Take a look at SQL Workbench. It has a "Data Pumper"-feature, where you can transfer all data from one DB to another. If you have access to both your DBs, that would possibly the best solution.
To quote the website:
SQL Workbench/J is a free,
DBMS-independent, cross-platform SQL
query tool. It is written in Java and
thus it should run on any operating
system that provides a Java Runtime
So, no problem running it on OS X.