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插入数据库时如何从数据库获取最后结果
原标题:how to retrieve last result from database when it is inserted

我想知道在插入新数据时, 如何在标本上做某种事件?

我需要这个 这样我就能用谷歌地图 实时追踪

例如,这是我在地理定位页面上找到的代码:

function scrollMap(position) 
{
// Scrolls the map so that it is centered at (position.coords.latitude,position.coords.longitude).
}
// Request repeated updates.
var watchId = navigator.geolocation.watchPosition(scrollMap);

 function buttonClickHandler() 
 {
 // Cancel the updates when the user clicks a button. 
 //I want to put my code in here so for example when I click button live tracking starts.

   navigator.geolocation.clearWatch(watchId);
 }

这是我用来检索数据阵列的代码:

function initialize() {
  var myLatLng = new google.maps.LatLng(0, 180);
  var myOptions = {
    zoom: 3,
    center: myLatLng,
    mapTypeId: google.maps.MapTypeId.TERRAIN
  };

  var map = new google.maps.Map(document.getElementById("map_canvas"),
      myOptions);
  var flightPlanCoordinates = [<?php echo implode( , , $coordinates) ?>];
  var flightPath = new google.maps.Polyline({
    path: flightPlanCoordinates,
    strokeColor: "#FF0000",
    strokeOpacity: 1.0,
    strokeWeight: 2
  });

  flightPath.setMap(map);
}

每次插入到数据库中时,我如何使我的代码工作并获得最后一个结果?然后用我开始提问时提供的谷歌代码在地图上显示它。

数据库是 Mysql, 它有 ID, 纬度和经度 。

编辑:

这是我的PHP代码,从数据库中获取所有数据,并将其放入谷歌地图阵列:

$coordinates  = array();
$result = dbMySql::Exec( SELECT Latitude,Longitude FROM data );
while ($row = mysqli_fetch_assoc($result))
   $coordinates[] =  new google.maps.LatLng(  . $row[ Latitude ] .  ,   . $row[ Longitude ] .  ) ;
问题回答

最简单的解决方案是查看您的服务器。 询问在最后 X 分钟内创建的条目, 并添加新的条目 。





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