Package org.eclipse.persistence.queries
Interface QueryRedirector
- All Superinterfaces:
Serializable
- All Known Implementing Classes:
MethodBaseQueryRedirector
Purpose: Query redirection allows for a named or parameterized query (or finder) to dynamically determine how the query is to be executed based on the arguments.
Description: An implementor of this interface can be given to a query to allow the user to have full control over the execution of the query. Redirection can be used to:
- Dynamically configure the query options based on the arguments (i.e. ordering, query optimization... etc.).
- Dynamically define the selection criteria based on the arguments.
- Pass Query By Example objects or Expressions as the arguments.
- Post process the query results.
- Perform multiple queries or non-EclipseLink operations.
Note: If you execute the query on a UnitOfWork, the results register with that
UnitOfWork, so any objects you attempt to retrieve with the invoke
method must come from the Session Cache.
- See Also:
- Author:
- James Sutherland
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Method Summary
Modifier and TypeMethodDescriptioninvokeQuery
(DatabaseQuery query, Record arguments, Session session) REQUIRED: Perform the query.
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Method Details
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invokeQuery
REQUIRED: Perform the query. This must execute the query base on the arguments and return a valid result for the query.
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