无法分页：Php PDO 中的总值无效（必须是整数 > 0）

Question

我正在处理一个查询几天并坚持成功执行它。我正在使用位于此处的分页类 Pagination.class

到目前为止，这是我的代码。问题是它一直显示错误

if(isset($_REQUEST['maker'])){$makes = $_REQUEST['maker']; }
if(isset($_REQUEST['transmission'])){ $trans = $_REQUEST['transmission']; } 
if(isset($_REQUEST['year_from'])){ $yearf = $_REQUEST['year_from']; } 
if(isset($_REQUEST['year_to'])){ $yeart = $_REQUEST['year_to']; } 
if(isset($_REQUEST['fuel'])){ $fuels = $_REQUEST['fuel']; } 


if($makes == NULL || NULL == $makes)
{
$makes='%';
 }


 if($trans == NULL || NULL == $trans)
{
 $trans='%';
 }


if($fuels == NULL || NULL == $fuels)
{
$fuels='%';
 }




 try{

$conn = new PDO('mysql:host=localhost;dbname=vc', 'root', '');
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); 

 $result = $conn->prepare('SELECT COUNT(*) FROM vehicle WHERE 
(`Make` LIKE :maker) AND(`Transmission` LIKE :transmission)  AND 
(YEAR(STR_TO_DATE(`Year`,"%Y")) BETWEEN (:year_from) AND (:year_to)) AND
 (`Fuel` LIKE :fuel)'); 

$result->bindParam(':maker', $makes, PDO::PARAM_STR);
$result->bindParam(':transmission', $trans, PDO::PARAM_STR);
 $result->bindParam(':year_from', $yearf,PDO::PARAM_STR);
$result->bindParam(':year_to', $yeart, PDO::PARAM_STR);
$result->bindParam(':fuel', $fuels, PDO::PARAM_STR);

$result->execute(); 
  $num_rows=$result->fetchColumn();  

$pages = new Paginator($num_rows,5,array(15,3,6,9,12,25,50,100,250,'All'));
//echo $pages->display_pages();

//echo "<span class=\"\">".$pages->display_jump_menu().$pages->display_items_per_page()."</span>";



  $stmt = $conn->prepare('SELECT * FROM vehicle WHERE 
(`Make` LIKE :maker) AND (`Transmission` LIKE :transmission)  AND  
(YEAR(STR_TO_DATE(`Year`,"%Y")) BETWEEN (:year_from) AND (:year_to)) 
AND (`Fuel` LIKE :fuel) ORDER BY Year DESC LIMIT :start,:end');

$stmt->bindParam(':start', $pages->limit_start, PDO::PARAM_INT);
$stmt->bindParam(':end', $pages->limit_end, PDO::PARAM_INT);
$stmt->bindParam(':maker', $makes, PDO::PARAM_STR);
$stmt->bindParam(':transmission', $trans, PDO::PARAM_STR);
$stmt->bindParam(':year_from', $yearf, PDO::PARAM_STR);
$stmt->bindParam(':year_to', $yeart, PDO::PARAM_STR);
$stmt->bindParam(':fuel', $fuels, PDO::PARAM_STR);



$stmt->execute();
 $rs = $stmt->fetchAll();

无法分页：总值无效（必须是大于 0 的整数）

当将年份字段留空时，它会给出错误。当插入 year_from 和 year_to 字段时，它的工作正常。任何人都可以帮忙吗？卡了5天

年度数据库字段为日期

问题出在子句之间

Answer 1

如果您将year_from 和year_to 参数留空，则$yearf 和$yeart 保持未定义并且以下代码

$result->bindParam(':year_from', $yearf,PDO::PARAM_STR);
$result->bindParam(':year_to', $yeart, PDO::PARAM_STR);

将参数绑定到空字符串，从而产生这样的查询

BETWEEN ('') AND ('')

结果为空，$num_rows为0，Pagination构造函数中验证失败。

您应该在 php.ini 中使用 error_reporting=E_ALL 和 display_errors=On 进行开发，这会警告您未定义的变量。