Added a default _insert_batch() method instead of requiring each driver to define it and fixed 2 issues related to it
diff --git a/system/database/DB_active_rec.php b/system/database/DB_active_rec.php
index b324226..2bb8913 100644
--- a/system/database/DB_active_rec.php
+++ b/system/database/DB_active_rec.php
@@ -1219,6 +1219,23 @@
// --------------------------------------------------------------------
/**
+ * Insert_batch statement
+ *
+ * Generates a platform-specific insert string from the supplied data.
+ *
+ * @param string the table name
+ * @param array the insert keys
+ * @param array the insert values
+ * @return string
+ */
+ protected function _insert_batch($table, $keys, $values)
+ {
+ return 'INSERT INTO '.$this->protect_identifiers($table).' ('.implode(', ', $keys).') VALUES '.implode(', ', $values);
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
* The "set_insert_batch" function. Allows key/value pairs to be set for batch inserts
*
* @param mixed