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Extending DQL with Recursive Facilities

Wiśniewski P., Burzańska M., Krukowski P.

Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica

2016

Vol. 16, no. 1

12--20

Object Relational Mappings reduce a gap between Relational Databases and programming languages. However, only the simplest operations are covered by the ORM frameworks. Most facilities provided by DBMSs are not usable via ORM. Among such features are recursive queries, introduced in SQL:99 standard. This paper presents integration of Recursive Common Table Expressions with Doctrine Query Language - a part of Doctrine ORM framework for PHP.

The Impedance Mismatch in Light of the Unified State Model

Wiśniewski P., Burzańska M., Stencel K.

Fundamenta Informaticae

2012

Vol. 120, nr 3/4

359-374

In this paper we discuss the misunderstanding that have arisen over the years around the broadly defined term of the object-relational impedance mismatch. It occurs in various aspects of database application programming. There are three concerns judged the most important: mismatching data models, mismatching binding times and mismatching object lifecycle. This paper focuses on the data model mismatch. We introduce the common state theory, i.e. a unified model of objects in popular programming languages and databases. The proposed model exploits and emphasizes common properties of all these objects. Using our model we demonstrate that there are notably more similarities than differences. We conclude that the impact of the mismatch of data models can be significantly reduced.