problem saving and retrieving an AUTO_INCREMENT value using MySQL variable and LAST_INSERT_ID()

Hi,

This is more of a mySQL question but I hope someone can help me out.

I'm trying to save the most recent AUTO_INCREMENT value from a parent table
to use, later, in multiple records of a child table that also has an
AUTO_INCREMENT field. My relevant code:

// In the parent class
queryParent << "SET @sim_id = LAST_INSERT_ID()";
queryParent.execute();  

// In the child class get the value of the last auto_inc field from the
parent and insert into child

queryChild << "INSERT INTO child (simid) values (@simid)";
queryChild.execute();

Yet looking at the child table each record has a NULL value for simid, where
I would expect the value from the parent table to be. So either I'm not
setting or retrieving the MySQL variable properly. Any ideas? 

Thanks in advance!


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