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Abstract

Techniques for simplifying the aggregation of data stored in a number of objects in a database system. A user-defined type and an object view are associated with a kind of data to be aggregated. The object view specifies the locations of the data in the objects and maps the data to be aggregated into the user-defined type. An application program interface includes a fetch interface that causes the database system to make a query over the object view associated with the kind of data and return the aggregated data in a set of objects of the user-defined type. The returned data is converted to XML and may be further transformed using XSL stylesheets. The application program interface further includes a filter interface that specifies a restriction for the query, a count interface that specifies the number of objects to be returned at once by the application program interface, a transform interface that specifies an XSL style sheet, and a transform parameter interface for providing parameters to the XSL style sheet. The techniques may be used to aggregate metadata for various classes of objects from a data dictionary in a database system. In this application, each class of object has a name and a user-defined type and object view are associated with the class name. The fetch interface specifies a class name and the user-defined type and object view associated with the name are used to aggregate the metadata. One of the transforms performed in this application is the transformation of the metadata for an object into creation DDL for the object.

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