DBAdapt

To allow TDataSetAdapter to have an image field but not require that all applications built with TDataSetAdapter use jpeg units, the TDataSetAdapter has an indirect reference to the image field class. DBAdapt.pas contains a variable named DataSetAdapterImageFieldClass that references the class of the image field, which must be derived from TBaseDataSetAdapterImageField.variable. When the DBAdaptImage.pas unit is initialized, DataSetAdapterImageFieldClass is assigned a class reference to TDataSetAdapterImageField.