This seems like it should be a pretty simple question, or at least have a simple answer. But - I'm really not a database guy, and I'm still pretty far down on the Hibernate learning curve. That said, here's the setup: Consider a unidirectional many-to-many relationship between two entities, from Foo to Bar: (pardon any typos below, th...
Hi @ all, I am concerned with a problem regarding criteria and hql. In first step a complex criteria construction limits a big amount of datasets. In second step a hql calculation should be performed on these preselected datasets of step one. The problem is that the code of both has been developed seperately and i am wondering if it is...
It looks like that Hibernate started using LONG data type in version 3.5.5 (we upgraded from 3.2.7) instead of CLOB for the property of type="text". This is causing problems as LONG data type in Oracle is an old outdated data type (see http://www.orafaq.com/wiki/LONG) that shouldn’t be used, and tables can’t have more than one column ha...
hi, consider hibernate-link and JTA as peristence provider. How can I force em not to flush anything, and to handle it by myself? @Stateless public class SomeBean{ @PersistenceContext EntityManager em; public void method(){ em.persist(entity); // will get managed em.clear(); // everything gets unmanaged } } I would ex...
Question regarding Hibernate Polymorphism and extending a parent class (which I can not modify directly). My parent class is called Contact: @Entity @Table(name="contact") @Inheritance(strategy=InheritanceType.JOINED) public class Contact { @Id @GeneratedValue(strategy=GenerationType.IDENTITY) public long id; public String name;...
Anybody has an idea why adding the annotation-driven declaration leads to the aopalliance classes not found. I have not explicitly defined the weaving so using Spring defaults. Any help is appreciated ...
I'm new to NHibernate, and am trying to map a domain model that has a bit of inheritence etc (see this question for full details on my model, starting a new question as this is a different error) My base class has some abstract methods that each class beneath has to implement. This appears to be causing problems with NHibernate, even th...
Hello, Lets say I have two domain classes: class User { String name Role role } class Role { String name static belongsTo = [user: User] } and I create some records: def r1 = new Role(name: "role1").save() def r2 = new Role(name: "role2").save() new User(name: "user1", role: r1).save() new User(name: "user2", role: r2).save...
Given: @Inheritance(strategy=InheritanceType.SINGLE_TABLE) @DiscriminatorColumn(name="postType", discriminatorType=DiscriminatorType.STRING) public class Post {} @DiscriminatorValue(value = PostType.BUG) public class BugReport extends Post {} That is ... Bugs start life in this system as a Post. Later, they can be promoted(?) to bei...
Can i find any example of Java Hibernate in which have delete the data from multiple tables. ...
Hi guys, I've got an entity Case that has an id CaseId (unfortunately a string due to compability with a legacy system). This id is foreign key in the table Document, and each Case can have many documents (onetomany). I've put the following in my Case entity: @Id @Column(name = "CaseId", length = 20, nullable = false) private String ca...
Can i find the example of batch processing in java hibernate so that i can run delete queries on two tables. ...
I have a class A{Set b .....} which holds references of class B as Set. It is one to many relationship. Both class have sequencer in oracle. I put cascade to all in hibernate annotations. When i save class A, it gives me error that cannot insert null B.a_id . A-id is not nullable in my database. How can i persist this relatioship. ...
I've got an HQL statement like this: select new map (f1 as field1, (select ...) as field2) from ... where ... order by field2; It fails saying "Unknown column 'field2'". I experienced this in general that when using the "new map" statement, I can't reference the map names in the order by field. As HQL subqueries are only allowed in t...
Hello, I am having troubles with generating database schema with Hibernate Tools. This is my ant file <project name="Schema generator for MySQL database" basedir="."> <description> This file is used for running Hibernate Tools Ant task. It is used to generate database schema based on hibernate configuration </description> ...
Hi, i'm planning a historization for my java webapp (spring, hibernate). By googling I found Hibernate.Envers, which seems to be the perfect solution for me. Are there any comparable solutions? Thanks a lot! Jean ...
We have the following entity relationships where a User belongs to a particular Organization. My queries either look like "select * from User where org=:org" or "select * from User where org=:org and type=:type" I have separate indexes on the User class. The first query will be fine, because of the Index on the foreign key element. Does...
Hi all, I am working on a project which uses Java,Spring and Hibernate. I just came across a situaition like this. bean 1 : <bean id="cat" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean"> <property name="proxyInterfaces"> <list> <value>cat</value> </list> </property> ...
In my application I have two table, Group and Role, that are related between them with a @ManyToMany relationsheep. Since each Group can have many Roles and each Role can have many Groups. The first one: @Table(name = "groups") @Cache(usage = CacheConcurrencyStrategy.READ_WRITE) public class Groups { private Set<Role> ro...
Hi All, I'm having trouble creating a model for a couple entities that is sane in both Hibernate and the Database. Any help is appreciated. A company entity and table exists, which provides both a company name and a "company code". The company code must be unique. Company's may act as 2 different entities, clients or partners. We'd ...