Hi, I am preparing a Hibernate training. The training will be two days long and targeted at somewhat experienced Java developers with no Hibernate experience. So what things would you cover / leave out in such a training? ...
Hi all, I want to perform a LEFT OUTER JOIN between two tables using the Criteria API. All I could find in the Hibernate documentation is this method: Criteria criteria = this.crudService .initializeCriteria(Applicant.class) .setFetchMode("products", FetchMode.JOIN) .createAlias("products", "product"...
I saw the project AutoFetch for Hibernate. It sounds pretty cool - when Hibernate queries are executed, it checks for the N+1 problem. If there was a problem, next time that query (it figures out which one it is by looking at the stacktrace) gets executed it adds appropriate fetch statements. It says on the website "Autofetch integrates...
I have an app using Spring, JPA (Hibernate) and the Java validation framework (Hibernate Validator). I would like to be able to annotate fields in our domain model that are allowed to contain HTML and have them automatically sanitized at commit time. Anyone know a clever way to do this? I have tried using the validation framework but th...
Hi, In my code, I did as follows: queried for a course entity populate it with the given course data. courseDao.update(entity) which internally calls persist(entity) method. Surprisingly, the data is got updated successfully. I am confused with this behaviour of persist method. Please help me out. code is as below: //My Service....
I'm using Hibernate to work on a new project, and as I work I'm realizing that my original vision for the application may not end up being its destiny. Data that I think is not going to be often requested (and thus lazy-loaded) might end up being needed for 85% of requests. Conversely, data that I'm loading under the assumption it will b...
Hi all, I am doing a LEFT OUTER JOIN, but I am only able to apply Restrictions on the first table. Is there a way ti apply on the second table as well? Here is my code: Criteria criteria = this.crudService .initializeCriteria(Applicant.class).setFetchMode("products", FetchMode.JOIN);. This works (applicant has a...
I am looking for a way to have a typesafe primary key for my entities using generics in Hibernate. Instead of doing this @Entity public class User{ @PrimaryKey Long id } I was thinking of doing this... @Entity public class User{ @PrimaryKey PrimaryKey<User,Long> id } Or take the type inference even further... Any ideas? Has ...
I can validate the length of a String with an annotation like: @Length(max = 255) But what if I want to verifiy that the length is either 5 or 9? Can this be done with an annotation? ...
Can somebody please help me complete / clean up this query. I am trying to first get the number of rows in the table, then I need to actually fetch a set of rows. I am not sure how I can use the same criteria instance to perform both queries. To fetch the count I have something like this: Criteria criteria = session.createCriteria(My...
Hi, Using Grails (GORM) I'm populating a collection upon creating an object and I must return the newly populated collection with ids. class A { static hasMany = [bees:B] } class B { static belongsTo = [a:A] } As noticed, a one-to-many relationship when the many side belongs to the one side for full cascading If A is not saved befor...
We've been implementing Hibernate recently as a replacement for JDBC. What I like is not having to constantly write SELECT, UPDATE, INSERT statements and the associated PreparedStatement and ResultSet code. However we've been struggling with random bizarre behavior (example A) which I find hard to understand and resolve due to all the ...
Hello! During Hibernate session I am loading some objects and some of them are loaded as proxies due to lazy loading. It's all OK and I don't want to turn lazy loading off. But later I need to send some of the objects (actually one object) to the GWT client via RPC. And it happens that this concrete object is a proxy. So I need to turn...
Hi, how i can define and use a strategy of ID (primary keys) generation for my domain classes ? I want to put a prefix for the primaryKey of some domain classes like customers and manufacturers based in the ID (primary key) of their hometown. I know that Hibenate has a API for this, but who i can integrate such strategy in my Grails app...
Hi, I've been googling around for a straight-forward solution on getting our new postgresql + hibernate setup working with case insensitive search, without luck. We had previously been using mysql which has a policy on case insensative searching however Postgresql seems to lack this. For example, I'd like Hibernate/Postgresql to return ...
I have a parent (Program) pojo with a many-to-many relationship with their children (Subscriber). The problem is when it serialises a Program, it also serialises the Program's Subscribers, which involves serialising their Programs, which involves serialising their Subscribers, until it has serialised every single Program & Subscriber in...
Hi, I can easily log last modified date, modified by etc. However, I need old and new value to be logged too. In the interceptor, I can fire a select before postflush starts executing to get the value of the current record. Then I can run a diff between this record and the new one to see what changed and log that information as old and ...
I am writting the code to upload file on oracle as BLOB but while saving that file its giving me the exception java.sql.SQLException: ORA-01460: unimplemented or unreasonable following are the functions to convert my blob type to byteArray private byte[] convertToByteArray(Blob fromBlob) { ByteArrayOutputStream baos = new ByteArr...
I've a collection mapped, which caches fine in the L2Cache. As soon as I apply a filter to the collection, the L2Cache is not used. I can't use a where clause in the collection as I need it to be more dynamic than that. Anyone have any ideas ?? ...
I'm pretty new to Nhibernate, so apologies for a long - winded description I suspect that changing the structure of the legacy DB is probably the best option, but I want to try and get NHibernate to deal with it. Basically the structure is this an EndPoint has an address and a contact. Endpoint is stored in a table with a composite ID ...