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  • What are the best books for Hibernate & JPA?

    - by Justin Standard
    My team is about to build a new product and we are using Hibernate/JPA as the persistence mechanism. There are other book posts on stackoverflow, but I couldn't find one that matched my needs. My manager will be purchasing books for our team to use as a resource so... What are the best books about Hibernate and JPA? (Please list each book suggestion in a separate answer) (If you already see your book answered, instead of adding it again, just vote it up)

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  • hibernate for dynamic table creation

    - by user369316
    i AM A HIBERNATE BEGINNER ,Since i need to create dynamic tables with dynamic fields in them i chose to use hibernate . As far as my understanding , creating tables requires a class with the fields defined in the class . How do i generate the classes dynamically based on the table with the required fields ?

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  • Hibernate @DiscriminatorColumn and @DiscriminatorValue issue

    - by user224270
    I have this parent class: @Entity @Inheritance(strategy = InheritanceType.JOINED) @Table(name = "BSEntity") @DiscriminatorColumn(name = "resourceType", discriminatorType = DiscriminatorType.STRING, length = 32) public abstract class BaseEntity { and the subclass @Entity @Table(name = "BSCategory") @DiscriminatorValue("Category") public class CategoryEntity extends BaseEntity { But when I run the program, I get the following error: 2010-06-03 10:13:54,222 [main] WARN (org.hibernate.util.JDBCExceptionReporter:100) - SQL Error: 1364, SQLState: HY000 2010-06-03 10:13:54,222 [main] ERROR (org.hibernate.util.JDBCExceptionReporter:101) - Field 'resourceType' doesn't have a default value Any thoughts? Updated: Database is MySQL. I have also changed inheritance strategy to JOINED instead of SINGLE_TABLE. Help

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  • HIbernate query

    - by sarah
    Hi I want to execute a query using hibernate where the requirment is like select * from user where regionname='' that is select all the users from user where region name is some data How to write this in hibernate The below code is giving result appropraitely Criteria crit= HibernateUtil.getSession().createCriteria(User.class); crit.add(Restrictions.eq("regionName", regionName));

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  • Problems using Hibernate and Spring in web application

    - by user628480
    Hi.I'm having NullPointerException trying to getCurrentSession() java.lang.NullPointerException servlets.ControlServlet.doPost(ControlServlet.java:46) javax.servlet.http.HttpServlet.service(HttpServlet.java:709) javax.servlet.http.HttpServlet.service(HttpServlet.java:802) I use Tomcat 5.5 index.jsp page: <%@ page language="java" contentType="text/html; charset=ISO-8859-1"pageEncoding="ISO-8859-1"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title></title> </head> <body> <%@ page import="java.util.List" %> <%@ page import="data.Singer" %> <jsp:useBean id="singer" class="data.Singer" scope="session"/> <jsp:setProperty name="singer" property="*" /> <form action="ControlServlet" method="POST"> <form method=“POST”> Name:<br /> <input type=“text” name="name" /><br /> Type:<br /> <input type=“text” name="type" /><br /> <input type="submit" name="Add song" value="Add song"> <input type="submit" name="save" value="Save" /><br><br> <input type ="submit" name="values" value="Get values" > </form> </body> </html> web.xml <?xml version="1.0" encoding="UTF-8"?> <web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <display-name>webproject</display-name> <context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/beans.xml, /WEB-INF/conf.xml, /WEB-INF/singers.hbm.xml, /WEB-INF/songs.hbm.xml, /WEB-INF/singerbeans.xml, /WEB-INF/songbeans.xml</param-value> </context-param> <servlet> <servlet-name>context</servlet-name> <servlet-class>org.springframework.web.context.ContextLoaderServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet> <servlet-name>test</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>test</servlet-name> <url-pattern>*.*</url-pattern> </servlet-mapping> <servlet> <servlet-name>action</servlet-name> <servlet-class>org.apache.struts.action.ActionServlet</servlet-class> <init-param> <param-name>config</param-name> <param-value>/WEB-INF/beans.xml, /WEB-INF/conf.xml, /WEB-INF/singers.hbm.xml, /WEB-INF/songs.hbm.xml, /WEB-INF/singerbeans.xml, /WEB-INF/songbeans.xml</param-value> </init-param> <init-param> <param-name>debug</param-name> <param-value>2</param-value> </init-param> <init-param> <param-name>detail</param-name> <param-value>2</param-value> </init-param> <load-on-startup>2</load-on-startup> </servlet> <servlet> <description> </description> <display-name>ControlServlet</display-name> <servlet-name>ControlServlet</servlet-name> <servlet-class>servlets.ControlServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>action</servlet-name> <url-pattern>*.*</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>ControlServlet</servlet-name> <url-pattern>/ControlServlet</url-pattern> </servlet-mapping> </web-app> ControlServlet.java public class ControlServlet extends HttpServlet { private static final long serialVersionUID = 1L; @Autowired private SingerDao singerdao; public SingerDao getSingerDao() { return singerdao; } public void setSingerDao(SingerDao singerdao) { this.singerdao = singerdao; } public ControlServlet() { super(); // TODO Auto-generated constructor stub } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { if (request.getParameter("values") != null) { response.getWriter().println(singerdao.getDBValues()); } } } and SingerDao.java public class SingerDao implements SingerDaoInterface { @Autowired private SessionFactory sessionFactory; public void setSessionFactory(SessionFactory sessionFactory) { this.sessionFactory = sessionFactory; } public List getDBValues() { Session session = getCurrentSession(); List<Singer> singers = session.createCriteria(Singer.class).list(); return singers; } private org.hibernate.classic.Session getCurrentSession() { return sessionFactory.getCurrentSession(); } public void updateSinger(Singer singer) { Session session = getCurrentSession(); session.update(singer); } public Singer getSinger(int id) { Singer singer = null; Session session = getCurrentSession(); singer = (Singer) session.load(Singer.class, id); return singer; } public void deleteSinger(Singer singer) { Session session = getCurrentSession(); session.delete(singer); } public void insertRow(Singer singer) { Session session = getCurrentSession(); session.save(singer); } } In simple Java Project it works fine.I think sessionFactory doesn't autowires,but why? Thanks all.

