Permalink
Find file
Fetching contributors…
Cannot retrieve contributors at this time
724 lines (645 sloc) 23 KB
<?php
/**
* ARC2 RDF Store
*
* @author Benjamin Nowack <bnowack@semsol.com>
* @license W3C Software License and GPL
* @homepage <https://github.com/semsol/arc2>
* @package ARC2
*/
ARC2::inc('Class');
class ARC2_Store extends ARC2_Class {
function __construct($a, &$caller) {
parent::__construct($a, $caller);
}
function __init() {/* db_con */
parent::__init();
$this->table_lock = 0;
$this->triggers = $this->v('store_triggers', array(), $this->a);
$this->queue_queries = $this->v('store_queue_queries', 0, $this->a);
$this->is_win = (strtolower(substr(PHP_OS, 0, 3)) == 'win') ? true : false;
$this->max_split_tables = $this->v('store_max_split_tables', 10, $this->a);
$this->split_predicates = $this->v('store_split_predicates', array(), $this->a);
}
/* */
function getName() {
return $this->v('store_name', 'arc', $this->a);
}
function getTablePrefix() {
if (!isset($this->tbl_prefix)) {
$r = $this->v('db_table_prefix', '', $this->a);
$r .= $r ? '_' : '';
$r .= $this->getName() . '_';
$this->tbl_prefix = $r;
}
return $this->tbl_prefix;;
}
/* */
function createDBCon() {
foreach (array('db_host' => 'localhost', 'db_user' => '', 'db_pwd' => '', 'db_name' => '') as $k => $v) {
$this->a[$k] = $this->v($k, $v, $this->a);
}
if (!$db_con = mysqli_connect($this->a['db_host'], $this->a['db_user'], $this->a['db_pwd'])) {
return $this->addError(mysqli_error($db_con));
}
$this->a['db_con'] = $db_con;
if (!mysqli_query( $db_con, "USE " . $this->a['db_name'])) {
$fixed = 0;
/* try to create it */
if ($this->a['db_name']) {
$this->queryDB("
CREATE DATABASE IF NOT EXISTS " . $this->a['db_name'] . "
DEFAULT CHARACTER SET utf8
DEFAULT COLLATE utf8_general_ci
", $db_con, 1
);
if (mysqli_query( $db_con, "USE " . $this->a['db_name'])) {
$this->queryDB("SET NAMES 'utf8'", $db_con);
$fixed = 1;
}
}
if (!$fixed) {
return $this->addError(mysqli_error($db_con));
}
}
if (preg_match('/^utf8/', $this->getCollation())) {
$this->queryDB("SET NAMES 'utf8'", $db_con);
}
// This is RDF, we may need many JOINs...
$this->queryDB("SET SESSION SQL_BIG_SELECTS=1", $db_con);
return true;
}
function getDBCon($force = 0) {
if ($force || !isset($this->a['db_con'])) {
if (!$this->createDBCon()) {
return false;
}
}
if (!$force && !@mysqli_thread_id($this->a['db_con'])) return $this->getDBCon(1);
return $this->a['db_con'];
}
function closeDBCon() {
if ($this->v('db_con', false, $this->a)) {
@mysqli_close($this->a['db_con']);
}
unset($this->a['db_con']);
}
function getDBVersion() {
if (!$this->v('db_version')) {
$this->db_version = preg_match("/^([0-9]+)\.([0-9]+)\.([0-9]+)/", mysqli_get_server_info($this->getDBCon()), $m) ? sprintf("%02d-%02d-%02d", $m[1], $m[2], $m[3]) : '00-00-00';
}
return $this->db_version;
}
/* */
function getCollation() {
$rs = $this->queryDB('SHOW TABLE STATUS LIKE "' . $this->getTablePrefix(). 'setting"', $this->getDBCon());
return ($rs && ($row = mysqli_fetch_array($rs)) && isset($row['Collation'])) ? $row['Collation'] : '';
}
function getColumnType() {
if (!$this->v('column_type')) {
$tbl = $this->getTablePrefix() . 'g2t';
$rs = $this->queryDB('SHOW COLUMNS FROM ' . $tbl . ' LIKE "t"', $this->getDBCon());
$row = $rs ? mysqli_fetch_array($rs) : array('Type' => 'mediumint');
$this->column_type = preg_match('/mediumint/', $row['Type']) ? 'mediumint' : 'int';
}
return $this->column_type;
}
/* */
