The JDO Query Language interface (JDOQL) has the following goals:
Query language neutrality. The underlying query language might be a relational
query language such as SQL; an object database query language such as OQL; or
a specialized API to a hierarchical database or mainframe EIS system.
Optimization to specific query language. The Query interface is capable of
optimizations; therefore, the interface has enough user-specified information to allow for the JDO implementation to exploit data source specific
query features.
Accommodation of multi-tier architectures. Queries may be executed entirely in
memory, or may be delegated to a back end query engine. The JDO Query interface
provides for both types of query execution strategies.
Large result set support. Queries might return massive numbers of JDO instances
that match the query. The JDO Query architecture provides for processing the
results within the resource constraints of the execution environment.
Compiled query support. Parsing queries may be resource-intensive, and in many
applications can be done during application development or deployment, prior to
execution time. The query interface allows for compiling queries and binding run-time
parameters to the bound queries for execution.
Additional
information on JDOQL, including a BNF grammar, can be found at the Sun
web site (new window).
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Additional
information on JDOQL, including a BNF grammar, can be found at the 
based on 2 reviews.
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