Fixes #1747: Override default sql_mode to overcome strict_trans_table

include/database/PearDatabase.php

@@ -269,6 +269,9 @@ class PearDatabase{
 			$this->database->Execute($setnameSql);
 			$this->logSqlTiming($sql_start_time, microtime(true), $setnameSql);
 		}
+
+		// Ensure sql_mode is friendly
+		$this->database->Execute("SET SESSION sql_mode = 'NO_ENGINE_SUBSTITUTION'");
 	}
 
 	/**