PharoExtras / ROE

ROE is used together with PostgreSQL. Avi Bryant wrote: Inspired somewhat by SchemeQL, I built a library that models the relational algebra. The Relational Object Expressions library, or ROE, doesn’t do any mapping, but it does put the world of tables and rows on an equal footing with objects. Relational expressions (ie, queries) are first class objects, which can be easily passed around, composed, and introsopected. They respond to the Collection protocol, which means that from the outside they look and feel like an ordered collection of Tuple objects, but they’re lazy - composing them and filtering them is free, it’s only once you start iterating over the data that a single SQL query is built and sent out to the database.

The first version is based on av.42 as found on squeakmap.