我正在使用Hibernate 4.0最终版和ojdbc6来开发我的网络应用程序。一切都好,除了当我试图插入一个新的父母/孩子的关系。首先,这些是实体:
@Entity
@Table(name = "EMPLOYEE")
public class Employee implements Serializable, Cloneable {
@Id
@SequenceGenerator(name = "seq", sequenceName = "P_SEQ")
@GeneratedValue(generator = "seq")
@Column(name = "ID_EMPLOYEE")
private long idEmployee;
......
@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER, mappedBy = "employee", orphanRemoval = true)
@Fetch(FetchMode.SELECT)
@BatchSize(size = 10)
private Set<Address> addresses;
......
}
@Entity
@Table(name = "ADDRESS")
public class Address implements Serializable, Cloneable, Comparable {
@Id
@SequenceGenerator(name = "seq", sequenceName = "P_SEQ")
@GeneratedValue(generator = "seq")
@Column(name = "ID_ADDRESS")
private long idAddress;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "ID_EMPLOYEE")
private Employee employee;
.......
}
让我们看看这两个场景:
这是事务处理程序:
public static void save(Employee employee) throws HibernateException, Exception {
Session session = HibernateUtil.getCurrentSession();
session.beginTransaction();
try {
session.saveOrUpdate(employee);
} catch (Exception ex) {
session.refresh(employee);
HibernateUtil.closeSession();
throw ex;
}
HibernateUtil.commitTransaction();
}
public static void commitTransaction() throws Exception {
Transaction tx = getSessionFactory().getCurrentSession().getTransaction();
try {
if (tx != null && !tx.wasCommitted() && !tx.wasRolledBack()) {
tx.commit();
}
} catch (Exception ex) {
tx.rollback();
throw ex;
} finally {
closeSession();
}
}
你可以想象,2.b的案子是我关心的。我已经调试了事务,这是我调用保存()方法(在DAO类中)时得到的:
ideemployee
已正确设置(取自序列),地址绑定到员工,并具有有效的idAddress
(取自序列)
org。冬眠例外ConstraintViolationException
,尽管先前已正确设置了IdeEmployee
和idAddress
简而言之,异常仅在提交过程中出现。这就像是开始提交子对象(地址)而不是父对象(员工)。
我做错了什么?有人能帮我吗?提前谢谢。
更新。在上面,您可以看到问题涉及的两个类的主要部分。现在,除了异常跟踪之外,还有调用它们的方法。它们是按照它们被称为的顺序排列的。
属于数据备份类:
public void save(ActionEvent event) {
try {
EmployeeDAO.save(selectedEmployee);
newEmployee(); //reset the employee and its collections
} catch (ConstraintViolationException ex) {
Utilities.addFacesMessage(FacesMessage.SEVERITY_WARN, ex.getMessage(), "");
} catch (Exception ex) {
Utilities.log("error", ex.getCause().toString());
Utilities.addFacesMessage(FacesMessage.SEVERITY_WARN, ex.getMessage(), "");
}
}
属于EmployeeDAO类:
public static void save(Employee employee) throws HibernateException, Exception {
Session session = HibernateUtil.getCurrentSession();
session.beginTransaction();
try {
session.saveOrUpdate(employee);
} catch (Exception ex) {
session.refresh(employee);
HibernateUtil.closeSession();
throw ex;
}
HibernateUtil.commitTransaction();
}
属于HibernateUtil类:
public static void commitTransaction() throws Exception {
Transaction tx = getSessionFactory().getCurrentSession().getTransaction();
try {
if (tx != null && !tx.wasCommitted() && !tx.wasRolledBack()) {
tx.commit();
}
} catch (Exception ex) {
tx.rollback();
throw ex;
} finally {
closeSession();
}
}
紧接着,员工DAO.保存()方法调用会话。SaveOrUpdate(员工),我得到以下跟踪:
2013-03-12 07:22:55,958 [DEBUG, org.hibernate.internal.SessionImpl] Opened session at timestamp: 13630693759
2013-03-12 07:22:57,584 [DEBUG, org.hibernate.engine.transaction.spi.AbstractTransactionImpl] begin
2013-03-12 07:22:57,585 [DEBUG, org.hibernate.engine.jdbc.internal.LogicalConnectionImpl] Obtaining JDBC connection
2013-03-12 07:22:57,586 [DEBUG, org.hibernate.engine.jdbc.internal.LogicalConnectionImpl] Obtained JDBC connection
2013-03-12 07:22:57,587 [DEBUG, org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction] initial autocommit status: true
2013-03-12 07:22:57,587 [DEBUG, org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction] disabling autocommit
