Transaction and error handling

[eluser]ekstro[/eluser]
InsiteFX - really thanks for your answer, but my problem is quite different. I want to handle MYSQL errors with custom model extension - more precisely: I have custom table with log where when error occurs it insert info about mysql error (and other info, about post req etc.). I don't know why CI didn't collect info that normaly is available in $this->db->_error_number and $this->db->_error_message - and give as access to it exactly like the info about the performance of such queries (in array) (in $this->db we have access to all transaction queries, execution time etc - but why we haven't mysql errors...)