function hasHashColumn($tbl) {
$var_name = 'has_hash_column_' . $tbl;
if (!isset($this->$var_name)) {
$tbl = $this->getTablePrefix() . $tbl;
$rs = $this->queryDB('SHOW COLUMNS FROM ' . $tbl . ' LIKE "val_hash"', $this->getDBCon());
$this->$var_name = ($rs && mysqli_fetch_array($rs));
}
return $this->$var_name;
}
/* */
function hasFulltextIndex() {
if (!isset($this->has_fulltext_index)) {
$this->has_fulltext_index = 0;
$tbl = $this->getTablePrefix() . 'o2val';
$rs = $this->queryDB('SHOW INDEX FROM ' . $tbl, $this->getDBCon());
while ($row = mysqli_fetch_array($rs)) {
if ($row['Column_name'] != 'val') continue;
if ($row['Index_type'] != 'FULLTEXT') continue;
$this->has_fulltext_index = 1;
break;
}
}
return $this->has_fulltext_index;
}
function enableFulltextSearch() {
if ($this->hasFulltextIndex()) return 1;
$tbl = $this->getTablePrefix() . 'o2val';
$this->queryDB('CREATE FULLTEXT INDEX vft ON ' . $tbl . '(val(128))', $this->getDBCon(), 1);
}
function disableFulltextSearch() {
if (!$this->hasFulltextIndex()) return 1;
$tbl = $this->getTablePrefix() . 'o2val';
$this->queryDB('DROP INDEX vft ON ' . $tbl, $this->getDBCon());
}
/* */
function countDBProcesses() {
return ($rs = $this->queryDB('SHOW PROCESSLIST', $this->getDBCon())) ? mysqli_num_rows($rs) : 0;
}
function killDBProcesses($needle = '', $runtime = 30) {
$dbcon = $this->getDBCon();
/* make sure needle is sql */
if (preg_match('/\?.+ WHERE/i', $needle, $m)) {
$needle = $this->query($needle, 'sql');
}
$rs = $this->queryDB('SHOW FULL PROCESSLIST', $dbcon);
$ref_tbl = $this->getTablePrefix() . 'triple';
while ($row = mysqli_fetch_array($rs)) {
if ($row['Time'] < $runtime) continue;
if (!preg_match('/^\s*(INSERT|SELECT) /s', $row['Info'])) continue; /* only basic queries */
if (!strpos($row['Info'], $ref_tbl . ' ')) continue; /* only from this store */
$kill = 0;
if ($needle && (strpos($row['Info'], $needle) !== false)) $kill = 1;
if (!$needle) $kill = 1;
if (!$kill) continue;
$this->queryDB('KILL ' . $row['Id'], $dbcon);
}
}
/* */
function getTables() {
return array('triple', 'g2t', 'id2val', 's2val', 'o2val', 'setting');
}
/* */
function isSetUp() {
if (($con = $this->getDBCon())) {
$tbl = $this->getTablePrefix() . 'setting';
return $this->queryDB("SELECT 1 FROM " . $tbl . " LIMIT 0", $con) ? 1 : 0;
}
}
function setUp($force = 0) {
if (($force || !$this->isSetUp()) && ($con = $this->getDBCon())) {
if ($this->getDBVersion() < '04-00-04') {
/* UPDATE + JOINs */
return $this->addError('MySQL version not supported. ARC requires version 4.0.4 or higher.');
}
ARC2::inc('StoreTableManager');
$mgr = new ARC2_StoreTableManager($this->a, $this);
$mgr->createTables();
}
}
function extendColumns() {
ARC2::inc('StoreTableManager');
$mgr = new ARC2_StoreTableManager($this->a, $this);
$mgr->extendColumns();
$this->column_type = 'int';
}
function splitTables() {
ARC2::inc('StoreTableManager');
$mgr = new ARC2_StoreTableManager($this->a, $this);
$mgr->splitTables();
}
/* */
function hasSetting($k) {
$tbl = $this->getTablePrefix() . 'setting';
$sql = "SELECT val FROM " . $tbl . " WHERE k = '" .md5($k). "'";
$rs = $this->queryDB($sql, $this->getDBCon());
return ($rs && ($row = mysqli_fetch_array($rs))) ? 1 : 0;
}
function getSetting($k, $default = 0) {
$tbl = $this->getTablePrefix() . 'setting';
$sql = "SELECT val FROM " . $tbl . " WHERE k = '" .md5($k). "'";
$rs = $this->queryDB($sql, $this->getDBCon());
if ($rs && ($row = mysqli_fetch_array($rs))) {
