prepare($sql);    /*    //给SQL语句分配变量    $st->bindParam(1,$code);    $st->bindParam(2,$name);    $st->bindParam(3,$sex);    $st->bindParam(4,$nation);    $st->bindParam(5,$birthday);        //给变量赋值    $code = "p120";    $name = "接口";    $sex = true;    $nation = "n002";    $birthday = "1988-2-3";        //执行SQL语句    $st->execute();        */        //执行SQL语句，简便方法    $st->execute(array('p030','克隆',true,'n001','1989-2-3'));                    ?>