最近用hiernate執行saveOrUpdate的時候，報錯了。錯誤信息如下

2018-11-12 13:55:32,265 [WARN ] [http-bio-8080-exec-9] org.hibernate.engine.jdbc.spi.SqlExceptionHelper - SQL Error: 1062, SQLState: 23000 2018-11-12 13:55:32,266 [ERROR] [http-bio-8080-exec-9] org.hibernate.engine.jdbc.spi.SqlExceptionHelper - Duplicate entry '20' for key 'UK_qmwxrj10x1lnvufjefkkfffw9'

分析原因，大致是因為
agent關聯了userinfo。
在hibernate中，如果agent對象關聯了userinfo對象，當要執行插入或者更新的時候，設置agent對象所關聯的userinfo對象，大概是要這么寫。

if (null == agent.getId() || null == agent.getUserInfo()) {agent.setUserInfo(userInfo);}agentService.saveOrUpdate(agent);

而不能直接寫（可能如果userinfo是直接用agent拉取的可以這么寫，其他方式不行）

agent.setUserInfo(userInfo); agentService.saveOrUpdate(agent);

agent對象

@ManyToOne(fetch = FetchType.LAZY)@JoinColumn(name = "user_info", unique = true, nullable = false)public UserInfo getUserInfo() {return this.userInfo;} 2018-11-12 13:55:32,265 [WARN ] [http-bio-8080-exec-9] org.hibernate.engine.jdbc.spi.SqlExceptionHelper - SQL Error: 1062, SQLState: 23000 2018-11-12 13:55:32,266 [ERROR] [http-bio-8080-exec-9] org.hibernate.engine.jdbc.spi.SqlExceptionHelper - Duplicate entry '20' for key 'UK_qmwxrj10x1lnvufjefkkfffw9' 2018-11-12 13:55:32,280 [INFO ] [http-bio-8080-exec-9] org.hibernate.engine.jdbc.batch.internal.AbstractBatchImpl - HHH000010: On release of batch it still contained JDBC statements org.hibernate.exception.ConstraintViolationException: could not execute statementat org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:72)at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49)at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:126)at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:112)at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:190)at org.hibernate.engine.jdbc.batch.internal.NonBatchingBatch.addToBatch(NonBatchingBatch.java:62)at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:3281)at org.hibernate.persister.entity.AbstractEntityPersister.updateOrInsert(AbstractEntityPersister.java:3183)at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:3525)at org.hibernate.action.internal.EntityUpdateAction.execute(EntityUpdateAction.java:159)at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:463)at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:349)at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:350)at org.hibernate.event.internal.DefaultAutoFlushEventListener.onAutoFlush(DefaultAutoFlushEventListener.java:67)at org.hibernate.internal.SessionImpl.autoFlushIfRequired(SessionImpl.java:1191)at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1257)at org.hibernate.internal.QueryImpl.list(QueryImpl.java:103)at org.hibernate.internal.AbstractQueryImpl.uniqueResult(AbstractQueryImpl.java:966)at xxxxxxxx.orm.dao.impl.BaseDaoImpl.getUniqueResult(BaseDaoImpl.java:579)at xxxxxxxx.service.impl.AgentServiceImpl.getByUserInfo(AgentServiceImpl.java:98)at xxxxxxxx.service.impl.AgentServiceImpl$$FastClassBySpringCGLIB$$40cd90a7.invoke(<generated>)at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:720)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:655)at xxxxxxxx.service.impl.AgentServiceImpl$$EnhancerBySpringCGLIB$$a255d538.getByUserInfo(<generated>)at xxxxxxxx.service.impl.SignServiceImpl.SignByTianWeiAndWuzhongAndUser(SignServiceImpl.java:87)at xxxxxxxx.service.impl.BillServiceImpl.createZhongCaiPDF(BillServiceImpl.java:719)at xxxxxxxx.service.impl.BillServiceImpl.updateBillWuZhongKuaiCai(BillServiceImpl.java:1105)at xxxxxxxx.service.impl.BillServiceImpl$$FastClassBySpringCGLIB$$6a0a0297.invoke(<generated>)at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:720)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:655)at xxxxxxxx.service.impl.BillServiceImpl$$EnhancerBySpringCGLIB$$cca9e108.updateBillWuZhongKuaiCai(<generated>)at xxxxxxxx.service.user.operation.arbitration.ApplyArbitrationServiceImpl.updateWuZhongKuaiCai(ApplyArbitrationServiceImpl.java:123)at xxxxxxxx.service.user.operation.arbitration.ApplyArbitrationServiceImpl$$FastClassBySpringCGLIB$$dc0a0462.invoke(<generated>)at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:720)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:655)at xxxxxxxx.service.user.operation.arbitration.ApplyArbitrationServiceImpl$$EnhancerBySpringCGLIB$$8a87dd49.updateWuZhongKuaiCai(<generated>)at xxxxxxxx.controller.user.operation.arbitration.ApplyArbitrationController.apply(ApplyArbitrationController.java:321)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)at java.lang.reflect.Method.invoke(Unknown Source)at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136)at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:114)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:208)at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:177)at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.springframework.orm.hibernate4.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:151)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:123)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at xxxxxxxx.spring.filter.RemoveUrlJsessionIdFilter.doFilter(RemoveUrlJsessionIdFilter.java:58)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:442)at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1083)at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:640)at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)at java.lang.Thread.run(Unknown Source) Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '20' for key 'UK_qmwxrj10x1lnvufjefkkfffw9'at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)at java.lang.reflect.Constructor.newInstance(Unknown Source)at com.mysql.jdbc.Util.handleNewInstance(Util.java:404)at com.mysql.jdbc.Util.getInstance(Util.java:387)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:934)at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3966)at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3902)at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2526)at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2673)at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2549)at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1861)at com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2073)at com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2009)at com.mysql.jdbc.PreparedStatement.executeLargeUpdate(PreparedStatement.java:5098)at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1994)at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_executeUpdate(FilterChainImpl.java:2723)at com.alibaba.druid.filter.FilterAdapter.preparedStatement_executeUpdate(FilterAdapter.java:1069)at com.alibaba.druid.filter.FilterEventAdapter.preparedStatement_executeUpdate(FilterEventAdapter.java:491)at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_executeUpdate(FilterChainImpl.java:2721)at com.alibaba.druid.wall.WallFilter.preparedStatement_executeUpdate(WallFilter.java:633)at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_executeUpdate(FilterChainImpl.java:2721)at com.alibaba.druid.proxy.jdbc.PreparedStatementProxyImpl.executeUpdate(PreparedStatementProxyImpl.java:158)at com.alibaba.druid.pool.DruidPooledPreparedStatement.executeUpdate(DruidPooledPreparedStatement.java:253)at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:187)... 111 more

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