Design   2051065

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What Is Assumed When Deferring Database Decisions? | 8th Light
Really good post about designing the interface between your application and data store.

One benefit of creating an access layer instead of accessing data through an ORM is that there is not a temptation to throw database access around haphazardly throughout the codebase. Data access patterns are driven by use cases instead of driven by what the ORM is able to do, thereby promoting a clean separation of concerns and a loose coupling of the business logic and persistence layer.

In my mind, this is a good thing. We want clean separations of concerns. Having a loosely coupled and pluggable architecture allows for easy testing and rapid development in the long term. However, there seems to be an assumption, when treating the database as a detail, that the only concern of the data layer is mapping the application's data from the shape the application knows about to the shape the database expects. This is what ORMs have traditionally done. This is what it means to treat the database as a detail, we can plug in a mapping layer that ultimately talks to whatever storage we want.

This is where adherence to this philosophy falls down, because databases are more than just a final resting point for a certain shape of data. Databases have access patterns, and those access patterns affect their usage by their collaborators.
programming  database  design  patterns  architecture  8thLight 
59 minutes ago by jefframnani

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