

    ibase_blob_get(resource $blob_handle, int $len): string

    This function returns at most len bytes from a BLOB that has been opened for reading by ibase_blob_open().

    Nota:

    It is not possible to read from a BLOB that has been opened for writing by ibase_blob_create().

    Elenco dei parametri

    blob_handle

    A BLOB handle opened with ibase_blob_open().

    len

    Size of returned data.

    Valori restituiti

    Returns at most len bytes from the BLOB, or false on failure.

    Esempi

    Example #1 ibase_blob_get() example

    <?php
    $result     = ibase_query("SELECT blob_value FROM table");
    $data = ibase_fetch_object($result);
    $blob_data = ibase_blob_info($data->BLOB_VALUE);
    $blob_hndl = ibase_blob_open($data->BLOB_VALUE);
    echo     ibase_blob_get($blob_hndl, $blob_data[0]);
    ?>
    Whilst this example doesn't do much more than a 'ibase_blob_echo($data->BLOB_VALUE)' would do, it does show you how to get information into a $variable to manipulate as you please.

    Vedere anche:

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    User Contributed Notes 3 notes

    up
    4
    hamacker
    19 years ago
    The first example is wrong, is missing ibase_blob_close() function.
    The correct example is :
    <?php
    $sql     = "SELECT blob_value FROM table";
    $result = ibase_query($sql);
    $data = ibase_fetch_object($result);
    $blob_data = ibase_blob_info($data->BLOB_VALUE);
    $blob_hndl = ibase_blob_open($data->BLOB_VALUE);
    print     ibase_blob_get($blob_hndl, $blob_data[0]);
    // without close blob conection, php and ibase_blob_get() do not run.
    ibase_blob_close($blob_hndl);
    ?>
    up
    1
    trinite at trinite dot mine dot nu
    18 years ago
    The ways mentioned above won't work with segmented blobs. To fix this, I use the following:
    (btw, $result->MFOTO is an image in the database)

    <?php
    $result     = ibase_fetch_object($result);

    /*
    ibase_blob_info array:
    [0] bloblength(total)
    [1] number of segments
    [2] size of largest segment
    [3] stream or segmented blob
    [4] ??
    */
    $blobinfo = ibase_blob_info($result->MFOTO);

    $blobhandle = ibase_blob_open($result->MFOTO);
    for(    $i = 0; $i < $blobinfo[1]; $i++){
    $readsize = $blobinfo[2];
    if(    $i == ($blobinfo[1] - 1)){
    $readsize = $blobinfo[0] - (($blobinfo[1] - 1) * $blobinfo[2]);
    }
    $totalimage .= ibase_blob_get($blobhandle, $readsize);
    }
    ibase_blob_close($blobhandle);
    echo     $totalimage;
    ?>

    This should do the trick ;)
    up
    0
    sol at nospam dot example dot com
    21 years ago
    I found examples like these:

    $sql = "SELECT ID, CONTENTTYPE, BLOBSIZE, DATA,NAME ";
    $sql.= " FROM OM_BLOB WHERE ID = 42";
    $result = ibase_query($sql);
    while ($row=ibase_fetch_object($result))
    {
    $blob_data = ibase_blob_info( $row->DATA);
    $blob_hndl = ibase_blob_open($row->DATA);
    $image = ibase_blob_get( $blob_hndl, $blob_data[0]);
    }
    but this won't work for large blobs.

    One solution for big blobs is to retrieve them by chunks:

    $sql = "SELECT ID, CONTENTTYPE, BLOBSIZE, DATA,NAME ";
    $sql.= " FROM OM_BLOB WHERE ID = 42";
    $result = ibase_query($sql);
    while ($row=ibase_fetch_object($result))
    {
    $image = ibase_blob_get($blob_hndl,8192);
    while($data = ibase_blob_get($blob_hndl, 8192)){
    $image .= $data;
    }
    }
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