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Persistance JDO - How to query a property of a collection with JDOQL?


By : Jason Horne
Date : October 17 2020, 11:12 AM
help you fix your problem The AppAccount class has a users variable that is a List. The List does not have a username property directly.
You need to do something like this:
code :


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Query by datetime in JDOQL / Java / GAE


By : user1852863
Date : March 29 2020, 07:55 AM
will be helpful for those in need According to google datastore low-level API, Date Objects seems to be freely storable in GAE. As a consequence, using java.util.Date (or javax.sql.Date, it's not totally explicit) will do the job, i think.

Declarative JDOQL vs Single-String JDOQL : performance


By : echojeff
Date : March 29 2020, 07:55 AM
this one helps. No performance difference at all. The only thing that happens is that the single-string form is parsed into the components. Use which you find most convenient. Alternatively use QueryDSL's JDOQL. JDO3.x has slated the provision of a type-safe refactorable query API, but something that is usable (unlike JPA2 Criteria) akin to QueryDSL

How to achieve SQL IN query in JDOQL?


By : Boopathi
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Yes. Bear in mind that 'in' queries translate to multiple underlying datastore queries, and so aren't particularly efficient - if you can avoid them, do.

How can I use DataNucleus JDOQL API to Query Object within Collection?


By : user3444189
Date : March 29 2020, 07:55 AM
it fixes the issue I've figured out the solution. I may have missed this in the documentation, but I wasn't aware that declared variables actually perform a "cross join" in SQL. This is a really important aspect to the solving the problem.
The query is as follows:
code :
    Query query = pm.newQuery(User.class, "userAttributeCollection.contains(att) & att.value == :val & definition.attributeName == :name");
    query.declareVariables("ObjectAttribute att; ObjectAttributeDefinition definition");
    query.declareImports("import com.us.orm.general.models.ObjectAttributeDefinition; import com.us.orm.general.models.ObjectAttribute");

    query.setResultClass(User.class);

    rval =  (List<User>) query.execute(myAtt.getValue(), name.toString());

How to retrieve a list of objects which are a property of a class with JDOQL?


By : egraham
Date : October 17 2020, 11:12 AM
hope this fix your issue Why use getSimpleName() since that just puts the class name? JDOQL requires the class name, including package as per the JDO spec (getName() is better). Also you do NOT need @Persistent on String fields no matter what Google tells you :-P Saludos
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