Questions Tagged With dataclass

Eager Loading

Stelt0 — Wed, 21 Dec 2016 09:19:58 -0500

Hello Ivy Team,

In my project, I had to switch from the default Eager loading to the Lazy loading of the Entity classes. The reason was that the queries were not optimized. Now I have the following problem, every time I try to inspect the variables in debug mode, the Designer is throwing errors and it is almost impossible for debugging:

Best Regards, Yordan Yunchov

Enums in Entity Classes

Stelt0 — Mon, 18 Jul 2016 08:58:08 -0400

Hi All,

What is the best practice in ivy to manage Enums in persistence classes ?

this example looks fine to me http://www.codejava.net/frameworks/hibernate/hibernate-enum-type-mapping-example

but how do I implemented in in ivy ? how to add @Enumerated to a field ?

Best Regards, Yordan Yunchov

Entity Class Migrations

Stelt0 — Wed, 06 Jul 2016 10:08:37 -0400

Hello Guys,

I`m new to Hibernate and JPA. I have an Axon.Ivy project that has couple of Entity Classes. I want to move them in a separate project and separate namespace(package) and also to add some additional fields.

What are the implications when I`m changing the data model and the namespaces ? How do I migrate the changes to the production server ?

In .Net Entity Framework there is a concept of 'migrations' where the changes to the database are applied automatically when the code is deploys.

Best Regards, Yordan Yunchov

Avoid MultipleBagFetchException when referencing multiple collections of another type

joha0123 — Fri, 22 Apr 2016 22:04:56 -0400

I know how to store a single list in a JPA class. but now everytime i try to add another list to any other entity class i get an ivy:error:persistence, with following error message:

IvyScriptRuntimeException: IvyScript Runtime Exception in
    Instruction:
        ivy.persistence.axsosUnit.findAll(teamprojekt.Job.class)
    Block:
        teamprojekt.showDashboard.showDashboardData out;
        out = in;
        in.data.closedJobs = ivy.persistence.axsosUnit.findAll(teamprojekt.Job.class);

IvyScriptMethodInvocationException: Error calling method findAll(java.lang.Class) on an object of class ch.ivyteam.ivy.process.data.persistence.internal.IvyEntityManager.

PersistenceUnitException: Failed to excecute operation "findAll" for persistence unit "axsosUnit".

PersistenceUnitException: Could not create EntityManagerFactory of persistence unit'axsosUnit'

PersistenceException: [PersistenceUnit: axsosUnit] Unable to build EntityManagerFactory

MultipleBagFetchException: cannot simultaneously fetch multiple bags

I have read, that you cant use two lists in the same entity class, but i use them in different entity classes. maybe because they are nested?

the structure is: institutionList is inside education which is inside application which has the other list.

I have also read, the solution is to use a set instead of a list. can you explain how to do this? I've tried to change the list to a set from the entity class wizzard, but without success.

can you show me how to do this?

thank you very much

How can I add a List to a database

joha0123 — Wed, 20 Apr 2016 16:25:00 -0400

I am filling a List and then I try to write it to the database. We have two Entity Classes: Application and Education. The relationship is 1:N. (One application can have many educations)

In the Application entity class I have created a List of Education with the relationship ONE_TO_MANY. Mapped by attribute is appl. In the Education entity class i have created a field appl with the relationship MANY_TO_ONE.

The Problem is, that i have to initialize all objects before i can write data into them. this is impossible to do, because the application Object has a Education object in it and the Education Object has a Application object in it.

Is there an other way to save my data to a database?

thanks.

Link case to data

potea — Sat, 09 Apr 2016 21:07:58 -0400

Hi,

is it acutally possible to retrive the data of a specific case, to basically show a list of cases with the corresponding dataclasses? Or is there a better way to show a user the state of cases and the data stored within them.

So far i tried to solve this via IvyScript and query for the specificy Cases I want to show but I can't find a way to link a case to its input data.

Use a PrimeFaces with a ivy-date as datatype

NickSinger — Thu, 10 Jul 2014 13:42:10 -0400

Hello everyone,

how is it possible to use the primefaces <p:calendar>-element with a "date"-object (ch.ivyteam.ivy.scripting.objects.Date) as destination to save the entered date? In the example on THIS page (see section "Converters") they used

<f:convertDateTime pattern="dd.MM.yyyy" />

this solution worked well on my local Xpert.ivy Designer, but does not on our testserver - it just crashed with an error, that it can't convert a java.util.Date-object into a ch.ivyteam.ivy.scripting.objects.Date-object which is a obviously message, that the "converteDateTime" does not work.

In THIS video, someone showed that it is definitively possible to save the value of an calendar-component into a ivy-date. Unfortunately i have no possibility to take a look on the automatic generatred code of the Designer.

Looking forward for your answers,
Nick

Use java properties in Ivy?

Bruno Bütler — Thu, 27 Jun 2013 09:02:56 -0400

I want to use properties of a Java class in Ivy. I know that I should use getter and setter methods, but it does not work when I try to call getabc() or setabc(). What is wrong?

Change data class of a process

Michael Hauck — Thu, 24 Jul 2008 02:48:33 -0400

How can I change the data class of a process after the process is already created?