I assume you're basically talking about this part:

... AND (Bug.ixBug = $args)");
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You need to make the query fetching multiple id's, right? In this case, use the IN syntax of SQL, like so:

... AND (Bug.ixBug IN (23, 45, 3564)");
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Note that this is completely unrelated to using fetchrow_* or fetchall_*. I'm not sure, what your problem with them (the functions) is. fetchrow fetches one row, so you need to loop over the table. fetchall fetches all rows in one go.