Intercept SQL statements containing parameter values generated by NHibernate

I use a simple interceptor to intercept the sql string that nhibernate generates for loging purposes and it works fine.

public class SessionManagerSQLInterceptor : EmptyInterceptor, IInterceptor
    {
        NHibernate.SqlCommand.SqlString IInterceptor.OnPrepareStatement(NHibernate.SqlCommand.SqlString sql)
        {
            NHSessionManager.Instance.NHibernateSQL = sql.ToString();
            return sql;
        }
    }

This however captures the sql statement without the parameter values.. They are replaced by '?'

Eg: .... WHERE USER0_.USERNAME = ?

The only alternative approach i found so far is using log4nets nhibernate.sql appender which logs sql statement including parameter values but that is not serving me well..

I need to use an interceptor so that for eg. when i catch an exception i want to log the specific sql statement that caused the persistence problem including the values it contained and log it mail it etc. This speeds up debuging great deal compared to going into log files looking for the query that caused the problem..

How can i get full sql statements including parameter values that nhibernate generate on runtime?