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<?php
/**
* ARC2 RDF Store SELECT Query Handler
*
* @author Benjamin Nowack
* @license http://arc.semsol.org/license
* @homepage <http://arc.semsol.org/>
* @package ARC2
* @version 2010-11-16
*
*/
ARC2::inc('StoreQueryHandler');
class ARC2_StoreSelectQueryHandler 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;
$con = $this->store->getDBCon();
$this->handler_type = 'select';
$this->engine_type = $this->v('store_engine_type', 'MyISAM', $this->a);
$this->cache_results = $this->v('store_cache_results', 0, $this->a);
}
/* */
function runQuery($infos) {
$con = $this->store->getDBCon();
$rf = $this->v('result_format', '', $infos);
$this->infos = $infos;
$this->infos['null_vars'] = array();
$this->indexes = array();
$this->pattern_order_offset = 0;
$q_sql = $this->getSQL();
/* debug result formats */
if ($rf == 'sql') return $q_sql;
if ($rf == 'structure') return $this->infos;
if ($rf == 'index') return $this->indexes;
/* create intermediate results (ID-based) */
$tmp_tbl = $this->createTempTable($q_sql);
/* join values */
$r = $this->getFinalQueryResult($q_sql, $tmp_tbl);
/* remove intermediate results */
if (!$this->cache_results) {
$this->queryDB('DROP TABLE IF EXISTS ' . $tmp_tbl, $con);
}
return $r;
}
function getSQL() {
$r = '';
$nl = "\n";
$this->buildInitialIndexes();
foreach ($this->indexes as $i => $index) {
$this->index = array_merge($this->getEmptyIndex(), $index);
$this->analyzeIndex($this->getPattern('0'));
$sub_r = $this->getQuerySQL();
$r .= $r ? $nl . 'UNION' . $this->getDistinctSQL() . $nl : '';
$r .= $this->is_union_query ? '(' . $sub_r . ')' : $sub_r;
$this->indexes[$i] = $this->index;
}
$r .= $this->is_union_query ? $this->getLIMITSQL() : '';
if ($this->v('order_infos', 0, $this->infos['query'])) {
$r = preg_replace('/SELECT(\s+DISTINCT)?\s*/', 'SELECT\\1 NULL AS `_pos_`, ', $r);
}
$pd_count = $this->problematicDependencies();
if ($pd_count) {
/* re-arranging the patterns sometimes reduces the LEFT JOIN dependencies */
$set_sql = 0;
if (!$this->pattern_order_offset) $set_sql = 1;
if (!$set_sql && ($pd_count < $this->opt_sql_pd_count)) $set_sql = 1;
if (!$set_sql && ($pd_count == $this->opt_sql_pd_count) && (strlen($r) < strlen($this->opt_sql))) $set_sql = 1;
if ($set_sql) {
$this->opt_sql = $r;
$this->opt_sql_pd_count = $pd_count;
}
$this->pattern_order_offset++;
if ($this->pattern_order_offset > 5) {
return $this->opt_sql;
}
return $this->getSQL();
}
return $r;
}
function buildInitialIndexes() {
$this->dependency_log = array();
$this->index = $this->getEmptyIndex();
$this->buildIndex($this->infos['query']['pattern'], 0);
$tmp = $this->index;
$this->analyzeIndex($this->getPattern('0'));
$this->initial_index = $this->index;
$this->index = $tmp;
$this->is_union_query = $this->index['union_branches'] ? 1 : 0;
$this->indexes = $this->is_union_query ? $this->getUnionIndexes($this->index) : array($this->index);
}
function createTempTable($q_sql) {
$con = $this->store->getDBCon();
$v = $this->store->getDBVersion();
if ($this->cache_results) {
$tbl = $this->store->getTablePrefix() . 'Q' . md5($q_sql);
}
else {
$tbl = $this->store->getTablePrefix() . 'Q' . md5($q_sql . time() . uniqid(rand()));
}
if (strlen($tbl) > 64) $tbl = 'Q' . md5($tbl);
$tmp_sql = 'CREATE TEMPORARY TABLE ' . $tbl . ' ( ' . $this->getTempTableDef($tbl, $q_sql) . ') ';
$tmp_sql .= (($v < '04-01-00') && ($v >= '04-00-18')) ? 'ENGINE' : (($v >= '04-01-02') ? 'ENGINE' : 'TYPE');
$tmp_sql .= '=' . $this->engine_type;/* HEAP doesn't support AUTO_INCREMENT, and MySQL breaks on MEMORY sometimes */
if (!$this->queryDB($tmp_sql, $con) && !$this->queryDB(str_replace('CREATE TEMPORARY', 'CREATE', $tmp_sql), $con)) {
return $this->addError(mysql_error($con));
}
mysql_unbuffered_query('INSERT INTO ' . $tbl . ' ' . "\n" . $q_sql, $con);
if ($er = mysql_error($con)) $this->addError($er);
return $tbl;
}
function getEmptyIndex() {
return array(
'from' => array(),
'join' => array(),
'left_join' => array(),
'vars' => array(), 'graph_vars' => array(), 'graph_uris' => array(),
'bnodes' => array(),
'triple_patterns' => array(),
'sub_joins' => array(),
'constraints' => array(),
'union_branches'=> array(),
'patterns' => array(),
'havings' => array()
);
}
function getTempTableDef($tmp_tbl, $q_sql) {
$col_part = preg_replace('/^SELECT\s*(DISTINCT)?(.*)FROM.*$/s', '\\2', $q_sql);
$parts = explode(',', $col_part);
$has_order_infos = $this->v('order_infos', 0, $this->infos['query']);
$r = '';
$added = array();
foreach ($parts as $part) {
if (preg_match('/\.?(.+)\s+AS\s+`(.+)`/U', trim($part), $m) && !isset($added[$m[2]])) {
$col = $m[1];
$alias = $m[2];
if ($alias == '_pos_') continue;
$r .= $r ? ',' : '';
$r .= "\n `" . $alias . "` int UNSIGNED";
$added[$alias] = 1;
}
}
if ($has_order_infos) {
$r = "\n" . '`_pos_` mediumint NOT NULL AUTO_INCREMENT PRIMARY KEY, ' . $r;
}
return $r ? $r . "\n" : '';
}
function getFinalQueryResult($q_sql, $tmp_tbl) {
/* var names */
$vars = array();
$aggregate_vars = array();
foreach ($this->infos['query']['result_vars'] as $entry) {
if ($entry['aggregate']) {
$vars[] = $entry['alias'];
$aggregate_vars[] = $entry['alias'];
}
else {
$vars[] = $entry['var'];
}
}
/* result */
$r = array('variables' => $vars);
$v_sql = $this->getValueSQL($tmp_tbl, $q_sql);
//echo "\n\n" . $v_sql;
$t1 = ARC2::mtime();
$con = $this->store->getDBCon();
$rs = mysql_unbuffered_query($v_sql, $con);
if ($er = mysql_error($con)) {
$this->addError($er);
}
$t2 = ARC2::mtime();
$rows = array();
$types = array(0 => 'uri', 1 => 'bnode', 2 => 'literal');
if ($rs) {
while ($pre_row = mysql_fetch_array($rs)) {
$row = array();
foreach ($vars as $var) {
if (isset($pre_row[$var])) {
$row[$var] = $pre_row[$var];
$row[$var . ' type'] = isset($pre_row[$var . ' type']) ? $types[$pre_row[$var . ' type']] : (in_array($var, $aggregate_vars) ? 'literal' : 'uri');
if (isset($pre_row[$var . ' lang_dt']) && ($lang_dt = $pre_row[$var . ' lang_dt'])) {
if (preg_match('/^([a-z]+(\-[a-z0-9]+)*)$/i', $lang_dt)) {
$row[$var . ' lang'] = $lang_dt;
}
else {
$row[$var . ' datatype'] = $lang_dt;
}
}
}
}
if ($row || !$vars) {
$rows[] = $row;
}
}
}
$r['rows'] = $rows;
return $r;
}
/* */
function buildIndex($pattern, $id) {
$pattern['id'] = $id;
$type = $this->v('type', '', $pattern);
if (($type == 'filter') && $this->v('constraint', 0, $pattern)) {
