ACM SIGMOD Anthology VLDB dblp.uni-trier.de

Design and Implementation of an Extensible Database Management System Supporting User Defined Data Types and Functions.

Volker Linnemann, Klaus Küspert, Peter Dadam, Peter Pistor, R. Erbe, Alfons Kemper, Norbert Südkamp, Georg Walch, Mechtild Wallrath: Design and Implementation of an Extensible Database Management System Supporting User Defined Data Types and Functions. VLDB 1988: 294-305
@inproceedings{DBLP:conf/vldb/LinnemannKDPEKSWW88,
  author    = {Volker Linnemann and
               Klaus K{\"u}spert and
               Peter Dadam and
               Peter Pistor and
               R. Erbe and
               Alfons Kemper and
               Norbert S{\"u}dkamp and
               Georg Walch and
               Mechtild Wallrath},
  editor    = {Fran\c{c}ois Bancilhon and
               David J. DeWitt},
  title     = {Design and Implementation of an Extensible Database Management
               System Supporting User Defined Data Types and Functions},
  booktitle = {Fourteenth International Conference on Very Large Data Bases,
               August 29 - September 1, 1988, Los Angeles, California, USA,
               Proceedings},
  publisher = {Morgan Kaufmann},
  year      = {1988},
  isbn      = {0-934613-75-3},
  pages     = {294-305},
  ee        = {db/conf/vldb/LinnemannKDPEKSWW88.html},
  crossref  = {DBLP:conf/vldb/88},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

Abstract

Current query languages for relational databases usually are fixed, i.e. they provide only a fixed set of data types and operations. It is usually not possible to extend this set by user defined data types or functions. This is a major drawback especially in advanced applications like engineering applications or office automation. In these areas special data types and special functions are needed quite frequently, e.g. a data type for matrices and a function for matrix multiplication. Since matrices and matrix multiplication are not provided in conventional query languages, the user has to model matrices by low level constructs as, for example, byte strings, and to write a rather cumbersome application program in a conventional programming language for interpreting these byte strings as matrices and for multiplying them. Another example of a missing function is even as simple as the square root function. Therefore, a mechanism is needed that allows the user to define his own data types and functions and add them somehow to the DBMS such that they can be used within the query language in the same way as a normal built-in function on basic data types. This paper describes an extension mechanism for data types and functions that has been implemented at the IBM Scientific Center in Heidelberg. The mechanism is based upon HDBL, an SQL based query language for complex objects. The functions themselves are written in a conventional programming language, in our case PASCAL, thus allowing to formulate general algorithms. One important aspect is the interface between the data types of the DBMS on the one side and the data types of the programming language on the other side. In our case, this mapping is more complicated than in other approaches because our type system supports complex objects directly and not via long strings as other authors do. Moreover, we use the PASCAL type system to a large extend in order to allow type checking at compile time.

Copyright © 1988 by the VLDB Endowment. Permission to copy without fee all or part of this material is granted provided that the copies are not made or distributed for direct commercial advantage, the VLDB copyright notice and the title of the publication and its date appear, and notice is given that copying is by the permission of the Very Large Data Base Endowment. To copy otherwise, or to republish, requires a fee and/or special permission from the Endowment.


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François Bancilhon, David J. DeWitt (Eds.): Fourteenth International Conference on Very Large Data Bases, August 29 - September 1, 1988, Los Angeles, California, USA, Proceedings. Morgan Kaufmann 1988, ISBN 0-934613-75-3
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