Merge pull request #271 from owncloud/239_webdav_999_files

fixes #239 - query the database in chunks of 200

lib/connector/sabre/directory.php

@@ -116,7 +116,6 @@ class OC_Connector_Sabre_Directory extends OC_Connector_Sabre_Node implements Sa
 	 * @return Sabre_DAV_INode[]
 	 */
 	public function getChildren() {
-
 		$folder_content = OC_Files::getDirectoryContent($this->path);
 		$paths = array();
 		foreach($folder_content as $info) {
@@ -124,10 +123,16 @@ class OC_Connector_Sabre_Directory extends OC_Connector_Sabre_Node implements Sa
 		}
 		$properties = array_fill_keys($paths, array());
 		if(count($paths)>0) {
-			$placeholders = join(',', array_fill(0, count($paths), '?'));
+			//
+			// the number of arguments within IN conditions are limited in most databases
+			// we chunk $paths into arrays of 200 items each to meet this criteria
+			//
+			$chunks = array_chunk($paths, 200, false);
+			foreach ($chunks as $pack) {
+				$placeholders = join(',', array_fill(0, count($pack), '?'));
 				$query = OC_DB::prepare( 'SELECT * FROM `*PREFIX*properties` WHERE `userid` = ?' . ' AND `propertypath` IN ('.$placeholders.')' );
-			array_unshift($paths, OC_User::getUser()); // prepend userid
-			$result = $query->execute( $paths );
+				array_unshift($pack, OC_User::getUser()); // prepend userid
+				$result = $query->execute( $pack );
 				while($row = $result->fetchRow()) {
 					$propertypath = $row['propertypath'];
 					$propertyname = $row['propertyname'];
@@ -135,6 +140,7 @@ class OC_Connector_Sabre_Directory extends OC_Connector_Sabre_Node implements Sa
 					$properties[$propertypath][$propertyname] = $propertyvalue;
 				}
 			}
+		}
 
 		$nodes = array();
 		foreach($folder_content as $info) {