如何将SQL查询转换为XQuery？

Question

我有sql数据库。我也已经使用existed db创建了xml数据库。 此代码用于连接到sql数据库。所以我需要将其转换为存在数据库连接。任何建议都必须感谢。

public void SetDetails(String uname){

    DBConnection();
    PreparedStatement pst;

    try {
        pst = con.prepareStatement("SELECT * FROM userdetails WHERE user_name=?");
        pst.setString(1, uname);

        ResultSet rs = pst.executeQuery();

        if(rs.next()){
            FName = rs.getString(1);
            LName = rs.getString(2);
            rs.getString(3);
            Birthday = rs.getString(4);
            Address =rs.getString(5);
            City = rs.getString(6);
            Email = rs.getString(7);
            Mobile = rs.getString(8);
            Password = rs.getString(9);
            Type = rs.getString(10);
            Name = FName + " " + LName;
        }

    } catch (Exception ex) {
        //Logger.getLogger(Server.class.getName()).log(Level.SEVERE, null, ex);
    }
}