Question

当我发现时，我正在关注this教程，我无法查看预期的输出，因为我无法以xml格式查看我的数据。我稍微更改了配置数据，不知道是不是故障原因？

<?php  

// Get parameters from URL
$center_lat = $_GET["lat"];
$center_lng = $_GET["lng"];
$radius = $_GET["radius"];

// Start XML file, create parent node
$dom = new DOMDocument("1.0");
$node = $dom->createElement("markers");
$parnode = $dom->appendChild($node);

// Opens a connection to a mySQL server
$connection=mysql_connect (localhost, 'root', '12345678');
if (!$connection) {
  die("Not connected : " . mysql_error());
}

// Set the active mySQL database
$db_selected = mysql_select_db('demo', $connection);
if (!$db_selected) {
  die ("Can\'t use db : " . mysql_error());
}

// Search the rows in the markers table
$query = sprintf("SELECT address, name, lat, lng, ( 3959 * acos( cos( radians('%s') ) * cos( radians( lat ) ) * cos( radians( lng ) - radians('%s') ) + sin( radians('%s') ) * sin( radians( lat ) ) ) ) AS distance FROM markers HAVING distance < '%s' ORDER BY distance LIMIT 0 , 20",
  mysql_real_escape_string($center_lat),
  mysql_real_escape_string($center_lng),
  mysql_real_escape_string($center_lat),
  mysql_real_escape_string($radius));
$result = mysql_query($query);

if (!$result) {
  die("Invalid query: " . mysql_error());
}

header("Content-type: text/xml");

// Iterate through the rows, adding XML nodes for each
while ($row = @mysql_fetch_assoc($result)){
  $node = $dom->createElement("marker");
  $newnode = $parnode->appendChild($node);
  $newnode->setAttribute("name", $row['name']);
  $newnode->setAttribute("address", $row['address']);
  $newnode->setAttribute("lat", $row['lat']);
  $newnode->setAttribute("lng", $row['lng']);
  $newnode->setAttribute("distance", $row['distance']);
}

echo $dom->saveXML();
?>

我希望得到类似的结果http://gmaps-samples.googlecode.com/svn/trunk/articles-phpsqlsearch/phpsqlsearch_expectedoutput.xml，但似乎没有任何结果。好像它没有任何数据，但我已经在我的mysql中导入了数据。

Answer 1

问题的第一步：

<?php  

// Get parameters from URL
$center_lat = ( isset( $_GET["lat"] ) ? $_GET["lat"] : 0 ); # You could replace these "0"s with the
$center_lng = ( isset( $_GET["lng"] ) ? $_GET["lng"] : 0 ); # Lat/Lng of a default location.
$radius     = ( isset( $_GET["radius"] ) ? $_GET["radius"] : 10 ); # Again, default radius.

// Start XML file, create parent node
$dom = new DOMDocument("1.0");
$node = $dom->createElement("markers");
$parnode = $dom->appendChild($node);

// Opens a connection to a mySQL server
if( !( $connection = mysql_connect( 'localhost' , 'root' , '12345678' ) ) ) # The SQL Server address must be a string or IP address
  die( "MySQL Error - Failed to connect to Server : " . mysql_error() );

// Set the active mySQL database
if( !mysql_select_db( 'demo' , $connection ) );
  die( "MySQL Error - Failed to connect to Database : " . mysql_error() );

// Search the rows in the markers table
$query = sprintf( "SELECT address, name, lat, lng, ( 3959 * acos( cos( radians('%s') ) * cos( radians( lat ) ) * cos( radians( lng ) - radians('%s') ) + sin( radians('%s') ) * sin( radians( lat ) ) ) ) AS distance FROM markers HAVING distance < '%s' ORDER BY distance LIMIT 0 , 20",
  mysql_real_escape_string( $center_lat ),
  mysql_real_escape_string( $center_lng ),
  mysql_real_escape_string( $center_lat ),
  mysql_real_escape_string( $radius ) );
$result = mysql_query( $query );

if( !$result )
  die( "MySQL Error - Invalid query: " . mysql_error() . ' "'.$query.'"' ); # During debugging, echo the SQL Statement on Error

if( !headers_sent() )
  header( "Content-type: text/xml" );

// Iterate through the rows, adding XML nodes for each
if( mysql_num_rows( $result ) ){
  while ($row = @mysql_fetch_assoc($result)){
    $node = $dom->createElement("marker");
    $newnode = $parnode->appendChild($node);
    $newnode->setAttribute("name", $row['name']);
    $newnode->setAttribute("address", $row['address']);
    $newnode->setAttribute("lat", $row['lat']);
    $newnode->setAttribute("lng", $row['lng']);
    $newnode->setAttribute("distance", $row['distance']);
  }
}else
  die( 'MySQL Error - No Records Returned "'.$query.'"' );

echo $dom->saveXML();
?>

给它一个去，让我们知道你看到的任何进一步的错误信息。

Answer 2

我有同样的问题，没有数据，这里是错误

MySQL错误 - 没有记录返回“SELECT地址，名称，lat，lng，（3959 * acos（cos（弧度（'37'））* cos（弧度（lat））* cos（弧度（lng） - 弧度（'-122'））+ sin（弧度（'37'））* sin（弧度（纬度））））AS距离距离标记距离＆lt; '25'ORDER BY距离LIMIT 0,20“

数据库已填充，我发送get vars，如下所示： http://localhost/superga/lib/phpsqlsearch_genxml.php?lat=37&lng=-122&radius=25

感谢

Answer 3

我正在遵循相同的教程，并在同一点上在道路上弯曲。我已经按照上面的所有建议，仍然没有决心。我的错误是;

此页面包含以下错误：第1行第1行的错误：文档为空下面是第一个错误的页面呈现。

任何人都可以上班吗？

保

使用php无法从mysql显示XML数据

3 个答案: