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在数据库中有值，但是取出来后却为null 在线等！！！！



以上是问题的截图

下面是我的配置

TbUser.hbm.xml

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- 
    Mapping file autogenerated by MyEclipse Persistence Tools
-->
<hibernate-mapping>
    <class name="com.bbs.dao.TbUser" table="tb_user" catalog="db_medicalsystem">
        <id name="id" type="java.lang.Integer">
            <column name="ID" />
            <generator class="native" />
        </id>
        <property name="username" type="java.lang.String">
            <column name="username" length="20" not-null="true" />
        </property>
        <property name="password" type="java.lang.String">
            <column name="password" length="20" not-null="true" />
        </property>
        <property name="type" type="java.lang.String">
            <column name="type" length="2" not-null="true" />
        </property>
        <one-to-one name="tbAdmin" property-ref="tbUser" cascade="all"/>
        <one-to-one name="tbDoctor" property-ref="tbUser" cascade="all"/>
        <one-to-one name="tbPatient" property-ref="tbUser" cascade="all"/>
    </class>
</hibernate-mapping>


TbDoctor.hbm.xml

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- 
    Mapping file autogenerated by MyEclipse Persistence Tools
-->
<hibernate-mapping>
    <class name="com.bbs.dao.TbDoctor" table="tb_doctor" catalog="db_medicalsystem">
        <id name="id" type="java.lang.Integer">
            <column name="ID" />
            <generator class="native" />
        </id>
        <many-to-one name="tbDepartment" class="com.bbs.dao.TbDepartment" fetch="select">
            <column name="departmentname" />
        </many-to-one>
        <many-to-one name="tbUser" class="com.bbs.dao.TbUser" fetch="select" unique="true">
            <column name="Did" not-null="true" />
        </many-to-one>
        <property name="name" type="java.lang.String">
            <column name="name" length="20" not-null="true" />
        </property>
        <property name="sex" type="java.lang.String">
            <column name="sex" length="4" not-null="true" />
        </property>
        <property name="age" type="java.lang.Integer">
            <column name="age" not-null="true" />
        </property>
        <property name="post" type="java.lang.String">
            <column name="post" length="20" not-null="true" />
        </property>
        <property name="register" type="java.lang.String">
            <column name="register" length="20" />
        </property>
        <property name="contact1" type="java.lang.String">
            <column name="contact1" />
        </property>
        <property name="contact2" type="java.lang.String">
            <column name="contact2" />
        </property>
        <property name="contact3" type="java.lang.String">
            <column name="contact3" length="20" />
        </property>
        <set name="tbAnswers" inverse="true">
            <key>
                <column name="dID" not-null="true" />
            </key>
            <one-to-many class="com.bbs.dao.TbAnswer" />
        </set>
        <set name="tbRegisters" inverse="true">
            <key>
                <column name="dID" />
            </key>
            <one-to-many class="com.bbs.dao.TbRegister" />
        </set>
    </class>
</hibernate-mapping>


TbUser.java




package com.bbs.dao;



import java.util.HashSet;

import java.util.Set;



/**

 * TbUser entity. @author MyEclipse Persistence Tools

 */



public class TbUser implements java.io.Serializable {



	// Fields



	private Integer id;

	private String username;

	private String password;

	private String type;

	private TbAdmin tbAdmin;

	private TbDoctor tbDoctor;

	private TbPatient tbPatient;



	

	// Constructors



	/** default constructor */

	public TbUser() {

	}



	/** minimal constructor */

	public TbUser(String username, String password, String type) {

		this.username = username;

		this.password = password;

		this.type = type;

	}



	/** full constructor */

	public TbUser(String username, String password, String type, TbAdmin tbAdmin,

			TbDoctor tbDoctor,TbPatient tbPatient) {

		this.username = username;

		this.password = password;

		this.type = type;

		this.tbDoctor = tbDoctor;

		this.tbPatient = tbPatient;

		this.tbAdmin = tbAdmin;

	}



	// Property accessors



	public Integer getId() {

		return this.id;

	}



	public void setId(Integer id) {

		this.id = id;

	}



	public String getUsername() {

		return this.username;

	}



	public void setUsername(String username) {

		this.username = username;

	}



	public String getPassword() {

		return this.password;

	}



	public void setPassword(String password) {

		this.password = password;

	}



	public String getType() {

		return this.type;

	}



	public void setType(String type) {

		this.type = type;

	}



	public TbDoctor getTbDoctor() {

		return this.tbDoctor;

	}



	public void setTbDoctor(TbDoctor tbDoctor) {

		this.tbDoctor = tbDoctor;

