由com.sybase.jdbc2.jdbc.SybSQLException引起：表test中的列detail_id不允许空值 [英] Caused by: com.sybase.jdbc2.jdbc.SybSQLException: The column detail_id in table exam does not allow null values

问题描述

我有两个表，我试图用Hibernate建立1对1映射。

ExamDetail.java

  package com.hibernate.mapping; 
 
 import javax.persistence.Column; 
 import javax.persistence.Entity; 
 import javax.persistence.GeneratedValue; 
 import javax.persistence.Id; 
 import javax.persistence.Table; 
 
 @Entity 
 @Table（name =exam_detail）
公共类ExamDetail {
 
 private int id; 
私人字符串fullName; 
 private int numberOfQuestions; 
 private int passingPercentage; 
 
 @Id 
 @GeneratedValue 
 @Column（name =id）
 public int getId（）{
 return id; 
} 
 public void setId（int id）{
 this.id = id; 
} 
 public String getFullName（）{
 return fullName; 
} 
 public void setFullName（String fullName）{
 this.fullName = fullName; 
} 
 public int getNumberOfQuestions（）{
 return numberOfQuestions; 
} 
 public void setNumberOfQuestions（int numberOfQuestions）{
 this.numberOfQuestions = numberOfQuestions; 
} 
 public int getPassingPercentage（）{
 return passingPercentage; 
} 
 public void setPassingPercentage（int passingPercentage）{
 this.passingPercentage = passingPercentage; 
} 
} 
  

Exam.java

  package com.hibernate.mapping; 
 
 import javax.persistence.CascadeType; 
 import javax.persistence.Column; 
 import javax.persistence.Entity; 
 import javax.persistence.GeneratedValue; 
 import javax.persistence.Id; 
 import javax.persistence.JoinColumn; 
 import javax.persistence.OneToOne; 
 import javax.persistence.Table; 
 
 @Entity 
 @Table（name =exam）
公开课考试{
 
 private int id; 
 private String shortName; 
私人ExamDetail细节; 
 
 @Id 
 @GeneratedValue 
 @Column（name =id）
 public int getId（）{
 return id; 
} 
 public void setId（int id）{
 this.id = id; 
} 
 public String getShortName（）{
 return shortName; 
} 
 public void setShortName（String shortName）{
 this.shortName = shortName; 
 $ 
 $ b @OneToOne（cascade = CascadeType.PERSIST）
 @JoinColumn（name =detail_id）
 public ExamDetail getDetail（）{
 return详情; 
} 
 public void setDetail（ExamDetail detail）{
 this.detail = detail; 
} 
} 
  

TestMapping.java

  package com.hibernate.mapping; 
 
 import org.hibernate.Session; 
 
 import com.hibernate.util.HibernateUtil; 
 
 public class TestMapping {
 
 public static void main（String [] args）{
 Session session = HibernateUtil.beginTransaction（）; 
 
考试考试=新考试（）; 
 exam.setShortName（SCJA）; 
 
 ExamDetail detail = new ExamDetail（）; 
 detail.setFullName（Sun Certified Associate）; 
 detail.setNumberOfQuestions（50）; 
 detail.setPassingPercentage（60）; 
 
 exam.setDetail（detail）; 
 
 session.save（考试）; 
 HibernateUtil.commitTransaction（）; 
} 
} 
  

当我运行此代码时，遇到以下异常： -

线程main中的异常
org.hibernate.exception.ConstraintViolationException：不能
插入：[com.hibernate.mapping.Exam] at
org.hibernate.exception.SQLStateConverter.convert（SQLStateConverter.java:94）
at
org.hibernate.exception .JDBCExceptionHelper.convert（JDBCExceptionHelper.java:66）
。在
org.hibernate.id.insert.AbstractReturningDelegate.performInsert（AbstractReturningDelegate.java:64）
。在
org.hibernate作为.persister.entity.AbstractEntityPersister.insert（AbstractEntityPersister.java:2186）
。在
org.hibernate.persister.entity.AbstractEntityPersister.insert（AbstractEntityPersister.java:2666）
。在
org.hibernate.engine.ActionQueu上的
org.hibernate.action.EntityIdentityInsertAction.execute（EntityIdentityInsertAction.java:71）
处的eexecute（ActionQueue.java:279）org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate（AbstractSaveEventListener.java:321）
at
org.hibernate.event.def。 AbstractSaveEventListener.performSave（AbstractSaveEventListener.java:204）
。在
org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId（AbstractSaveEventListener.java:130）
。在
org.hibernate作为。
at
org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId（DefaultSaveEventListener.java:56）
at
（$）
at
org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId（DefaultSaveEventListener.java:56）
at
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient（DefaultSaveOrUpdateEventListener.java:195）
。在
org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate（DefaultSaveEventListener.java:50）
。在
org.hibernate.event.def.DefaultSaveOrUpdateE ventListener.onSaveOrUpdate（DefaultSaveOrUpdateEventListener.java:93）
在org.hibernate.impl.SessionImpl.fireSave（SessionImpl.java:562）在
org.hibernate.impl.SessionImpl.save（SessionImpl.java： 550）at
org.hibernate.impl.SessionImpl.save（SessionImpl.java:546）at
sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method）at
sun.reflect.NativeMethodAccessorImpl。在
处调用（未知源）在
处的sun.reflect.DelegatingMethodAccessorImpl.invoke（未知源）在
处的java.lang.reflect.Method.invoke（未知源）org.hibernate.context。 ThreadLocalSessionContext $ TransactionProtectionWrapper.invoke（ThreadLocalSessionContext.java:342）
at $ Proxy14.save（Unknown Source）at
com.hibernate.mapping.TestMapping.main（TestMapping.java:22）引起：
com.sybase.jdbc2.jdbc.SybSQLException：表
考试中的列detail_id不允许为空值。

