The O2 Database Programming Language

In this paper, we describe the 02 database programming language as it is currently implemented. We first show how 02 provides the user with both obThe next choice concerned the programming lanjects and complex values. Then, we present the guage of the system. Among the possible solutions persistence management of 02. We describe how (extending an e.xisting language, designing a new objects are encapsulated and manipulated through language, or being language independent), we have chosen the last one mainly for marketing reasons methods and how V&KS are directly accessible through (from a purely technical point of view the second operators. We also present the subtyping and inheritance relationships in 02 together with the typewas probably the best). The system is viewed by checking mechanism. Finally, we mention some inthe user as consisting of a data definition language teresting features which deal with exceptions and we (DDL) by which the user can manipulate a hierarmake a comparison between 02 and several other thy of classes. He/she can attach methods to classes object-oriented database systems. or to objects by writing these methods in various languages. Our first target set of languages consists of C and Basic. Rather than speaking of the