$sub_pattern = $pattern['constraint'];
$sub_pattern['parent_id'] = $id;
$sub_id = $id . '_0';
$this->buildIndex($sub_pattern, $sub_id);
$pattern['constraint'] = $sub_id;
}
else {
$sub_patterns = $this->v('patterns', array(), $pattern);
$keys = array_keys($sub_patterns);
$spc = count($sub_patterns);
if (($spc > 4) && $this->pattern_order_offset) {
$keys = array();
for ($i = 0 ; $i < $spc; $i++) {
$keys[$i] = $i + $this->pattern_order_offset;
while ($keys[$i] >= $spc) $keys[$i] -= $spc;
}
}
foreach ($keys as $i => $key) {
$sub_pattern = $sub_patterns[$key];
$sub_pattern['parent_id'] = $id;
$sub_id = $id . '_' . $key;
$this->buildIndex($sub_pattern, $sub_id);
$pattern['patterns'][$i] = $sub_id;
if ($type == 'union') {
$this->index['union_branches'][] = $sub_id;
}
}
}
$this->index['patterns'][$id] = $pattern;
}
/* */
function analyzeIndex($pattern) {
$type = $this->v('type', '', $pattern);
if (!$type) {
//echo '<!-- ' . var_export($this->infos, 1) . ' -->';
return false;
}
$type = $pattern['type'];
$id = $pattern['id'];
/* triple */
if ($type == 'triple') {
foreach (array('s', 'p', 'o') as $term) {
if ($pattern[$term . '_type'] == 'var') {
$val = $pattern[$term];
$this->index['vars'][$val] = array_merge($this->v($val, array(), $this->index['vars']), array(array('table' => $pattern['id'], 'col' =>$term)));
}
if ($pattern[$term . '_type'] == 'bnode') {
$val = $pattern[$term];
$this->index['bnodes'][$val] = array_merge($this->v($val, array(), $this->index['bnodes']), array(array('table' => $pattern['id'], 'col' =>$term)));
}
}
$this->index['triple_patterns'][] = $pattern['id'];
/* joins */
if ($this->isOptionalPattern($id)) {
$this->index['left_join'][] = $id;
}
elseif (!$this->index['from']) {
$this->index['from'][] = $id;
}
elseif (!$this->getJoinInfos($id)) {
$this->index['from'][] = $id;
}
else {
$this->index['join'][] = $id;
}
/* graph infos, graph vars */
$this->index['patterns'][$id]['graph_infos'] = $this->getGraphInfos($id);
foreach ($this->index['patterns'][$id]['graph_infos'] as $info) {
if ($info['type'] == 'graph') {
if ($info['var']) {
$val = $info['var']['value'];
$this->index['graph_vars'][$val] = array_merge($this->v($val, array(), $this->index['graph_vars']), array(array('table' => $id)));
}
elseif ($info['uri']) {
$val = $info['uri'];
$this->index['graph_uris'][$val] = array_merge($this->v($val, array(), $this->index['graph_uris']), array(array('table' => $id)));
}
}
}
}
$sub_ids = $this->v('patterns', array(), $pattern);
foreach ($sub_ids as $sub_id) {
$this->analyzeIndex($this->getPattern($sub_id));
}
}
/* */
function getGraphInfos($id) {
$r = array();
if ($id) {
$pattern = $this->index['patterns'][$id];
$type = $pattern['type'];
/* graph */
if ($type == 'graph') {
$r[] = array('type' => 'graph', 'var' => $pattern['var'], 'uri' => $pattern['uri']);
}
$p_pattern = $this->index['patterns'][$pattern['parent_id']];
if (isset($p_pattern['graph_infos'])) {
return array_merge($p_pattern['graph_infos'], $r);
}
return array_merge($this->getGraphInfos($pattern['parent_id']), $r);
}
/* FROM / FROM NAMED */
else {
if (isset($this->infos['query']['dataset'])) {
foreach ($this->infos['query']['dataset'] as $set) {
$r[] = array_merge(array('type' => 'dataset'), $set);
}
}
}
return $r;
}
/* */
function getPattern($id) {
if (is_array($id)) {
return $id;
}
return $this->v($id, array(), $this->index['patterns']);
}
function getInitialPattern($id) {
return $this->v($id, array(), $this->initial_index['patterns']);
}
/* */
function getUnionIndexes($pre_index) {
$r = array();
$branches = array();
$min_depth = 1000;
/* only process branches with minimum depth */
foreach ($pre_index['union_branches'] as $id) {
$branches[$id] = count(preg_split('/\_/', $id));
$min_depth = min($min_depth, $branches[$id]);
}
foreach ($branches as $branch_id => $depth) {
if ($depth == $min_depth) {
$union_id = preg_replace('/\_[0-9]+$/', '', $branch_id);
$index = array('keeping' => $branch_id, 'union_branches' => array(), 'patterns' => $pre_index['patterns']);
$old_branches = $index['patterns'][$union_id]['patterns'];
$skip_id = ($old_branches[0] == $branch_id) ? $old_branches[1] : $old_branches[0];
$index['patterns'][$union_id]['type'] = 'group';
$index['patterns'][$union_id]['patterns'] = array($branch_id);
$has_sub_unions = 0;
foreach ($index['patterns'] as $pattern_id => $pattern) {
if (preg_match('/^' .$skip_id. '/', $pattern_id)) {
unset($index['patterns'][$pattern_id]);
}
elseif ($pattern['type'] == 'union') {
foreach ($pattern['patterns'] as $sub_union_branch_id) {
$index['union_branches'][] = $sub_union_branch_id;
}
}
}
if ($index['union_branches']) {
$r = array_merge($r, $this->getUnionIndexes($index));
}
else {
$r[] = $index;
}
}
}
return $r;
}
/* */
function isOptionalPattern($id) {
$pattern = $this->getPattern($id);
if ($this->v('type', '', $pattern) == 'optional') {
return 1;
}
if ($this->v('parent_id', '0', $pattern) == '0') {
return 0;
}
return $this->isOptionalPattern($pattern['parent_id']);
}
function getOptionalPattern($id) {
$pn = $this->getPattern($id);
do {
$pn = $this->getPattern($pn['parent_id']);
} while ($pn['parent_id'] && ($pn['type'] != 'optional'));
return $pn['id'];
}
function sameOptional($id, $id2) {
return $this->getOptionalPattern($id) == $this->getOptionalPattern($id2);
}
/* */
function isUnionPattern($id) {
$pattern = $this->getPattern($id);
if ($this->v('type', '', $pattern) == 'union') {
return 1;
}
if ($this->v('parent_id', '0', $pattern) == '0') {
return 0;
}
return $this->isUnionPattern($pattern['parent_id']);
}
/* */
function getValueTable($col) {
return $this->store->getTablePrefix() . (preg_match('/^(s|o)$/', $col) ? $col . '2val' : 'id2val');
}
function getGraphTable() {
return $this->store->getTablePrefix() . 'g2t';
}
/* */
function getQuerySQL() {
$nl = "\n";
$where_sql = $this->getWHERESQL(); /* pre-fills $index['sub_joins'] $index['constraints'] */
$order_sql = $this->getORDERSQL(); /* pre-fills $index['sub_joins'] $index['constraints'] */
return '' .
($this->is_union_query ? 'SELECT' : 'SELECT' . $this->getDistinctSQL()) . $nl .
$this->getResultVarsSQL() . $nl . /* fills $index['sub_joins'] */
$this->getFROMSQL() .
$this->getAllJoinsSQL() .
$this->getWHERESQL() .
$this->getGROUPSQL() .
$this->getORDERSQL() .
($this->is_union_query ? '' : $this->getLIMITSQL()) .
$nl .
