Datatable实时只能工作几次，有时不工作，以前工作，但已经工作了

Question

我想要最后五个实时数据，它工作正常但突然停止，无法弄清楚问题，让我告诉你我在cron中运行3个脚本来更新服务器（LAN）中的数据，Datatable版本 - 1.10.13，有数百万的数据，但只使用最后五个。

表字段包括created_at的索引。

问题在于，数据表中的数据几乎没有变化，然后没有任何反应。

<table id="dataTables-example" class="table table-striped example">
          <thead>
              <tr>
                <th>Number</th>
                  <th>TVC Name</th>
                  <th>License Plate</th> 
                  <th>Date</th>
                  <th>Time</th>
                  <th>Action</th> 
              </tr>
          </thead>

      </table> 

上面的Html，遵循jQuery：

var table = $('#dataTables-example').DataTable({
            "aaSorting": [],
            ajax: "./licenseData.php",
           "bLengthChange": false,
            "bFilter": false,
            "bPaginate": false,
            "columns": [
                    { mData: 'slno' } ,
                    { mData: 'camera' } ,
                    { mData: 'license' },
                    { mData: 'dateNewFormat' },
                    { mData: 'timeData' },
                    { mData: 'actions' }
            ]
          });

          setInterval( function () {
            table.ajax.reload();
          }, 1000 );

以下PHP代码：

public function realtimeLicenseDetails()
{

    $i=1;
    $r=array();
    $stmt=$this->_db->prepare('SELECT cameraName as camera,licensePlate as licensePlate,dateAdded as dateAddedOn,extra as extraData, fileName as fileName FROM license ORDER BY created_at DESC LIMIT 5');
    $stmt->execute();
    $stmt->setFetchMode(PDO::FETCH_ASSOC);
    while ($row = $stmt->fetch())
    {
        //set camera for json output
        $rData['slno']=$i++;
        $rData['camera']=$row['camera'];
        //set license for json output
        $rData['license']=$row['licensePlate'];
        //set date for json output
        $dateAdded = $row['dateAddedOn'];
        $dateArray = explode("-", $dateAdded);
        $dateNewFormat = $dateArray[2].'-'.$dateArray[1].'-'.$dateArray[0];
        $rData['dateNewFormat']=$dateNewFormat;
        //set time for json output
        $timeData = $row['extraData'];
        $hours = substr($timeData, 0,2);
        $mins = substr($timeData, 2,2);
        $secs = substr($timeData, 4,2);
        $extraDetails = substr($timeData, 6,3);
        $timeDetails = $hours.':'.$mins.':'.$secs.' '.$extraDetails;
        $rData['timeData']=$timeDetails;
        //set action html buttons for json output
        $rData['actions']= '<a class="btn btn-danger" href="/FTPSERVERDEV/images/processed/'.$row['fileName'].'" download="'.$row['fileName'].'"><i class="fa fa-download"></i></a><button type="button" class="show-picture btn btn-danger btn-circle pull-right" title="Show picture" onClick="showPicture(this)" data-img="'.$row['fileName'].'"><i class="fa fa-info"></i></button>';
        $r[]=$rData;
    }
    $results = array(
        "sEcho" => 1,
        "iTotalRecords" => count($r),
        "iTotalDisplayRecords" => count($r),
        "aaData" => $r
    );
    echo json_encode($results);
}

我在licenseData.php中调用它，如下所示：

require 'includes/config.php';
$fileManager->realtimeLicenseDetails();

config只包含对象创建代码和其他不必要的细节。