About embedded

manual

Storing JPA Entity Objects

Explains how to use JPA to store (persist) entity objects in the database.... Explicit Persist Referenced Embedded Objects Referenced Entity Objects ... other persistable types can only be stored in the database embedded in containing entities (as field values). A ... See JavaDoc Reference Page... . Referenced Embedded Objects The following code stores an Employee instance ...

 
api-jpa

JPA Annotations for Fields

Reference (JavaDoc) of JPA 2 field annotations, including @Basic, @Embedded, @EmbeddedId, @Version, @Transient, @Enumerated, @MapKeyEnumerated, @Temporal and @MapKeyTemporal.... javax.persistence.Basic javax.persistence.Embedded javax.persistence.ElementCollection ...

 
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Embedded Object inside another embedded object - is that possible?

I have an entity with an embedded object - it works fine. Now I am trying to add an embedded object inside the first level embedded object - but it does not seem to store it and does not throw either... I was wondering if it was a limitation or not? has anyone tried this before? Thanks ... I have an entity with an embedded object - it works fine. Now I am trying to add an embedded object inside the first level embedded object - but it does not seem ...

 
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Embedding Managed Entities in Embedded Objects = bad idea

Discovered that you can't embed entities in embeddable objects if the entity is managed. Haven't tried embedding un-managed entities in embeddable objects, though I imagine that's not a great idea. The the error message isn't all that obvious (attempting to persist object which already has an id).     #1 2012-06-01 07:35 Discovered that you can't embed entities in embeddable objects if the entity is managed. Haven't ...

 
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collection of embedded objects

1. In general, are there any restrictions of the use of @Embedded objects in collections, compared to @Entity? 2. If you have a large nested collection of @Embedded objects, and you remove the parent @Entity, does the remove cascade through the whole collection? 3. Is searching through collections of @Embedded objects more expensive (time) than searching through collections of @Entity? ... 1. In general, are there any restrictions of the use of @Embedded objects in collections, compared to @Entity ? 2. If you have a large nested collection of @Embedded objects, and you remove the parent @Entity , does the remove ...

 
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Embedded in JDO metadata not working in objectDB 2.x ?

Hi, I am using JDO access to the database with the persistence defined in package.jdo XML metadata files. In those metadata files I have few persistence-capable classes which had extents in ObjectDB 1 (with an OID for every instance) and all other classes were embedded (so without extent and own OID) in those few peristence-capable ones. Example of JDO metadata: ... an OID for every instance) and all other classes were embedded (so without extent and own OID) in those few peristence-capable ones. ... > <field name = "rackGroupList" embedded = "true" /> </class >   <class ...

 
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Weird behaviour with enhanced classes and embedded entities

Hi, I've found some weird behaviour in my project (www.tinymediamanager.org): Sometimes some entries of my ArrayLists with embedded entities are missing. I've hunted the problem down to an enhanced/proxied list in my entity which contains embedded entities and some .add(obj) are simply failing. Here is a small sscce which reproduces the issue: ... Sometimes some entries of my ArrayLists with embedded entities are missing. I've hunted the problem down to an enhanced/proxied list in my entity which contains embedded entities and some .add(obj) are simply failing. Here is a ... void addEmbeddedEntity ( MyEmbeddedEntity embedded ) { embeddedEntities. add ( embedded ...

 
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Server vs embedded mode in multi-instance scenario

We are creating a web app that will have multiple different clients, each on their own EC2 instance(s). The clients do not need to share any data, so each could have its own ObjectDB. Clients have a user base of about 2,000 to 60,000 users that could possibly be using their application at any given time (100k absolute maximum). We will probably have multiple instances per client for availability concerns as well as auto scale during peak usage, at least for the benefit of our web application if not for objectdb.... there will only be one active instance of the app, use embedded mode inside the web application itself. Then if we ever have to boot ... say otherwise, with such a big performance improvement for embedded mode, but maybe that has a limit. Is there a guideline as to system ...

 
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Changing existing objects from Entity to Embedded

Hi, I realised that I have a mistake (from application logic point of view) in one of my JDO metadata files: ... > <field name = "attributes" embedded = "true" > <map embedded-key = "true" embedded-value = "true" /> </field > </class ...

 
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Embedded Database Replication

As we all know, embedded databases out perform server databases on every occasion. The problem with embedded databases is that theyre difficult to scale. If I were to create an entire enterprise web application within a single jar file using embedded tomcat and embedded objectdb I would run into problems trying to cluster the data. Is there a way to cluster embedded objectdb? Perhaps some kind of external replicator application that can be used by server administrators to ensure replication is optimal and healthy?... As we all know, embedded databases out perform server databases on every occasion. The problem with embedded databases is that theyre difficult to scale. If I were to create an ...