'';
}
/* */
function getDistinctSQL() {
if ($this->is_union_query) {
return ($this->v('distinct', 0, $this->infos['query']) || $this->v('reduced', 0, $this->infos['query'])) ? '' : ' ALL';
}
return ($this->v('distinct', 0, $this->infos['query']) || $this->v('reduced', 0, $this->infos['query'])) ? ' DISTINCT' : '';
}
/* */
function getResultVarsSQL() {
$r = '';
$vars = $this->infos['query']['result_vars'];
$nl = "\n";
$added = array();
foreach ($vars as $var) {
$var_name = $var['var'];
$tbl_alias = '';
if ($tbl_infos = $this->getVarTableInfos($var_name, 0)) {
$tbl = $tbl_infos['table'];
$col = $tbl_infos['col'];
$tbl_alias = $tbl_infos['table_alias'];
}
elseif ($var_name == 1) {/* ASK query */
$r .= '1 AS `success`';
}
else {
$this->addError('Result variable "' .$var_name. '" not used in query.');
}
if ($tbl_alias) {
/* aggregate */
if ($var['aggregate']) {
$conv_code = '';
if (strtolower($var['aggregate']) != 'count') {
$tbl_alias = 'V_' . $tbl . '_' . $col . '.val';
$conv_code = '0 + ';
}
if (!isset($added[$var['alias']])) {
$r .= $r ? ',' . $nl . ' ' : ' ';
$distinct_code = (strtolower($var['aggregate']) == 'count') && $this->v('distinct', 0, $this->infos['query']) ? 'DISTINCT ' : '';
$r .= $var['aggregate'] . '(' . $conv_code . $distinct_code . $tbl_alias. ') AS `' . $var['alias'] . '`';
$added[$var['alias']] = 1;
}
}
/* normal var */
else {
if (!isset($added[$var_name])) {
$r .= $r ? ',' . $nl . ' ' : ' ';
$r .= $tbl_alias . ' AS `' . $var_name . '`';
$is_s = ($col == 's');
$is_p = ($col == 'p');
$is_o = ($col == 'o');
if ($tbl_alias == 'NULL') {
/* type / add in UNION queries? */
if ($is_s || $is_o) {
$r .= ', ' . $nl . ' NULL AS `' . $var_name . ' type`';
}
/* lang_dt / always add it in UNION queries, the var may be used as s/p/o */
if ($is_o || $this->is_union_query) {
$r .= ', ' . $nl . ' NULL AS `' . $var_name . ' lang_dt`';
}
}
else {
/* type */
if ($is_s || $is_o) {
$r .= ', ' . $nl . ' ' .$tbl_alias . '_type AS `' . $var_name . ' type`';
}
/* lang_dt / always add it in UNION queries, the var may be used as s/p/o */
if ($is_o) {
$r .= ', ' . $nl . ' ' .$tbl_alias . '_lang_dt AS `' . $var_name . ' lang_dt`';
}
elseif ($this->is_union_query) {
$r .= ', ' . $nl . ' NULL AS `' . $var_name . ' lang_dt`';
}
}
$added[$var_name] = 1;
}
}
if (!in_array($tbl_alias, $this->index['sub_joins'])) {
$this->index['sub_joins'][] = $tbl_alias;
}
}
}
return $r ? $r : '1 AS `success`';
}
function getVarTableInfos($var, $ignore_initial_index = 1) {
if ($var == '*') {
return array('table' => '', 'col' => '', 'table_alias' => '*');
}
if ($infos = $this->v($var, 0, $this->index['vars'])) {
$infos[0]['table_alias'] = 'T_' . $infos[0]['table'] . '.' . $infos[0]['col'];
return $infos[0];
}
if ($infos = $this->v($var, 0, $this->index['graph_vars'])) {
$infos[0]['col'] = 'g';
$infos[0]['table_alias'] = 'G_' . $infos[0]['table'] . '.' . $infos[0]['col'];
return $infos[0];
}
if ($this->is_union_query && !$ignore_initial_index) {
if (($infos = $this->v($var, 0, $this->initial_index['vars'])) || ($infos = $this->v($var, 0, $this->initial_index['graph_vars']))) {
if (!in_array($var, $this->infos['null_vars'])) {
$this->infos['null_vars'][] = $var;
}
$infos[0]['table_alias'] = 'NULL';
$infos[0]['col'] = !isset($infos[0]['col']) ? '' : $infos[0]['col'];
return $infos[0];
}
}
return 0;
}
/* */
function getFROMSQL() {
$from_ids = $this->index['from'];
$r = '';
foreach ($from_ids as $from_id) {
$r .= $r ? ', ' : '';
$r .= $this->getTripleTable($from_id) . ' T_' . $from_id;
}
/* MySQL 5 requires parentheses in case of multiple tables */
/* MySQL >5.5 (?) does not allow parentheses in case of a single table anymore! */
$r = (count($from_ids) > 1) ? '(' . $r . ')' : $r;
return $r ? 'FROM ' . $r : '';
}
/* */
function getOrderedJoinIDs() {
return array_merge($this->index['from'], $this->index['join'], $this->index['left_join']);
}
function getJoinInfos($id) {
$r = array();
$tbl_ids = $this->getOrderedJoinIDs();
$pattern = $this->getPattern($id);
foreach ($tbl_ids as $tbl_id) {
$tbl_pattern = $this->getPattern($tbl_id);
if ($tbl_id != $id) {
foreach (array('s', 'p', 'o') as $tbl_term) {
foreach (array('var', 'bnode', 'uri') as $term_type) {
if ($tbl_pattern[$tbl_term . '_type'] == $term_type) {
foreach (array('s', 'p', 'o') as $term) {
if (($pattern[$term . '_type'] == $term_type) && ($tbl_pattern[$tbl_term] == $pattern[$term])) {
$r[] = array('term' => $term, 'join_tbl' => $tbl_id, 'join_term' => $tbl_term);
}
}
}
}
}
}
}
return $r;
}
function getAllJoinsSQL() {
$js = $this->getJoins();
$ljs = $this->getLeftJoins();
$entries = array_merge($js, $ljs);
$id2code = array();
foreach ($entries as $entry) {
if (preg_match('/([^\s]+) ON (.*)/s', $entry, $m)) {
$id2code[$m[1]] = $entry;
}
}
$deps = array();
foreach ($id2code as $id => $code) {
$deps[$id]['rank'] = 0;
foreach ($id2code as $other_id => $other_code) {
$deps[$id]['rank'] += ($id != $other_id) && preg_match('/' . $other_id . '/', $code) ? 1 : 0;
$deps[$id][$other_id] = ($id != $other_id) && preg_match('/' . $other_id . '/', $code) ? 1 : 0;
}
}
$r = '';
do {
/* get next 0-rank */
$next_id = 0;
foreach ($deps as $id => $infos) {
if ($infos['rank'] == 0) {
$next_id = $id;
break;
}
}
if ($next_id) {
$r .= "\n" . $id2code[$next_id];
unset($deps[$next_id]);
foreach ($deps as $id => $infos) {
$deps[$id]['rank'] = 0;
unset($deps[$id][$next_id]);
foreach ($infos as $k => $v) {
if (!in_array($k, array('rank', $next_id))) {
$deps[$id]['rank'] += $v;
$deps[$id][$k] = $v;
}
}
}
}
}
while ($next_id);
if ($deps) {
$this->addError('Not all patterns could be rewritten to SQL JOINs');
}
return $r;
}
function getJoins() {
$r = array();
$nl = "\n";
foreach ($this->index['join'] as $id) {
$sub_r = $this->getJoinConditionSQL($id);
$r[] = 'JOIN ' . $this->getTripleTable($id) . ' T_' . $id . ' ON (' . $sub_r . $nl . ')';
}
foreach (array_merge($this->index['from'], $this->index['join']) as $id) {
if ($sub_r = $this->getRequiredSubJoinSQL($id)) {
$r[] = $sub_r;
}
}
return $r;
}
function getLeftJoins() {
$r = array();
$nl = "\n";
foreach ($this->index['left_join'] as $id) {
$sub_r = $this->getJoinConditionSQL($id);
$r[] = 'LEFT JOIN ' . $this->getTripleTable($id) . ' T_' . $id . ' ON (' . $sub_r . $nl . ')';
}
foreach ($this->index['left_join'] as $id) {
if ($sub_r = $this->getRequiredSubJoinSQL($id, 'LEFT')) {
$r[] = $sub_r;
}
}
return $r;
}
function getJoinConditionSQL($id) {
$r = '';
$nl = "\n";
$infos = $this->getJoinInfos($id);
$pattern = $this->getPattern($id);
$tbl = 'T_' . $id;
/* core dependency */
$d_tbls = $this->getDependentJoins($id);
foreach ($d_tbls as $d_tbl) {
if (preg_match('/^T_([0-9\_]+)\.[spo]+/', $d_tbl, $m) && ($m[1] != $id)) {
if ($this->isJoinedBefore($m[1], $id) && !in_array($m[1], array_merge($this->index['from'], $this->index['join']))) {