return unserialize($row['val']);
}
return $default;
}
function setSetting($k, $v) {
$con = $this->getDBCon();
$tbl = $this->getTablePrefix() . 'setting';
if ($this->hasSetting($k)) {
$sql = "UPDATE " .$tbl . " SET val = '" . mysqli_real_escape_string( $con, serialize($v)) . "' WHERE k = '" . md5($k) . "'";
}
else {
$sql = "INSERT INTO " . $tbl . " (k, val) VALUES ('" . md5($k) . "', '" . mysqli_real_escape_string( $con, serialize($v)) . "')";
}
return $this->queryDB($sql, $con);
}
function removeSetting($k) {
$tbl = $this->getTablePrefix() . 'setting';
return $this->queryDB("DELETE FROM " . $tbl . " WHERE k = '" . md5($k) . "'", $this->getDBCon());
}
function getQueueTicket() {
if (!$this->queue_queries) return 1;
$t = 'ticket_' . substr(md5(uniqid(rand())), 0, 10);
$con = $this->getDBCon();
/* lock */
$rs = $this->queryDB('LOCK TABLES ' . $this->getTablePrefix() . 'setting WRITE', $con);
/* queue */
$queue = $this->getSetting('query_queue', array());
$queue[] = $t;
$this->setSetting('query_queue', $queue);
$this->queryDB('UNLOCK TABLES', $con);
/* loop */
$lc = 0;
$queue = $this->getSetting('query_queue', array());
while ($queue && ($queue[0] != $t) && ($lc < 30)) {
if ($this->is_win) {
sleep(1);
$lc++;
}
else {
usleep(100000);
$lc += 0.1;
}
$queue = $this->getSetting('query_queue', array());
}
return ($lc < 30) ? $t : 0;
}
function removeQueueTicket($t) {
if (!$this->queue_queries) return 1;
$con = $this->getDBCon();
/* lock */
$this->queryDB('LOCK TABLES ' . $this->getTablePrefix() . 'setting WRITE', $con);
/* queue */
$vals = $this->getSetting('query_queue', array());
$pos = array_search($t, $vals);
$queue = ($pos < (count($vals) - 1)) ? array_slice($vals, $pos + 1) : array();
$this->setSetting('query_queue', $queue);
$this->queryDB('UNLOCK TABLES', $con);
}
/* */
function reset($keep_settings = 0) {
$con = $this->getDBCon();
$tbls = $this->getTables();
$prefix = $this->getTablePrefix();
/* remove split tables */
$ps = $this->getSetting('split_predicates', array());
foreach ($ps as $p) {
$tbl = 'triple_' . abs(crc32($p));
$this->queryDB('DROP TABLE ' . $prefix . $tbl, $con);
}
$this->removeSetting('split_predicates');
/* truncate tables */
foreach ($tbls as $tbl) {
if ($keep_settings && ($tbl == 'setting')) {
continue;
}
$this->queryDB('TRUNCATE ' . $prefix . $tbl, $con);
}
}
function drop() {
$con = $this->getDBCon();
$tbls = $this->getTables();
$prefix = $this->getTablePrefix();
foreach ($tbls as $tbl) {
$this->queryDB('DROP TABLE ' . $prefix . $tbl, $con);
}
}
function insert($doc, $g, $keep_bnode_ids = 0) {
$doc = is_array($doc) ? $this->toTurtle($doc) : $doc;
$infos = array('query' => array('url' => $g, 'target_graph' => $g));
ARC2::inc('StoreLoadQueryHandler');
$h = new ARC2_StoreLoadQueryHandler($this->a, $this);
$r = $h->runQuery($infos, $doc, $keep_bnode_ids);
$this->processTriggers('insert', $infos);
return $r;
}
function delete($doc, $g) {
if (!$doc) {
$infos = array('query' => array('target_graphs' => array($g)));
ARC2::inc('StoreDeleteQueryHandler');
$h = new ARC2_StoreDeleteQueryHandler($this->a, $this);
$r = $h->runQuery($infos);
$this->processTriggers('delete', $infos);
return $r;
}
}
function replace($doc, $g, $doc_2) {
return array($this->delete($doc, $g), $this->insert($doc_2, $g));
}
function dump() {
ARC2::inc('StoreDumper');
$d = new ARC2_StoreDumper($this->a, $this);
$d->dumpSPOG();
}
function createBackup($path, $q = '') {
