ibase_blob_get

(PHP 5, PHP 7 < 7.4.0)

ibase_blob_get — Get len bytes data from open blob

说明

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().

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

参数

blob_handle: A BLOB handle opened with ibase_blob_open().
len: Size of returned data.

返回值

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

范例

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.

参见

ibase_blob_open() - Open blob for retrieving data parts
ibase_blob_close() - Close blob
ibase_blob_echo() - Output blob contents to browser

User Contributed Notes

trinite at trinite dot mine dot nu 29-Dec-2005 03:33


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 ;)

hamacker 24-Nov-2004 06:03


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);  

?>

sol at nospam dot example dot com 18-Mar-2003 10:59


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; 

    }

}