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If my application works on SDAC and I want to support MYSQL I need to move to UNIDAC.

How much work is it involved to make my application work with UNIDAC wihtout adding support to other dbs, I mean just for using UNIDAC as SDAC? (of course as a preliminary step, before introducing support to more DBs)

At first you can use Migration Wizard to replace SDAC components with UniDAC components on your forms. Some properties of SDAC components are not available in the corresponding UniDAC components but you can find most of these properties in SpecificOptions. So after replacing components you need to set SpecifcOptions like they were in your old project.

UniDAC components have the same program interface as SDAC. But some methods or properties may be unavailable. So you need to change some places in your code where the compiler will give errors. Use analogous methods of UniDAC.