ARC2::inc('StoreDumper');
$d = new ARC2_StoreDumper($this->a, $this);
$d->saveSPOG($path, $q);
}
function renameTo($name) {
$con = $this->getDBCon();
$tbls = $this->getTables();
$old_prefix = $this->getTablePrefix();
$new_prefix = $this->v('db_table_prefix', '', $this->a);
$new_prefix .= $new_prefix ? '_' : '';
$new_prefix .= $name . '_';
foreach ($tbls as $tbl) {
$rs = $this->queryDB('RENAME TABLE ' . $old_prefix . $tbl .' TO ' . $new_prefix . $tbl, $con);
$err = mysqli_error($con);
if (!empty($err)) {
return $this->addError($err);
}
}
$this->a['store_name'] = $name;
unset($this->tbl_prefix);
}
function replicateTo($name) {
$conf = array_merge($this->a, array('store_name' => $name));
$new_store = ARC2::getStore($conf);
$new_store->setUp();
$new_store->reset();
$con = $this->getDBCon();
$tbls = $this->getTables();
$old_prefix = $this->getTablePrefix();
$new_prefix = $new_store->getTablePrefix();
foreach ($tbls as $tbl) {
$rs = $this->queryDB('INSERT IGNORE INTO ' . $new_prefix . $tbl .' SELECT * FROM ' . $old_prefix . $tbl, $con);
$err = mysqli_error($con);
if (!empty($err)) {
return $this->addError($err);
}
}
return $new_store->query('SELECT COUNT(*) AS t_count WHERE { ?s ?p ?o}', 'row');
}
/* */
function query($q, $result_format = '', $src = '', $keep_bnode_ids = 0, $log_query = 0) {
if ($log_query) $this->logQuery($q);
$con = $this->getDBCon();
if (preg_match('/^dump/i', $q)) {
$infos = array('query' => array('type' => 'dump'));
}
else {
ARC2::inc('SPARQLPlusParser');
$p = new ARC2_SPARQLPlusParser($this->a, $this);
$p->parse($q, $src);
$infos = $p->getQueryInfos();
}
if ($result_format == 'infos') return $infos;
$infos['result_format'] = $result_format;
if (!isset($p) || !$p->getErrors()) {
$qt = $infos['query']['type'];
if (!in_array($qt, array('select', 'ask', 'describe', 'construct', 'load', 'insert', 'delete', 'dump'))) {
return $this->addError('Unsupported query type "'.$qt.'"');
}
$t1 = ARC2::mtime();
$r = array('query_type' => $qt, 'result' => $this->runQuery($infos, $qt, $keep_bnode_ids, $q));
$t2 = ARC2::mtime();
$r['query_time'] = $t2 - $t1;
/* query result */
if ($result_format == 'raw') {
return $r['result'];
}
if ($result_format == 'rows') {
return $r['result']['rows'] ? $r['result']['rows'] : array();
}
if ($result_format == 'row') {
return $r['result']['rows'] ? $r['result']['rows'][0] : array();
}
return $r;
}
return 0;
}
function runQuery($infos, $type, $keep_bnode_ids = 0, $q = '') {
ARC2::inc('Store' . ucfirst($type) . 'QueryHandler');
$cls = 'ARC2_Store' . ucfirst($type) . 'QueryHandler';
$h = new $cls($this->a, $this);
$ticket = 1;
$r = array();
if ($q && ($type == 'select')) $ticket = $this->getQueueTicket($q);
if ($ticket) {
if ($type == 'load') {/* the LoadQH supports raw data as 2nd parameter */
$r = $h->runQuery($infos, '', $keep_bnode_ids);
}
else {
$r = $h->runQuery($infos, $keep_bnode_ids);
}
}
if ($q && ($type == 'select')) $this->removeQueueTicket($ticket);
$trigger_r = $this->processTriggers($type, $infos);
return $r;
}
function processTriggers($type, $infos) {
$r = array();
$trigger_defs = $this->triggers;
$this->triggers = array();
$triggers = $this->v($type, array(), $trigger_defs);
if ($triggers) {
$r['trigger_results'] = array();
$triggers = is_array($triggers) ? $triggers : array($triggers);
$trigger_inc_path = $this->v('store_triggers_path', '', $this->a);
foreach ($triggers as $trigger) {
$trigger .= !preg_match('/Trigger$/', $trigger) ? 'Trigger' : '';
