[sqlite] tcl blobs and incrblobs

As a (new) user I followed the advice looking at the tcl test examples to understand how to move text files to an sql database using blobs or incrblobs. Net result is I can't unerstand or do it. Please has someone got a tcl script(s) that loads and unloads files? - further perhaps reading

[sqlite] sqlite3 and incrblob

I'm having great difficulty using incrblob from tcl to a pre existingcre in the database blob as indicated at /www.sqlite.org/tclsqlite.html . I don't know where to get information on how to do it. My master table says I'e got such a blob definition and I've successfully inserted a record