$r .= $r ? $nl . ' AND ' : $nl . ' ';
$r .= '(' . $d_tbl . ' IS NOT NULL)';
}
$this->logDependency($id, $d_tbl);
}
}
/* triple-based join info */
foreach ($infos as $info) {
if ($this->isJoinedBefore($info['join_tbl'], $id) && $this->joinDependsOn($id, $info['join_tbl'])) {
$r .= $r ? $nl . ' AND ' : $nl . ' ';
$r .= '(' . $tbl . '.' . $info['term'] . ' = T_' . $info['join_tbl'] . '.' . $info['join_term'] . ')';
}
}
/* filters etc */
if ($sub_r = $this->getPatternSQL($pattern, 'join__T_' . $id)) {
$r .= $r ? $nl . ' AND ' . $sub_r : $nl . ' ' . '(' . $sub_r . ')';
}
return $r;
}
/**
* A log of identified table join dependencies in getJoinConditionSQL
*
*/
function logDependency($id, $tbl) {
if (!isset($this->dependency_log[$id])) $this->dependency_log[$id] = array();
if (!in_array($tbl, $this->dependency_log[$id])) {
$this->dependency_log[$id][] = $tbl;
}
}
/**
* checks whether entries in the dependecy log could perhaps be optimized
* (triggers re-ordering of patterns
*/
function problematicDependencies() {
foreach ($this->dependency_log as $id => $tbls) {
if (count($tbls) > 1) return count($tbls);
}
return 0;
}
function isJoinedBefore($tbl_1, $tbl_2) {
$tbl_ids = $this->getOrderedJoinIDs();
foreach ($tbl_ids as $id) {
if ($id == $tbl_1) {
return 1;
}
if ($id == $tbl_2) {
return 0;
}
}
}
function joinDependsOn($id, $id2) {
if (in_array($id2, array_merge($this->index['from'], $this->index['join']))) {
return 1;
}
$d_tbls = $this->getDependentJoins($id2);
//echo $id . ' :: ' . $id2 . '=>' . print_r($d_tbls, 1);
foreach ($d_tbls as $d_tbl) {
if (preg_match('/^T_' .$id. '\./', $d_tbl)) {
return 1;
}
}
return 0;
}
function getDependentJoins($id) {
$r = array();
/* sub joins */
foreach ($this->index['sub_joins'] as $alias) {
if (preg_match('/^(T|V|G)_' . $id . '/', $alias)) {
$r[] = $alias;
}
}
/* siblings in shared optional */
$o_id = $this->getOptionalPattern($id);
foreach ($this->index['sub_joins'] as $alias) {
if (preg_match('/^(T|V|G)_' . $o_id . '/', $alias) && !in_array($alias, $r)) {
$r[] = $alias;
}
}
foreach ($this->index['left_join'] as $alias) {
if (preg_match('/^' . $o_id . '/', $alias) && !in_array($alias, $r)) {
$r[] = 'T_' . $alias . '.s';
}
}
return $r;
}
/* */
function getRequiredSubJoinSQL($id, $prefix = '') {/* id is a triple pattern id. Optional FILTERS and GRAPHs are getting added to the join directly */
$nl = "\n";
$r = '';
foreach ($this->index['sub_joins'] as $alias) {
if (preg_match('/^V_' . $id . '_([a-z\_]+)\.val$/', $alias, $m)) {
$col = $m[1];
$sub_r = '';
if ($this->isOptionalPattern($id)) {
$pattern = $this->getPattern($id);
do {
$pattern = $this->getPattern($pattern['parent_id']);
} while ($pattern['parent_id'] && ($pattern['type'] != 'optional'));
$sub_r = $this->getPatternSQL($pattern, 'sub_join__V_' . $id);
}
$sub_r = $sub_r ? $nl . ' AND (' . $sub_r . ')' : '';
/* lang dt only on literals */
if ($col == 'o_lang_dt') {
$sub_sub_r = 'T_' . $id . '.o_type = 2';
$sub_r .= $nl . ' AND (' . $sub_sub_r . ')';
}
//$cur_prefix = $prefix ? $prefix . ' ' : 'STRAIGHT_';
$cur_prefix = $prefix ? $prefix . ' ' : '';
if ($col == 'g') {
$r .= trim($cur_prefix . 'JOIN '. $this->getValueTable($col) . ' V_' .$id . '_' . $col. ' ON (' .$nl. ' (G_' . $id . '.' . $col. ' = V_' . $id. '_' . $col. '.id) ' . $sub_r . $nl . ')');
}
else {
$r .= trim($cur_prefix . 'JOIN '. $this->getValueTable($col) . ' V_' .$id . '_' . $col. ' ON (' .$nl. ' (T_' . $id . '.' . $col. ' = V_' . $id. '_' . $col. '.id) ' . $sub_r . $nl . ')');
}
}
elseif (preg_match('/^G_' . $id . '\.g$/', $alias, $m)) {
$pattern = $this->getPattern($id);
$sub_r = $this->getPatternSQL($pattern, 'graph_sub_join__G_' . $id);
$sub_r = $sub_r ? $nl . ' AND ' . $sub_r : '';
/* dataset restrictions */
$gi = $this->getGraphInfos($id);
$sub_sub_r = '';
$added_gts = array();
foreach ($gi as $set) {
if (isset($set['graph']) && !in_array($set['graph'], $added_gts)) {
$sub_sub_r .= $sub_sub_r !== '' ? ',' : '';
$sub_sub_r .= $this->getTermID($set['graph'], 'g');
$added_gts[] = $set['graph'];
}
}
$sub_r .= ($sub_sub_r !== '') ? $nl . ' AND (G_' . $id . '.g IN (' . $sub_sub_r . '))' : ''; // /* ' . str_replace('#' , '::', $set['graph']) . ' */';
/* other graph join conditions */
foreach ($this->index['graph_vars'] as $var => $occurs) {
$occur_tbls = array();
foreach ($occurs as $occur) {
$occur_tbls[] = $occur['table'];
if ($occur['table'] == $id) break;
}
foreach($occur_tbls as $tbl) {
if (($tbl != $id) && in_array($id, $occur_tbls) && $this->isJoinedBefore($tbl, $id)) {
$sub_r .= $nl . ' AND (G_' .$id. '.g = G_' .$tbl. '.g)';
}
}
}
//$cur_prefix = $prefix ? $prefix . ' ' : 'STRAIGHT_';
$cur_prefix = $prefix ? $prefix . ' ' : '';
$r .= trim($cur_prefix . 'JOIN '. $this->getGraphTable() . ' G_' .$id . ' ON (' .$nl. ' (T_' . $id . '.t = G_' .$id. '.t)' . $sub_r . $nl . ')');
}
}
return $r;
}
/* */
function getWHERESQL() {
$r = '';
$nl = "\n";
/* standard constraints */
$sub_r = $this->getPatternSQL($this->getPattern('0'), 'where');
/* additional constraints */
foreach ($this->index['from'] as $id) {
if ($sub_sub_r = $this->getConstraintSQL($id)) {
$sub_r .= $sub_r ? $nl . ' AND ' . $sub_sub_r : $sub_sub_r;
}
}
$r .= $sub_r ? $sub_r : '';
/* left join dependencies */
foreach ($this->index['left_join'] as $id) {
$d_joins = $this->getDependentJoins($id);
$added = array();
$d_aliases = array();
//echo $id . ' =>' . print_r($d_joins, 1);
$id_alias = 'T_' . $id . '.s';
foreach ($d_joins as $alias) {
if (preg_match('/^(T|V|G)_([0-9\_]+)(_[spo])?\.([a-z\_]+)/', $alias, $m)) {
$tbl_type = $m[1];
$tbl_pattern_id = $m[2];
$suffix = $m[3];
if (($tbl_pattern_id >= $id) && $this->sameOptional($tbl_pattern_id, $id)) {/* get rid of dependency permutations and nested optionals */
if (!in_array($tbl_type . '_' . $tbl_pattern_id . $suffix, $added)) {
$sub_r .= $sub_r ? ' AND ' : '';
$sub_r .= $alias . ' IS NULL';
$d_aliases[] = $alias;
$added[] = $tbl_type . '_' . $tbl_pattern_id . $suffix;
$id_alias = ($tbl_pattern_id == $id) ? $alias : $id_alias;
}
}
}
}
if (count($d_aliases) > 2) {/* @@todo fix this! */
$sub_r1 = ' /* '.$id_alias.' dependencies */';
$sub_r2 = '((' . $id_alias . ' IS NULL) OR (CONCAT(' . join(', ', $d_aliases) . ') IS NOT NULL))';
$r .= $r ? $nl . $sub_r1 . $nl . ' AND ' .$sub_r2 : $sub_r1 . $nl . $sub_r2;
}
}
return $r ? $nl . 'WHERE ' . $r : '';
}
/* */
function addConstraintSQLEntry($id, $sql) {
if (!isset($this->index['constraints'][$id])) {
$this->index['constraints'][$id] = array();
}
if (!in_array($sql, $this->index['constraints'][$id])) {
$this->index['constraints'][$id][] = $sql;
}
}
function getConstraintSQL($id) {
$r = '';
$nl = "\n";
$constraints = $this->v($id, array(), $this->index['constraints']);
foreach ($constraints as $constraint) {
$r .= $r ? $nl . ' AND ' . $constraint : $constraint;
}
return $r;
