SQL，休眠（注释）：无法从表中删除父行

【问题标题】：SQL, Hibernate (annotations): Unable to remove parent row from tableSQL，休眠（注释）：无法从表中删除父行
【发布时间】：2015-09-08 10:39:16
【问题描述】：

我收到了

java.sql.BatchUpdateException：无法删除或更新父行：a 外键约束失败

当试图删除一行时。

我似乎错误地映射了关系。

从顶部开始：

我必须实体。 ElectricityMeter 和 ElectricityReading。

由于我只想知道每个读数属于哪个仪表，因此我决定使用 ManyToOne 单向关系，如下所示：

阅读：

@Entity
@Table(name = "ELECTRICITY_READING")
public class ElectricityReading {

@Id
@GeneratedValue
@Column
private int id;
@ManyToOne(cascade={CascadeType.ALL})
ElectricityMeter meter;
//some other columns 

    public ElectricityMeter getMeter() {
        return meter;
    }

public void setMeter(ElectricityMeter meter) {
        this.meter = meter;
    }
//other getters setters etc.

仪表：

@Entity
@Table(name = "ELECTRICITY_METER")
public class ElectricityMeter extends {

@Id
@GeneratedValue
@Column
private int id;
@Column(nullable = false, unique = true)
private String serialNumber;
  //some other columns 


//getters setters etc.

据我所知，"@ManyToOne(cascade={CascadeType.ALL})" 应该可以解决问题，并允许我删除父行（仪表）并触发删除所有读数属于范围内的仪表但它不会发生。 它给了我错误。

我应该如何正确映射实体，以便能够同时删除父行以及孤立行？

堆栈在下面。不幸的是，我用波兰语编写了程序，上面的课程已经被翻译了。 堆栈中出现的单词：

odczyt-阅读；

licznik-meter;

能源-电力；

  exception

 org.springframework.web.util.NestedServletException: Request
 processing failed; nested exception is
 org.hibernate.exception.ConstraintViolationException: Could not
 execute JDBC batch update
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:659)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:552)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
 root cause

 org.hibernate.exception.ConstraintViolationException: Could not
 execute JDBC batch update
    org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:71)
    org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
    org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:253)
    org.hibernate.jdbc.AbstractBatcher.prepareStatement(AbstractBatcher.java:92)
    org.hibernate.jdbc.AbstractBatcher.prepareStatement(AbstractBatcher.java:87)
    org.hibernate.jdbc.AbstractBatcher.prepareBatchStatement(AbstractBatcher.java:222)
    org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2484)
    org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2702)
    org.hibernate.action.EntityDeleteAction.execute(EntityDeleteAction.java:77)
    org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279)
    org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:263)
    org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:172)
    org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:298)
    org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
    org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
    kamienica.dao.LicznikDaoImpl.deleteLicznik(LicznikDaoImpl.java:68)
    kamienica.service.LicznikServiceImpl.deleteLicznik(LicznikServiceImpl.java:58)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    java.lang.reflect.Method.invoke(Unknown Source)
    org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
    org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
    org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:108)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
    com.sun.proxy.$Proxy29.deleteLicznik(Unknown Source)
    kamienica.controller.LicznikController.usunLicznikEnergia(LicznikController.java:121)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    java.lang.reflect.Method.invoke(Unknown Source)
    org.springframework.web.bind.annotation.support.HandlerMethodInvoker.doInvokeMethod(HandlerMethodInvoker.java:710)
    org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:167)
    org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:414)
    org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:402)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:771)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:716)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:647)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:552)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
 root cause

 java.sql.BatchUpdateException: Cannot delete or update a parent row: a
 foreign key constraint fails (`kamienica`.`odczyt_energia`, CONSTRAINT
 `FK55CB21B13D42C17B` FOREIGN KEY (`licznik_licznik_id`) REFERENCES
 `licznik_energia` (`licznik_id`))
    com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:1213)
    com.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:912)
    org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:48)
    org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:246)
    org.hibernate.jdbc.AbstractBatcher.prepareStatement(AbstractBatcher.java:92)
    org.hibernate.jdbc.AbstractBatcher.prepareStatement(AbstractBatcher.java:87)
    org.hibernate.jdbc.AbstractBatcher.prepareBatchStatement(AbstractBatcher.java:222)
    org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2484)
    org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2702)
    org.hibernate.action.EntityDeleteAction.execute(EntityDeleteAction.java:77)
    org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279)
    org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:263)
    org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:172)
    org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:298)
    org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
    org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
    kamienica.dao.LicznikDaoImpl.deleteLicznik(LicznikDaoImpl.java:68)
    kamienica.service.LicznikServiceImpl.deleteLicznik(LicznikServiceImpl.java:58)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    java.lang.reflect.Method.invoke(Unknown Source)
    org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
    org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
    org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:108)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
    com.sun.proxy.$Proxy29.deleteLicznik(Unknown Source)
    kamienica.controller.LicznikController.usunLicznikEnergia(LicznikController.java:121)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    java.lang.reflect.Method.invoke(Unknown Source)
    org.springframework.web.bind.annotation.support.HandlerMethodInvoker.doInvokeMethod(HandlerMethodInvoker.java:710)
    org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:167)
    org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:414)
    org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:402)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:771)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:716)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:647)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:552)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)

感谢您的帮助， 马切耶

【问题讨论】：

  • 您不需要向我们展示整个堆栈跟踪。删除的代码在哪里？

标签： java mysql sql hibernate


【解决方案1】：

CascadeType.ALL on ElectricityReading 表示所有相关操作都从读数到仪表级联，而不是相反。因此，如果您删除一个仪表，则不会发生级联。

要解决这个问题，只需添加另一个方向级联并将orphanRemoval = true 属性添加到注释中。不需要对数据库进行任何更改，因为 ElectricityReading 仍然是关系的所有者。

如果您不想这样做，则必须先手动删除相应的读数。

【讨论】：

  • 我会试试的。谢谢。
猜你喜欢
  • 2017-04-03
  • 1970-01-01
  • 1970-01-01
  • 2023-04-06
  • 2012-05-13
  • 1970-01-01
  • 1970-01-01
  • 1970-01-01
  • 2014-03-17
相关资源
最近更新 更多
热门标签
Java Python linux javascript Mysql C# Docker 算法 前端 SpringBoot Redis Vue spring 设计模式 .net core .net kubernetes c++ 数据库 数据结构 大数据 js 机器学习 微服务 Android Go 程序员 面试 JVM ASP.net core 云原生 人工智能 后端 PHP git CSS golang k8s Nginx Django mybatis 深度学习 多线程 React 架构 devops 爬虫 云计算 Spring Boot LeetCode