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<?php
/**
* SemanticScuttle - your social bookmark manager.
*
* PHP version 5.
*
* @category Bookmarking
* @package SemanticScuttle
* @author Benjamin Huynh-Kim-Bang <mensonge@users.sourceforge.net>
* @author Christian Weiske <cweiske@cweiske.de>
* @author Eric Dane <ericdane@users.sourceforge.net>
* @license GPL http://www.gnu.org/licenses/gpl.html
* @link http://sourceforge.net/projects/semanticscuttle
*/
/**
* SemanticScuttle search history service.
*
* @category Bookmarking
* @package SemanticScuttle
* @author Benjamin Huynh-Kim-Bang <mensonge@users.sourceforge.net>
* @author Christian Weiske <cweiske@cweiske.de>
* @author Eric Dane <ericdane@users.sourceforge.net>
* @license GPL http://www.gnu.org/licenses/gpl.html
* @link http://sourceforge.net/projects/semanticscuttle
*/
class SemanticScuttle_Service_SearchHistory extends SemanticScuttle_DbService
{
/**
* Size of the search history.
* If the number of logged searches is larger than this,
* adding a new search will delete the oldest one automatically.
*
* Use -1 to deactivate automatic deletion.
*
* @var integer
*/
public $sizeSearchHistory;
/**
* Returns the single service instance
*
* @param DB $db Database object
*
* @return SemanticScuttle_Service
*/
public static function getInstance($db)
{
static $instance;
if (!isset($instance)) {
$instance = new self($db);
}
return $instance;
}
/**
* Creates a new instance.
*
* Sets $this->sizeSearchHistory to $GLOBALS['sizeSearchHistory'] or 10
* if the global variable is not defined.
*
* @param DB $db Database object
*/
public function __construct($db)
{
$this->db = $db;
$this->tablename = $GLOBALS['tableprefix'] . 'searchhistory';
if (isset($GLOBALS['sizeSearchHistory'])) {
$this->sizeSearchHistory = $GLOBALS['sizeSearchHistory'];
} else {
$this->sizeSearchHistory = 10;
}
}
/**
* Adds a new search to the search history.
* Automatically deletes the oldest search when the number of
* searches is larger than $sizeSearchHistory.
*
* @param string $terms Search terms separated by spaces
* @param string $range - 'all' - search was in all bookmarks
* - 'watchlist' - searched in watchlist
* - any username to show that the search happened
* in his own bookmarks.
* @param integer $nbResults Number of search result rows
* @param integer $uId ID of user that searched
*
* @return boolean True if it has been added, false if not
*/
public function addSearch($terms, $range, $nbResults, $uId = 0)
{
if (strlen($terms) == 0) {
return false;
}
$datetime = gmdate('Y-m-d H:i:s', time());
//Insert values
$values = array(
'shTerms' => $terms,
'shRange' => $range,
'shDatetime' => $datetime,
'shNbResults' => $nbResults,
'uId' => $uId
);
$sql = 'INSERT INTO ' . $this->getTableName()
. ' ' . $this->db->sql_build_array('INSERT', $values);
$this->db->sql_transaction('begin');
if (!($dbresult = $this->db->sql_query($sql))) {
$this->db->sql_transaction('rollback');
message_die(
GENERAL_ERROR, 'Could not insert search history',
'', __LINE__, __FILE__, $sql, $this->db
);
return false;
}
if ($this->sizeSearchHistory != -1
&& $this->countSearches() > $this->sizeSearchHistory
) {
$this->deleteOldestSearch();
}
return true;
}
/**
* Returns searches with the given features.
*
* @param string $range - 'all' - search was in all bookmarks
* - 'watchlist' - searched in watchlist
* - any username to show that the search happened
* in his own bookmarks.
* @param integer $uId Id of the user who searched. null for any users
* @param integer $nb Number of bookmarks to retrieve (paging)
* @param integer $start Number of bookmark to begin with (paging)
* @param boolean $distinct If the search terms shall be distinct
* @param boolean $withResults Only return searches that had at least one result
*
* @return array Array of search history database rows
*/
public function getAllSearches(
$range = null, $uId = null, $nb = null,
$start = null, $distinct = false, $withResults = false
) {
$sql = 'SELECT DISTINCT(shTerms),'
. ' shId, shRange, shNbResults, shDatetime, uId';
$sql.= ' FROM '. $this->getTableName();
$sql.= ' WHERE 1=1';
if ($range != null) {
$sql.= ' AND shRange = "'.$range.'"';
} else {
$sql.= ' AND shRange = "all"';
}
if ($uId != null) {
$sql.= ' AND uId = '.$uId;
}
if ($withResults == true) {
$sql.= ' AND shNbResults > 0';
}
if ($distinct) {
$sql.= ' GROUP BY shTerms';
}
$sql.= ' ORDER BY shId DESC';
if (!($dbresult = $this->db->sql_query_limit($sql, $nb, $start))) {
message_die(
GENERAL_ERROR, 'Could not get searches',
'', __LINE__, __FILE__, $sql, $this->db
);
return false;
}
$searches = array();
while ($row = $this->db->sql_fetchrow($dbresult)) {
$searches[] = $row;
}
$this->db->sql_freeresult($dbresult);
return $searches;
}
/**
* Counts the number of searches that have been made in total.
*
* @return integer Number of searches
*/
public function countSearches()
{
$sql = 'SELECT COUNT(*) AS `total` FROM '. $this->getTableName();
if (!($dbresult = $this->db->sql_query($sql))
|| (!($row = & $this->db->sql_fetchrow($dbresult)))
) {
message_die(
GENERAL_ERROR, 'Could not get total searches',
'', __LINE__, __FILE__, $sql, $this->db
);
return false;
}
$this->db->sql_freeresult($dbresult);
return $row['total'];
}
/**
* This function allows to limit the number of saved searches
* by deleting the oldest one
*
* @return boolean True when all went well, false in case of an error
*/
public function deleteOldestSearch()
{
$sql = 'DELETE FROM '.$this->getTableName();
// warning: here the limit is important
$sql .= ' ORDER BY shId ASC LIMIT 1';
$this->db->sql_transaction('begin');
if (!($dbresult = $this->db->sql_query($sql))) {
$this->db->sql_transaction('rollback');
message_die(
GENERAL_ERROR, 'Could not delete bookmarks',
'', __LINE__, __FILE__, $query, $this->db
);
return false;
}
return true;
}
/**
* Deletes all search history entries that have been made by the user
* with the given ID.
*
* @param integer $uId ID of the user
*
* @return boolean True when all went well, false in case of an error
*/
public function deleteSearchHistoryForUser($uId)
{
$query = 'DELETE FROM '. $this->getTableName()
. ' WHERE uId = ' . intval($uId);
if (!($dbresult = $this->db->sql_query($query))) {
message_die(
GENERAL_ERROR, 'Could not delete search history', '',
__LINE__, __FILE__, $query, $this->db
);
return false;
}
return true;
}
/**
* Deletes all search history entries.
*
* @return void
*/
public function deleteAll()
{
$query = 'TRUNCATE TABLE `'. $this->getTableName() .'`';
$this->db->sql_query($query);
}
}
?>
|