}
/* */
function getPatternSQL($pattern, $context) {
$type = $this->v('type', '', $pattern);
if (!$type) {
return '';
}
$m = 'get' . ucfirst($type) . 'PatternSQL';
return method_exists($this, $m) ? $this->$m($pattern, $context) : $this->getDefaultPatternSQL($pattern, $context);
}
function getDefaultPatternSQL($pattern, $context) {
$r = '';
$nl = "\n";
$sub_ids = $this->v('patterns', array(), $pattern);
foreach ($sub_ids as $sub_id) {
$sub_r = $this->getPatternSQL($this->getPattern($sub_id), $context);
$r .= ($r && $sub_r) ? $nl . ' AND (' . $sub_r . ')' : ($sub_r ? $sub_r : '');
}
return $r ? $r : '';
}
function getTriplePatternSQL($pattern, $context) {
$r = '';
$nl = "\n";
$id = $pattern['id'];
/* s p o */
$vars = array();
foreach (array('s', 'p', 'o') as $term) {
$sub_r = '';
$type = $pattern[$term . '_type'];
if ($type == 'uri') {
$term_id = $this->getTermID($pattern[$term], $term);
$sub_r = '(T_' . $id . '.' . $term . ' = ' . $term_id . ') /* ' . preg_replace('/[\#\*\>]/' , '::', $pattern[$term]) . ' */';
}
elseif ($type == 'literal') {
$term_id = $this->getTermID($pattern[$term], $term);
$sub_r = '(T_' . $id . '.' . $term . ' = ' . $term_id . ') /* ' . preg_replace('/[\#\n\*\>]/' , ' ', $pattern[$term]) . ' */';
if (($lang_dt = $this->v1($term . '_lang', '', $pattern)) || ($lang_dt = $this->v1($term . '_datatype', '', $pattern))) {
$lang_dt_id = $this->getTermID($lang_dt);
$sub_r .= $nl . ' AND (T_' . $id . '.' .$term. '_lang_dt = ' . $lang_dt_id . ') /* ' . preg_replace('/[\#\*\>]/' , '::', $lang_dt) . ' */';
}
}
elseif ($type == 'var') {
$val = $pattern[$term];
if (isset($vars[$val])) {/* repeated var in pattern */
$sub_r = '(T_' . $id . '.' . $term . '=' . 'T_' . $id . '.' . $vars[$val] . ')';
}
$vars[$val] = $term;
if ($infos = $this->v($val, 0, $this->index['graph_vars'])) {/* graph var in triple pattern */
$sub_r .= $sub_r ? $nl . ' AND ' : '';
$tbl = $infos[0]['table'];
$sub_r .= 'G_' . $tbl . '.g = T_' . $id . '.' . $term;
}
}
if ($sub_r) {
if (preg_match('/^(join)/', $context) || (preg_match('/^where/', $context) && in_array($id, $this->index['from']))) {
$r .= $r ? $nl . ' AND ' . $sub_r : $sub_r;
}
}
}
/* g */
if ($infos = $pattern['graph_infos']) {
$tbl_alias = 'G_' . $id . '.g';
if (!in_array($tbl_alias, $this->index['sub_joins'])) {
$this->index['sub_joins'][] = $tbl_alias;
}
$sub_r = array('graph_var' => '', 'graph_uri' => '', 'from' => '', 'from_named' => '');
foreach ($infos as $info) {
$type = $info['type'];
if ($type == 'graph') {
if ($info['uri']) {
$term_id = $this->getTermID($info['uri'], 'g');
$sub_r['graph_uri'] .= $sub_r['graph_uri'] ? $nl . ' AND ' : '';
$sub_r['graph_uri'] .= '(' .$tbl_alias. ' = ' . $term_id . ') /* ' . preg_replace('/[\#\*\>]/' , '::', $info['uri']) . ' */';
}
}
}
if ($sub_r['from'] && $sub_r['from_named']) {
$sub_r['from_named'] = '';
}
if (!$sub_r['from'] && !$sub_r['from_named']) {
$sub_r['graph_var'] = '';
}
if (preg_match('/^(graph_sub_join)/', $context)) {
foreach ($sub_r as $g_type => $g_sql) {
if ($g_sql) {
$r .= $r ? $nl . ' AND ' . $g_sql : $g_sql;
}
}
}
}
/* optional sibling filters? */
if (preg_match('/^(join|sub_join)/', $context) && $this->isOptionalPattern($id)) {
$o_pattern = $pattern;
do {
$o_pattern = $this->getPattern($o_pattern['parent_id']);
} while ($o_pattern['parent_id'] && ($o_pattern['type'] != 'optional'));
if ($sub_r = $this->getPatternSQL($o_pattern, 'optional_filter' . preg_replace('/^(.*)(__.*)$/', '\\2', $context))) {
$r .= $r ? $nl . ' AND ' . $sub_r : $sub_r;
}
/* created constraints */
if ($sub_r = $this->getConstraintSQL($id)) {
$r .= $r ? $nl . ' AND ' . $sub_r : $sub_r;
}
}
/* result */
if (preg_match('/^(where)/', $context) && $this->isOptionalPattern($id)) {
return '';
}
return $r;
}
/* */
function getFilterPatternSQL($pattern, $context) {
$r = '';
$id = $pattern['id'];
$constraint_id = $this->v1('constraint', '', $pattern);
$constraint = $this->getPattern($constraint_id);
$constraint_type = $constraint['type'];
if ($constraint_type == 'built_in_call') {
$r = $this->getBuiltInCallSQL($constraint, $context);
}
elseif ($constraint_type == 'expression') {
$r = $this->getExpressionSQL($constraint, $context, '', 'filter');
}
else {
$m = 'get' . ucfirst($constraint_type) . 'ExpressionSQL';
if (method_exists($this, $m)) {
$r = $this->$m($constraint, $context, '', 'filter');
}
}
if ($this->isOptionalPattern($id) && !preg_match('/^(join|optional_filter)/', $context)) {
return '';
}
/* unconnected vars in FILTERs eval to false */
$sub_r = $this->hasUnconnectedFilterVars($id);
if ($sub_r) {
if ($sub_r == 'alias') {
if (!in_array($r, $this->index['havings'])) $this->index['havings'][] = $r;
return '';
}
elseif (preg_match('/^T([^\s]+\.)g (.*)$/s', $r, $m)) {/* graph filter */
return 'G' . $m[1] . 't ' . $m[2];
}
elseif (preg_match('/^\(*V[^\s]+_g\.val .*$/s', $r, $m)) {/* graph value filter, @@improveMe */
//return $r;
}
else {
return 'FALSE';
}
}
/* some really ugly tweaks */
/* empty language filter: FILTER ( lang(?v) = '' ) */
$r = preg_replace('/\(\/\* language call \*\/ ([^\s]+) = ""\)/s', '((\\1 = "") OR (\\1 LIKE "%:%"))', $r);
return $r;
}
/**
* Checks if vars in the given (filter) pattern are used within the filter's scope.
*/
function hasUnconnectedFilterVars($filter_pattern_id) {
$scope_id = $this->getFilterScope($filter_pattern_id);
$vars = $this->getFilterVars($filter_pattern_id);
$r = 0;
foreach ($vars as $var_name) {
if ($this->isUsedTripleVar($var_name, $scope_id)) continue;
if ($this->isAliasVar($var_name)) {
$r = 'alias';
break;
}
$r = 1;
break;
}
return $r;
}
/**
* Returns the given filter pattern's scope (the id of the parent group pattern).
*/
function getFilterScope($filter_pattern_id) {
$patterns = $this->initial_index['patterns'];
$r = '';
foreach ($patterns as $id => $p) {
/* the id has to be sub-part of the given filter id */
if (!preg_match('/^' . $id . '.+/', $filter_pattern_id)) continue;
/* we are looking for a group or union */
if (!preg_match('/^(group|union)$/', $p['type'])) continue;
/* we are looking for the longest/deepest match */
if (strlen($id) > strlen($r)) $r = $id;
}
return $r;
}
/**
* Builds a list of vars used in the given (filter) pattern.
*/
function getFilterVars($filter_pattern_id) {
$r = array();
$patterns = $this->initial_index['patterns'];
/* find vars in the given filter (i.e. the given id is part of their pattern id) */
foreach ($patterns as $id => $p) {
if (!preg_match('/^' . $filter_pattern_id . '.+/', $id)) continue;
$var_name = '';
if ($p['type'] == 'var') {
$var_name = $p['value'];
}
elseif (($p['type'] == 'built_in_call') && ($p['call'] == 'bound')) {
$var_name = $p['args'][0]['value'];
}
if ($var_name && !in_array($var_name, $r)) {
$r[] = $var_name;
}
}
return $r;
}
/**
* Checks if $var_name appears as result projection alias.
