/usr/share/php/arc/store/ARC2_StoreDeleteQueryHandler.php is in libarc-php 2.2.4-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/**
* ARC2 RDF Store DELETE Query Handler
*
* @author Benjamin Nowack <bnowack@semsol.com>
* @license http://arc.semsol.org/license
* @homepage <http://arc.semsol.org/>
* @package ARC2
*/
ARC2::inc('StoreQueryHandler');
class ARC2_StoreDeleteQueryHandler extends ARC2_StoreQueryHandler {
function __construct($a, &$caller) {/* caller has to be a store */
parent::__construct($a, $caller);
}
function __init() {/* db_con */
parent::__init();
$this->store = $this->caller;
$this->handler_type = 'delete';
}
/* */
function runQuery($infos) {
$this->infos = $infos;
$con = $this->store->getDBCon();
$t1 = ARC2::mtime();
/* delete */
$this->refs_deleted = false;
/* graph(s) only */
if (!$this->v('construct_triples', array(), $this->infos['query'])) {
$tc = $this->deleteTargetGraphs();
}
/* graph(s) + explicit triples */
elseif (!$this->v('pattern', array(), $this->infos['query'])) {
$tc = $this->deleteTriples();
}
/* graph(s) + constructed triples */
else {
$tc = $this->deleteConstructedGraph();
}
$t2 = ARC2::mtime();
/* clean up */
if ($tc && ($this->refs_deleted || (rand(1, 100) == 1))) $this->cleanTableReferences();
if ($tc && (rand(1, 100) == 1)) $this->store->optimizeTables();
if ($tc && (rand(1, 500) == 1)) $this->cleanValueTables();
$t3 = ARC2::mtime();
$index_dur = round($t3 - $t2, 4);
$dur = round($t3 - $t1, 4);
return array(
't_count' => $tc,
'delete_time' => $dur,
'index_update_time' => $index_dur,
);
}
/* */
function deleteTargetGraphs() {
$tbl_prefix = $this->store->getTablePrefix();
$r = 0;
$con = $this->store->getDBCon();
foreach ($this->infos['query']['target_graphs'] as $g) {
if ($g_id = $this->getTermID($g, 'g')) {
$rs = mysql_query('DELETE FROM ' . $tbl_prefix . 'g2t WHERE g = ' .$g_id, $con);
$r += mysql_affected_rows($con);
}
}
$this->refs_deleted = $r ? 1 : 0;
return $r;
}
/* */
function deleteTriples() {
$r = 0;
$dbv = $this->store->getDBVersion();
$tbl_prefix = $this->store->getTablePrefix();
$con = $this->store->getDBCon();
/* graph restriction */
$tgs = $this->infos['query']['target_graphs'];
$gq = '';
foreach ($tgs as $g) {
if ($g_id = $this->getTermID($g, 'g')) {
$gq .= $gq ? ', ' . $g_id : $g_id;
}
}
$gq = $gq ? ' AND G.g IN (' . $gq . ')' : '';
/* triples */
foreach ($this->infos['query']['construct_triples'] as $t) {
$q = '';
$skip = 0;
foreach (array('s', 'p', 'o') as $term) {
if (isset($t[$term . '_type']) && preg_match('/(var)/', $t[$term . '_type'])) {
//$skip = 1;
}
else {
$term_id = $this->getTermID($t[$term], $term);
$q .= ($q ? ' AND ' : '') . 'T.' . $term . '=' . $term_id;
/* explicit lang/dt restricts the matching */
if ($term == 'o') {
$o_lang = $this->v1('o_lang', '', $t);
$o_lang_dt = $this->v1('o_datatype', $o_lang, $t);
if ($o_lang_dt) {
$q .= ($q ? ' AND ' : '') . 'T.o_lang_dt=' . $this->getTermID($o_lang_dt, 'lang_dt');
}
}
}
}
if ($skip) {
continue;
}
if ($gq) {
$sql = ($dbv < '04-01') ? 'DELETE ' . $tbl_prefix . 'g2t' : 'DELETE G';
$sql .= '
FROM ' . $tbl_prefix . 'g2t G
JOIN ' . $this->getTripleTable() . ' T ON (T.t = G.t' . $gq . ')
WHERE ' . $q . '
';
$this->refs_deleted = 1;
}
else {/* triples only */
