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• Hibernate OneToOne - how to set null value?

  - by EugeneP

  If I want to save a linked instance as null in a database, what should I do? I cannot simply pass null to obj.setOneToOneAssociatedObject(null) Still, I want to save this link as null (table allows it).

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• hibernate proxy ..

  - by abc

  load() just returns a proxy by default and database won’t be hit until the proxy is first invoked. what does it mean by proxy exactly here ?

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• Hibernate many-to-many relationship

  - by Capitan

  I have two mapped types, related many-to-many. @Entity @Table(name = "students") public class Student{ ... @ManyToMany(fetch = FetchType.EAGER) @JoinTable( name = "students2courses", joinColumns = { @JoinColumn( name = "student_id", referencedColumnName = "_id") }, inverseJoinColumns = { @JoinColumn( name =…

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• How to make NOT IN statement via Restrictions

  - by slavig

  I used this trick: List statuses = new ArrayList(); Criteria criteria = session.createCriteria(MessageQueue.class); criteria.add(Restrictions.not(Restrictions.in("message_status", statuses))); and this code creates: ...from MESSAGE_QUEUE mq where not (mq.message_status in (?, ?, ?, ?))... but I need: ...from MESSAGE_QUEUE mq where…

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• Confused about distinct/aggregate queries with (N)Hibernate

  - by nw

  I'm not sure how to approach queries that don't map 1:1 to my persistent entities - in other words, distinct and aggregate queries. For example, I need to retrieve a distinct list of property values for populating a drop-down list. Should I write a class and a mapping for the "entities" that are returned by this query? Or should I just…

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• OneToMany association updates instead of insert

  - by Shvalb

  I have an entity with one-to-many association to child entity. The child entity has 2 columns as PK and one of the column is FK to the parent table. mapping looks like this: @OneToMany(cascade = {CascadeType.ALL}, fetch = FetchType.EAGER ) @JoinColumn(name="USER_RESULT_SEQUENCES.USER_RESULT_ID",…

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• hibernate cache [closed]

  - by paku

  kljklkjlkjlkl kjkljlkjlk jlkj lkjlkjlk

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• hibernate validationQuery.. proper way to use it

  - by cometta

  sometime the connection from application to database will drop and i get SQLState: 08006 error Code: 17002. Below is my configuration for database pooling <prop key="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</prop> <prop…

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• Technology Selection for a dynamic product

  - by Kuntal Shah

  We are building a product for Procurement Domain in JAVA. Following are the main technical requirements. Platform Independent Database Independent Browser Independent In functional requirements the product is very dynamic in nature. The main reason being the…

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• Hibernate: Perform criteria query with Sub-Select AND Left-Outer join?

  - by Markos Fragkakis

  Can I perform a Criteria query with Sub-Select AND Left-Outer join? For example, I have A 1-many B 1-many C. With Criteria.createAlias ("b", "b", Criteria.LEFT_JOIN) I can perform Left Outer join. With Criteria.setFetchMode ("b",…

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• how to update a tabel with composite key using hibernate?

  - by Hari

  Hi, I am newbee to hibernate, if i there is a tabel which has a composite key, how to update the tabel using hibernate.

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• Cascading updates with business key equality: Hibernate best practices?

  - by Traphicone

  I'm new to Hibernate, and while there are literally tons of examples to look at, there seems to be so much flexibility here that it's sometimes very hard to narrow all the options down the best way of doing things. I've been working…

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• Why does Hibernate ignore the JPA2 standardized properties in my persistence.xml?

  - by Ophidian

  I have an extremely simple web application running in Tomcat using Spring 3.0.1, Hibernate 3.5.1, JPA 2, and Derby. I am defining all of my database connectivity in persistence.xml and merely using Spring for dependency injection. …

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• What are the hibernate annotations used to persist a value typed Map with an enumerated type as a ke

  - by Jason Novak

  I am having trouble getting the right hibernate annotations to use on a value typed Map with an enumerated class as a key. Here is a simplified (and extremely contrived) example. public class Thing { public String id; …

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• How generate the SQL queries that match the JPA Entity CRUD operations at build time with Hibernate

  - by aravisski

  Given JPA annotated Entities, is it possible to generate (i.e. before runtime) the list of queries that will be performed by Hibernate for CRUD operations (performed against EntityManager) ? For named queries it is possible…

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• How to use Hibernate SchemaUpdate class with a JPA persistence.xml?

  - by John Rizzo

  I've a main method using SchemaUpdate to display at the console what tables to alter/create and it works fine in my Hibernate project: public static void main(String[] args) throws IOException { //first we prepare the…

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• Does Hibernate support one-to-one associations as pkeys?

  - by Andrzej Doyle

  Hi all, Can anyone tell me whether Hibernate supports associations as the pkey of an entity? I thought that this would be supported but I am having a lot of trouble getting any kind of mapping that represents this to…

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• Getting my webapp to be database agnostic with Hibernate...

  - by JellyHead

  So the ultimate in scope-creep came in the other day: since we're using Hibernate, could we make our webapp run on Oracle as well as MySQL, interchangably? I thought this would be a simple case of changing…

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• How to map oracle timestamp to appropriate java type in hibernate?

  - by jschoen

  I am new to hibernate and I am stumped. In my database I have tables that have a columns of TIMESTAMP(6). I am using Netbeans 6.5.1 and when I generate the hibernate.reveng.xml, hbm.xml files, and pojo…

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• What are the hibernate annotations used to persist a Map with an enumerated type as a key?

  - by Jason Novak

  I am having trouble getting the right hibernate annotations to use on a Map with an enumerated class as a key. Here is a simplified (and extremely contrived) example. public class Thing { public…

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• Is there any advantage for using a library other than Hibernate for JPA?

  - by Jeduan Cornejo

  Hi, I've been using JPA for some time now and been in projects where we've used both Hibernate Annotations and Toplink Essentials. AFAIK the project leader chose Toplink because Netbeans had it…

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• HIbernate 3.5.1 - can I just drop in EHCache 2.0.1?

  - by caerphilly

  I'm using Hibernate 3.5.1, which comes with EHCache 1.5 bundled. If I want to use the latest EHCache release (2.0.1), is it just a matter of removing the ehcache-1.5.jar from my project, and…

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• How are managed the sequences by JPA and Hibernate?

  - by romaintaz

  Hi all, I am using Hibernate in my project, and many of my entities use a sequence for their technical keys. For example: @Entity @Table(name = "T_MYENTITY") @SequenceGenerator(name =…

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• How do I delete orphan entities using hibernate and JPA on a many-to-many relationship?

  - by user368453

  I want to delete orphan entities using hibernate and JPA on a many-to-many relationship but all that I found was this atibute the attribute.…

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• spring security : Failed to load ApplicationContext with pre-post-annotations="enabled"

  - by thogau

  I am using spring 3.0.1 + spring-security 3.0.2 and I am trying to use features like @PreAuthorize and @PostFilter annotations. When…

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