在com.sybase.jdbc 2.tds.Tds.processEed（Tds.java:2535）at
com.sybase.jdbc2.tds.Tds.nextResult（Tds.java:1916）at
com.sybase.jdbc2.jdbc。 ResultGetter.nextResult（ResultGetter.java:69）
at
com.sybase.jdbc2.jdbc.SybStatement.nextResult（SybStatement.java:201）
at
com.sybase。 jdbc2.jdbc.SybStatement.nextResult（SybStatement.java:182）
at
com.sybase.jdbc2.jdbc.SybStatement.executeLoop（SybStatement.java:1596）
at com.sybase。 jdbc2.jdbc.SybStatement.execute（SybStatement.java:1588）
at
com.sybase.jdbc2.jdbc.SybPreparedStatement.execute（SybPreparedStatement.java:580）
at
org.hibernate.id.IdentityGenerator $ InsertSelectDelegate.executeAndExtract（IdentityGenerator.java:138）在
org.hibernate.id.insert.AbstractReturningDelegate.performInsert（AbstractReturningDelegate.java:57）

。 .. 22更多

我做错了什么？

任何缺失的语句？

解决方案

在JPA。

这里：参考

JPA示例

ID生成

I have two tables between which I am trying to establish a 1-to-1 mapping using Hibernate.

ExamDetail.java

package com.hibernate.mapping;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="exam_detail")
public class ExamDetail {

    private int id;
    private String fullName;
    private int numberOfQuestions;
    private int passingPercentage;

    @Id
    @GeneratedValue
    @Column(name="id")
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getFullName() {
        return fullName;
    }
    public void setFullName(String fullName) {
        this.fullName = fullName;
    }
    public int getNumberOfQuestions() {
        return numberOfQuestions;
    }
    public void setNumberOfQuestions(int numberOfQuestions) {
        this.numberOfQuestions = numberOfQuestions;
    }
    public int getPassingPercentage() {
        return passingPercentage;
    }
    public void setPassingPercentage(int passingPercentage) {
        this.passingPercentage = passingPercentage;
    }
}

Exam.java

package com.hibernate.mapping;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
import javax.persistence.Table;

@Entity
@Table(name="exam")
public class Exam {

    private int id;
    private String shortName;
    private ExamDetail detail;

    @Id
    @GeneratedValue
    @Column(name="id")
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getShortName() {
        return shortName;
    }
    public void setShortName(String shortName) {
        this.shortName = shortName;
    }

    @OneToOne(cascade=CascadeType.PERSIST)
    @JoinColumn(name="detail_id")
    public ExamDetail getDetail() {
        return detail;
    }
    public void setDetail(ExamDetail detail) {
        this.detail = detail;
    }
}

TestMapping.java

package com.hibernate.mapping;

import org.hibernate.Session;

import com.hibernate.util.HibernateUtil;

public class TestMapping {

    public static void main(String[] args) {
        Session session = HibernateUtil.beginTransaction();

        Exam exam = new Exam();
        exam.setShortName("SCJA");

        ExamDetail detail = new ExamDetail();
        detail.setFullName("Sun Certified Associate");
        detail.setNumberOfQuestions(50);
        detail.setPassingPercentage(60);

        exam.setDetail(detail);

        session.save(exam);
        HibernateUtil.commitTransaction();
    }
}

When I ran this code, I encounter following exception :-

Exception in thread "main" org.hibernate.exception.ConstraintViolationException: could not insert: [com.hibernate.mapping.Exam] at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:94) 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:2186) at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2666) at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:71) at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279) at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:321) at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:204) at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:130) at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210) at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:56) at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195) at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:50) at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93) at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:562) at org.hibernate.impl.SessionImpl.save(SessionImpl.java:550) at org.hibernate.impl.SessionImpl.save(SessionImpl.java:546) 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.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:342) at $Proxy14.save(Unknown Source) at com.hibernate.mapping.TestMapping.main(TestMapping.java:22) Caused by: com.sybase.jdbc2.jdbc.SybSQLException: The column detail_id in table exam does not allow null values.

at com.sybase.jdbc2.tds.Tds.processEed(Tds.java:2535) at com.sybase.jdbc2.tds.Tds.nextResult(Tds.java:1916) at com.sybase.jdbc2.jdbc.ResultGetter.nextResult(ResultGetter.java:69) at com.sybase.jdbc2.jdbc.SybStatement.nextResult(SybStatement.java:201) at com.sybase.jdbc2.jdbc.SybStatement.nextResult(SybStatement.java:182) at com.sybase.jdbc2.jdbc.SybStatement.executeLoop(SybStatement.java:1596) at com.sybase.jdbc2.jdbc.SybStatement.execute(SybStatement.java:1588) at com.sybase.jdbc2.jdbc.SybPreparedStatement.execute(SybPreparedStatement.java:580) at org.hibernate.id.IdentityGenerator$InsertSelectDelegate.executeAndExtract(IdentityGenerator.java:138) at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:57) ... 22 more

What am I doing wrong ?

Any missing statement ?

解决方案

You need to reference ID generation in JPA.

Here : reference

JPA Example

ID Generation

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