2013-03-12 07:23:00,285 [DEBUG, org.hibernate.SQL]
select
P_SEQ.nextval
from
dual
2013-03-12 07:23:00,361 [DEBUG, org.hibernate.id.SequenceGenerator] Sequence identifier generated: BasicHolder[java.lang.Long[5665]]
2013-03-12 07:23:00,365 [DEBUG, org.hibernate.event.internal.AbstractSaveEventListener] Generated identifier: 5665, using strategy: org.hibernate.id.SequenceGenerator
2013-03-12 07:23:00,411 [DEBUG, org.hibernate.SQL]
select
P_SEQ.nextval
from
dual
2013-03-12 07:23:00,417 [DEBUG, org.hibernate.id.SequenceGenerator] Sequence identifier generated: BasicHolder[java.lang.Long[5666]]
2013-03-12 07:23:00,421 [DEBUG, org.hibernate.event.internal.AbstractSaveEventListener] Generated identifier: 5666, using strategy: org.hibernate.id.SequenceGenerator
调用提交后:
2013-03-12 07:24:53,288 [DEBUG, org.hibernate.engine.transaction.spi.AbstractTransactionImpl] committing
2013-03-12 07:24:53,336 [DEBUG, org.hibernate.event.internal.AbstractFlushingEventListener] Processing flush-time cascades
2013-03-12 07:24:53,343 [DEBUG, org.hibernate.event.internal.AbstractFlushingEventListener] Dirty checking collections
2013-03-12 07:24:53,403 [DEBUG, org.hibernate.engine.internal.Collections] Collection found: [org.svq.pol.gesper.bean.Employee.addresses#5665], was: [<unreferenced>] (initialized)
2013-03-12 07:24:53,439 [DEBUG, org.hibernate.event.internal.AbstractFlushingEventListener] Flushed: 2 insertions, 0 updates, 0 deletions to 2 objects
2013-03-12 07:24:53,440 [DEBUG, org.hibernate.event.internal.AbstractFlushingEventListener] Flushed: 1 (re)creations, 0 updates, 0 removals to 1 collections
2013-03-12 07:24:53,453 [DEBUG, org.hibernate.internal.util.EntityPrinter] Listing entities:
2013-03-12 07:24:53,454 [DEBUG, org.hibernate.internal.util.EntityPrinter] org.svq.pol.gesper.bean.Address{address=fasdf, pc=, city=fadsf, idAddress=5666, operator=xxxxx, province=, telef2=, movDate=Tue Mar 12 07:21:15 CET 2013, telef1=, employee=org.svq.pol.gesper.bean.Employee#5665, version=0}
2013-03-12 07:24:53,456 [DEBUG, org.hibernate.internal.util.EntityPrinter] org.svq.pol.gesper.bean.Employee{surname=fadsf, user=null, dob=Tue Jan 01 00:00:00 CET 1980, address=[org.svq.pol.gesper.bean.Address#5666], pob=fadsf, operator=xxxxx, movDate=Tue Mar 12 07:21:15 CET 2013, version=0, name=fasdf, gender=H, idEmployee=5665, id=12345678}
2013-03-12 07:24:53,572 [DEBUG, org.hibernate.SQL]
insert
into
EMPLOYEE
(SURNAME, ID, MOV_DATE, DOB, GENDER, POB, OPERATOR, USER, VERSION, ID_EMPLOYEE)
values
(?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
2013-03-12 07:24:53,793 [DEBUG, org.hibernate.SQL]
insert
into
ADDRESS
(pc, address, MOV_DATE, OPERATOR, ID_EMPLOYEE, city, province, telef_1, telef_2, version, ID_ADDRESS)
values
(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
2013-03-12 07:24:53,943 [DEBUG, org.hibernate.engine.jdbc.spi.SqlExceptionHelper] ORA-02291: integrity constraint (PERPLADM.ADDRESS_EMPLOYEE_FK) violated - parent key not found
[n/a]
java.sql.SQLIntegrityConstraintViolationException: ORA-02291: integrity constraint (PERPLADM.ADDRESS_EMPLOYEE_FK) violated - parent key not found
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:445)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:396)
at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:879)
at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:450)
at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:192)
at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:531)
at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:207)
