CREATE TABLE image(NAME VARCHAR2(100),DATA BLOB);
DECLARE
  LOB_LOC  BLOB;
  SRC_FILE BFILE;
  DST_FILE BLOB;
  LGH_FILE BINARY_INTEGER;
BEGIN
  INSERT INTO IMAGE
  VALUES
    ('my_1.png', EMPTY_BLOB())
  RETURNING DATA INTO LOB_LOC;
  SRC_FILE := BFILENAME('your_directory', 'my.png');
  SELECT DATA INTO DST_FILE FROM IMAGE WHERE NAME = 'my_1.png' FOR UPDATE;
  DBMS_LOB.FILEOPEN(SRC_FILE, DBMS_LOB.FILE_READONLY);
  LGH_FILE := DBMS_LOB.GETLENGTH(SRC_FILE);
  DBMS_LOB.LOADFROMFILE(DST_FILE, SRC_FILE, LGH_FILE);
  UPDATE IMAGE SET DATA = DST_FILE WHERE NAME = 'my_1.png';
  DBMS_LOB.FILECLOSE(SRC_FILE);
  COMMIT;
END;
/