Returning a Strongly Typed Collection
The difficulty in building good object-oriented systems based on relational databases is the orthogonality between a relational database and an object-oriented structure. Databases are generally made of tables with rows and columns, and relationships are inferred from key columns. The closest analogy between a single object and a database is the row. The problem is that databases tend toward normalization, resulting in many pieces of what might comprise a single object existing in more than one table. The bending and contorting between rows of normalized data to objects, back and forth, is what makes it difficult to build object-oriented systems on top of relational databases.
On the one hand, you have the ...
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