*/
function isAliasVar($var_name) {
foreach ($this->infos['query']['result_vars'] as $r_var) {
if ($r_var['alias'] == $var_name) return 1;
}
return 0;
}
/**
* Checks if $var_name is used in a triple pattern in the given scope
*/
function isUsedTripleVar($var_name, $scope_id = '0') {
$patterns = $this->initial_index['patterns'];
foreach ($patterns as $id => $p) {
if ($p['type'] != 'triple') continue;
if (!preg_match('/^' . $scope_id . '.+/', $id)) continue;
foreach (array('s', 'p', 'o') as $term) {
if ($p[$term . '_type'] != 'var') continue;
if ($p[$term] == $var_name) return 1;
}
}
}
/* */
function getExpressionSQL($pattern, $context, $val_type = '', $parent_type = '') {
$r = '';
$nl = "\n";
$type = $this->v1('type', '', $pattern);
$sub_type = $this->v1('sub_type', $type, $pattern);
if (preg_match('/^(and|or)$/', $sub_type)) {
foreach ($pattern['patterns'] as $sub_id) {
$sub_pattern = $this->getPattern($sub_id);
$sub_pattern_type = $sub_pattern['type'];
if ($sub_pattern_type == 'built_in_call') {
$sub_r = $this->getBuiltInCallSQL($sub_pattern, $context, '', $parent_type);
}
else {
$sub_r = $this->getExpressionSQL($sub_pattern, $context, '', $parent_type);
}
if ($sub_r) {
$r .= $r ? ' ' . strtoupper($sub_type). ' (' .$sub_r. ')' : '(' . $sub_r . ')';
}
}
}
elseif ($sub_type == 'built_in_call') {
$r = $this->getBuiltInCallSQL($pattern, $context, $val_type, $parent_type);
}
elseif (preg_match('/literal/', $sub_type)) {
$r = $this->getLiteralExpressionSQL($pattern, $context, $val_type, $parent_type);
}
elseif ($sub_type) {
$m = 'get' . ucfirst($sub_type) . 'ExpressionSQL';
if (method_exists($this, $m)) {
$r = $this->$m($pattern, $context, '', $parent_type);
}
}
/* skip expressions that reference non-yet-joined tables */
if (preg_match('/__(T|V|G)_(.+)$/', $context, $m)) {
$context_pattern_id = $m[2];
$context_table_type = $m[1];
if (preg_match_all('/((T|V|G)(\_[0-9])+)/', $r, $m)) {
$aliases = $m[1];
$keep = 1;
foreach ($aliases as $alias) {
if (preg_match('/(T|V|G)_(.*)$/', $alias, $m)) {
$tbl_type = $m[1];
$tbl = $m[2];
if (!$this->isJoinedBefore($tbl, $context_pattern_id)) {
$keep = 0;
}
elseif (($context_pattern_id == $tbl) && preg_match('/(TV)/', $context_table_type . $tbl_type)) {
$keep = 0;
}
}
}
$r = $keep ? $r : '';
}
}
return $r ? '(' . $r . ')' : $r;
}
function detectExpressionValueType($pattern_ids) {
foreach ($pattern_ids as $id) {
$pattern = $this->getPattern($id);
$type = $this->v('type', '', $pattern);
if (($type == 'literal') && isset($pattern['datatype'])) {
if (in_array($pattern['datatype'], array($this->xsd . 'integer', $this->xsd . 'float', $this->xsd . 'double'))) {
return 'numeric';
}
}
}
return '';
}
/* */
function getRelationalExpressionSQL($pattern, $context, $val_type = '', $parent_type = '') {
$r = '';
$val_type = $this->detectExpressionValueType($pattern['patterns']);
$op = $pattern['operator'];
foreach ($pattern['patterns'] as $sub_id) {
$sub_pattern = $this->getPattern($sub_id);
$sub_pattern['parent_op'] = $op;
$sub_type = $sub_pattern['type'];
$m = ($sub_type == 'built_in_call') ? 'getBuiltInCallSQL' : 'get' . ucfirst($sub_type) . 'ExpressionSQL';
$m = str_replace('ExpressionExpression', 'Expression', $m);
$sub_r = method_exists($this, $m) ? $this->$m($sub_pattern, $context, $val_type, 'relational') : '';
$r .= $r ? ' ' . $op . ' ' . $sub_r : $sub_r;
}
return $r ? '(' . $r . ')' : $r;
}
function getAdditiveExpressionSQL($pattern, $context, $val_type = '', $parent_type = '') {
$r = '';
$val_type = $this->detectExpressionValueType($pattern['patterns']);
foreach ($pattern['patterns'] as $sub_id) {
$sub_pattern = $this->getPattern($sub_id);
$sub_type = $this->v('type', '', $sub_pattern);
$m = ($sub_type == 'built_in_call') ? 'getBuiltInCallSQL' : 'get' . ucfirst($sub_type) . 'ExpressionSQL';
$m = str_replace('ExpressionExpression', 'Expression', $m);
$sub_r = method_exists($this, $m) ? $this->$m($sub_pattern, $context, $val_type, 'additive') : '';
$r .= $r ? ' ' . $sub_r : $sub_r;
}
return $r;
}
function getMultiplicativeExpressionSQL($pattern, $context, $val_type = '', $parent_type = '') {
$r = '';
$val_type = $this->detectExpressionValueType($pattern['patterns']);
foreach ($pattern['patterns'] as $sub_id) {
$sub_pattern = $this->getPattern($sub_id);
$sub_type = $sub_pattern['type'];
$m = ($sub_type == 'built_in_call') ? 'getBuiltInCallSQL' : 'get' . ucfirst($sub_type) . 'ExpressionSQL';
$m = str_replace('ExpressionExpression', 'Expression', $m);
$sub_r = method_exists($this, $m) ? $this->$m($sub_pattern, $context, $val_type, 'multiplicative') : '';
$r .= $r ? ' ' . $sub_r : $sub_r;
}
return $r;
}
/* */
function getVarExpressionSQL($pattern, $context, $val_type = '', $parent_type = '') {
$var = $pattern['value'];
$info = $this->getVarTableInfos($var);
if (!$tbl = $info['table']) {
/* might be an aggregate var */
$vars = $this->infos['query']['result_vars'];
foreach ($vars as $test_var) {
if ($test_var['alias'] == $pattern['value']) {
return '`' . $pattern['value'] . '`';
}
}
return '';
}
$col = $info['col'];
if (($context == 'order') && ($col == 'o')) {
$tbl_alias = 'T_' . $tbl . '.o_comp';
}
elseif ($context == 'sameterm') {
$tbl_alias = 'T_' . $tbl . '.' . $col;
}
elseif (($parent_type == 'relational') && ($col == 'o') && (preg_match('/[\<\>]/', $this->v('parent_op', '', $pattern)))) {
$tbl_alias = 'T_' . $tbl . '.o_comp';
}
else {
$tbl_alias = 'V_' . $tbl . '_' . $col . '.val';
if (!in_array($tbl_alias, $this->index['sub_joins'])) {
$this->index['sub_joins'][] = $tbl_alias;
}
}
$op = $this->v('operator', '', $pattern);
if (preg_match('/^(filter|and)/', $parent_type)) {
if ($op == '!') {
$r = '(((' . $tbl_alias . ' = 0) AND (CONCAT("1", ' . $tbl_alias . ') != 1))'; /* 0 and no string */
$r .= ' OR (' . $tbl_alias . ' IN ("", "false")))'; /* or "", or "false" */
}
else {
$r = '((' . $tbl_alias . ' != 0)'; /* not null */
$r .= ' OR ((CONCAT("1", ' . $tbl_alias . ') = 1) AND (' . $tbl_alias . ' NOT IN ("", "false"))))'; /* string, and not "" or "false" */
}
}
else {
$r = trim($op . ' ' . $tbl_alias);
if ($val_type == 'numeric') {
if (preg_match('/__(T|V|G)_(.+)$/', $context, $m)) {
$context_pattern_id = $m[2];
$context_table_type = $m[1];
}
else {
$context_pattern_id = $pattern['id'];
$context_table_type = 'T';
}
if ($this->isJoinedBefore($tbl, $context_pattern_id)) {
$add = ($tbl != $context_pattern_id) ? 1 : 0;
$add = (!$add && ($context_table_type == 'V')) ? 1 : 0;
if ($add) {
$this->addConstraintSQLEntry($context_pattern_id, '(' .$r. ' = "0" OR ' . $r . '*1.0 != 0)');
}
}
}
}
return $r;
}
/* */
