I just put a tableblob demo up in my PowerBuilder samples on my Google Drive.
This one is written in PB 12.5 Classic and uses a SQL Server database through an ADO.Net connection. The script needed to create the table is included in the sample. It does use a varbinary(max) column.
You will need to run the script to create the table and then edit the INI file for the sample so that the app can connect to your database.