Query engine and method for querying data using metadata model
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United States of America Patent
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Aug 19, 2003
Grant Date -
N/A
app pub date -
Sep 1, 2000
filing date -
Sep 3, 1999
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Abstract
A query engine formulates a data source query to obtain data from one or more data sources. The query engine uses a metadata model containing model objects that represent the data sources. The metadata model has a data access layer, business layer and package layer. The model objects of the business layer are constructed based on the model objects contained in the data access layer. The query engine interacts to the metadata model at the business layer, and formulates a data source query based on a query specification provided by a client application. Thus, the query engine allows use of different type of client applications to obtain reports from one or more data sources.
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