春季休眠 - 保存多個實體相互關聯

Question

我試圖保存3個實體，地址，名稱和員工，員工包含地址和名稱。我已經爲每個實體制作了DAO，但由於某種原因，即使地址和名稱已保存並刷新，此異常也會彈出。

org.hibernate.exception.GenericJDBCException: could not insert: [employee.domain.Employee] 
at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:140) 
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:128) 
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66) 
at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:64) 
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2345) 
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2852) 
at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:71) 
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:273) 
at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:320) 
at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:203) 
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:129) 
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210) 
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195) 
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:117) 
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93) 
at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:685) 
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:677) 
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:673) 
at employee.dao.impl.EmployeeDAOImpl.save(EmployeeDAOImpl.java:39) 
at employee.service.impl.EmployeeServiceImpl.save(EmployeeServiceImpl.java:65) 
at employee.controller.EmployeeController.addEmployee(EmployeeController.java:45) 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
at java.lang.reflect.Method.invoke(Method.java:597) 
at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176) 
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:426) 
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414) 
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790) 
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719) 
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644) 
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:641) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) 
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:240) 
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164) 
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462) 
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164) 
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) 
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:563) 
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:399) 
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:317) 
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:204) 
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:311) 
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) 
at java.lang.Thread.run(Thread.java:662) 

java.sql.SQLException: Field 'addressID' doesn't have a default value 
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1073) 
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3597) 
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3529) 
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1990) 
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2151) 
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2625) 
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2119) 
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2415) 
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2333) 
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2318) 
at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:94) 
at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:57) 
... 46 more 

有人對此有何看法？

Answer 1

根據您的例外情況，其中一個原因是'addressID'在數據庫中是必需的，而插入該值時缺少.i可以假定''addressID'是主鍵，並且該值在保存時不會生成。

值java.sql.SQLException：字段「addressID」沒有默認值

Answer 2

在你的數據庫地址id列標記爲自動遞增？假設你想讓數據庫爲你生成ID。