So I have an issue with conversion of boolean types when dealing with an oracle 11g database. It appears that when a boolean type is mapped to type="true_false" it inserts a uppercase T or F in database instead of a desired lowercase t or f. I have set my query substitions to true='t' and false='f' but records are still getting inserted with these uppercase values. So here is my question: Is there any way to configure hibernate to use lowercase 't' or 'f' when inserting into the DB?