Explicitly added driver name variable in each DB driver, based on this bug report: #4436
diff --git a/system/database/drivers/odbc/odbc_driver.php b/system/database/drivers/odbc/odbc_driver.php
index 2992880..cc8d334 100644
--- a/system/database/drivers/odbc/odbc_driver.php
+++ b/system/database/drivers/odbc/odbc_driver.php
@@ -30,6 +30,8 @@
*/
class CI_DB_odbc_driver extends CI_DB {
+ var $dbdriver = 'odbc';
+
/**
* The syntax to count rows is slightly different across different
* database engines, so this string appears in each driver and is