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  • Unable to instantiate class containing Hibernate code

    - by Steven
    hi, i am developing a plug in which deals with hibernate project.I get some classes which contain Session and Session factory .Then i want to instantiate an object of these classes using reflections which i am not able to do it even after including the hibernate jars in the classpath of my plug in.What is the problem?Help

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  • How to check for case sensitive in hibernate criteria

    - by dhiraj
    0 vote down star I have used hibernate to fetch the login information from the mysql database. But the problem is that say for example the user name is 'dhiraj' in the database, now the login is successful by entering the user name, but it is also allowing to enter by taking the user name in uppercase also, e.g., 'DHIRAJ'. I want to restrict it to as it in the database. Can you tell me how to achieve that in hibernate?

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  • How to do multiple column UniqueConstraint in hbm?

    - by DataSurfer
    Working on some legacy hibernate code. How do I do the following with hbm.xml(hibernate mapping file) instead of with annotations? @Table(name="users", uniqueConstraints = { @UniqueConstraint(columnNames={"username", "client"}), @UniqueConstraint(columnNames={"email", "client"}) }) public class User implements Serializable { private static final long serialVersionUID = 1L; @Id private int id; private String username; private String email; private Client client; }

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  • hibernate - uniqueResult silently fails

    - by robinmag
    I have a login controller that use the hibernate uniqueResult method. Everything works fine when i test it in eclipse's tomcat server. But when i deploy my webapps to tomcat server (on the same machine) it fails: it always returns null even i use the correct credential. Here is my hibernate code: session.createCriteria(User.class) .add(Restrictions.eq(User.USERNAME_FIELD, userName)) .add(Restrictions.eq(User.PASSWORD_FIELD, password)).uniqueResult(); Thank you!

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  • Hibernate's version values in Grails app

    - by xain
    I'm looking at a database dump file, and I see many records in various tables with their version number set in values other than 0 (even 94 in one case). I understand it has to do with hibernate locking strategy, but my concern is that today is Sunday, and the site has almost no visitors so is: is this normal ? Or is there a known hibernate bug or even some programming malpractice producing this ?

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  • Changing hibernate batch size programatically

    - by user179056
    Hello, Is possible to change hibernate.jdbc.batch_size programmatically? I understand hibernate.jdbc.batch_size is a application level parameter, wanted to know if i can use it specifically for certain HQL inserts and not others. I would change the code only for those HQL inserts The big picture is that i need to introduce batch inserts to make the web application performant in some scenarios, but i do not want to jeopardize the normal inserts which work right now. Any pointers would help thanks Sameer

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  • Hibernate Queries

    - by Schildmeijer
    Using Named Queries (located in your hibernate mapping xml file) is a nice way to separate your queries from your buisness logic. But what are the alternatives if your are using Hibernate Annotations for mapping?

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  • Hibernate Distributed Cache

    - by DD
    Hi, I'm looking to setup Hibernate with distributed cache where I have one application writing to the DB and another one reading from the DB. Is there an easy way to notify the reading application when the writing one has written through Hibernate? The distributed cache will invalidate the cache but I need the reading application to know a change has been made to refresh its data immediately. Thanks, D

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  • from Hibernate hbm to JPA annotations, a challenging one

    - by nodje
    Hi, I've been struggling with this one for quite some time already. It appears a lot less simple than I thought it'd be: This is included in the "COTISATION" table mapping an uses SynchroDataType, extending Hibernate UserType. This works really great, and I can't find a way to translate it to proper JPA, while keeping the convenience of it. Does someone has a solution for that kind of one-to-one mapping? cheers

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  • Why use Hibernate/nHibernate?

