Query Service
This service provides a general object query mechanism for distributed objects. With this service, collections of objects can be searched to generate subcollections, or subsets of objects within a collection can be deleted or updated through a query. The facilities defined in the query service can be mapped to, but aren’t limited to, persistent storage facilities, such as relational or object databases.
Collections of objects are represented by
Collection objects, which are created using a
CollectionFactory. Iterate through a
Collection of objects using an
Iterator. QueryEvaluator
objects are used to issue a Query against a
given Collection. The result of evaluating a
Query can be any type, but typically it is a
Collection of some kind. A
QueryManager is a type of
QueryEvaluator that allows you to create
queries.
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