If your RPG program is trying to retrieve data from an existing BLOB column, then you will want to use SQL locator or file reference variable.
If your RPG program is trying to get data out of a file into a BLOB column, you'll want to use a file Reference Variable.
There are locator and file reference examples in the "DB2 UDB for AS/400 Object Relational" Redbook.
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This was first published in December 2002