We describe CodeQuest, a system for querying source code. It combines two previous proposals, namely the use of logic programming and database systems. Experiments (on projects ranging from 3KSLOC to 1300KSLOC) confirm that for this application, a query language based on Datalog strikes the right balance between expressiveness and scalability.

 @inproceedings{oopsla05codequest, 
    author = "Elnar Hajiyev and Mathieu Verbaere and Oege de Moor and Kris de Volder", 
    title = "{\em CodeQuest}: Querying Source Code with DataLog", 
    booktitle = "Object-Oriented Programming Languages and Systems {(OOPSLA)} Companion",
    year = "2005", 
    publisher = "ACM Press"
  }