PHP Unconference Europe 2015

ibase_blob_get

(PHP 4, PHP 5)

ibase_blob_getGet len bytes data from open blob

Description

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().

Parameters

blob_handle

A BLOB handle opened with ibase_blob_open().

len

Size of returned data.

Return Values

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

Examples

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.

See Also

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User Contributed Notes 3 notes

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1
hamacker
9 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); 
?>
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1
sol at nospam dot example dot com
11 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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0
trinite at trinite dot mine dot nu
8 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 ;)
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