Hi Linda,
what is the precise use case we want to address with this feature ?
Do we want to just enable later reuse of a query, which could already
be done right now by retaining the Query object after execution, and
which could be made more easy by adding a reset method to the Query
interface that cleans up all parameter bindings and/or a clone method
that creates a copy of the query without the parameter bindings ?
Or do we head for inter-thread communication as indicated by Evan ?
Best regards
Rainer
Linda DeMichiel, am 12 Apr 2011 hast Du um 11:43 zum Thema "[jsr338-experts] named queries" geschrieben :
> We've received suggestions to the effect that it would be useful if
> queries could be created dynamically (e.g., at initialization time)
> and then be assigned names so that they could be used for execution
> later.
>
> These queries would have the same scope as other named queries,
> and be associated with the persistence unit.
>
> For example:
>
> TypedQuery<Integer> tq = em.createQuery("SELECT e.seniority FROM Employee e WHERE e.seniority > 10", Integer.class);
> emf.addNamedQuery("Employee_Seniority", tq);
>
> Any configuration of the query object (except for actual parameter
> binding) specified when the query was added as a named query would be
> retained as part of the named query. [I.e., this would include
> configuration information like setMaxResults, setHint, setFlushMode,
> setLockMode, result set mapping information, and information
> registered about stored procedure parameters...]
>
> When the query is executed, information that is settable by means
> of the Query API can be overridden. Information that is overridden
> does not affect the named query as registered with the EMF, and
> thus does not affect subsequent Query objects created by means
> of the name via the EntityManager createNamedQuery method.
>
>
> Linda
>
---
Rainer Schweigkoffer SAP AG Walldorf
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Technology Development Dietmar-Hopp-Allee 16
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