+ /**
+ * Get the Revision object of the oldest revision
+ * @return Revision|null
+ */
+ public function getOldestRevision() {
+ wfProfileIn( __METHOD__ );
+
+ // Try using the slave database first, then try the master
+ $continue = 2;
+ $db = wfGetDB( DB_SLAVE );
+ $revSelectFields = Revision::selectFields();
+
+ while ( $continue ) {
+ $row = $db->selectRow(
+ array( 'page', 'revision' ),
+ $revSelectFields,
+ array(
+ 'page_namespace' => $this->mTitle->getNamespace(),
+ 'page_title' => $this->mTitle->getDBkey(),
+ 'rev_page = page_id'
+ ),
+ __METHOD__,
+ array(
+ 'ORDER BY' => 'rev_timestamp ASC'
+ )
+ );
+
+ if ( $row ) {
+ $continue = 0;
+ } else {
+ $db = wfGetDB( DB_MASTER );
+ $continue--;
+ }
+ }
+
+ wfProfileOut( __METHOD__ );
+ if ( $row ) {
+ return Revision::newFromRow( $row );
+ } else {
+ return null;
+ }
+ }
+