if (ARC2::inc(ucfirst($trigger), $trigger_inc_path)) {
$cls = 'ARC2_' . ucfirst($trigger);
$config = array_merge($this->a, array('query_infos' => $infos));
$trigger_obj = new $cls($config, $this);
if (method_exists($trigger_obj, 'go')) {
$r['trigger_results'][] = $trigger_obj->go();
}
}
}
}
$this->triggers = $trigger_defs;
return $r;
}
/* */
function getValueHash($val, $_32bit = false) {
$hash = crc32($val);
if ($_32bit && ($hash & 0x80000000)) {
$hash = sprintf("%u", $hash);
}
$hash = abs($hash);
return $hash;
}
function getTermID($val, $term = '') {
/* mem cache */
if (!isset($this->term_id_cache) || (count(array_keys($this->term_id_cache)) > 100)) {
$this->term_id_cache = array();
}
if (!isset($this->term_id_cache[$term])) {
$this->term_id_cache[$term] = array();
}
$tbl = preg_match('/^(s|o)$/', $term) ? $term . '2val' : 'id2val';
/* cached? */
if ((strlen($val) < 100) && isset($this->term_id_cache[$term][$val])) {
return $this->term_id_cache[$term][$val];
}
$con = $this->getDBCon();
$r = 0;
/* via hash */
if (preg_match('/^(s2val|o2val)$/', $tbl) && $this->hasHashColumn($tbl)) {
$sql = "SELECT id, val FROM " . $this->getTablePrefix() . $tbl . " WHERE val_hash = '" . $this->getValueHash($val) . "' ORDER BY id";
$rs = $this->queryDB($sql, $con);
if (!$rs || !mysqli_num_rows($rs)) {// try 32 bit version
$sql = "SELECT id, val FROM " . $this->getTablePrefix() . $tbl . " WHERE val_hash = '" . $this->getValueHash($val, true) . "' ORDER BY id";
$rs = $this->queryDB($sql, $con);
}
if (($rs = $this->queryDB($sql, $con)) && mysqli_num_rows($rs)) {
while ($row = mysqli_fetch_array($rs)) {
if ($row['val'] == $val) {
$r = $row['id'];
break;
}
}
}
}
/* exact match */
else {
$sql = "SELECT id FROM " . $this->getTablePrefix() . $tbl . " WHERE val = BINARY '" . mysqli_real_escape_string( $con, $val) . "' LIMIT 1";
if (($rs = $this->queryDB($sql, $con)) && mysqli_num_rows($rs) && ($row = mysqli_fetch_array($rs))) {
$r = $row['id'];
}
}
if ($r && (strlen($val) < 100)) {
$this->term_id_cache[$term][$val] = $r;
}
return $r;
}
function getIDValue($id, $term = '') {
$tbl = preg_match('/^(s|o)$/', $term) ? $term . '2val' : 'id2val';
$con = $this->getDBCon();
$sql = "SELECT val FROM " . $this->getTablePrefix() . $tbl . " WHERE id = " . mysqli_real_escape_string( $con, $id) . " LIMIT 1";
if (($rs = $this->queryDB($sql, $con)) && mysqli_num_rows($rs) && ($row = mysqli_fetch_array($rs))) {
return $row['val'];
}
return 0;
}
/* */
function getLock($t_out = 10, $t_out_init = '') {
if (!$t_out_init) $t_out_init = $t_out;
$con = $this->getDBCon();
$l_name = $this->a['db_name'] . '.' . $this->getTablePrefix() . '.write_lock';
$rs = $this->queryDB('SELECT IS_FREE_LOCK("' . $l_name. '") AS success', $con);
if ($rs) {
$row = mysqli_fetch_array($rs);
if (!$row['success']) {
if ($t_out) {
sleep(1);
return $this->getLock($t_out - 1, $t_out_init);
}
}
else {
$rs = $this->queryDB('SELECT GET_LOCK("' . $l_name. '", ' . $t_out_init. ') AS success', $con);
if ($rs) {
$row = mysqli_fetch_array($rs);
return $row['success'];
}
}
}
return 0;
}
function releaseLock() {
$con = $this->getDBCon();
return $this->queryDB('DO RELEASE_LOCK("' . $this->a['db_name'] . '.' . $this->getTablePrefix() . '.write_lock")', $con);
}
/* */
function processTables($level = 2, $operation = 'optimize') {/* 1: triple + g2t, 2: triple + *2val, 3: all tables */
$con = $this->getDBCon();
$pre = $this->getTablePrefix();
