| 摘要 |
A user-friendly query modeling tool for representing creating, modifying and modeling a query language statement for use in retrieving data from a database. In accordance with the present invention, the tool includes a user interface for receiving or building and manipulating a query, a query model definition for use in populating instances of one or more query models, and a model content provider for receiving query elements from the user interface and providing them to the query model, and conversely, for retrieving query elements from the query model and providing them to the user interface. The model content provider has a hierarchical architecture including lower level API specific components for supporting a plurality of GUI API'S, and higher level API-independent, reusable components. This architecture facilitates scalability in terms of adding support for new API's.
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