Returns: A string containing the BLOB specified by
blob_handle.
fbsql_read_blob() reads BLOB data
from the database. If a select statement contains BLOB and/or
BLOB columns FrontBase will return the data directly when
data is fetched. This default behavior can be changed with
fbsql_set_lob_mode() so the fetch functions will
return handles to BLOB and CLOB data. If a handle is fetched
a user must call fbsql_read_blob() to
get the actual BLOB data from the database.
See also: fbsql_create_blob(), fbsql_read_blob(),
fbsql_read_clob(), and
fbsql_set_lob_mode().