As evident from the examples above, queries are executed with one of the many execute methods defined in the Query interface. If your query declares between 0 and 3 parameters, use the execute version that takes the corresponding number of Object arguments; each argument should be set to a parameter value. For queries with more than 3 parameters, you can use the more generic executeWithArray and executeWithMap methods. See the Query interface Javadoc for details.

All execute methods declare a return type of Object, but they really return Collections. The JDO specification only uses Object rather than Collection to enable vendors to use proprietary return types in certain cases, and to allow for future expansion of the interface.

Query results may hold on to data store resources; therefore, all results should be closed when they are no longer needed. You can close an individual query result with the close method, or all open results at once with the closeAll.