$sql = ($dbv < '04-01') ? 'DELETE ' . $this->getTripleTable() : 'DELETE T';
$sql .= ' FROM ' . $this->getTripleTable() . ' T WHERE ' . $q;
}
//$rs = mysql_query($sql, $con);
$rs = $this->queryDB($sql, $con);
if ($er = mysql_error($con)) {
$this->addError($er .' in ' . $sql);
}
$r += mysql_affected_rows($con);
}
return $r;
}
/* */
function deleteConstructedGraph() {
ARC2::inc('StoreConstructQueryHandler');
$h = new ARC2_StoreConstructQueryHandler($this->a, $this->store);
$sub_r = $h->runQuery($this->infos);
$triples = ARC2::getTriplesFromIndex($sub_r);
$tgs = $this->infos['query']['target_graphs'];
$this->infos = array('query' => array('construct_triples' => $triples, 'target_graphs' => $tgs));
return $this->deleteTriples();
}
/* */
function cleanTableReferences() {
/* lock */
if (!$this->store->getLock()) return $this->addError('Could not get lock in "cleanTableReferences"');
$con = $this->store->getDBCon();
$tbl_prefix = $this->store->getTablePrefix();
$dbv = $this->store->getDBVersion();
/* check for unconnected triples */
$sql = '
SELECT T.t FROM '. $tbl_prefix . 'triple T LEFT JOIN '. $tbl_prefix . 'g2t G ON ( G.t = T.t )
WHERE G.t IS NULL LIMIT 1
';
if (($rs = mysql_query($sql, $con)) && mysql_num_rows($rs)) {
/* delete unconnected triples */
$sql = ($dbv < '04-01') ? 'DELETE ' . $tbl_prefix . 'triple' : 'DELETE T';
$sql .= '
FROM ' . $tbl_prefix . 'triple T
LEFT JOIN ' . $tbl_prefix . 'g2t G ON (G.t = T.t)
WHERE G.t IS NULL
';
mysql_query($sql, $con);
}
/* check for unconnected graph refs */
if ((rand(1, 10) == 1)) {
$sql = '
SELECT G.g FROM '. $tbl_prefix . 'g2t G LEFT JOIN '. $tbl_prefix . 'triple T ON ( T.t = G.t )
WHERE T.t IS NULL LIMIT 1
';
if (($rs = mysql_query($sql, $con)) && mysql_num_rows($rs)) {
/* delete unconnected graph refs */
$sql = ($dbv < '04-01') ? 'DELETE ' . $tbl_prefix . 'g2t' : 'DELETE G';
$sql .= '
FROM ' . $tbl_prefix . 'g2t G
LEFT JOIN ' . $tbl_prefix . 'triple T ON (T.t = G.t)
WHERE T.t IS NULL
';
mysql_query($sql, $con);
}
}
/* release lock */
$this->store->releaseLock();
}
/* */
function cleanValueTables() {
/* lock */
if (!$this->store->getLock()) return $this->addError('Could not get lock in "cleanValueTables"');
$con = $this->store->getDBCon();
$tbl_prefix = $this->store->getTablePrefix();
$dbv = $this->store->getDBVersion();
/* o2val */
$sql = ($dbv < '04-01') ? 'DELETE ' . $tbl_prefix . 'o2val' : 'DELETE V';
$sql .= '
FROM ' . $tbl_prefix . 'o2val V
LEFT JOIN ' . $tbl_prefix . 'triple T ON (T.o = V.id)
WHERE T.t IS NULL
';
mysql_query($sql, $con);
/* s2val */
$sql = ($dbv < '04-01') ? 'DELETE ' . $tbl_prefix . 's2val' : 'DELETE V';
$sql .= '
FROM ' . $tbl_prefix . 's2val V
LEFT JOIN ' . $tbl_prefix . 'triple T ON (T.s = V.id)
WHERE T.t IS NULL
';
mysql_query($sql, $con);
/* id2val */
$sql = ($dbv < '04-01') ? 'DELETE ' . $tbl_prefix . 'id2val' : 'DELETE V';
$sql .= '
FROM ' . $tbl_prefix . 'id2val V
LEFT JOIN ' . $tbl_prefix . 'g2t G ON (G.g = V.id)
LEFT JOIN ' . $tbl_prefix . 'triple T1 ON (T1.p = V.id)
LEFT JOIN ' . $tbl_prefix . 'triple T2 ON (T2.o_lang_dt = V.id)
WHERE G.g IS NULL AND T1.t IS NULL AND T2.t IS NULL
';
//mysql_query($sql, $con);
}
/* */
}
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