Index: t3lib/class.t3lib_db.php
===================================================================
--- t3lib/class.t3lib_db.php	(revision 9218)
+++ t3lib/class.t3lib_db.php	(revision )
@@ -310,7 +310,67 @@
 				);
 	}
 
+
 	/**
+	 * Creates and executes a SELECT query, selecting fields ($select) from four tables joined
+	 * Use $tripleTable together with $subjectTable, $predicateTable or $objectTable to select over two tables. Or use all four tables to select a full MMM-relation.
+	 * The JOIN is done with triple.subject_uid <--> subject.uid / triple.predicate_uid <--> predicate.uid / triple.object_uid <--> object.uid
+	 * The function is very useful for selecting MMM-relations like RDF triples
+	 *
+	 * @param	string		Field list for SELECT
+	 * @param	string		Tablename, triple table, renamed to triple
+	 * @param	string		Tablename, subject table, renamed to subject
+	 * @param	string		Optional Tablename, predicate table, renamed to predicate
+	 * @param	string		Optional Tablename, object table, renamed to object
+	 * @param	string		Optional additional WHERE clauses put in the end of the query. NOTICE: You must escape values in this argument with $this->fullQuoteStr() yourself! DO NOT PUT IN GROUP BY, ORDER BY or LIMIT! You have to prepend 'AND ' to this parameter yourself!
+	 * @param	string		Optional GROUP BY field(s), if none, supply blank string.
+	 * @param	string		Optional ORDER BY field(s), if none, supply blank string.
+	 * @param	string		Optional LIMIT value ([begin,]max), if none, supply blank string.
+	 * @return	pointer		MySQL result pointer / DBAL object
+	 * @see exec_SELECTquery()
+	 */
+	public function exec_SELECT_getRowsByTriple($select, $tripleTable, $subjectTable, $predicateTable, $objectTable, $whereClause = '', $groupBy = '', $orderBy = '', $limit = '') {
+
+		if($subjectTable) {
+			$tripleWhere =  'triple.subject_table=' . $this->fullQuoteStr($subjectTable,$tripleTable) . ' AND subject.uid=triple.subject_uid';
+		}
+		if($subjectTable && ($predicateTable || $objectTable)) {
+			$tripleWhere .= ' AND ';
+		}
+
+		$tables = $tripleTable ? $tripleTable . ' AS triple,' : '';
+		$tables .= ',' . $subjectTable . ' AS subject';
+
+		if ($predicateTable) {
+			$tripleWhere .= 'triple.predicate_table=' .  $this->fullQuoteStr($predicateTable,$tripleTable) .' AND predicate.uid=triple.predicate_uid';
+			if($objectTable) {
+				$tripleWhere .=  ' AND ';
+			}
+
+			$tables .= ',' . $predicateTable . ' AS predicate';
+		}
+
+		if ($objectTable) {
+			$tripleWhere .= 'triple.object_table=' .  $this->fullQuoteStr($objectTable,$tripleTable) . ' AND object.uid=triple.object_uid';
+
+			$tables .= ',' . $objectTable . ' AS object';
+		}
+
+		if($whereClause) {
+			$tripleWhere =  '(' . $tripleWhere . ') AND ' . $whereClause;
+		}
+
+		return $this->exec_SELECTquery(
+					$select,
+					$tables,
+					$tripleWhere,
+					$groupBy,
+					$orderBy,
+					$limit
+				);
+	}
+	
+	/**
 	 * Executes a select based on input query parts array
 	 *
 	 * Usage: 9
@@ -1596,4 +1656,4 @@
 	include_once($TYPO3_CONF_VARS[TYPO3_MODE]['XCLASS']['t3lib/class.t3lib_db.php']);
 }
 
-?>
\ No newline at end of file
+?>