ibase_blob_get

(PHP 5, PHP 7)

ibase_blob_get — Get len bytes data from open blob

说明

string ibase_blob_get ( resource $blob_handle , int $len )

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

User Contributed Notes

trinite at trinite dot mine dot nu 29-Dec-2005 12:33
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 03:03
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 07:59
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;
    }
}