Problem retrieving/updating data from InterBase

Hi, currently I'm working with an Interbase 6.0 database and I want to insert some text (and eventually a picture) to a blob field. I've found the following php code: $bid = ibase_blob_create(); ibase_blob_add($bid, "test"); $comments_blob = ibase_blob_close($bid); $sql = "UPDATE tblcontent SET Metadata=? WHERE id=1"; ibase_query($sql,$comments_blob); ibase_commit(); When I try to retrieve this blobdata, I use the following code: $set = ibase_query("SELECT Metadata FROM tblcontent WHERE ID = 1"); $row = ibase_fetch_object($set); $blob_id = ibase_blob_open($row->Metadata); $content = ibase_blob_get($blob_id); ibase_blob_close($blob_id); ibase_free_result($set); $content returns an empty string. I don't know if it goes wrong updating the data, or retrieving the data. Can anybody help me out here.... Thanks in advance.... Vincent