如何将此mySql查询转换为PDO格式...？

Question

How should i write my PDO Prepare and bindValue/param statement for this type of query where i check whether the value is not null then only add it to the query string .....

$query = "SELECT * FROM cabs WHERE DATE='$date' ";
if ($mode!=='' || $mode!=="")
  $query .="AND MODE='$mode' ";

if ($tfno!=='')
  $query .="AND TFNO='$tfno' ";
  $query .="ORDER BY TIME";

Answer 1

Quick answer, without testing:

<?php
$params = array(':date' => $date);
$query = "SELECT * FROM cabs WHERE DATE=':date' ";
if ($mode!=='' || $mode!=="") {
  $query .="AND MODE=':mode' ";
  $params[':mode'] = $mode;
}

if ($tfno!=='') {
  $query .="AND TFNO=':tfno' ";
  $params[':tfno'] = $tfno;
}
$query .="ORDER BY TIME";

$req = $dbh->prepare($query);
$req->execute($params);

Just push in the param array each time your query gets more filters, and using a name should be easier, I'm not sure that array_push would preserve the order, so ..