added removal of non-printing characters to escape_str() of drivers that do not have native PHP escaping mechanisms
diff --git a/system/database/drivers/odbc/odbc_driver.php b/system/database/drivers/odbc/odbc_driver.php
index 6471716..f89000d 100644
--- a/system/database/drivers/odbc/odbc_driver.php
+++ b/system/database/drivers/odbc/odbc_driver.php
@@ -235,7 +235,7 @@
 	function escape_str($str)	

 	{

 		// ODBC doesn't require escaping

-		return $str;

+		return $this->input->_remove_invisible_characters($str);

 	}

 	

 	// --------------------------------------------------------------------