MyIsam engine transaction support

Solution 1:

MyISAM effectively works in auto-commit mode (as it's not a transactional engine), and it just ignores the commit/rollback.

Actually storage engine is a different layer in the MySQL architecture, separated from the SQL parser, the SQL layer communicates to the storage engine with lower-level API, and that's the reason there is a common SQL and engines, supporting different subset of featured. You can see very high-level overview of the architecture here

Solution 2:

MyIsam tabels were not built for this. Not even in the 5+ versions. It only was meant to store data. It gives you no guarantee for transactions or data recovery. You should use InnoDB for this and, if needed, use MyIsam for replication purposes (it's faster to retrieve data with MyIsam tables since there's no cross-table checks).

You may read this post from MySQL http://forums.mysql.com/read.php?21,68686,69229#msg-69229