Hi everybody,
since we are having a CriteriaBase now, I think this is a good place to
add a
String toJPQL()
method there, which was to provide means to easily trace and/or display
a criteria query. We would have to resolve the issue of unnamed
parameters though. For the purposes mentioned one could perfectly live
with an implementation-defined naming scheme, I'd say. If someone, for
whatsoever reasons, wanted to execute such a query, they should stick
to named parameters then.
For dynamically amending a given named query one would wish an opposite
method on TypedQuery as well. For appropriate typing we would probably
need three of them
CriteriaQuery<T> createCriteriaQuery();
CriteriaDelete<T> createCriteriaDelete();
CriteriaUpdate<T> createCriteriaUpdate();
Here we would have to deal with positional parameters. We may create
parameter objects for them, but we don't support their usage within
criteria queries. We could therfore either consider them an error when
invoking one of those methods, leave the behaviour undefined or provide
a simple naming scheme, since mixed use of named and positional
parameters is not supported. (It might, by the way, be helpful to
readers if that statement from section 4.6.4 was also mentioned
somewhere between 3.8.10 and 3.8.12).
What do you think about this ?
Best regards
Rainer
---
Rainer Schweigkoffer SAP AG Walldorf
Business Solution & Technology TD Core JS&I
Technology Development Dietmar-Hopp-Allee 16
Java Server Core D-69190 Walldorf
JEE Implementation Group phone: +49 6227 7 45305
Building 3, I.3.14 fax: +49 6227 7 821177
rainer.schweigkoffer_at_sap.com
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