function getUriExpressionSQL($pattern, $context, $val_type = '') {
$val = $pattern['uri'];
$r = $pattern['operator'];
$r .= is_numeric($val) ? ' ' . $val : ' "' . mysql_real_escape_string($val, $this->store->getDBCon()) . '"';
return $r;
}
/* */
function getLiteralExpressionSQL($pattern, $context, $val_type = '', $parent_type = '') {
$val = $pattern['value'];
$r = $pattern['operator'];
if (is_numeric($val) && $this->v('datatype', 0, $pattern)) {
$r .= ' ' . $val;
}
elseif (preg_match('/^(true|false)$/i', $val) && ($this->v1('datatype', '', $pattern) == 'http://www.w3.org/2001/XMLSchema#boolean')) {
$r .= ' ' . strtoupper($val);
}
elseif ($parent_type == 'regex') {
$sub_r = mysql_real_escape_string($val, $this->store->getDBCon());
$r .= ' "' . preg_replace('/\x5c\x5c/', '\\', $sub_r) . '"';
}
else {
$r .= ' "' . mysql_real_escape_string($val, $this->store->getDBCon()) . '"';
}
if (($lang_dt = $this->v1('lang', '', $pattern)) || ($lang_dt = $this->v1('datatype', '', $pattern))) {
/* try table/alias via var in siblings */
if ($var = $this->findSiblingVarExpression($pattern['id'])) {
if (isset($this->index['vars'][$var])) {
$infos = $this->index['vars'][$var];
foreach ($infos as $info) {
if ($info['col'] == 'o') {
$tbl = $info['table'];
$term_id = $this->getTermID($lang_dt);
if ($pattern['operator'] != '!=') {
if (preg_match('/__(T|V|G)_(.+)$/', $context, $m)) {
$context_pattern_id = $m[2];
$context_table_type = $m[1];
}
elseif ($context == 'where') {
$context_pattern_id = $tbl;
}
else {
$context_pattern_id = $pattern['id'];
}
if ($tbl == $context_pattern_id) {/* @todo better dependency check */
if ($term_id || ($lang_dt != 'http://www.w3.org/2001/XMLSchema#integer')) {/* skip if simple int, but no id */
$this->addConstraintSQLEntry($context_pattern_id, 'T_' . $tbl . '.o_lang_dt = ' . $term_id . ' /* ' . preg_replace('/[\#\*\>]/' , '::', $lang_dt) . ' */');
}
}
}
break;
}
}
}
}
}
return trim($r);
}
function findSiblingVarExpression($id) {
$pattern = $this->getPattern($id);
do {
$pattern = $this->getPattern($pattern['parent_id']);
} while ($pattern['parent_id'] && ($pattern['type'] != 'expression'));
$sub_patterns = $this->v('patterns', array(), $pattern);
foreach ($sub_patterns as $sub_id) {
$sub_pattern = $this->getPattern($sub_id);
if ($sub_pattern['type'] == 'var') {
return $sub_pattern['value'];
}
}
return '';
}
/* */
function getFunctionExpressionSQL($pattern, $context, $val_type = '', $parent_type = '') {
$fnc_uri = $pattern['uri'];
$op = $this->v('operator', '', $pattern);
if ($op) $op .= ' ';
if ($this->allow_extension_functions) {
/* mysql functions */
if (preg_match('/^http\:\/\/web\-semantics\.org\/ns\/mysql\/(.*)$/', $fnc_uri, $m)) {
$fnc_name = strtoupper($m[1]);
$sub_r = '';
foreach ($pattern['args'] as $arg) {
$sub_r .= $sub_r ? ', ' : '';
$sub_r .= $this->getExpressionSQL($arg, $context, $val_type, $parent_type);
}
return $op . $fnc_name . '(' . $sub_r . ')';
}
/* any other: ignore */
}
/* simple type conversions */
if (strpos($fnc_uri, 'http://www.w3.org/2001/XMLSchema#') === 0) {
return $op . $this->getExpressionSQL($pattern['args'][0], $context, $val_type, $parent_type);
}
return '';
}
/* */
function getBuiltInCallSQL($pattern, $context) {
$call = $pattern['call'];
$m = 'get' . ucfirst($call) . 'CallSQL';
if (method_exists($this, $m)) {
return $this->$m($pattern, $context);
}
else {
$this->addError('Unknown built-in call "' . $call . '"');
}
return '';
}
function getBoundCallSQL($pattern, $context) {
$r = '';
$var = $pattern['args'][0]['value'];
$info = $this->getVarTableInfos($var);
if (!$tbl = $info['table']) {
return '';
}
$col = $info['col'];
$tbl_alias = 'T_' . $tbl . '.' . $col;
if ($pattern['operator'] == '!') {
return $tbl_alias . ' IS NULL';
}
return $tbl_alias . ' IS NOT NULL';
}
function getHasTypeCallSQL($pattern, $context, $type) {
$r = '';
$var = $pattern['args'][0]['value'];
$info = $this->getVarTableInfos($var);
if (!$tbl = $info['table']) {
return '';
}
$col = $info['col'];
$tbl_alias = 'T_' . $tbl . '.' . $col . '_type';
return $tbl_alias . ' ' .$this->v('operator', '', $pattern) . '= ' . $type;
}
function getIsliteralCallSQL($pattern, $context) {
return $this->getHasTypeCallSQL($pattern, $context, 2);
}
function getIsblankCallSQL($pattern, $context) {
return $this->getHasTypeCallSQL($pattern, $context, 1);
}
function getIsiriCallSQL($pattern, $context) {
return $this->getHasTypeCallSQL($pattern, $context, 0);
}
function getIsuriCallSQL($pattern, $context) {
return $this->getHasTypeCallSQL($pattern, $context, 0);
}
function getStrCallSQL($pattern, $context) {
$sub_pattern = $pattern['args'][0];
$sub_type = $sub_pattern['type'];
$m = 'get' . ucfirst($sub_type) . 'ExpressionSQL';
if (method_exists($this, $m)) {
return $this->$m($sub_pattern, $context);
}
}
function getFunctionCallSQL($pattern, $context) {
$f_uri = $pattern['uri'];
if (preg_match('/(integer|double|float|string)$/', $f_uri)) {/* skip conversions */
$sub_pattern = $pattern['args'][0];
$sub_type = $sub_pattern['type'];
$m = 'get' . ucfirst($sub_type) . 'ExpressionSQL';
if (method_exists($this, $m)) {
return $this->$m($sub_pattern, $context);
}
}
}
function getLangDatatypeCallSQL($pattern, $context) {
$r = '';
if (isset($pattern['patterns'])) { /* proceed with first argument only (assumed as base type for type promotion) */
$sub_pattern = array('args' => array($pattern['patterns'][0]));
return $this->getLangDatatypeCallSQL($sub_pattern, $context);
}
if (!isset($pattern['args'])) {
return 'FALSE';
}
$sub_type = $pattern['args'][0]['type'];
if ($sub_type != 'var') {
return $this->getLangDatatypeCallSQL($pattern['args'][0], $context);
}
$var = $pattern['args'][0]['value'];
$info = $this->getVarTableInfos($var);
if (!$tbl = $info['table']) {
return '';
}
$col = 'o_lang_dt';
$tbl_alias = 'V_' . $tbl . '_' . $col . '.val';
if (!in_array($tbl_alias, $this->index['sub_joins'])) {
$this->index['sub_joins'][] = $tbl_alias;
}
$op = $this->v('operator', '', $pattern);
$r = trim($op . ' ' . $tbl_alias);
return $r;
}
function getDatatypeCallSQL($pattern, $context) {
return '/* datatype call */ ' . $this->getLangDatatypeCallSQL($pattern, $context);
}
function getLangCallSQL($pattern, $context) {
return '/* language call */ ' . $this->getLangDatatypeCallSQL($pattern, $context);
}
function getLangmatchesCallSQL($pattern, $context) {
if (count($pattern['args']) == 2) {
$arg_1 = $pattern['args'][0];
$arg_2 = $pattern['args'][1];
$sub_r_1 = $this->getBuiltInCallSQL($arg_1, $context);/* adds value join */
$sub_r_2 = $this->getExpressionSQL($arg_2, $context);
$op = $this->v('operator', '', $pattern);
