At least some words on searching data in the OO-way. You didn't need to write sql-queries by hand, instead you use qualifiers.

There are many qualifier available that can be combined with logical qualifiers. All the translation between propertynames and columnames, inserting tablenames, do encoding is done behind the scene.

Of course you can use KVC with qualifier so a DDOExactStringQualifier( “addresses.city”, “Hamburg”) is possible.