    - by ProgrammingPope
    I have found myself doing a lot of work to get nHibernate setup and am left wondering: Why use a framework like Hibernate/NHibernate? I am sure that quite a few people love the framework but I am unclear on the advantages and disadvantages. What are the advantages and disadvantages of lazy loading, and are there other features to Hibernate? Is there anything that makes a framework like this easier to use (best practices, other frameworks, etc)?

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  • Reuse Hibernate session in thread

    - by Marco
    Hello, I've read somewhere that when a session is flushed or a transaction is committed, the session itself is closed by Hibernate. So, how can i reuse an Hibernate Session, in the same thread, that has been previously closed? Thanks

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  • Hibernate query cache automatically refreshed on external update?

    - by artgon
    I'm creating a service that has read-only access to the database. I have a query cache and a second level cache enabled (READ_ONLY mode) in Hibernate to speed up the service, as the tables being accessed change rarely. My question is, if someone goes into the DB and changes the tables manually (i.e. outside of Hibernate), does the cache recognize automatically that it needs to be cleared? Is there a time limit on the cache?

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  • HasMany relation inside a Join Mapping

    - by Sean McMillan
    So, I'm having a problem mapping in fluent nhibernate. I want to use a join mapping to flatten an intermediate table: Here's my structure: [Vehicle] VehicleId ... [DTVehicleValueRange] VehicleId DTVehicleValueRangeId AverageValue ... [DTValueRange] DTVehicleValueRangeId RangeMin RangeMax RangeValue Note that DTValueRange does not have a VehicleID. I want to flatten DTVehicleValueRange into my Vehicle class. Tgis works fine for AverageValue, since it's just a plain value, but I can't seem to get a ValueRange collection to map correctly. public VehicleMap() { Id(x => x.Id, "VehicleId"); Join("DTVehicleValueRange", x => { x.Optional(); x.KeyColumn("VehicleId"); x.Map(y => y.AverageValue).ReadOnly(); x.HasMany(y => y.ValueRanges).KeyColumn("DTVehicleValueRangeId"); // This Guy }); } The HasMany mapping doesn't seem to do anything if it's inside the Join. If it's outside the Join and I specify the table, it maps, but nhibernate tries to use the VehicleID, not the DTVehicleValueRangeId. What am I doing wrong?

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  • NHibernate: Mapping multiple classes from a single table row

    - by Michael Kurtz
    I couldn't find an answer to this specific question. I am trying to keep my domain model object-oriented and re-use objects where possible. I am having an issue determining how to provide a mapping to multiple classes from a single row. Let me explain with an example: I have a single table, call it Customer. A customer has several attributes; but, for brevity, assume it has Id, Name, Address, City, State, ZipCode. I would like to create a Customer and Address class that look like this: public class Customer { public virtual long Id {get;set;} public virtual string Name {get;set;} public virtual Address Address {get;set;} } public class Address { public virtual string Address {get;set;} public virtual string City {get;set;} public virtual string State {get;set;} public virtual string ZipCode {get;set;} } What I am having trouble with is determining what the mapping would be for the Address class within the Customer class. There is no Address table and there isn't a "set" of addresses associated with a Customer. I just want a more object-oriented view of the Customer table in code. There are several other tables that have address information in them and it would be nice to have a reusable Address class to deal with them. Addresses are not shared so breaking all addresses into a separate table with foreign keys seems to be overkill and, actually, more painful since I would need foreign keys to multiple tables. Can someone enlighten me on this type of mapping? Please provide an example if you can. Thanks for any insights! -Mike

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  • Spring URL mapping question

    - by es11
    I am using Java with Spring framework. Given the following url: www.mydomain.com/contentitem/234 I need to map all requests that come to /contentitem/{numeric value} mapped to a given controller with the "numeric value" passed as a parameter to the controller. Right now in my servlet container xml I have simple mappings similar to the following: ... <entry key="/index.html"> <ref bean="homeController" /> </entry> ... I am just wondering what I need to add to the mapping in order to achieve what I described? Edit: I unaccepted the answer temporarily because I can't seem to figure out how to do the mapping in my web.xml (I am using annotations as described in axtavt's answer below). How do I add a proper <url-pattern>..</url-pattern> in my <servlet-mapping> so that the request for "/contentitem/{numeric_value}" gets properly picked up? Thanks!

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  • Strategies for Mapping Views in NHibernate

    - by Nathan Fisher
    It seems that NHibernate needs to have an id tag specified as part of the mapping. This presents a problem for views as most of the time (in my experience) a view will not have an Id. I have mapped views before in nhibernate, but they way I did it seemed to be be messy to me. Here is a contrived example of how I am doing it currently. Mapping <class name="ProductView" table="viewProduct" mutable="false" > <id name="Id" type="Guid"> <generator class="guid.comb" /> </id> <property name="Name" /> <!-- more properties --> </class> View SQL Select NewID() as Id, ProductName as Name, --More columns From Product Class public class ProductView { public virtual Id {get; set;} public virtual Name {get; set;} } I don't need an Id for the product or in the case of some views I may not have an id for the view, depending on if I have control over the View Is there a better way of mapping views to objects in nhibernate?

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