The development of database application systems will benefit from high reusability because similar design circumstances recur frequently in database developments. However, research has shown that mismatches between pre-qualified components with the application architecture, state and other components have been a major factor hindering the component reusability. In this paper, scenario based dynamic component adaptation and generation (SAGA) is proposed in a generative and component based reuse framework to tackle the high variability and mismatch problem through deep component adaptation and component generation. XML has been used as the universal information carrier in the approach.