if (preg_match('/^([\"\'])([^\'\"]+)/', $sub_r_2, $m)) {
if ($m[2] == '*') {
$r = ($op == '!') ? 'NOT (' . $sub_r_1 . ' REGEXP "^[a-zA-Z\-]+$"' . ')' : $sub_r_1 . ' REGEXP "^[a-zA-Z\-]+$"';
}
else {
$r = ($op == '!') ? $sub_r_1 . ' NOT LIKE ' . $m[1] . $m[2] . '%' . $m[1] : $sub_r_1 . ' LIKE ' . $m[1] . $m[2] . '%' . $m[1];
}
}
else {
$r = ($op == '!') ? $sub_r_1 . ' NOT LIKE CONCAT(' . $sub_r_2 . ', "%")' : $sub_r_1 . ' LIKE CONCAT(' . $sub_r_2 . ', "%")';
}
return $r;
}
return '';
}
function getSametermCallSQL($pattern, $context) {
if (count($pattern['args']) == 2) {
$arg_1 = $pattern['args'][0];
$arg_2 = $pattern['args'][1];
$sub_r_1 = $this->getExpressionSQL($arg_1, 'sameterm');
$sub_r_2 = $this->getExpressionSQL($arg_2, 'sameterm');
$op = $this->v('operator', '', $pattern);
$r = $sub_r_1 . ' ' . $op . '= ' . $sub_r_2;
return $r;
}
return '';
}
function getRegexCallSQL($pattern, $context) {
$ac = count($pattern['args']);
if ($ac >= 2) {
foreach ($pattern['args'] as $i => $arg) {
$var = 'sub_r_' . ($i + 1);
$$var = $this->getExpressionSQL($arg, $context, '', 'regex');
}
$sub_r_3 = (isset($sub_r_3) && preg_match('/[\"\'](.+)[\"\']/', $sub_r_3, $m)) ? strtolower($m[1]) : '';
$op = ($this->v('operator', '', $pattern) == '!') ? ' NOT' : '';
if (!$sub_r_1 || !$sub_r_2) return '';
$is_simple_search = preg_match('/^[\(\"]+(\^)?([a-z0-9\_\-\s]+)(\$)?[\)\"]+$/is', $sub_r_2, $m);
$is_simple_search = preg_match('/^[\(\"]+(\^)?([^\\\*\[\]\}\{\(\)\"\'\?\+\.]+)(\$)?[\)\"]+$/is', $sub_r_2, $m);
$is_o_search = preg_match('/o\.val\)*$/', $sub_r_1);
/* fulltext search (may have "|") */
if ($is_simple_search && $is_o_search && !$op && (strlen($m[2]) > 8) && $this->store->hasFulltextIndex()) {
/* MATCH variations */
if (($val_parts = preg_split('/\|/', $m[2]))) {
return 'MATCH(' . trim($sub_r_1, '()') . ') AGAINST("' . join(' ', $val_parts) . '")';
}
else {
return 'MATCH(' . trim($sub_r_1, '()') . ') AGAINST("' . $m[2] . '")';
}
}
if (preg_match('/\|/', $sub_r_2)) $is_simple_search = 0;
/* LIKE */
if ($is_simple_search && ($sub_r_3 == 'i')) {
$sub_r_2 = $m[1] ? $m[2] : '%' . $m[2];
$sub_r_2 .= isset($m[3]) && $m[3] ? '' : '%';
return $sub_r_1 . $op . ' LIKE "' . $sub_r_2 . '"';
}
/* REGEXP */
$opt = ($sub_r_3 == 'i') ? '' : 'BINARY ';
return $sub_r_1 . $op . ' REGEXP ' . $opt . $sub_r_2;
}
return '';
}
/* */
function getGROUPSQL() {
$r = '';
$nl = "\n";
$infos = $this->v('group_infos', array(), $this->infos['query']);
foreach ($infos as $info) {
$var = $info['value'];
if ($tbl_infos = $this->getVarTableInfos($var, 0)) {
$tbl_alias = $tbl_infos['table_alias'];
$r .= $r ? ', ' : 'GROUP BY ';
$r .= $tbl_alias;
}
}
$hr = '';
foreach ($this->index['havings'] as $having) {
$hr .= $hr ? ' AND' : ' HAVING';
$hr .= '(' . $having . ')';
}
$r .= $hr;
return $r ? $nl . $r : $r;
}
/* */
function getORDERSQL() {
$r = '';
$nl = "\n";
$infos = $this->v('order_infos', array(), $this->infos['query']);
foreach ($infos as $info) {
$type = $info['type'];
$ms = array('expression' => 'getExpressionSQL', 'built_in_call' => 'getBuiltInCallSQL', 'function_call' => 'getFunctionCallSQL');
$m = isset($ms[$type]) ? $ms[$type] : 'get' . ucfirst($type) . 'ExpressionSQL';
if (method_exists($this, $m)) {
$sub_r = '(' . $this->$m($info, 'order') . ')';
$sub_r .= $this->v('direction', '', $info) == 'desc' ? ' DESC' : '';
$r .= $r ? ',' .$nl . $sub_r : $sub_r;
}
}
return $r ? $nl . 'ORDER BY ' . $r : '';
}
/* */
function getLIMITSQL() {
$r = '';
$nl = "\n";
$limit = $this->v('limit', -1, $this->infos['query']);
$offset = $this->v('offset', -1, $this->infos['query']);
if ($limit != -1) {
$offset = ($offset == -1) ? 0 : mysql_real_escape_string($offset, $this->store->getDBCon());
$r = 'LIMIT ' . $offset . ',' . $limit;
}
elseif ($offset != -1) {
$r = 'LIMIT ' . mysql_real_escape_string($offset, $this->store->getDBCon()) . ',999999999999'; /* mysql doesn't support stand-alone offsets .. */
}
return $r ? $nl . $r : '';
}
/* */
function getValueSQL($q_tbl, $q_sql) {
$r = '';
/* result vars */
$vars = $this->infos['query']['result_vars'];
$nl = "\n";
$v_tbls = array('JOIN' => array(), 'LEFT JOIN' => array());
$vc = 1;
foreach ($vars as $var) {
$var_name = $var['var'];
$r .= $r ? ',' . $nl . ' ' : ' ';
$col = '';
$tbl = '';
if ($var_name != '*') {
if (in_array($var_name, $this->infos['null_vars'])) {
if (isset($this->initial_index['vars'][$var_name])) {
$col = $this->initial_index['vars'][$var_name][0]['col'];
$tbl = $this->initial_index['vars'][$var_name][0]['table'];
}
if (isset($this->initial_index['graph_vars'][$var_name])) {
$col = 'g';
$tbl = $this->initial_index['graph_vars'][$var_name][0]['table'];
}
}
elseif (isset($this->index['vars'][$var_name])) {
$col = $this->index['vars'][$var_name][0]['col'];
$tbl = $this->index['vars'][$var_name][0]['table'];
}
}
if ($var['aggregate']) {
$r .= 'TMP.`' . $var['alias'] . '`';
}
else {
$join_type = in_array($tbl, array_merge($this->index['from'], $this->index['join'])) ? 'JOIN' : 'LEFT JOIN';/* val may be NULL */
$v_tbls[$join_type][] = array('t_col' => $col, 'q_col' => $var_name, 'vc' => $vc);
$r .= 'V' . $vc . '.val AS `' . $var_name . '`';
if (in_array($col, array('s', 'o'))) {
if (strpos($q_sql, '`' . $var_name . ' type`')) {
$r .= ', ' . $nl . ' TMP.`' . $var_name . ' type` AS `' . $var_name . ' type`';
//$r .= ', ' . $nl . ' CASE TMP.`' . $var_name . ' type` WHEN 2 THEN "literal" WHEN 1 THEN "bnode" ELSE "uri" END AS `' . $var_name . ' type`';
}
else {
$r .= ', ' . $nl . ' NULL AS `' . $var_name . ' type`';
}
}
$vc++;
if ($col == 'o') {
$v_tbls[$join_type][] = array('t_col' => 'id', 'q_col' => $var_name . ' lang_dt', 'vc' => $vc);
if (strpos($q_sql, '`' . $var_name . ' lang_dt`')) {
$r .= ', ' .$nl. ' V' . $vc . '.val AS `' . $var_name . ' lang_dt`';
$vc++;
}
else {
$r .= ', ' .$nl. ' NULL AS `' . $var_name . ' lang_dt`';
}
}
}
}
if (!$r) $r = '*';
/* from */
$r .= $nl . 'FROM (' . $q_tbl . ' TMP)';
foreach (array('JOIN', 'LEFT JOIN') as $join_type) {
foreach ($v_tbls[$join_type] as $v_tbl) {
$tbl = $this->getValueTable($v_tbl['t_col']);
$var_name = preg_replace('/^([^\s]+)(.*)$/', '\\1', $v_tbl['q_col']);
$cur_join_type = in_array($var_name, $this->infos['null_vars']) ? 'LEFT JOIN' : $join_type;
if (!strpos($q_sql, '`' . $v_tbl['q_col'].'`')) continue;
$r .= $nl . ' ' . $cur_join_type . ' ' . $tbl . ' V' . $v_tbl['vc'] . ' ON (
(V' . $v_tbl['vc'] . '.id = TMP.`' . $v_tbl['q_col'].'`)
)';
}
}
/* create pos columns, id needed */
if ($this->v('order_infos', array(), $this->infos['query'])) {
$r .= $nl . ' ORDER BY _pos_';
}
return 'SELECT' . $nl . $r;
}
/* */
}