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POHibernate @Version annotation
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18982948
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2013-09-24T13:25:51.977
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2014-12-04T16:57:30.597
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2014-05-13T14:46:53.257
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What is the relation between hibernate @version and ManyToOne Mapping. Assume that i am having two tables Department and Employee. Here is Deparment is the master table and Employee in the detail table. In the Employee table, departmentID is reference as foreign key. Here is my classes <pre><code>Public class Department { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private long ID; @Version private Long version; //Getters and Setters } public class Employee { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private long ID; @Version private Long version; @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "departmentID" ) private Department department; } </code></pre> And also, Spring handles the session. So assume that, in one page, particular department is fetched and stored in the HTTP session. Now in another page, i am trying to do the following <pre><code>Employee emp = new Employee(); emp.setName('Test') emp.setDepartment(dept) // already stored in the HTTP session variable service.save(emp) </code></pre> Now i am getting the following exception <pre><code>org.springframework.dao.InvalidDataAccessApiUsageException: object references an unsaved transient instance - save the transient instance before flushing: </code></pre> And just it make one change as follow and there is errror <pre><code>Employee emp = new Employee(); emp.setName('Test') dept.setVersion(0); emp.setDepartment(dept) // already stored in the HTTP session variable service.save(emp) </code></pre> My Spring config <pre><code><?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:p="http://www.springframework.org/schema/p" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd"> <bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager"> <property name="sessionFactory" ref="sessionFactory" /> </bean>  <context:annotation-config /> <context:component-scan base-package="com.product.business" /> <tx:annotation-driven transaction-manager="transactionManager" />  <bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor" /> <bean id="CRUDService" class="com.product.business.service.CRUDServiceImpl" /> <bean id="AuthService" class="com.product.business.service.AuthServiceImpl" /> </code></pre> Service Implementation <pre><code>package com.product.business.service; import java.io.Serializable; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.dao.DataAccessException; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Transactional; import com.product.business.dao.CRUDDao; @Service public class CRUDServiceImpl implements CRUDService { @Autowired private CRUDDao CRUDDao; @Transactional(readOnly = true) public <T> List<T> getAll(Class<T> klass) { return CRUDDao.getAll(klass); } @Transactional public <T> void Save(T klass) throws DataAccessException { CRUDDao.Save(klass); } @Transactional public <T> void delete(T klass) throws DataAccessException { CRUDDao.delete(klass); } @Transactional public <T> T GetUniqueEntityByNamedQuery(String query, Object... params) { return CRUDDao.GetUniqueEntityByNamedQuery(query, params); } @Transactional public <T> List<T> GetListByNamedQuery(String query, Object... params) { return CRUDDao.GetListByNamedQuery(query, params); } @Override @Transactional(readOnly = true) public <T> Long getQueryCount(String query, Object... params) { return CRUDDao.getQueryCount(query, params); } @Override @Transactional(readOnly = true) public <T> T findByPrimaryKey(Class<T> klass, Serializable id) { return CRUDDao.findByPrimaryKey(klass, id); } } </code></pre>
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<java><hibernate><hibernate-mapping><spring-orm>
Title
Hibernate @Version annotation
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1. PO
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1. USBertrand88
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1. USSenthil Muthiah
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Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.