	}



	public TbPatient getTbPatient() {

		return this.tbPatient;

	}



	public void setTbPatient(TbPatient tbPatient) {

		this.tbPatient = tbPatient;

	}



	public TbAdmin getTbAdmin() {

		return this.tbAdmin;

	}



	public void setTbAdmin(TbAdmin tbAdmin) {

		this.tbAdmin = tbAdmin;

	}



}


TbDoctor.java

package com.bbs.dao;



import java.util.HashSet;

import java.util.Set;



/**

 * TbDoctor entity. @author MyEclipse Persistence Tools

 */



public class TbDoctor implements java.io.Serializable {



	// Fields



	private Integer id;

	private TbDepartment tbDepartment;

	private TbUser tbUser;

	private Integer Did;

	private String name;

	private String sex;

	private Integer age;

	private String post;

	private String register;

	private String contact1;

	private String contact2;

	private String contact3;

	private Set tbAnswers = new HashSet(0);

	private Set tbRegisters = new HashSet(0);



	// Constructors



	/** default constructor */

	public TbDoctor() {

	}



	/** minimal constructor */

	public TbDoctor(TbUser tbUser, String name, String sex, Integer age,

			String post) {

		this.tbUser = tbUser;

		this.name = name;

		this.sex = sex;

		this.age = age;

		this.post = post;

	}



	/** full constructor */

	public TbDoctor(TbDepartment tbDepartment, TbUser tbUser, String name,

			String sex, Integer age, String post, String register,

			String contact1, String contact2, String contact3, Set tbAnswers,

			Set tbRegisters) {

		this.tbDepartment = tbDepartment;

		this.tbUser = tbUser;

		this.name = name;

		this.sex = sex;

		this.age = age;

		this.post = post;

		this.register = register;

		this.contact1 = contact1;

		this.contact2 = contact2;

		this.contact3 = contact3;

		this.tbAnswers = tbAnswers;

		this.tbRegisters = tbRegisters;

	}



	// Property accessors



	public Integer getId() {

		return this.id;

	}



	public void setId(Integer id) {

		this.id = id;

	}



	public TbDepartment getTbDepartment() {

		return this.tbDepartment;

	}



	public void setTbDepartment(TbDepartment tbDepartment) {

		this.tbDepartment = tbDepartment;

	}



	public TbUser getTbUser() {

		return this.tbUser;

	}



	public void setTbUser(TbUser tbUser) {

		this.tbUser = tbUser;

	}

	

	public Integer getDid(){

		return this.Did;

	}

	public void setDid(Integer Did){

		this.Did = Did;

	}



	public String getName() {

		return this.name;

	}



	public void setName(String name) {

		this.name = name;

	}



	public String getSex() {

		return this.sex;

	}



	public void setSex(String sex) {

		this.sex = sex;

	}



	public Integer getAge() {

		return this.age;

	}



	public void setAge(Integer age) {

		this.age = age;

	}



	public String getPost() {

		return this.post;

	}



	public void setPost(String post) {

		this.post = post;

	}



	public String getRegister() {

		return this.register;

	}



	public void setRegister(String register) {

		this.register = register;

	}



	public String getContact1() {

		return this.contact1;

	}



	public void setContact1(String contact1) {

		this.contact1 = contact1;

	}



	public String getContact2() {

		return this.contact2;

	}



	public void setContact2(String contact2) {

		this.contact2 = contact2;

	}



	public String getContact3() {

		return this.contact3;

	}



	public void setContact3(String contact3) {

		this.contact3 = contact3;

	}



	public Set getTbAnswers() {

		return this.tbAnswers;

	}



	public void setTbAnswers(Set tbAnswers) {

		this.tbAnswers = tbAnswers;

	}



	public Set getTbRegisters() {

		return this.tbRegisters;

	}



	public void setTbRegisters(Set tbRegisters) {

		this.tbRegisters = tbRegisters;

	}



}
SSH2 Java MySQL Hibernate Null --------------------编程问答-------------------- 结果帖出来啊。。。。。。 --------------------编程问答--------------------
引用 1 楼 hjw506848887 的回复:
结果帖出来啊。。。。。。


结果是在另一个关联中存储报错

HTTP Status 500 - could not insert: [com.bbs.dao.TbAnswer]; SQL [insert into db_medicalsystem.tb_answer (questionID, dID, content) values (?, ?, ?)]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: could not insert: [com.bbs.dao.TbAnswer]

