Java 线程“main”org.hibernate.exception.ConstraintViolationException 中的异常：无法执行语句
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Exception in thread "main" org.hibernate.exception.ConstraintViolationException: could not execute statement
提问by gstackoverflow
What the reason of my mistake? I have to entities. Their relation is many to many.
我的错误的原因是什么？我要实体。他们的关系是多对多的。
prepod:
前脚架：
@Entity(name = "prepod")
public class Prepod {
private Long id;
List<Student> students = new ArrayList<Student>();
@ManyToMany
public List<Student> getStudents() {
return students;
}
public void setStudents(List<Student> students) {
this.students = students;
}
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id")
public Long getId() {
return id;
}
public void setId(Long i) {
id = i;
}
}
student:
学生：
@Entity
@Table(name="Student")
public class Student {
private Long id;
private String name;
private Long age;
private List<Prepod> prepods = new ArrayList<Prepod>();
@ManyToMany(mappedBy="students")
public List<Prepod> getPrepods() {
return prepods;
}
public void setPrepods(List<Prepod> prepods) {
this.prepods = prepods;
}
public Student(){
name = null;
}
public Student(Student s){
name = s.getName();
}
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY )
@Column (name = "id")
public Long getId() {
return id;
}
@Column(name="name")
public String getName(){
return name;
}
@Column(name="age")
public Long getAge(){
return age;
}
public void setId(Long i){
id = i;
}
public void setName(String s){
name = s;
}
public void setAge(Long age){
this.age = age;
}
}
invocation code:
调用代码：
public static void main(String[] args){
Prepod prepod = new Prepod();
prepod.setId(1l);
Student student = new Student();
student.setId(1l);
student.setName("qweqwe");
prepod.getStudents().add(student);
student.getPrepods().add(prepod);
Session session = HibernateUtil.getSessionFactory().openSession();
session.beginTransaction();
session.save(prepod);
session.save(student);
session.getTransaction().commit();
}
exception text:
异常文本：
Hibernate: insert into prepod default values
Exception in thread "main" org.hibernate.exception.ConstraintViolationException: could not execute statement
at org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.java:129)
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:110)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:136)
at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:96)
at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:58)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2975)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3487)
at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:81)
at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:364)
at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:205)
at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:185)
at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:169)
at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:321)
at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:286)
at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:192)
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:125)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:206)
at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:55)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:191)
at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:49)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)
at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:764)
at org.hibernate.internal.SessionImpl.save(SessionImpl.java:756)
at org.hibernate.internal.SessionImpl.save(SessionImpl.java:752)
at logic.Main.main(Main.java:17)
Tables create in databes, but data don't insert to my tables.
表在数据库中创建，但数据不会插入到我的表中。
Can you explain me what te reason?
你能解释一下是什么原因吗？
How to fix it?
如何解决？
UPDATE
更新
generated schema:
生成的架构：
回答by Sajan Chandran
One of your table has some constraint(e.g unique) which is preventing the insertquery to be executed.
Check your table constraints and modify your code.
您的一个表有一些constraint（例如唯一的）阻止执行insert查询。检查您的表约束并修改您的代码。
回答by user3093857
already table insert because of this resign constraintviolationexception EX: table is emp 1,ramesh,1000 2,vasu,3000 note 1,shekar,6000 this is the resign
由于此辞职约束violationexception已经表插入EX：表是emp 1,ramesh,1000 2,vasu,3000 note 1,shekar,6000 这是辞职