$tbls = $this->getTables();
$sql = '';
foreach ($tbls as $tbl) {
if (($level < 3) && preg_match('/(backup|setting)$/', $tbl)) continue;
if (($level < 2) && preg_match('/(val)$/', $tbl)) continue;
$sql .= $sql ? ', ' : strtoupper($operation) . ' TABLE ';
$sql .= $pre . $tbl;
}
$this->queryDB($sql, $con);
$err = mysqli_error($con);
if (!empty($err)) {
$this->addError($err . ' in ' . $sql);
}
}
function optimizeTables($level = 2) {
if ($this->v('ignore_optimization')) return 1;
return $this->processTables($level, 'optimize');
}
function checkTables($level = 2) {
return $this->processTables($level, 'check');
}
function repairTables($level = 2) {
return $this->processTables($level, 'repair');
}
/* */
function changeNamespaceURI($old_uri, $new_uri) {
ARC2::inc('StoreHelper');
$c = new ARC2_StoreHelper($this->a, $this);
return $c->changeNamespaceURI($old_uri, $new_uri);
}
/* */
function getResourceLabel($res, $unnamed_label = 'An unnamed resource') {
if (!isset($this->resource_labels)) $this->resource_labels = array();
if (isset($this->resource_labels[$res])) return $this->resource_labels[$res];
if (!preg_match('/^[a-z0-9\_]+\:[^\s]+$/si', $res)) return $res;/* literal */
$ps = $this->getLabelProps();
if ($this->getSetting('store_label_properties', '-') != md5(serialize($ps))) {
$this->inferLabelProps($ps);
}
//$sub_q .= $sub_q ? ' || ' : '';
//$sub_q .= 'REGEX(str(?p), "(last_name|name|fn|title|label)$", "i")';
$q = 'SELECT ?label WHERE { <' . $res . '> ?p ?label . ?p a <http://semsol.org/ns/arc#LabelProperty> } LIMIT 3';
$r = '';
$rows = $this->query($q, 'rows');
foreach ($rows as $row) {
$r = strlen($row['label']) > strlen($r) ? $row['label'] : $r;
}
if (!$r && preg_match('/^\_\:/', $res)) {
return $unnamed_label;
}
$r = $r ? $r : preg_replace("/^(.*[\/\#])([^\/\#]+)$/", '\\2', str_replace('#self', '', $res));
$r = str_replace('_', ' ', $r);
$r = preg_replace_callback('/([a-z])([A-Z])/', function($matches) {
return $matches[1] . ' ' . strtolower($matches[2]);
}, $r);
$this->resource_labels[$res] = $r;
return $r;
}
function getLabelProps() {
return array_merge(
$this->v('rdf_label_properties' , array(), $this->a),
array(
'http://www.w3.org/2000/01/rdf-schema#label',
'http://xmlns.com/foaf/0.1/name',
'http://purl.org/dc/elements/1.1/title',
'http://purl.org/rss/1.0/title',
'http://www.w3.org/2004/02/skos/core#prefLabel',
'http://xmlns.com/foaf/0.1/nick',
)
);
}
function inferLabelProps($ps) {
$this->query('DELETE FROM <label-properties>');
$sub_q = '';
foreach ($ps as $p) {
$sub_q .= ' <' . $p . '> a <http://semsol.org/ns/arc#LabelProperty> . ';
}
$this->query('INSERT INTO <label-properties> { ' . $sub_q. ' }');
$this->setSetting('store_label_properties', md5(serialize($ps)));
}
/* */
function getResourcePredicates($res) {
$r = array();
$rows = $this->query('SELECT DISTINCT ?p WHERE { <' . $res . '> ?p ?o . }', 'rows');
foreach ($rows as $row) {
$r[$row['p']] = array();
}
return $r;
}
function getDomains($p) {
$r = array();
foreach($this->query('SELECT DISTINCT ?type WHERE {?s <' . $p . '> ?o ; a ?type . }', 'rows') as $row) {
$r[] = $row['type'];
}
return $r;
}
function getPredicateRange($p) {
$row = $this->query('SELECT ?val WHERE {<' . $p . '> rdfs:range ?val . } LIMIT 1', 'row');
return $row ? $row['val'] : '';
}
/* */
function logQuery($q) {
$fp = @fopen("arc_query_log.txt", "a");
@fwrite($fp, date('Y-m-d\TH:i:s\Z', time()) . ' : ' . $q . '' . "\n\n");
@fclose($fp);
}
/* */
}