Re: [Hibernate] Limitations HQL vs. Criteria

[Gavin King]

Michael, Criteria queries are definately not a subset of HQL queries!

For one, they are completely extensible with new user-defined Criterion 
types. Secondly, they support operations upon "composite" values, which
are not yet supported in HQL.

I'm not sure that we are really ready to go reimplementing the Criteria
stuff, to be honest...
Michael Gloegl wrote:

Hi,

I am currently working on rebuilding the Criteria API to generate 
HQL-AST Trees, which can then be passed on to Joshuas HQL-to-SQL tree 
parser. I made some small progresses and can create ASTs from simple 
criteria queries and orders.

However before I get deeper into this, is this possible at all? 
Basically what I do now is to transform the Criteria Query to a HQL 
query, even though allready in its AST state. What would interest me, is 
everything possible in the Criteria API also possible using HQL? 
Otherwise the aproach I take currently will get problematic. I 
especially think of things like .returnMaps() and such. Any opinions on 
this?

Michael



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Gavin King
JBoss Group
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http://hibernate.org> Hi,
I am currently working on rebuilding the Criteria API to generate 
HQL-AST Trees, which can then be passed on to Joshuas HQL-to-SQL tree 
parser. I made some small progresses and can create ASTs from simple 
criteria queries and orders.

However before I get deeper into this, is this possible at all? 
Basically what I do now is to transform the Criteria Query to a HQL 
query, even though allready in its AST state. What would interest me, is 
everything possible in the Criteria API also possible using HQL? 
Otherwise the aproach I take currently will get problematic. I 
especially think of things like .returnMaps() and such. Any opinions on 
this?

Michael



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Gavin King
JBoss Group
+61 410534454
http://hibernate.org


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Re: [Hibernate] Limitations HQL vs. Criteria

[Michael Gloegl]

Hi,

For one, they are completely extensible with new user-defined Criterion 
types. Secondly, they support operations upon "composite" values, which
are not yet supported in HQL.
hm yes, you are most likely right :) I just liked the idea of reusing 
the SQL generation for Criteria queries, but it won't work out probably.

Michael

PS: Sorry for my last mail going over the list 3 times, don't know how 
this happened.

I'm not sure that we are really ready to go reimplementing the Criteria
stuff, to be honest...
Michael Gloegl wrote:

Hi,

I am currently working on rebuilding the Criteria API to generate 
HQL-AST Trees, which can then be passed on to Joshuas HQL-to-SQL tree 
parser. I made some small progresses and can create ASTs from simple 
criteria queries and orders.

However before I get deeper into this, is this possible at all? 
Basically what I do now is to transform the Criteria Query to a HQL 
query, even though allready in its AST state. What would interest me, 
is everything possible in the Criteria API also possible using HQL? 
Otherwise the aproach I take currently will get problematic. I 
especially think of things like .returnMaps() and such. Any opinions 
on this?

Michael




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