public static Atributos sqlLeer(Atributos attr){
        String sql="select * from atributos where idatributos = '"+attr.getId()+"' ";        
        if(!BD.getInstance().sqlSelect(sql)){
            return null;
        }
        if(!BD.getInstance().sqlFetch()){
            return null;
        }
        
        attr.setId(BD.getInstance().getInt("idatributos"));
        attr.setAttr(BD.getInstance().getString("atributo"));
        attr.setTextarea(BD.getInstance().getInt("textarea"));
        return attr;
    }