postgis 2.11/pgrouting 2.0 中的 pgrouting 研讨会代码问题

Question

我在让 pgrouting 研讨会在 Postgresql 9.2/PostGIS 2.11 和 Windows 上 pgrouting 2.0 上工作时遇到问题。

如何重写以下 php/sql 代码并使其与我的版本兼容：

<?php

  // Database connection settings
  define("PG_DB"  , "routing");
  define("PG_HOST", "localhost"); 
  define("PG_USER", "postgres");
  define("PG_PORT", "5432"); 
   define("PG_PASSWD",   "*******"); 
  define("TABLE",   "eastlegon"); 

  $counter = $pathlength = 0;

  // Retrieve start point
  $start = split(' ',$_REQUEST['startpoint']);
  $startPoint = array($start[0], $start[1]);

  // Retrieve end point
  $end = split(' ',$_REQUEST['finalpoint']);
  $endPoint = array($end[0], $end[1]);

  // Find the nearest edge
  $startEdge = findNearestEdge($startPoint);
  $endEdge   = findNearestEdge($endPoint);

  // FUNCTION findNearestEdge
  function findNearestEdge($lonlat) {

    // Connect to database
    $con = pg_connect("dbname=".PG_DB." host=".PG_HOST." user=".PG_USER." password=".PG_PASSWD);

    $sql = "SELECT gid, source, target, the_geom, 
             distance(the_geom, GeometryFromText(
                  'POINT(".$lonlat[0]." ".$lonlat[1].")', 4326)) AS dist 
            FROM ".TABLE."  
            WHERE the_geom && setsrid(
                  'BOX3D(".($lonlat[0]-200)." 
                         ".($lonlat[1]-200).", 
                         ".($lonlat[0]+200)." 
                         ".($lonlat[1]+200).")'::box3d, 4326) 
            ORDER BY dist LIMIT 1";

    $query = pg_query($con,$sql);  

    $edge['gid']      = pg_fetch_result($query, 0, 0);  
    $edge['source']   = pg_fetch_result($query, 0, 1);  
    $edge['target']   = pg_fetch_result($query, 0, 2);  
    $edge['the_geom'] = pg_fetch_result($query, 0, 3);  

    // Close database connection
    pg_close($con);

    return $edge;
  }

  // Select the routing algorithm
  switch($_REQUEST['method']) {

    case 'SPD' : // Shortest Path Dijkstra 

      $sql = "SELECT rt.gid, AsText(rt.the_geom) AS wkt, 
                   length(rt.the_geom) AS length, ".TABLE.".id 
                FROM ".TABLE.", 
                    (SELECT gid, the_geom 
                        FROM dijkstra_sp_delta(
                            '".TABLE."',
                            ".$startEdge['source'].",
                            ".$endEdge['target'].",
                            3000)
                     ) as rt 
                WHERE ".TABLE.".gid=rt.gid;";
      break;

    case 'SPA' : // Shortest Path A* 

      $sql = "SELECT rt.gid, AsText(rt.the_geom) AS wkt, 
                     length(rt.the_geom) AS length, ".TABLE.".id 
                  FROM ".TABLE.", 
                      (SELECT gid, the_geom 
                          FROM astar_sp_delta(
                              '".TABLE."',
                              ".$startEdge['source'].",
                              ".$endEdge['target'].",
                              3000)
                       ) as rt 
                  WHERE ".TABLE.".gid=rt.gid;";  
      break;

    case 'SPS' : // Shortest Path Shooting*

      $sql = "SELECT rt.gid, AsText(rt.the_geom) AS wkt, 
                     length(rt.the_geom) AS length, ".TABLE.".id 
                  FROM ".TABLE.", 
                      (SELECT gid, the_geom 
                          FROM shootingstar_sp(
                              '".TABLE."',
                              ".$startEdge['gid'].",
                              ".$endEdge['gid'].",
                              3000, 'length', false, false)
                       ) as rt 
                  WHERE ".TABLE.".gid=rt.gid;";
      break;  

  } // close switch

  // Database connection and query
  $dbcon = pg_connect("dbname=".PG_DB." host=".PG_HOST." user=".PG_USER." password=".PG_PASSWD);

  $query = pg_query($dbcon,$sql); 

  // Return route as XML
  $xml  = '<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>'."\n";
  $xml .= "<route>\n";

  // Add edges to XML file
  while($edge=pg_fetch_assoc($query)) {  

    $pathlength += $edge['length'];

    $xml .= "\t<edge id='".++$counter."'>\n";
    $xml .= "\t\t<id>".$edge['id']."</id>\n";
    $xml .= "\t\t<wkt>".$edge['wkt']."</wkt>\n";
    $xml .= "\t\t<length>".round(($pathlength/1000),3)."</length>\n";
    $xml .= "\t</edge>\n";
  }

  $xml .= "</route>\n";

  // Close database connection
  pg_close($dbcon);

  // Return routing result
  header('Content-type: text/xml',true);
  echo $xml;

?>

谢谢，

Answer 1

您发布的代码来自 pgRouting 1.0 研讨会，不适用于 pgRouting 2.0 有一个 pgRouting 2.0 研讨会，您应该看看。 pgRouting 2.0 是对整个 pgRouting API 的一次重大改写，它们之间没有兼容性。

Answer 2

我在这里遇到了一些问题，我查看了 postgis 2.1.1 文档常见问题解答，他们说所有旧函数都包含在 legacy.sql 中。这是否意味着上面的php代码可以工作？