We have this database that where one of the feilds is going to be a
HUGE block of text, several megabytes. Right now we're saving that by
doing a simple

statement.execute(SQL) where SQL is a string that may be tens of
megabytes in length.   Not only do we need to load the SQL statement
into memory as a string, but somewhere along the line that string gets
copied, meaning we need to have twice as much memory as the data in the
file. (The database is on another machine)

I'm trying to shrink the memory requirements of our program, and this
is the major source of memory use.  Is there any way to publish data
into a table without loading the whole thing into memory, twice?

No, I did not design the database...