Is there any way to save an object using Hibernate if there is already an object using that identifier loaded into the session? Doing session.contains(obj) seems to only return true if the session contains that exact object, not another object with the same ID. Using merge(obj) throws an exception if the object is new ...
One of our weblogic 8.1s has suddenly started logging giant amounts of logs and filling the disk. The logs giving us hassel resides in mydrive:\bea\weblogic81\common\nodemanager\NodeManagerLogs\generatedManagedServer1\managedserveroutput.log and the entries in the logfile is just the samekinds of entrires repeated again and again. S...
Hey all, I am using Hibernate in a Java application to access my Database and it works pretty well with MS-SQL and MySQL. But some of the data I have to show on some forms has to come from Text files, and by Text files I mean Human-Readable files, they can be CSV, Tab-Delimited, or even a key, value pair, per line since my data is as si...
Hi there, The system I am currently working on requires some role-based security, which is well catered for in the Java EE stack. The system intends to be a framework for business domain experts to write their code on top of. However, there is also a requirement for data 'security'. That is, what information is visible to an end user. ...
@Entity @Inheritance(strategy = InheritanceType.SINGLE_TABLE) public class Problem { @ManyToOne private Person person; } @Entity @DiscriminatorValue("UP") public class UglyProblem extends Problem {} @Entity public class Person { @OneToMany(mappedBy="person") private List< UglyProblem > problems; } I think it is pretty...
Hi, Our design has one jvm that is a jboss/webapp (read/write) that is used to maintain the data via hibernate (using jpa) to the db. The model has 10-15 persistent classes with 3-5 levels of depth in the relationships. We then have a separate jvm that is the server using this data. As it is running continuously we just have one long ...
Hi, In my database, I have an entity table (let's call it Entity). Each entity can have a number of entity types, and the set of entity types is static. Therefore, there is a connecting table that contains rows of the entity id and the name of the entity type. In my code, EntityType is an enum, and Entity is a Hibernate-mapped class. in ...
I have the situation where i use GIS software which stores the information about GIS objects into separate database table for each type/class of GIS object (road, river, building, sea, ...) and keeps the metadata table in which it stores info about the class name and its DB table. Those GIS objects of different classes share some parame...
I have a one to many relationship between two tables. The many table contains a clob column. The clob column looks like this in hibernate: @CollectionOfElements(fetch = EAGER) @JoinTable(name = NOTE_JOIN_TABLE, joinColumns = @JoinColumn(name = "note")) @Column(name = "substitution") @IndexColumn(name = "listIndex", base = 0) @Lob privat...
(see here for the problem I'm trying to solve) How do you get hibernate to log clob values it's going to insert. It is logging other value types, such as Integer etc. I have the following in my log4j config: log4j.logger.net.sf.hibernate.SQL=DEBUG log4j.logger.org.hibernate.SQL=DEBUG log4j.logger.net.sf.hibernate.type=DEBUG log4j.logg...
What are the steps required to enable Hibernate's second-level cache, when using the Java Persistence API (annotated entities)? How do I check that it's working? I'm using JBoss 4.2.2.GA. From the Hibernate documentation, it seems that I need to enable the cache and specify a cache provider in persistence.xml, like: <property name="hib...
I'm looking for a builder for HQL in Java. I want to get rid of things like: StringBuilder builder = new StringBuilder() .append("select stock from ") .append( Stock.class.getName() ) .append( " as stock where stock.id = ") .append( id ); I'd rather have something like: HqlBuilder builder = new HqlBuilder() .selec...
I'm trying to do a basic "OR" on three fields using a hibernate criteria query. Example class Whatever{ string name; string address; string phoneNumber; } I'd like to build a criteria query where my search string could match "name" or "address" or "phoneNumber". ...
It seems to me that introducing an ORM tool is supposed to make your architecture cleaner, but for efficiency I've found myself bypassing it and iterating over a JDBC Result Set on occasion. This leads to an uncoordinated tangle of artifacts instead of a cleaner architecture. Is this because I'm applying the tool in an invalid Context,...
Hello, I'm trying to get only the list of id of object bob for example instead of the list of bob. It's ok with a HQL request, but I would know if it's possible using criteria ? An example : final StringBuilder hql = new StringBuilder(); hql.append( "select bob.id from " ) .append( bob.class.getName() ).append( " bob " ) .appe...
Hi, I'm migrating a Hibernate application's cache from EHCache to JBoss TreeCache. I'm trying to find how to configure the equivalent to maxElementsOnDisk to limit the cache size on disk, but I couldn't find anything similar to configure in a FileCacheLoader with passivation activated. Thanks ...
In Hibernate we have two classes with the following classes with JPA mapping: package com.example.hibernate import javax.persistence.Entity; import javax.persistence.FetchType; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import javax.persistence.ManyToOne; @Entity publ...
I have a large application that uses EJB 2.x entity beans (BMP). This is well-known to be a horrible persistence strategy (I can elaborate if necessary). I'd like to start migrating this application to use a much more expressive, transparent, and non-invasive persistence strategy, and given my company's previous experience with it, Hibe...
Hi, With Hibernate, can you create a composite ID where one of the columns you are mapping to the ID can have null values? This is to deal with a legacy table that has a unique key which can have null values but no primary key. I realise that I could just add a new primary key column to the table, but I'm wondering if there's any way ...
Relating to my earlier question, I want to ensure all the child objects are loaded as I have a multiple threads that may need to access the data (and thus avoid lazy loading exceptions). I understand the way to do this is to use the "fetch" keyword in the query (EJB QL). Like this: select distinct o from Order o left join fetch o.orde...