at oracle.jdbc.driver.T4CPreparedStatement.executeForRows(T4CPreparedStatement.java:1044)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1329)
at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3584)
at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:3665)
at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeUpdate(OraclePreparedStatementWrapper.java:1352)
at org.apache.tomcat.dbcp.dbcp.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:105)
at org.apache.tomcat.dbcp.dbcp.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:105)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.hibernate.engine.jdbc.internal.proxy.AbstractStatementProxyHandler.continueInvocation(AbstractStatementProxyHandler.java:122)
at org.hibernate.engine.jdbc.internal.proxy.AbstractProxyHandler.invoke(AbstractProxyHandler.java:81)
at $Proxy46.executeUpdate(Unknown Source)
at org.hibernate.engine.jdbc.batch.internal.NonBatchingBatch.addToBatch(NonBatchingBatch.java:56)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2849)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3290)
at org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:80)
at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:273)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:265)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:186)
at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:323)
at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:52)
at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1081)
at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:315)
at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.beforeTransactionCommit(JdbcTransaction.java:101)
at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit(AbstractTransactionImpl.java:175)
at org.svq.pol.gesper.utility.HibernateUtil.commitTransaction(HibernateUtil.java:57)
at org.svq.pol.gesper.dao.EmployeeDAO.save(EmployeeDAO.java:110)
at org.svq.pol.gesper.backing.DataBacking.save(DataBacking.java:498)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.apache.el.parser.AstValue.invoke(AstValue.java:262)
at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:278)
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
at javax.faces.event.MethodExpressionActionListener.processAction(MethodExpressionActionListener.java:148)
at javax.faces.event.ActionEvent.processListener(ActionEvent.java:88)
at javax.faces.component.UIComponentBase.broadcast(UIComponentBase.java:769)
at javax.faces.component.UICommand.broadcast(UICommand.java:300)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:409)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:964)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
2013-03-12 07:24:54,027 [WARN, org.hibernate.engine.jdbc.spi.SqlExceptionHelper] SQL Error: 2291, SQLState: 23000
2013-03-12 07:24:54,027 [ERROR, org.hibernate.engine.jdbc.spi.SqlExceptionHelper] ORA-02291: integrity constraint (PERPLADM.ADDRESS_EMPLOYEE_FK) violated - parent key not found
经过几天的挣扎,我最终找到了问题所在,显然找到了解决方案。据我所知,上面显示的映射是正确的(至少,应用程序正常工作)。唯一的问题是在数据库中,那里有一个插入序列的触发器。这样,每次我试图插入一个雇员(及其地址),Hibernate都会给我两个序列号(一个是父序列号,另一个是子序列号),这两个序列号都是正确设置的。然而,在进行提交的精确时刻,Oracle又给了我两个序列号,这次设置错误,我的意思是,外键与父级的主键不匹配。
但是由于我需要触发器,我必须再做一步:我必须修改这些触发器,以便它们检查:new是否正确。ID
值是否为NULL
。如果是,则意味着触发器是从Hibernate外部(即另一个应用程序)触发的,因此我从序列中获取nextval,否则我保留来自Hibernate的值。
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我被要求解决的最初问题是: 创建两个表:Employee:empID(PK)、empFname、empLname、deptID(FK)和Department:deptID(PK)、deptName、chairID。chairID是Employee表中的empID。在Department表中至少插入3行,在Employee表中至少插入6行。更新chairID时创建触发器,强制执行以下业务规则:一名员