saveImage.java

    boolean saveImage(String fileName, String contentType, InputStream inputStream) {
        Connection connection = null;
        PreparedStatement statement = null;
        ResultSet keySet = null;

        try {
            connection = dataSource.getConnection();
            statement = connection.prepareStatement("INSERT INTO images (filename, content_type, content) values (?, ?, ?)", 
                    new String[]  {"id"});
            statement.setString(1, fileName);
            statement.setString(2, contentType);
            statement.setBinaryStream(3, inputStream);

            statement.execute();
            
            keySet = statement.getGeneratedKeys();
            if (keySet.next()) {
               System.out.println("The new image ID is " + keySet.getInt(1));
            }

            return true;
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            close(keySet);
            close(statement);
            close(connection);
        }

        return false;
    }
}