Does JPA support embedding a class attribute whose type is a parameterized generic or java.lang.Object? For example: public class Foo<T>; { private T param1; private Object param2; } I have a use case where I have a class that "wraps" some arbitrary class (the generic T or java.lang.Object) via aggregation plus contains pr...
I have following model: Report, ReportSection and ReportSectionProperty. Report has zero to many ReportSections, ReportSection has zero to many ReportSectionPropert-ies. This would qualifie as three levels deep object graph. I create new Report, then add some sections to it, then add some properties to it. When I try to persist Report...
Hello, I am using "double" in Hibernate .hbm.xml files, and when I generate classes with Hibernate Tool I get class property which has primitive type double. I want this property to be java wrapper type Double. How can I achieve this? If I change this manually in my classes, is it going to give any issues to hibernate? Thanks ...
HI, i am trying to use the above spring hibernate temnplate method do a simple query based on a specific ID from the database but the problem is that the query doesnt replace the ":" character from the sql string below into the value contained in "id". i thought that this method replaces ":" with the given parameter i set in the method ...
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 This is causing problems as LONG data type in Oracle is an old outdated data type (see http://www.orafaq.com/wiki/LONG) that shouldn’t be used, and tables can’t have more than one column ha...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;...
I'm trying to persist 3 entities (exp,def,meng) in a transaction, and then persist another 2 (def', meng'), where meng' is related to exp. However, as I attempt to persist meng' eclipselink/jpa2 is being told to: Call: INSERT INTO EXPRESSION (EXPRESSION, GENDER) VALUES (?, ?) bind => [exp, null] which will throw an expession sinc...
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...
That is, if you have all the has_many, has_one, belongs_to, and has many ... :through and has_many_and_belongs_to wrong, but your program only touch the model.instance_variable but not model.some_other_model # or model.some_other_model.some_method_or_variable will you app do anything wrong or do anything bad to the database? Th...
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...
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. ...
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...
Hey all, I went to the Visual Studio 2010 launch and remember seeing someone generate entites (which I am using and is awesome) from a database, but then taking it a step further and creating a web front end. The front end would allow modification/deletion of existing data and addition of new, and it was all generated. It was ugly, of...
Using NHibernate I need to insert an entity into a database that has a child entity. Example: public class Reservation { public int Id { get; set; } public Service Service { get; set; } } public class Service { public int Id { get; set; } } I need to create a new Reservation and insert it. However, when constructing the R...
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 ...
Alright, so after years of feeling that I've been doing it the wrong way, what is the best way to interact with a MySQL database, using PHP. Going to start off small-scale, but eventually hoping to grow large scale. I'd love to be able to use objects, like such $book = new Book(1342); echo $book->title; So, what is the best way to go...