code: public Blob open_blob( String db, String table, String column, long row, boolean rw ) throws jsqlite.Exception {
          synchronized (this) {
              Blob blob = new Blob();
              _open_blob(db, table, column, row, rw, blob);
              return blob;
          }
      }
docs: Open an SQLite3 blob. Only available in SQLite 3.4.0 and above.
  @param db database name
  @param table table name
  @param column column name
  @param row row identifier
  @param rw if true, open for read-write, else read-only
  @return a Blob object