Method for implementing one-to-many binary relations in object-oriented systems using doubly-linked rings
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United States of America Patent
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May 2, 1995
Grant Date -
N/A
app pub date -
Aug 31, 1992
filing date -
Aug 31, 1992
priority date (Note) -
Expired
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Abstract
An implementation of one-to-many binary relations in an object-oriented database management system and object-oriented data model. The implementation includes storing all the information for the relationships of a relation contiguously inside the related instances, such as a source instance and a sink instance. The information stored within the related instances is used to create a doubly-linked ring of instances. The doubly-linked ring of instances is used in implementing a relation. In order to iterate through a relation, a cursor is employed. Encapsulated within the cursor are various pointers and data members which are used in cursing through the relation. The cursor is type safe and each cursor instance is maintained in a cursor dictionary, providing iteration safety. In addition, the cursor is operational in a forward direction and a backward direction, and the direction of the cursor can be dynamically switched.
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