public void userAdd(UserDTO user) { try (Connection conn = Conn.getConnection(); PreparedStatement pstmt = conn.prepareStatement("insert into user values(?,?,?,?)"); ) { pstmt.setInt(1, user.getUid()); pstmt.setString(2, Sha256.encrypt(user.getPassword())); pstmt.setString(3, user.getName()); pstmt.setString(4, user.getAuth()); pstmt.executeUpdate(); } catch (Exception e) { e.printStackTrace(); } }