SQL，Hibernate（注释）：无法从表

时间：2015-09-08 10:39:16

标签： java mysql sql hibernate

我正在接受

  

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

尝试删除行时。

似乎我错误地映射了关系。

从顶部开始：

我必须要实体。电表和电力读数。

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

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：

@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}）”应该这样做，并允许我删除父行（米）并触发删除所有读数属于范围内的仪表，但它不会发生。 它反而给了我错误。

我应该如何正确映射实体，以便我能够删除父行以及同时删除孤立的行？

Stack在下面。不幸的是，我用波兰语写了这个程序，上面的课程已经在旅途中翻译过了。 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， 马切伊

1 个答案:

答案 0 :(得分：1)

CascadeType.ALL上的

ElectricityReading表示所有相关操作都是从读取到电表，而不是相反。因此，如果删除仪表，则不会发生级联。

要解决此问题，只需添加其他方向并添加级联，并将orphanRemoval = true属性添加到注释中。由于ElectricityReading仍然是关系的所有者，因此不需要对数据库进行任何更改。

如果您不想这样做，则必须先手动删除相应的读数。

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