The Epsilon Solution to the OCL2PSQL Case.

There have been several attempts to map Object Constraint Language queries to SQL: one of these is the OCL2PSQL mapping proposed by Nguyen and Clavel. In this paper, I describe an implementation of OCL2PSQL using two languages from the Eclipse Epsilon project: 744 lines of ETL code for the model-to-model transformation itself, and 97 lines of EGL code for a model-to-text transformation that produces more readable SQL than the reference version. The solution passes all correctness tests set out in the original framework: the transformation has a median time of 0.93s across all scenarios.