In the design and development of database applications out major concern is standards compliance, performance, and optimum TCO.
During the years we have learned that nearly all of the advantages of proprietary database languages are countervailed by their lack of flexibility and the high costs of system changes or even updates.
We are using standards interfaces like ODBC (if we have to implement for MS Windows) as well as JDBC.
By utilizing modern frameworks our applications provide you with a maximum of flexibility.
Although we are not tied to a single product, PostgreSQL, an Open Source object relational database is our long time favourite.