O/R mapping tools are becoming more popular each day and people are realizing the productivity gain they provide to developers. Yet, many people don’t know enough about O/R mapping to consider using these tools and many others are weary of using any code generators (including O/R mapping tools). In this article, I will try to educate you about the various important features that a good O/R mapping tool would provide you and how it can be beneficial to you. I am not discussing any particular O/R mapping tool but rather all tools in general.