https://books.pharo.org/booklet-Glorp/html/glorp.html
This document describes the Glorp object-relational mapper. By reading it, you will learn how to map your objects to a relational database. It presents step by step how to use Glorp and its basic and advanced concepts in a tutorial. At the end we include an Appendix that revisits relational database concepts. We thank the authors of the previous Glorp tutorials R. Withney and N. Pratt for having granted us the right to use some of their material. This document has been written by E. Maringolo and edited by S. Ducasse.