You have to SubClass the IDbCommand CreateCommand(); method on the IDbProvider.
Once the ISqlMapper is build by DomSqlMapBuilder, replace the IDataSource by a decorate one on which you subclass the CreateCommand() method on the IDbProvider implementation. -- Cheers, Gilles <a href="http://www.amazon.com/gp/registry/6JCP7AORB0LE">Wish List</a>

