BLOB (Binary Large Object) is the data type of a column in an RDBMS table which can store large image or textual data as attributes.
This tutorial shows how to show the image stored in a database as BLOB in iReport.
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1. Environmental Systems Research Institute, Inc. , The GIS Glossary , http://www.geocities.com/mapref/terms/esri_gloss.html , Date Accessed 2nd December 2008