--------------------------------------------------------------------------------

type Exception report

message could not insert: [com.bbs.dao.TbAnswer]; SQL [insert into db_medicalsystem.tb_answer (questionID, dID, content) values (?, ?, ?)]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: could not insert: [com.bbs.dao.TbAnswer]

description The server encountered an internal error that prevented it from fulfilling this request.

exception 

org.springframework.dao.DataIntegrityViolationException: could not insert: [com.bbs.dao.TbAnswer]; SQL [insert into db_medicalsystem.tb_answer (questionID, dID, content) values (?, ?, ?)]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: could not insert: [com.bbs.dao.TbAnswer]
org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:637)
org.springframework.orm.hibernate3.HibernateAccessor.convertHibernateAccessException(HibernateAccessor.java:412)
org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:411)
org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:374)
org.springframework.orm.hibernate3.HibernateTemplate.save(HibernateTemplate.java:683)
com.bbs.dao.impl.TbAnswerDAO.save(TbAnswerDAO.java:42)
com.bbs.Service.impl.DoctorService.addAnsToQue(DoctorService.java:148)
com.bbs.controller.doctor.DoctorDo.addAnswer(DoctorDo.java:57)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:601)
com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:452)
com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:291)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:254)
com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263)
org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:133)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:142)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:166)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:190)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:485)
org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
--------------------编程问答-------------------- org.hibernate.exception.ConstraintViolationException: could not insert: [com.bbs.dao.TbAnswer]
org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:94)
org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:64)
org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2176)
org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2656)
org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:71)
org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279)
org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:321)
org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:204)
org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:130)
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210)
org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:56)
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195)
org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:50)
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)
org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:563)
org.hibernate.impl.SessionImpl.save(SessionImpl.java:551)
org.hibernate.impl.SessionImpl.save(SessionImpl.java:547)
org.springframework.orm.hibernate3.HibernateTemplate$12.doInHibernate(HibernateTemplate.java:686)
org.springframework.orm.hibernate3.HibernateTemplate$12.doInHibernate(HibernateTemplate.java:1)
org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:406)
org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:374)
org.springframework.orm.hibernate3.HibernateTemplate.save(HibernateTemplate.java:683)
com.bbs.dao.impl.TbAnswerDAO.save(TbAnswerDAO.java:42)
com.bbs.Service.impl.DoctorService.addAnsToQue(DoctorService.java:148)
com.bbs.controller.doctor.DoctorDo.addAnswer(DoctorDo.java:57)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:601)
com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:452)
com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:291)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:254)
com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263)
org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:133)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:142)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:166)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:190)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:485)
org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
--------------------编程问答-------------------- com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot add or update a child row: a foreign key constraint fails (`db_medicalsystem`.`tb_answer`, CONSTRAINT `answer_ibfk_1` FOREIGN KEY (`dID`) REFERENCES `tb_doctor` (`Did`) ON DELETE CASCADE ON UPDATE CASCADE)
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
java.lang.reflect.Constructor.newInstance(Constructor.java:525)
com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
com.mysql.jdbc.Util.getInstance(Util.java:386)
com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1040)
com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4120)
com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4052)
com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2503)
com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2664)
com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2794)
com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2155)
com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2458)
com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2375)
com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2359)
org.apache.commons.dbcp.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:102)
org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:94)
org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:57)
org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2176)
org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2656)
org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:71)
org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279)
org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:321)
org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:204)
org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:130)
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210)
org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:56)
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195)
org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:50)
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)
org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:563)
org.hibernate.impl.SessionImpl.save(SessionImpl.java:551)
org.hibernate.impl.SessionImpl.save(SessionImpl.java:547)
org.springframework.orm.hibernate3.HibernateTemplate$12.doInHibernate(HibernateTemplate.java:686)
org.springframework.orm.hibernate3.HibernateTemplate$12.doInHibernate(HibernateTemplate.java:1)
org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:406)
org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:374)
org.springframework.orm.hibernate3.HibernateTemplate.save(HibernateTemplate.java:683)
com.bbs.dao.impl.TbAnswerDAO.save(TbAnswerDAO.java:42)
com.bbs.Service.impl.DoctorService.addAnsToQue(DoctorService.java:148)
com.bbs.controller.doctor.DoctorDo.addAnswer(DoctorDo.java:57)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:601)
com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:452)
com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:291)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:254)
com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263)
org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:133)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:142)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:166)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:190)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:485)
org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
--------------------编程问答-------------------- 怎么没看到你的TbAnswer类和其hbm映射啊？？？ --------------------编程问答-------------------- TbDoctor类的Did属性命名不规范，应该是did，首字母要小写。 
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