如何从外部php文件连接joomla3 DB？

Question

I have created external php file inside my module and there i have use some sql queries , first i have tried using php/mysql and it works , then i tried to make it convert to joomla style . but when i use joomla framework to db connection gives errors

Old code: FROM PHP

mysql_connect("localhost","root","");
mysql_select_db("1234");

 $searchp=$_GET["term"];
 $query=mysql_query("SELECT * FROM sltdb_cddir_content where title like '%".$searchp."%'AND categories_id=82 order by title ASC ");
 $json=array();
    while($display=mysql_fetch_array($query)){
         $json[]=array(
                    'value'=> $display["title"],
                    'label'=>$display["title"]
                        );
    }

 echo json_encode($json);

New Code : JOOMLA3

    define('_JEXEC', 1);
define('DS', DIRECTORY_SEPARATOR);

define('JPATH_BASE', $_SERVER['DOCUMENT_ROOT'] . DS . '');

require_once (JPATH_BASE . DS . 'includes' . DS . 'defines.php');
require_once (JPATH_BASE . DS . 'includes' . DS . 'framework.php');
require_once (JPATH_BASE . DS . 'libraries' . DS . 'joomla' . DS . 'factory.php');

//create application
$mainframe = &JFactory::getApplication('site');
$db = JFactory::getDBO();

// Create a new query object.
$query = $db -> getQuery(true);
$searchp = $_GET["term"];
$query -> select($db -> quoteName(array('title')));
$query -> from($db -> quoteName('sltdb_cddir_content'));
$query -> where($db -> quoteName('title') . ' LIKE ' . $db -> quote('\'$searchp.%\''));
$query -> order('ordering ASC');

$db -> setQuery($query);
$json = array();
while ($display = mysql_fetch_array($query)) {
    $json[] = array('value' => $display["title"], 'label' => $display["title"]);
}

echo json_encode($json);

once after converting to the code in joomla its given a error

*"mysql_fetch_array() expects parameter 1 to be resource, object given in "*

Please advice me where i have done incorrect .

EDIT 01

    define('_JEXEC', 1);
define('DS', DIRECTORY_SEPARATOR);

define('JPATH_BASE', $_SERVER['DOCUMENT_ROOT'] . DS . '');

require_once (JPATH_BASE . DS . 'includes' . DS . 'defines.php');
require_once (JPATH_BASE . DS . 'includes' . DS . 'framework.php');
require_once (JPATH_BASE . DS . 'libraries' . DS . 'joomla' . DS . 'factory.php');

//create application
$mainframe = &JFactory::getApplication('site');
$searchp = $_GET["term"];
$db = JFactory::getDBO();

// Create a new query object.
$query = $db -> getQuery(true);

$query -> select($db -> quoteName(array('title')));
$query -> from($db -> quoteName('sltdb_cddir_content'));
$query -> where($db -> quoteName('title') . ' LIKE ' . $db -> quote('\'$searchp.%\''));
$query->where($db->quoteName('categories_id')." = ".$db->quote(82));
$query -> order('ordering ASC');

$db->setQuery($query);

$results = $db-> loadAssocList();
$json = array();
foreach($results as $json_result) {
  $json[] = array('value' => $json_result["title"], 'label' => $json_result["title"]) ;
}

echo json_encode($json);

Answer 1

You are mixing using Joomla's "SDK" with pure PHP methods for data access, so I would recommend stay away from that mix:

1) mysql_fetch_array its going to be depreacated, and indeed it expects the 1st parameter to be a mysql connection created with a mysql_connect call, that's why the error says that the 1st parameter expects to be a resource, you can check the documentation in here http://www.php.net/mysql_fetch_array.

2) Since you are using Data Access classes from joomla to obtain the connection and build the query, which is fine, I would recommend keep using it for obtaining the results and looping through them, like this.

// Reset the query using our newly populated query object.
$db->setQuery($query);

// Load the results as a list of associated arrays.
$results = $db-> loadAssocList();
$json = array();
foreach($results as $json_result) {
  $json[] = array('value' => $json_result["title"], 'label' => $json_result["title"]) 
}

More about Joomla's DB access here: http://docs.joomla.org/Selecting_data_using_JDatabase