更改DB连接以连接到Wordpress连接 - 应该很简单吗？

Question

我希望有人可以帮助我，我想写下面的PHP脚本来连接WordPress的数据库连接，而不是通过自定义连接进行连接。

这与自定义连接的原始脚本

<?php 
require("phpsqlsearch_dbinfo.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, $username, $password); 
if (!$connection) { 
    die("Not connected : " . mysql_error()); 
} 

// Set the active mySQL database 
$db_selected = mysql_select_db($database, $connection); 
if (!$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); 

$result = mysql_query($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(); 
?> 

这是我目前如何使用该脚本使用WordPress的连接

 <?php 
    /* I have added this require as suggested in the replies below and the page seem to 
be connecting correctly to the wp database*/ 
    require('../../../../wp-blog-header.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); 

     /* Search the rows in the markers table*/ 
     global $wpdb; 
     /*$query = $wpdb->get_results("SELECT * FROM customers;");*/ 
/*I have removed the $wpdb->sprint below and just used sprint as per comments below - it seems to work*/   
$query = sprintf("SELECT address, name, lat, lng, (3959 * acos(cos(radians('%s')) * cos(radians(lat)) * cos(radians(lng) - radians('%s')) + sin(radians('%s')) * sin(radians(lat)))) AS distance FROM wp_markers HAVING distance < '%s' ORDER BY distance LIMIT 0 , 20", 
      mysql_real_escape_string($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(); 
     ?> 

连接到数据库我已经基本解除这部分从第一个脚本

require("phpsqlsearch_dbinfo.php"); 

并且还删除了这部分

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

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

，并加入这部分，我相信在连接到WordPress的分贝

global $wpdb; 
$query = $wpdb->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 wp_markers HAVING distance < '%s' ORDER BY distance LIMIT 0 , 20", 

但是现在我得到以下错误，当我查询页面

Fatal error: Call to a member function sprintf() on a non-object in 

的错误是在此行

$query = $wpdb->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 wp_markers HAVING distance < '%s' ORDER BY distance LIMIT 0 , 20", 

我需要做什么才能正确地转换代码来连接到wordpress数据库 - 它似乎现在连接到数据库，但xml没有从查询创建...我相信仍然有一个错误在某处此代码

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']); 
} 

Answer 1

您必须首先加载Wordpress引导才能使用$wpdb。尝试添加代码：

include('wp-load.php'); 

前

global $wpdb;